JPH10131048A - Agent for treating inorganic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inorganic fiber-treating agent excellent in an inorganic fiber-bundling property and capable of improving the adhesivity of the inorganic fibers to a matrix resin to give an inorganic fiber-reinforced resin excellent in mechanical strength. SOLUTION: This inorganic fiber-treating agent comprises an aqueous dispersion comprising (A) 100 pts.wt. of a first thermoplastic resin, (B) 1-60 pts.wt. of a second thermoplastic resin containing carboxyl groups or their salts bound to the chain of the polymer in a concentration of 0.05-5mmol equivalent converted into C(=0)0 groups per g of the polymer, (C) 0.5-40 pts.wt. of an anionic or nonionic surfactant, and (D) water in a water content of 3-90wt.%, wherein the resin solid contents exist as a fine dispersed particle phase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polyolefin, A
The present invention relates to an inorganic fiber treating agent for treating an inorganic fiber which reinforces a resin by dispersing and blending it with a resin such as BS, nylon, polyester, etc. More specifically, an inorganic fiber having excellent bunching properties of inorganic fiber and excellent mechanical strength The present invention relates to an inorganic fiber treating agent for providing a reinforced resin.

[0002]

2. Description of the Related Art Conventionally, after inorganic fibers have been melt-spun,
The fiber bundle is treated with a sizing agent. As sizing agents generally used, emulsions of starch aqueous solution, paraffin wax, vegetable oil and the like are used.
When inorganic fibers are used for resin reinforcement, the inorganic fibers are treated with a silane coupling agent, urethane, epoxy, acrylic emulsion, or the like, in order to improve the adhesion between the matrix resin and the inorganic fibers. .

However, particularly when the matrix resin is a polyolefin, the inorganic fibers treated with the emulsion do not have sufficient adhesion to the matrix resin, and the strength of the fiber-reinforced resin is not improved. The emergence of emulsions is desired.

Japanese Patent Application Laid-Open No. 6-107442 discloses a sizing agent for inorganic fibers comprising an aqueous emulsion containing a polypropylene resin modified with an unsaturated dicarboxylic acid or a salt thereof as an essential component. However, even if the inorganic fibers treated with the inorganic fiber sizing agent are blended,
The improvement of the strength of the fiber reinforced resin is insufficient.

On the other hand, Japanese Patent Application Laid-Open No. 62-11544 discloses a thermoplastic resin, a thermoplastic polymer having a —C ((O) O— group bonded thereto, an anionic surfactant, a natural oil or a synthetic oil, and water. Aqueous dispersions are described. However, the above publication does not disclose the use of the above aqueous dispersion as an inorganic fiber treating agent.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems by improving the convergence of inorganic fibers and improving the adhesion between inorganic fibers and a matrix resin. Accordingly, an object of the present invention is to provide an inorganic fiber treating agent capable of obtaining a fiber reinforced resin having excellent mechanical strength.

[0007]

According to the present invention, (A) a carboxylic acid or a salt thereof bonded to a polymer chain is added to 100 parts by weight of the first thermoplastic resin in an amount of 1 gram of the resin. Win, Formula (1)

Embedded image 1 to 60 parts by weight of a second thermoplastic resin containing a concentration of 0.05 to 5 millimolar equivalent in terms of a group represented by: (C) 0.5 to 40 parts by weight of an anionic or nonionic surfactant,
And (D) an aqueous dispersion containing water, wherein the water content is from 3 to 90% by weight, and the resin solid content is an aqueous dispersion comprising a finely dispersed particle phase. It is a processing agent.

[0008] The first thermoplastic resin (A) which is one of the components constituting the aqueous dispersion as the inorganic fiber treating agent of the present invention.
Is water-insoluble and non-water-swellable,
It is a thermoplastic resin that itself lacks dispersibility in water. As the first thermoplastic resin (A), it is preferable to use a thermoplastic resin compatible with the matrix resin containing the inorganic fibers treated with the inorganic fiber treating agent of the present invention. It is preferable to use a rubber-like thermoplastic resin.

Specific examples of the first thermoplastic resin (A) include homopolymers such as low-density polyethylene, high-density polyethylene, polypropylene, poly 1-butene and poly 4-methyl-1-pentene; Or ethylene,
A random or block copolymer polyolefin of a plurality of α-olefins selected from α-olefins such as propylene, 1-butene and 4-methyl-1-pentene; ethylene / butadiene copolymer, ethylene / ethylidene norbornene copolymer Copolymer of α-olefin and conjugated diene or non-conjugated diene represented by union; ethylene / propylene / butadiene terpolymer;
Conjugated with two or more α-olefins represented by propylene / dicyclopentadiene terpolymer, ethylene / propylene / ethylidene norbornene terpolymer, and ethylene / propylene / 1,5-hexadiene terpolymer Copolymer with diene or non-conjugated diene; Ethylene / vinyl compound copolymer such as ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl chloride copolymer; ethylene / (meth) acrylic Copolymers of ethylene / α, β-unsaturated carboxylic acids and derivatives thereof, such as acid copolymers and ethylene / (meth) acrylate copolymers;

Styrene resins such as polystyrene, acrylonitrile / styrene copolymer, ABS, α-methylstyrene / styrene copolymer; polyvinyl chloride, polyvinylidene chloride, vinyl chloride / vinylidene chloride copolymer, polymethyl acrylate , Polymethyl methacrylate and other polyvinyl compounds; nylon 6, nylon 66, nylon 6
Polyamides such as 10, nylon 11, nylon 12, etc .; thermoplastic polyesters such as polyethylene terephthalate and polybutylene terephthalate; polycarbonate, polyphenylene oxide; polystyrene-conjugated diene copolymer, polystyrene-conjugated diene-polystyrene triblock copolymer and water thereof And styrene block copolymers such as additives. In addition, hydrocarbon resins such as rosin, terpene resin, coumarone indene resin, terpene phenol resin, aliphatic petroleum resin, aromatic petroleum resin, DCPD resin and hydrogenated resin can be mentioned. These can be used alone or as a mixture.

The α-olefin is ethylene,
Propylene, 1-butene, 3-methyl-1-butene, 4
-Methyl-1-pentene, 3-methyl-1-pentene,
Examples thereof include α-olefins having 2 to 12 carbon atoms, such as 1-hexene, 1-heptene, 1-decene, and 1-dodecene.

Among these first thermoplastic resins (A), olefin resins are particularly preferred, and α-olefin copolymers are more preferred. That is, ethylene,
Propylene, 1-butene, 3-methyl-1-butene, 4
-Methyl-1-pentene, 3-methyl-1-pentene,
2 selected from α-olefins having 2 to 12 carbon atoms such as 1-hexene, 1-heptene, 1-decene, 1-dodecene, etc.
Copolymers of more than one monomer are preferred. Specific examples include propylene / ethylene copolymer, propylene / butene copolymer, ethylene / butene copolymer, propylene / butene / ethylene copolymer, and the like.

The second thermoplastic resin (B) which is one of the components constituting the aqueous dispersion which is the inorganic fiber treating agent of the present invention.
Is a group of a carboxylic acid or a salt thereof bonded to a polymer chain of a resin in an amount of 0.05 to 5 millimoles, preferably 0.1 to 5 millimoles in terms of a group represented by the formula (1) per gram of the resin.
A thermoplastic resin containing at a concentration of ４4 millimolar equivalents. Further, the second thermoplastic resin (B), like the first thermoplastic resin (A), is not only water-insoluble and non-water-swellable but also lacks dispersibility in water itself. It is a thermoplastic resin.

The second thermoplastic resin (B) is prepared by adding a monomer having a neutralized or unneutralized carboxylic acid group to the same thermoplastic resin as the first thermoplastic resin (A). And / or a monomer having a saponified or unsaponified carboxylic ester group can be obtained by graft copolymerization. In some cases, after the graft copolymerization, a neutralization reaction or a saponification reaction can be performed with a basic substance. In this case, the resin may be a partially neutralized product or a partially saponified product in which a carboxylic acid group or a carboxylic acid ester group that is not neutralized or saponified coexists.

The second thermoplastic resin (B) is composed of a monomer similar to the monomer constituting the first thermoplastic resin (A) and a neutralized or unneutralized carboxylic acid. It can also be obtained by graft copolymerization, block copolymerization or random copolymerization of a monomer having an acid group and / or a monomer having a saponified or unsaponified carboxylic ester group. it can. In some cases, after the copolymerization, a neutralization reaction or a saponification reaction can be performed with a basic substance. In this case, the resin may be a partially neutralized product or a partially saponified product in which a carboxylic acid group or a carboxylic acid ester group that is not neutralized or saponified coexists.

When the second thermoplastic resin (B) is obtained by post-neutralization or post-saponification, the polymer as a raw material is, for example, a monomer having a neutralized or non-neutralized carboxylic acid group. And / or a monomer having a saponified or unsaponified carboxylic acid ester group graft-copolymerized or a monomer constituting the first thermoplastic resin (A). A monomer having a neutralized or unneutralized carboxylic acid group, and / or a monomer having a saponified or unsaponified carboxylic acid ester group. .

Examples of the monomer having a neutralized or unneutralized carboxylic acid group and the monomer having a saponified or unsaponified carboxylic acid ester group include, for example, ethylenically unsaturated monomers. Saturated carboxylic acids, anhydrides and esters thereof, and the like can be mentioned.

The above-mentioned ethylenically unsaturated carboxylic acids include (meth) acrylic acid, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid and the like. -Bicyclo [2,2,1] hept-5-ene 2,3-dicarboxylic acid), maleic anhydride, citraconic anhydride, etc., as unsaturated carboxylic acid esters such as methyl, ethyl and ethylenically unsaturated carboxylic acids. Monoester or diester such as propyl can be exemplified. These monomers can be used alone,
Also, a plurality can be used.

In order to produce a modified product by graft-copolymerizing a graft monomer selected from the above monomers onto a thermoplastic resin to be grafted, various conventionally known methods can be employed. For example, melting the grafted thermoplastic resin,
A method of adding a graft monomer and performing graft copolymerization,
Alternatively, a method of dissolving in a solvent, adding a graft monomer, and performing graft copolymerization may be mentioned. In any case, the reaction is preferably performed in the presence of a radical initiator in order to efficiently graft-copolymerize the graft monomer.

The grafting reaction is usually performed at a temperature of 60 to 350 ° C. The proportion of the radical initiator used is usually 0.01 to 10 parts by weight per 100 parts by weight of the thermoplastic resin to be grafted.
It is in the range of parts by weight. Examples of the radical initiator include organic peroxides, organic peresters, and other azo compounds. Among these radical initiators, dicumyl peroxide, di-tert-butyl peroxide,
2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, 1,4-bis (tert-butylperoxy) Dialkyl peroxides such as (isopropyl) benzene are preferred.

The amount of the ethylenically unsaturated carboxylic acid, its anhydride or its ester to be introduced is 0.1 g / g of resin in terms of the group represented by the above formula (1).
It is in the range of from 0.5 to 5 milliequivalents, preferably from 0.1 to 0.4 milliequivalents.

Basic substances used for neutralization and saponification include substances which act as bases in water, such as alkali metals, alkaline earth metals, ammonia and amines, alkali metal oxides, hydroxides, weak bases, and the like. Examples of such substances include hydrides, alkaline earth metal oxides, hydroxides, weak bases, hydrides, and other substances that act as bases in water, and alkoxides of these metals. Examples of such substances are shown below.

Examples of the alkali metal include sodium and potassium, and examples of the alkaline earth metal include calcium, strontium and barium. Examples of the amine include inorganic amines such as hydroxylamine and hydrazine, and organic amines such as methylamine, ethylamine, ethanolamine, and cyclohexylamine.

Examples of the alkali metal and alkaline earth metal oxides, hydroxides and hydrides include sodium oxide, sodium peroxide, potassium oxide, potassium peroxide, calcium oxide, strontium oxide, barium oxide, and hydroxide. Examples include sodium, potassium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, sodium hydride, potassium hydride, calcium hydride, and the like.

Examples of the weak bases of the alkali metals and alkaline earth metals include sodium carbonate, potassium carbonate, sodium hydrogencarbonate, potassium hydrogencarbonate, calcium hydrogencarbonate, sodium acetate, potassium acetate, calcium acetate and the like. Examples of the ammonia and amine compounds include ammonium hydroxide, quaternary ammonium compounds such as tetramethylammonium hydroxide and hydrazine hydrate.

The carboxylate or carboxylate group neutralized or saponified by a basic substance includes:
An alkali metal carboxylate such as sodium carboxylate and potassium carboxylate or ammonium carboxylate is preferred, and potassium carboxylate is particularly preferred.

It is preferable that the second thermoplastic resin (B) is selected from those having good compatibility with the target first thermoplastic resin (A). That is, when an aqueous dispersion of an olefin resin is intended, a polymer containing an olefin monomer in the main chain should be selected. For example, as the first thermoplastic resin (A), polyethylene, polypropylene, etc. When polyolefins or ethylene / vinyl acetate copolymers are used, these maleic acid grafts, ethylene / (meth) acrylic acid copolymers, ethylene / methyl (meth) acrylate copolymers, etc. It is preferable to use a hydrate or a saponified product.

In the present invention, as the surfactant (C), an anionic (C-1) or nonionic surfactant (C-
2) is blended. As the anionic surfactant (C-1), known anionic surfactants can be used without limitation, and examples thereof include primary higher fatty acid salts, secondary higher fatty acid salts, and primary higher alcohols. Sulfate salts, secondary higher alcohol sulfate salts, primary higher alkyl sulfonates, secondary higher alkyl sulfonates, higher alkyl disulfonates, sulfonated higher fatty acid salts,
Higher fatty acid sulfate, higher fatty acid ester sulfonate, higher alcohol ether sulfate sulfonate,
Sulfonates of higher alcohol ethers, alkylolated sulfates of higher fatty acid amides, alkyl benzene sulfonates, alkyl phenol sulfonates, alkyl naphthalene sulfonates, alkyl benzimidazole sulfonates, and the like.

These anionic surfactants (C-1)
Among them, particularly preferred are higher fatty acids, especially salts of saturated or unsaturated higher fatty acids having 10 to 20 carbon atoms, especially alkali metal salts, and more specifically, capric acid, undecane Acid, lauric acid, myristic acid, palmitic acid, margaric acid, stearic acid,
Examples thereof include saturated fatty acids such as arachiic acid, unsaturated fatty acids such as phosphatic acid, tunic acid, petroseric acid, oleic acid, linoleic acid, linolenic acid, and arachidonic acid, and alkali metal salts of mixtures thereof.

As the nonionic surfactant (C-2), known nonionic surfactants can be used without limitation. Examples thereof include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether,
Polyoxyethylene fatty acid ester, polyoxyethylene fatty acid amide ether, polyhydric alcohol fatty acid ester, polyoxyethylene polyhydric alcohol fatty acid ester, fatty acid sucrose ester, alkylolamide, polyoxyalkylene block copolymer and the like can be mentioned.

As the surfactant (C-1), an anionic surfactant (C-1) or a nonionic surfactant (C-2) can be used alone or in combination. You can also. Further, an anionic surfactant (C-1) and a nonionic surfactant (C-2) can be used in combination.

In the aqueous dispersion of the present invention, the above-mentioned components are present in a certain ratio in a certain range. That is, 1 to 60 parts by weight, preferably 2 to 50 parts by weight of the second thermoplastic resin (B) per 100 parts by weight of the first thermoplastic resin (A), and an anionic or nonionic surfactant ( C) is present in a quantity ratio of 0.5 to 40 parts by weight, preferably 1 to 30 parts by weight.

The aqueous dispersion of the present invention further contains water in the above-mentioned composition, and the water content is 3 to 90% by weight, preferably 5 to 70% by weight based on the whole aqueous dispersion.
% By weight. If the water content is less than 3% by weight, an aqueous dispersion cannot be obtained, and if it exceeds 90% by weight, the solid content concentration is too low, which is disadvantageous, for example, in terms of thermal energy cost during drying. When the water content is in the range of 3 to 25% by weight, this aqueous dispersion apparently exhibits properties as a solid or a paste, while at 35% by weight or more, it exhibits properties as an aqueous dispersion.

The aqueous dispersion of the present invention is an aqueous dispersion in which resin solids derived from the first thermoplastic resin (A) and the second thermoplastic resin (B) exist as a finely dispersed particle phase. The average particle size of the resin solids forming the finely dispersed particle phase is desirably 0.01 to 5 μm, preferably 0.1 to 2 μm.

Next, the method for producing the aqueous dispersion of the present invention will be described. In the aqueous dispersion of the present invention, for example, the components (A), (B) and (C) are melt-kneaded (hereinafter, sometimes referred to as a first step), and water is added to the obtained melt-kneaded product. It can be produced by inverting the phase of a resin solid so as to be dispersed particles (hereinafter, sometimes referred to as a second step).

At this time, instead of using the second thermoplastic resin (B) having a carboxylate group, neutralization and / or
Or a saponifiable carboxylic acid attached to the polymer chain,
Using a second thermoplastic resin (B) containing the anhydride or ester group thereof at a concentration of 0.05 to 5 millimolar equivalents per gram of the resin in terms of the group represented by the formula (1). Neutralization and / or saponification may be performed later with the basic substance, and instead of the anionic surfactant (C-1), anionic surfactant may be neutralized with a basic substance. Kneading may be performed using an organic compound to be the agent (C-1), and neutralization may be performed later.

The temperature at the time of melt-kneading in the first step is preferably not lower than the melting point of the higher melting point resin among the resins used, and more preferably not lower than the temperature at which the melt viscosity is not higher than 10 ⁵ mPa · s. .

The amount of water added in the second step is within the above-mentioned range. In the second step, when an unneutralized and / or unsaponified second thermoplastic resin (B) is used and / or an unneutralized anionic surfactant (C-1) organic compound is used. When used, basic substances necessary for neutralizing them are added. Suitable examples of basic substances are those already mentioned above, which may be added directly, but are preferably added in the form of an aqueous solution. The first step and the second step may be performed sequentially or simultaneously.

The melt-kneading means which can be used in the first step may be any known means, but preferred examples include a kneader, a Banbury mixer, and a multi-screw extruder. Water is sequentially dropped and melt-kneaded, and the produced aqueous dispersion is then cooled naturally or artificially to room temperature. At this time, the dispersed particles solidify to form a stable aqueous dispersion.

By producing the aqueous dispersion in this manner, the aqueous solid in which the resin solids derived from the first thermoplastic resin (A) and the second thermoplastic resin (B) are present as a finely dispersed particle phase. A dispersion is obtained.

In the production of the aqueous dispersion, various auxiliary materials which can be usually used for the aqueous dispersion, such as an emulsifier, a stabilizer, a wetting agent, a thickener, a foaming agent, a defoaming agent,
A coagulant, a gelling agent, an antioxidant, a plasticizer, a filler, a coloring agent, a fragrance, an antiadhesive, a release agent, and the like can be used in combination as needed.

The inorganic fiber treating agent of the present invention comprises the above-mentioned aqueous dispersion, and is used as a treating agent for inorganic fibers to be added to the fiber reinforced resin.

The inorganic fibers to be treated with the inorganic fiber treating agent of the present invention are not particularly limited, and examples thereof include glass fibers, carbon fibers, alumina fibers, ceramic fibers, rock fibers, slug fibers, and metal fibers. It can be widely used for inorganic fibers conventionally known as a resin reinforcing material. Among the inorganic fibers, glass fibers are preferable, and specific examples thereof include glass roving, glass chop strand, glass milled fiber, glass powder,
Glass stable, glass cloth and the like can be mentioned.

In order to treat the inorganic fibers with the inorganic fiber treating agent of the present invention, the treating agent is adhered to the inorganic fibers by, for example, a dipping method, a spraying method, a roller coating method, and the like, and then at 80 to 130 ° C. A method such as drying for about 60 hours can be adopted. In this case, the amount of the treatment agent attached to the inorganic fibers is not particularly limited, but it is generally preferable to attach the treatment agent to the inorganic fibers at a solid content of about 0.1 to 5% by weight, preferably about 0.2 to 3% by weight. .

The inorganic fiber treated with the inorganic fiber treating agent of the present invention is used as a resin reinforcing material. Specific matrix resins include polyolefins such as polyethylene and polypropylene; thermoplastic resins such as nylon, polyester, polycarbonate, polyacetal, polyvinyl chloride, cellulosic resins, polystyrene and acrylonitrile-styrene copolymer; phenolic resins and epoxy resins And thermosetting resins such as unsaturated polyester resins, sialyl phthalate resins, urethane resins, melamine resins and urea resins.

The amount of the inorganic fiber treated with the inorganic fiber treating agent of the present invention relative to the matrix resin is usually 5 to 70 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the matrix resin. It is desirable to do. If the amount of the inorganic fiber is less than 5 parts by weight, the mechanical strength, particularly the heat resistance, is unfavorably reduced.
If it exceeds 0 parts by weight, the melt fluidity decreases,
It is not preferable because the appearance of the surface of the molded article is impaired.

The inorganic fibers treated with the inorganic fiber treating agent of the present invention include cements such as Portland cement and alumina cement, Al ₂ O ₃ , SiO ₂ , B ₄ C, TiB ₂ and ZnB.
r and other inorganic polar materials such as ceramic materials.

The inorganic fiber treating agent of the present invention is excellent in the convergence of the inorganic fibers and can improve the adhesion between the inorganic fibers and the matrix resin. Therefore, by blending the inorganic fiber treated with the inorganic fiber treating agent of the present invention into a matrix resin, a fiber reinforced resin having excellent mechanical strength can be obtained.

It is not clear why the inorganic fiber treating agent of the present invention is excellent in the sizing property of the inorganic fibers and can improve the adhesion between the inorganic fibers and the matrix resin. This is presumed to be because the dispersed polar group represented by the formula (1) uniformly adheres to the inorganic fibers.

[0050]

The inorganic fiber treating agent of the present invention comprises an aqueous dispersion containing a first thermoplastic resin, a specific second thermoplastic resin, an anionic or nonionic surfactant, and a specific amount of water. Therefore, it is possible to improve the convergence of the inorganic fibers and improve the adhesion between the inorganic fibers and the matrix resin, thereby obtaining a fiber-reinforced resin having excellent mechanical strength.

[0051]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments are described below, but the present invention is not limited to these embodiments. Production Example 1 100 parts by weight of a propylene / butene copolymer (butene content = 30 mol%, MI = 3.2) as a first thermoplastic resin, and maleic anhydride graft as a second thermoplastic resin having a carboxylic acid group Polyethylene (graft amount = 3.
3 wt%, -C (= O) O- group = 0.67 mmole /
g) 10 parts by weight and 2 parts by weight of potassium oleate were mixed, and a twin-screw extruder (PCM- manufactured by Ikegai Iron Works)
30 L / D = 20) 3000 parts by weight from hopper /
The extruder was fed at a rate of time, and an 18.7% aqueous solution of potassium hydroxide was supplied with 103.8 from a supply port provided in a vent portion of the extruder.
It is continuously supplied at a rate of parts by weight / hour, and the heating temperature is 200
Extruded continuously at ° C.

The extruded melt-kneaded product was cooled to 90 ° C. by a jacketed static mixer installed at the outlet of the extruder, and further poured into warm water of 80 ° C., and adjusted to a solid content concentration of 45 wt%. A dispersion was obtained. The average particle size of the obtained dispersion was 0.45 μm as measured by Microtrack.

Production Example 2 Propylene / butene / ethylene terpolymer (C ₂ / C ₃ / C ₄ = 11/66/23) as the first thermoplastic resin
(Mol%), MI = 6.5) and maleic anhydride-grafted polypropylene (graft amount = 4.5 wt%, -C (= O)) as a second thermoplastic resin having a carboxylic acid group.
O-group = 0.92 mmol / g) and a dispersion was obtained in the same manner as in Production Example 1. The average particle size of the obtained dispersion was 0.5 μm.

Example 1 The dispersion obtained in Production Example 1 was added to glass fibers having a diameter of 13 μm as solids in an amount of 1.0% by weight, and 1000 glass fibers were bundled into a strand, and the strand was cut. A chopped strand having a length of 3 mm was obtained. Polypropylene ([η] = 1.8 dl / g, melting point =
162 ° C.) 100 parts by weight of the above treated glass fiber 43
After mixing by weight and stirring with a tumbler mixer,
Granulation was performed with a single screw extruder having a diameter of mΦ.

A test piece was injection-molded from the obtained pellet, and the strength of the fiber-reinforced resin was measured using the test piece. The resin strength was measured according to the following method. Table 1 shows the results
It was noted in. Tensile strength: ASTM D638 Bending strength: ASTM D790

Example 2 Using the dispersion obtained in Production Example 2, a fiber reinforced resin was prepared in the same manner as in Example 1, and the resin properties were measured. The results are shown in Table 1.

Comparative Example 1 A sample was prepared in the same manner as in Example 1 except that a urethane resin emulsion was used instead of the dispersion used in Example 1, and the resin physical properties were measured. The results are shown in Table 1.

[0058]

[Table 1]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08L 101/00 C08L 101/00

Claims (1)

[Claims] (A) 100 parts by weight of a first thermoplastic resin, (B) a group of a carboxylic acid or a salt thereof bonded to a polymer chain, per 1 gram of the resin, the formula (1) 1) 1 to 60 parts by weight of the second thermoplastic resin containing 0.05 to 5 millimolar equivalent in terms of group represented by the following formula: (C) anionic or nonionic surfactant 0.5 to
An aqueous dispersion containing 40 parts by weight, and (D) water, wherein the water content is 3 to 90% by weight and the resin solid content is an aqueous dispersion present as a finely dispersed particle phase. Inorganic fiber treating agent.