JPH0321652A - Ultra-high molecule polyolefin composition - Google Patents

Abstract

PURPOSE:To obtain the subject ultra-high molecule polyolefin composition excellent in heat stability during molding processes, long-term heat stability and weather resistance while maintaining tensile strength, etc., by blending an organic phosphite-based stabilizer and a hindered amine-based stabilizer respectively in a specified amount. CONSTITUTION:With (A) 3-80wt.% ultra-high molecule polyolefin having 5-40dl/g intrinsic viscosity in decalin solvent at 135 deg.C, (B) 97-20wt.% diluent (e.g. n- nonane) is mixed. With 100 pts.wt. of the resultant mixture, (C) 0.005-5 pts. wt., preferably 0.05-0.2 pts.wt. organic phosphite-based stabilizer (e.g. trioctyl phosphite), (D) 0.005-5 pts. wt., preferably 0.05-0.2 pts. wt. hindered amine-based stabilizer [e.g. bis(2,2,6,6-tetramethyl-4piperidyl)sebacate] and, as necessary, (E) 0.005-5 pts.wt., preferably 0.05-0.5 pts.wt. metal salt of a higher fatty acid (e.g. magnesium stearate) are blended.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an ultra-high molecular weight polyolefin composite suitable for obtaining a molecularly oriented molded article, and more particularly, to thermal stability during shaping and long-term heat resistance stability. The present invention also relates to an ultra-high molecular weight polyolefin composition for molding molecularly oriented or shaped bodies with excellent weather resistance.

Technical background of the invention and its problems It is already known that a molecularly oriented molded article having high tensile strength and high tensile control ratio can be obtained by forming an ultra-high molecular weight polyolefin into a fiber, tape, etc. and then stretching it. It becomes. For example, JP-A-56-15408 discloses a method of spinning a dilute solution of ultra-high molecular weight polyethylene and then drawing the resulting filament.

Further, JP-A-59-130313 discloses a method of melting and kneading ultra-high molecular weight polyethylene and wax, extruding the mixed wire material, and then cooling and solidifying the mixed wire material before stretching. Furthermore, JP-A-59-187614
The publication discloses a method in which the molten mixture is extruded and then passed through a draft, and then the molten mixture is cooled, solidified, and stretched.

In this way, fibers using ultra-high molecular weight polyolefins,
When shaping a molecularly oriented molded product such as a tape, a dilute solution of ultra-high molecular weight polyolefin is spun and the resulting filament is drawn, or a mixture of ultra-high molecular weight polyolefin and a diluent such as wax is spun. It is necessary to perform operations such as immediately discharging the kneaded material after melt-kneading, and then cooling and solidifying the mixed wire material and stretching it. During such operations, ultra-high molecular weight polyolefins are subject to thermal deterioration due to being held in high-temperature dilute solutions for long periods of time, or being expelled in high-temperature extruders, resulting in thermal deterioration. Because of the poor thermal stability at the time, the resulting molecularly oriented molded product did not always have sufficient tensile strength, tensile modulus, etc.

Furthermore, the above-mentioned ultra-high molecular weight polyolefin compositions all have a problem in that they are inferior not only in thermal stability during shaping, but also in long-term thermal stability and weather resistance.

Purpose of the Invention The present invention aims to resolve the above-mentioned problems, and to develop a method for molecular orientation that does not impair the tensile strength, tensile modulus, etc. inherent to ultra-high molecular weight polyolefins. The object of the present invention is to provide an ultra-high molecular weight polyolefin composition that has excellent thermal stability during molding, long-term thermal stability, and weather resistance suitable for obtaining a shape.

Summary of the Invention The first ultra-high molecular weight polyolefin composition according to the present invention has (A) an intrinsic viscosity [η
] is 5 to 40dj7/g: 3 to 80% by weight, and (B) diluent 297
~20% by weight, (C) Organophosphite stabilizer = 0.005 to 5 parts by weight based on 100 parts by weight of the total weight of (A) ultra-high molecular weight polyolefin and (B) diluent, (D) Hindered amine stabilizer: total weight of (A) tH high molecular weight polyolefin and (B) diluent ffi10
It is characterized in that it consists of 0.005 to 0.005 parts by weight to 0 parts by weight.

Further, the second ultra-high molecular weight polyolefin composition according to the present invention has the following characteristics: (A) ultimate dryness [η
] is 5 to 406 g/g = 3 to 80% by weight, and (B) diluent: 97 to 20% by weight
and (C) organic phosphite stabilizer = 0.005 to 5 parts by weight based on 100 parts by weight of the total weight of (A) ultra-high molecular weight polyolefin and (B) diluent; CD) hindered amine stabilizer: Total of (A) ultra-high molecular weight polyolefin and (B) diluent IILIOO
0.005 to 5 parts by weight per part by weight, and (E) metal salt of higher fatty acid: 0.005 to 5 parts by weight per 100 parts by weight of the total weight of (A) Ell high molecular weight polyolefin and (B) diluent. 5 parts by weight.

DETAILED DESCRIPTION OF THE INVENTION The ultra-high molecular weight polyolefin composition according to the present invention will be specifically described below.

Ultra-high molecular weight polyolefin (A) Intrinsic viscosity [η] of the ultra-high molecular weight polyolefin (A) used in the present invention as determined by δP1 in a decalin solvent at 135°C
is at least 5 dN/g, preferably 5 to 40 dll
/g. When an ultra-high molecular weight polyolefin having an intrinsic viscosity [η] within the above range is used, not only a molecularly oriented or shaped body having sufficient tensile strength can be obtained, but also the molecularly oriented or shaped body can be easily molded.

The ultra-high molecular weight polyolefins (A) as described above include, for example, ethylene, brobylene, l-butene, 1-pentene, l-hexene, 1-octene, 1-decene, i-dodecene, 4-methyl-1-pentene, It consists of a homopolymer or copolymer of α-olefin such as 3-methyl-1-pentene. Among these, ethylene homopolymers or copolymers of ethylene and other α-olefins, with ethylene as the main component, are particularly preferred.

In the ultra-high molecular weight polyolefin composition according to the present invention, the ultra-high molecular weight polyolefin and the diluent (B) described below are such that the ultra-high molecular weight polyolefin (A) has a proportion of both (A) and (B). It is present in a proportion of 3 to 80% by weight based on the total weight. The ultra-high molecular weight polyolefin as described above is preferably present in a proportion of 15 to 60% by weight based on the total weight of component (A) and component (B). When ultra-high molecular weight polyolefin (A) is used in an amount within the above range, melt mixing and melt molding are easy, the molded product has excellent stretchability, and it prevents roughening of the surface of the shaped product, stretching breakage, etc. be able to.

Diluent (B) The ultra-high molecular weight polyolefin composition according to the present invention contains a diluent (B) in addition to the above-mentioned ultra-high molecular weight polyolefin (A).

As the diluent, a solvent for ultra-high molecular weight polyolefin or various waxes having dispersibility for ultra-high molecular weight polyolefin are used.

The solvent used as the diluent (B) in the present invention is preferably a solvent having a boiling point higher than the melting point of the ultra-high molecular weight polyolefin, more preferably higher than the melting point +20°C.

Specifically, such solvents include n-nonane, n-nonane, and n-nonane.
-dodecane, n-undecane, n-tetradecane, n-
Octadecane or liquid paraffin, aliphatic hydrocarbon solvents such as kerosene, xylene, naphthalene, tetralin,
Aromatic hydrocarbon solvents such as butylbenzene, p-cymene, cyclohexylbenzene, diethylbenzene, benzylbenzene, dodecylbenzene, bicyclohexyl, decalin, methylnaphthalene, ethylnaphthalene or their hydrogenated derivatives, LL, 2,2-tetra Chloroethane, pentachloroethane, hexachloroethane, 1,2.
3-trichloropropane, dichlorobenzene, 1,2.
Examples include halogenated hydrocarbon solvents such as 4-trichlorobenzene and bromobenzene, mineral oils such as paraffinic process oils, naphthenic process oils, and aromatic process oils.

Further, as the wax used as the diluent (B) in the present invention, an aliphatic hydrocarbon compound or a derivative thereof is used.

The aliphatic hydrocarbon compound is a paraffin wax mainly composed of a saturated aliphatic hydrocarbon compound, and usually has a molecular weight of 2,000 or less, preferably 1,000 or less, and more preferably 800 or less. Specifically, the following aliphatic hydrocarbon compounds are used.

N-alkanes with 22 or more carbon atoms such as docosane, tricosane, tetracosane, triacontane, or mixtures of these with lower n-alkanes, so-called paraffin wax separated and refined from petroleum, ethylene or ethylene and others Polyethylene such as medium/low pressure polyethylene wax, high pressure polyethylene wax, ethylene copolymer wax, medium/low pressure polyethylene, high pressure polyethylene, etc., which are low molecular weight FFI polymers obtained by copolymerizing α-olefin with α-olefin, is heat-reduced. Waxes whose molecular weight has been lowered by such methods as waxes, oxides of these waxes, oxidized waxes modified with maleic acid, waxes modified with maleic acid, etc.

Examples of aliphatic hydrocarbon compound derivatives include one or more, preferably one to two, particularly preferably one, carboxyl group or hydroxyl group at the terminal or inside of an aliphatic hydrocarbon group (alkyl group, alkenyl group). , a compound having a functional group such as a carbamoyl group, an ester group, a mercapto group, or a carbonyl group with a carbon number of 8 or more, preferably a carbon number of 12 to 50 or a molecular ffi of 130 to 2,000
, preferably 200 to 800 fatty acids, aliphatic alcohols, fatty acid amides, fatty acid esters, aliphatic mercabutanes, aliphatic aldehydes, aliphatic ketones, etc. are used. Specifically, the following compounds are used.

Fatty acids such as cabric acid, lauric acid, myristic acid, valmitic acid, stearic acid, and oleic acid; aliphatic alcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol, and stearyl alcohol; caprinamide, lauramide, palmitinamide, stearylamide, etc. fatty acid amides, fatty acid esters such as stearyl acetate, etc.

In the ultra-high molecular weight polyolefin composition according to the present invention, the ultra-high molecular weight polyolefin and the diluent (B) are such that the diluent (B) is based on the total weight of both components (A) and (B). It is present in a proportion of 97 to 20% by weight. The diluent (B) as described above is preferably present in a proportion of 85 to 40% by weight based on the total weight of component (A) and component (B). Diluent (
When B) is used in an amount within the above-mentioned range, melt mixing and melt molding are easy, the shape product has excellent stretchability, and it is possible to prevent surface roughness, stretch breakage, etc. of the shape product.

Organic phosphite stabilizer (C) The ultra-high molecular weight polyolefin composition according to the present invention contains an organic phosphite stabilizer (C) in addition to the ultra-high molecular weight polyolefin (A) and diluent (B) as described above. ).

As the organic phosphite stabilizer, conventionally known stabilizers can be used without particular limitation, and specifically, the following compounds are used.

Trioctyl phosphite, trilauryl phosphite, tridecyl phosphite, octyl diphenyl phosphite, tris(2,4-di-t-butylphenyl)
Phosphite, triphenyl phosphite, tris(butoxyethyl) phosphite, tris(nonylphenyl) phosphite, distearylbentaerythritol diphosphite, tetra(tridecyl) -1.1.3-
Tris(2-methyl-5-t-butyl-4-hydroxyphenyl)butane diphosphite, tetra(Ct2~
Cl5 mixed alkyl)-4,4°-isobropylidene diphenyl diphosphite, tetra(tridecyl)-4.
4'-Butylidenebis(3-methyl-6-t-butylphenol) diphosphite, tris(3,5-di-t-
Butyl-4-hydroxyphenyl) phosphite, tris(mono-dimixed nonylphenyl) phosphite, hydrogenated-4.4°-isopropylidene diphenol polyphosphite, bis(octylphenyl)●bis[4.4 '
-butylidenebis(3-methyl-6-t-butylphenol)] 1,6-hexanediol diphosphite,
Phenyl◆4.4゜-isobropylidene diphenol・
Pentaerythritol diphosphite, Tris [4.4
“-isopropylidene bis(2-t-butylphenol)] phosphite, phenyl diisodecyl phosphite, di(nonylphenyl) pentaerythritol diphosphite, tris(1,3-distearyloxyisopropyl) phosphite , 4.4゜-isobropylidene bis(2-t-butylphenol)●di(nonylphenyl)phosphite, 9.10-dihydro~9-oxer9-oxerlO-phosphaphenanthrene-IO
- Examples include oxides.

Also, bis(dialkyl phenyl) pentaerythri i・-
As the phosphite ester, a subiro type represented by the following formula (1) or a cage type represented by the formula (2>) are also used.Usually, economical For reasons mixtures of both isomers are most often used.

Here, R R2 is preferably an alkyl group having from i to 9 carbon atoms, particularly a branched alkyl group, especially a tert-butyl group, and the substitution positions in the phenyl group are most preferably at the 2 and 4.8 positions. preferable. A preferred phosphite ester is bis(2,4-di-t-butylphenyl)
Pentaerythritol diphosphite, bis(2,6-
di-t-butyl-4-methylphenyl) pentaerythritol diphosphite, and also phosphonite with a structure in which carbon and phosphorus are directly bonded, such as tetrakis(2.4-di-t-butylphenyl)-4.4゜-・Compounds such as biphenylene diphosphonite may also be mentioned.

These organic phosphite stabilizers may be used alone or in combination.

In the ultra-high molecular weight polyolefin↑1l composition according to the present invention, the organic phosphite stabilizer (C) as described above is added to 100 parts by weight of the total weight of the ultra-high molecular weight polyolefin (A) and the diluent (B). 0.005 to 5 parts by weight, preferably 0.01 to 0.5 parts by weight, more preferably 0.01 to 0.5 parts by weight.
It is used in an amount of 0.05 to 0.2 parts by weight. When this organic phosphite stabilizer (C) is used in an amount within the above range, it is possible to enhance the effect of improving heat resistance, and it is also economically advantageous, and it also improves the properties of the resin, such as strength. , without impairing elongation.

Hindered Amine Stabilizer (D) The ultra-high molecular weight polyolefin composition according to the present invention comprises the above-mentioned ultra-high molecular weight polyolefin (A) diluent (B).
In addition to the organic phosphite stabilizer (C), it contains a hindered amine stabilizer (D).

As the hindered amine stabilizer, conventionally known compounds having a structure in which all the hydrogens bonded to carbons at the 2- and 6-positions of piperidine are replaced with methyl groups can be used, but there are specific examples. Specifically, the following compounds are used.

(1) Bis(2,2,8.6-tetramethyl-4-piperidyl) sebacate, (2) Dimethyl succinate-1-(2-hydroxyethyl)-4-hydroxy-2.2,6.8- Te1-ramethylpiperidine polycondensate, (3) poly[[6-(1.1,3.3-tetramethylbutyl)imino 1.3.5-triazine-2-4-diyl J[(2, 2,6,6-tetramethyl-4-piperidyl)imino]hexamethylene [(2.2.6.8-tetramethyl-4-piperidyl)imino]], (4) Tetrakis (2.2.6.6 -tetramethyl-
(4-biperidyl)-1.2.3.4-butanetetracarpoxylate, (5) 2,2.8.6-tetramethyl-4-piperidinylbenzoate, (6) bis-(1,2, 13.6-pentamethyl-4-
piperidinyl)-2-(3,5-di-t-butyl-4-
(hydroxybenzyl)-2-n-butyl malonate, (7) bis-(N-methyl-2.2.6.6-tetramethyl-4-biperidinyl) sebacate, (8) 1.1'-(1.2- ethanediyl)bis(3.3,5.5-tetramethylpiperazinone), (9)(mixto2,2,6.8-tetramethyl-4
-biperidyl/tridecyl)-1.2.3.4-butanetetracarboxylate, (10) (Mixto L, 2,2,8.6-pentamethyl-4-biperidyl/tridecyl)-1.2,3.
4-Butanetetracarpoxylate, (1I) mixed {2,2,6.6-tetramethyl-4-piperidyl/β1 β,β゜,β゜-tetramethyl-3-9-[2.4, 8.10-Tetraoxaspiro(5.5)undecane]diethyl l-1.2,3.4-
Butane tetracarpoxylate, (l2) mix {1.2,2,6.6-pentamethyl-4-piperidyl/β,β,β゜,β゜-tetramethyl-3-9-[2.4, 8.10-Tetraoxaspi(5.5)undecane]diethyl l-1.2,3.4
-butane tetracarboxylate, (13)N. N-bis(3-aminopropyl)ethylenediamine-2-4-bis[N-butyl N-(1.2,
2.8.6-pentamethyl-4-piveridyl)amino]
-6-chloro-1.3.5- }riazine condensate, (14) poly[[6-N-morpholyl-1.3.5-
triazine-2-4-diyl][(2,2,6.8-tetramethyl-4-piperidyl)imino]hexamethylene[(2,2.6.6-tetramethyl-4-piperidyl)
1f mino]], (15) N,N'-bis(2,2,6
．． Condensate of 6-tetramethyl-4-piperidyl)hexamethylenediamine and 1,2-dibromoethane, (1B) [N-(2.2,6.6-tetramethyl-
4-piveridyl)-2-methyl-2-(2,2,6,B
-tetramethyl-4-piperidyl)imino]probionamide and the like.

Among them, the above (1) (2) (3) (4)
, (8), (10), (11), (14), and (15) are preferably used.

These hindered amine stabilizers may be used alone or in combination.

In the ultra-high molecular weight polyolefin composition according to the present invention, the above-mentioned hindered amine stabilizer (D) is contained in an amount of 0.00 parts by weight per 100 parts by weight of the total weight of the ultra-high molecular weight polyolefin (A) and the diluent (B). 005 to 5 parts by weight, preferably 0.01 to 0.5 parts by weight, more preferably 0.05 parts by weight
It is used in an amount of ˜0.2 parts by weight. When this hindered amine stabilizer (D) is used in an amount within the above range, it is possible to enhance the effect of improving heat resistance and weather resistance, and it is also economically advantageous, and it also improves the properties of the resin, such as It does not impair tensile elongation, etc.

Metal salt of higher fatty acid (E) The ultra-high molecular weight polyolefin composition according to the present invention comprises the above-mentioned ultra-high molecular weight polyolefin (A), a diluent (B
), organic phosphite stabilizers (C) and hindered amine stabilizers (D), as well as metal salts of higher fatty acids (
E) may be included.

Examples of metal salts of higher fatty acids include magnesium salts and calcium salts of higher fatty acids such as stearic acid, oleic acid, lauric acid, cabric acid, arachidic acid, valmitic acid, behenic acid, l2-hydroquine stearic acid, ricinoleic acid, and montanic acid. Salts, alkaline earth metal salts such as barium salts, alkali metal salts such as cadmium salts, zinc salts, lead salts, sodium salts, potassium salts, lithium salts, etc. are used. Specifically, the following compounds are used.

Magnesium stearate, magnesium laurate,
Magnesium palmitate, calcium stearate,
Calcium oleate, calcium laurate, barium stearate, barium oleate, barium laurate, barium arachidate, barium behenate, zinc stearate, zinc oleate, zinc laurate, lithium stearate, sodium stearate, valmitic acid Sodium, sodium laurate, potassium stearate, potassium laurate, calcium l2-hydroxystearate, calcium monocinate, etc.

These metal salts of higher fatty acids may be used alone or in combination.

In the ultra-high molecular weight polyolefin composition according to the present invention, the metal salt of higher fatty acid (E) as described above has a total weight of the ultra-high molecular weight polyolefin (A) and the diluent (B) 'm10
0.005 to 5 mm part based on 0 weight part, preferably L< is 0.0 1 to 0.5 weight Q part, more preferably 0.05
~0.5 part by weight is used in the dish. When this higher fatty acid metal salt (E) is used in an amount within the above range, the residual chlorine in the polymer derived from the catalyst is sufficiently absorbed, so resin deterioration can be prevented, and
It is economically advantageous and does not affect the properties of the resin, such as its tensile elongation.

Since the metal salts of higher fatty acids as described above have effects as lubricants and antirust agents, the ultra-high molecular weight Borio-L and fin compositions according to the present invention have excellent carving properties and are resistant to rust in carving machines, etc. Effective in prevention.

In addition to the above components (A), (B), (C), (D) and (E), the ultra-high molecular weight polyolefin composition according to the present invention includes, for example, heat stabilizers, weather stabilizers, pigments, dyes, Compounding agents such as lubricants and antistatic agents that are usually added to polyolefins can be added to the extent that they do not impair the purpose of the present invention.

The ultra-high molecular weight polyolefin composition according to the present invention has excellent thermal stability during molding, long-term thermal stability, and weather resistance, and is resistant to heat received when shaping molecularly oriented objects such as fibers and tapes. Since there is little deterioration, it can be used to produce molecularly oriented molded articles having high tensile strength, high tensile modulus, etc.

EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Ultra-high molecular weight polyethylene (intrinsic viscosity [η] -8.94d
R/g, measured in decalin solvent at 135°C) powder and 80 parts by weight of paraffin wax (manufactured by Hiki Seiro Co., Ltd., trade name: Luvax, melting point = 69°C) as a diluent. As a phosphite stabilizer, Tris (
2.4-di-t-butinolefueninole) phosphite (
Manufactured by Ciba Geigy Japan, product name: PIIOS PIII
Bis(2.2.6.6-tetramethyl-
4-piperidyl) sebacate (manufactured by Sankyo ■, product name: S
0.1 part by weight of ANOL 770) was blended and melt-spun under the following conditions.

The mixture was extruded using a screw extruder (screw diameter 25, L
/D-25, manufactured by Thermoplastics Co., Ltd.) to perform melt-kneading at a set temperature of 190°C, and then the melt was melt-spun using a spinning die with an orifice diameter of 2 mti attached to an extruder. Next, the extruded melt was taken under the conditions of an air gap of 180c+n and a draft ratio of 35 times, and was cooled and solidified in air to obtain undrawn fibers.

Furthermore, the undrawn fibers were drawn under the following conditions to obtain molecularly oriented fibers.

Two-stage stretching was performed using three godet rolls. At this time, the heating medium in the first drawing tank was n-decane at a temperature of 110°C, and the heating medium in the second drawing tank was triethylene glycol at a temperature of 145°C. The effective length of each tank was 50 cm. During stretching, the rotation speed of the first godet roll was 0.5/min, and the rotation speed of the third godet roll was 12.5/min (stretching ratio: 25 times).

The rotational speed of the second godet roll was appropriately selected within a range that allowed stable operation. Almost all of the initially mixed paraffin wax was extracted into n-decane during stretching.

Next, the obtained molecularly oriented fibers were washed with water, dried under reduced pressure at room temperature overnight, and subjected to measurement of intrinsic viscosity [η] and tensile properties. These measurement methods are as follows.

Intrinsic viscosity [η] Intrinsic viscosity of resin constituting molecularly oriented fibers measured in decalin solvent at 2435°C. Tensile properties: Tensile properties were measured using tensile strength and tensile strength using DCS-50M model tensile test manufactured by Shima Ritsu Seisakusho. The measurement was performed at room temperature (23°C) using a machine. At this time, the test length between the clamps was 100 mra, and the tensile speed was 100 nuw/min (
100% strain rate). The elastic modulus was calculated using the slope of the tangent at the initial elastic modulus. The fiber cross-sectional area required for the calculation was calculated from the weight, assuming a density of 0.960 g/cc.

The results are shown in Table 1.

Example 2 In Example 1, as the organic phosphite stabilizer,
Tris(2,4-di-t-butylphenyl) phosphite (Nippon Ciba Geigy Nakako Co., Ltd., trade name 2PIIOSPII)
ITE L68) as a hindered amine stabilizer, bis(2,2.6.6-tetramethyl 4-biperidyl) sebacate (manufactured by Sankyo ■, trade name: SA)
Molecularly oriented fibers were prepared in the same manner as in Example 1, except that 0.1 part by weight of NOL 770) was used and 0.3 part by weight of calcium stearate (manufactured by Sankyoki ■) was added as a higher fatty acid metal salt. was obtained and the above measurements were performed.

The results are shown in Table 1.

Example 3 In Example 1, as an organic phosphite stabilizer,
Tris(2,4-di-t-butylphenyl) phosphite (manufactured by Nippon Ciba Geigy ■, product name: PIIOSPII
ITE L68) as a hindered amine stabilizer, dimethyl-1-(2-hydroxyethyl)-4-hydroxy-2.2,8,[i-tetramethylbiperidine polycondensate (Made by Ciba Geigy Japan,
Molecularly oriented fibers were obtained in the same manner as in Example 1, except that 0.1 part by weight of KimaSorb 622LD (trade name: KimaSorb 622LD) was used, and the above measurements were performed.

The results are shown in Table 1.

Example 4 In Example 1, as an organic phosphite stabilizer,
Tris(2,4-di-t-butylphenyl) phosphite (manufactured by Nippon Ciba Geigy ■, product name: PIIOSPII
ITE L68) is 0.171! As a hindered amine stabilizer, dimethyl succinate (2-hydroxyethyl)-4-hydroxy-2.2.6.8-tetramethylpiveridine polycondensate (manufactured by Nippon Ciba Geigy, trade name: Molecularly oriented fibers were prepared in the same manner as in Example 1, except that 0.1 part by weight of KimaSorb 622LD) was used and 0.3 part by weight of calcium stearate (manufactured by Sankyoki ■) was added as a higher fatty acid metal salt. was obtained and the above measurements were performed.

The results are shown in Table 1.

Example 5 In Example 1, as the organic phosphite stabilizer,
Bis(2,6-di-t-butyl-4-methylphenyl)
Pentaerythritol diphosphite (manufactured by Adeka Argus Chemical ■, trade name: MARK PEP-36) was added to 0.
1 part by weight, as a hindered amine stabilizer, poly[[
6-(1,1.3.3-tetramethylbutyl)imino-
1,3.5-}-riazine-2,4-diyl][(2
,2,6.6-tetramethyl-4-piperidyl)imino]hexamethylene[(2,2.6.6-tetramethyl-
4-biperidyl)imino]co (Japan Ciba Geigy Nakako Co., Ltd.,
Molecularly oriented fibers were obtained in the same manner as in Example 1, except that 0.1 part by weight of KimaSorb 944LD (trade name: KimaSorb 944LD) was used, and the above measurements were performed.

The fruits are shown in Table 1.

Example 6 In Example 1, as the organic phosphite stabilizer,
Bis(2,6-di-t-butyl-4-methylphenyl)
Pentaerythritol diphosphite (manufactured by Adeka Argus Chemical ■, trade name: MARK PEP-36) was added to 0.
1 part by weight, as a hindered amine stabilizer, poly[[
6-(1,I.3.3-tetramethylbutyl)imino 1,3.5-1-riazine-2.4-diyl][(2
,2,8.6-tetramethyl-4-piperidyl)imino]hexamethylene[(2,2,6.6-tetramethyl-
4-piperidyl)imino]] (manufactured by Ciba Geigy Oki Japan,
Using 0.1 part by weight of KIMASORB 944LD),
Furthermore, except for adding 0.3 parts by weight of calcium stearate (manufactured by Sankyoki ■) as a higher fatty acid metal salt,
Molecularly oriented fibers were obtained in the same manner as in Example 1, and the measurements described above were performed.

The results are shown in Table 1.

Example 7 In Example 1, as an organic phosphite stabilizer,
Bis(2,6-di-t-butyl-4-methylphenyl)
Pentaerythritol diphosphite (manufactured by Adeka Argus Chemical ■, trade name: MARK PEP-36) was added to 0.
1 part by weight, as a hindered amine stabilizer, tetrakis (2,2.6.6-tetramethyl-4-piperidyl)
-1.2.3.4-Butanetetracarpoxylate (manufactured by Adeka Argus Chemical ■, product name: MARK LA-3
Molecularly oriented fibers were obtained in the same manner as in Example 1, except that 0.1 part by weight of 7) was used, and the above 7]111 determination was carried out.

The results are shown in Table 1.

Example 8 In Example 1, as the organic phosphite stabilizer,
Bis(2,6-di-t-butyl-4-methylphenyl)
Pentaerythritol diphosphite (manufactured by Adeka Argus Chemical ■, trade name: MARK PEP-36) was added to 0.
1 part by weight, as a hindered amine stabilizer, tetrakis (2.2,6.6-tetramethyl-4-piperidyl)
-1.2,3.4-butanetetracarboxylate (manufactured by Adeka Argus Chemical ■, product name: MARK LA-5
7) was used, and 0.1 part by weight of calcium stearate (manufactured by Sankyoki ■) was used as a higher fatty acid metal salt.
Molecularly oriented fibers were obtained in the same manner as in Example 1, except that 3 parts by weight were added, and the above measurements were performed.

The results are shown in Table 1.

Example 9 In Example 1, as the organic phosphite stabilizer,
Tetrakis(2,4-di-t-butylphenyl)-4,
0.1 part by weight of 4゜-biphenylene diphenyl phosphonite (manufactured by Sandoz, trade name: SANDOSTAB P-EPQ), bis(2,2,6.6-tetramethyl- 4-piperidyl) sebacate (manufactured by Sankyo ■, product name: SANOL 770)
In the same manner as in Example 1 except that 0.1 part by weight was used,
Molecularly oriented fibers were obtained and the δIII determination described above was performed.

The results are shown in Table 1.

Example 10 In Example 1, as an organic phosphite stabilizer,
Tetrakis(2,4-di-t-butylphenyl)-4.
4”-biphenylene diphenyl phosphonite (manufactured by Sandoz, product name: SANDOSTAB P-[EPQ)
0.1 part by weight, bis(2.2.6.6-tetramethyl-4-piveridyl) sebacate (manufactured by Sankyo Oki, trade name: SANOL 77) as a hindered amine stabilizer.
0) was used, and 0.1 part by weight of calcium stearate (manufactured by Sanshaki) was used as a higher fatty acid metal salt.
Molecularly oriented fibers were obtained in the same manner as in Example 1, except that 3 parts by weight were added, and the above measurements were performed.

The results are shown in Table 1.

Comparative Example 1 Molecularly oriented fibers were obtained in the same manner as in Example 1, except that neither the organic phosphite stabilizer nor the hindered amine stabilizer was used in Example 1.
Ilj determination was performed.

The results are shown in Table 1.

Table 1 Molecularly oriented fibers with good tensile properties and less decrease in intrinsic viscosity [η] due to truncations can be obtained from ultra-high molecular weight polyethylene compositions containing stabilizers.

Claims (1)

[Claims] 1) (A) 3 to 80% by weight of an ultra-high molecular weight polyolefin having an intrinsic viscosity [η] of 5 to 40 dl/g measured in a decalin solvent at 135°C; (B) a diluent: (C) Organophosphite stabilizer: 0.005 to 5 parts by weight per 100 parts by weight of the total weight of (A) ultra-high molecular weight polyolefin and (B) diluent; ) Hindered amine stabilizer: An ultra-high molecular weight polyolefin composition comprising 0.005 to 5 parts by weight of the hindered amine stabilizer based on 100 parts by weight of the total weight of (A) the ultra-high molecular weight polyolefin and (B) the diluent. 2) (A) ultra-high molecular weight polyolefin having an intrinsic viscosity [η] of 5 to 40 dl/g measured in a decalin solvent at 135°C: 3 to 80% by weight; (B) a diluent: 97 to 20% by weight. (C) Organic phosphite stabilizer: 0.005 to 5 parts by weight based on 100 parts by weight of the total weight of (A) ultra-high molecular weight polyolefin and (B) diluent; (D) Hindered amine stabilizer: 0.005 to 5 parts by weight based on 100 parts by weight of the total weight of (A) ultra-high molecular weight polyolefin and (B) diluent; (E) metal salt of higher fatty acid: (A) ultra-high molecular weight polyolefin and (B) ) An ultra-high molecular weight polyolefin composition comprising 0.005 to 5 parts by weight based on 100 parts by weight of the total weight of the diluent.