JPH06279629A - Colorant composition for olefinic thermoplastic elastomer - Google Patents

Abstract

(57) [Summary] [Constitution] As a vehicle for a coloring agent for coloring an olefin-based thermoplastic elastomer, a homopolymer of propylene and / or a random copolymer of propylene and ethylene is contained in the composition in an amount of 20 to 98% by weight. The colorant composition for olefinic thermoplastic elastomer contained. [Effect] It is possible to prevent the plate-out phenomenon and suppress the deterioration of the moldability, and to provide a colored molded product having a good surface smoothness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel colorant composition for olefin-based thermoplastic elastomers, and more specifically, the present invention relates to a colored olefin-based thermoplastic elastomer for calender rolls, mixing rolls,
The present invention relates to a colorant composition to be used when processed with a textured roll or the like, when processed into a sheet by T-die extrusion molding, or when color-formed by olefin thermoplastic elastomer injection molding.

[0002]

BACKGROUND OF THE INVENTION Olefinic thermoplastic elastomer (T
(Sometimes abbreviated as PO) is a polyolefin-based plastic such as polyethylene or polypropylene as a hard segment and EP as a soft segment.
A composite material that is mechanically blended or partially cross-linked at the same time with a rubber mainly composed of an ethylene-based elastomer such as DM or EPM, and is colored and molded with various organic pigments or inorganic pigments, such as a film or a sheet. It is processed into various molded products. As a colorant for the olefinic thermoplastic elastomer, a low density polyethylene or a wax thereof has been generally used as a vehicle. However, when such a conventional coloring agent is used, the pigment adheres to the roll surface or the inner wall surface of the die of the T-die (generally called plate-out) during the molding process, which may cause contamination of the processing machine. Formability is unavoidably impaired, and sheets formed in such a state have problems such as lack of surface smoothness and poor product appearance.

[0003]

DISCLOSURE OF THE INVENTION The present invention overcomes the drawbacks of the conventional colorants for olefinic thermoplastic elastomers, prevents the plate-out phenomenon and suppresses the deterioration of the moldability, and the surface The object of the present invention is to provide a colorant composition for an olefinic thermoplastic elastomer, which can give a colored molded article having good smoothness.

[0004]

The inventors of the present invention have conducted extensive studies to develop a colorant composition for an olefinic thermoplastic elastomer having the above-mentioned preferable properties, and as a result, propylene alone was used as a vehicle for the colorant. It was found that the object can be achieved by a colorant composition containing a polymer and / or a random copolymer of propylene and ethylene in a composition at a predetermined ratio, and the present invention is based on this finding. It came to completion. That is, the present invention provides a homopolymer of propylene and / or a random copolymer of propylene and ethylene as a vehicle of a coloring agent for coloring an olefin-based thermoplastic elastomer in a composition.
The present invention provides a colorant composition for an olefinic thermoplastic elastomer, characterized in that it is contained in an amount of up to 98% by weight.

The present invention will be described in detail below. In the colorant composition of the present invention, as a vehicle for the colorant, a homopolymer of propylene, a random copolymer of propylene and ethylene, or a combination thereof is used. These polypropylenes, solution polymerization using a metal catalyst, suspension polymerization, by gas phase polymerization, etc.,
It can be produced by polymerizing propylene alone or propylene and ethylene. The propylene homopolymer has an II value (isotactic index) of 95% or more and a density of 0.90 to 0.91 g.
/ Ml, melting point is 160 ° C or higher, and MFR is 0.3
Those in the range of up to 50 g / 10 minutes are preferable. On the other hand, a random copolymer of propylene and ethylene has a melting point of 140 to 155 ° C and a density of 0.90 to 0.91.
It is preferably g / ml and has an MFR in the range of 0.5 to 30 g / 10 minutes.

The propylene homopolymer and / or the propylene / ethylene copolymer must be contained in the colorant composition in an amount of 20 to 98% by weight. From the viewpoint of the balance between various physical properties and economic efficiency, it is preferable that the content be 20 to 80% by weight. In the colorant composition of the present invention, an organic pigment or an inorganic pigment is used as a colorant. Examples of organic pigments include azo-based, phthalocyanine-based, nitro- or nitrone-based, basic dye-based, acid dye-based, mordant dye-based pigments, and the like, and inorganic pigments include, for example, titanium oxide, yellow lead, and red iron oxide. And so on. Furthermore, carbon black or the like can be used. Further, in the colorant composition of the present invention, various additive components as necessary, for example, dispersibility of the pigment, processability at the time of molding, wax used for the purpose of improving various physical properties, low molecular weight polyethylene,
Polymers such as styrene copolymer, petroleum resin, rosin,
Metal soap and various higher fatty acid amides as lubricants, other dispersion aids, phenol-based, thiobisphenol-based,
An amine-based or phosphorus-based antioxidant, a hindered amine-based UV stabilizer, a benzotriazole-based or benzophenone-based UV absorber, and the like can be added at any ratio. Further, for the purpose of controlling the fluidity of the colorant composition during molding, for example, low density polyethylene, high density polyethylene, medium density polyethylene, E
Other polyolefins such as VA can be added in small amounts. Examples of the olefin thermoplastic elastomer to which the colorant composition of the present invention is applied include graft copolymers of polyethylene and butyl rubber, ethylene-propylene copolymer rubber, ethylene-propylene-polyene copolymer rubber, polyolefin resin and ethylene. A thermoplastic resin composition obtained by dynamically heat-treating a blend with an α-olefin copolymer rubber (for example, Japanese Patent Publication No.
-34210, JP-A-53-149240, JP-A-53-149241), and a dynamically heat-treated blend of a polyolefin resin and an ethylene / α-olefin copolymer rubber. A thermoplastic composition (for example, JP-A-53-145857 and JP-A-54-16554) obtained by further blending the obtained resin with a polyolefin resin, a peroxide non-crosslinking polyolefin resin, and Examples thereof include a thermoplastic composition obtained by dynamically heat-treating a blend of an ethylene / α-olefin copolymer rubber (for example, JP-A-55-71739).

[0007]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The plate-out property of the colorant composition was evaluated as follows. (1) Evaluation of plate-out property by T-die extrusion molding Colorant composition and olefinic thermoplastic elastomer [Millastomer 5030N, manufactured by Mitsui Petrochemical Co., Ltd., hardness 5
0] was blended in a weight ratio of 7: 100, and then the mixture was mixed with a 40φT die extruder set at a temperature of 230 ° C.
A colored sheet having a thickness of 500 μm is extruded and wound on a polishing roll. After the extrusion molding is performed for 30 minutes, the plate-out product adhered over the entire surface of the polishing roll is wiped off with absorbent cotton impregnated with an organic solvent. The stain state of the absorbent cotton at this time was visually determined, and the plate-out property of the colorant composition was evaluated on a scale of 5 from 1 to 5. The criteria for judgment are as follows. 1: Severely soiled 2: Severely soiled 3: Stainably soiled 4: Slightly soiled 5: Almost soiled (2) Evaluation of plate-out property by mixing roll processing Color ratio of the colorant composition and olefinic thermoplastic elastomer (Milastomer 5030N) in a weight ratio After blending at a ratio of 7: 100, melt-kneading is performed with an 8-inch mixing roll heated to 185 ° C. Then, after rotating the material for 3 minutes as it is, remove the material, wipe off the plate-out on the entire surface of the mixing roll with absorbent cotton impregnated with an organic solvent, and visually determine the contamination status of this absorbent cotton. The plate-out property of the colorant composition is evaluated on a scale of 5 from 1 to 5. The criterion is the same as in (1) above.

The components used in the preparation of the colorant composition are shown below. Base polymer PP-1 [homopolymer] (Idemitsu Polypro J-700G, manufactured by Idemitsu Petrochemical Co., Ltd., M
FR8.0) PP-2 [Homopolymer] (Asahi Kasei Polypro M1700, Asahi Kasei Corp., MFR3
0.0) PP-3 [Homopolymer] (UBE Polypro B101H, Ube Industries, Ltd., MFR
0.8) PP-4 [random copolymer] (Sumitomo Noblen S131, Sumitomo Chemical Co., Ltd., MFR
1.2) PP-5 [random copolymer] (Sumitomo Noblen W531, manufactured by Sumitomo Chemical Co., Ltd., MFR
8.0) PP-6 [block copolymer] (Mitsubishi Polypro BC03C, manufactured by Mitsubishi Petrochemical Co., Ltd., MFR3)
0.0) PP-7 [block copolymer] (Mitsubishi Polypro BC8, Mitsubishi Yuka Co., Ltd. MFR1.
8) LDPE (Shorex F171, Showa Denko KK, MFR
7.0) LLDPE (Ultzex 3021F, manufactured by Mitsui Petrochemical Co., Ltd., M
FR2.1) HDPE (HIZEX 5000S, manufactured by Mitsui Petrochemical Co., MF
R0.9) EVA (Evaflex P1905, manufactured by Mitsui DuPont, M
FR2.5) TPO-1 (Milastomer 8030N, manufactured by Mitsui Petrochemical Co., Ltd., hardness 80) TPO-2 (Milastomer 5030N, manufactured by Mitsui Petrochemical Co., Ltd., hardness 50) -Pigment Copper phthalocyanine blue (Cyanine SR5020, manufactured by Dainichiseika Co., Ltd.) ) Quinacridone red (Super Magenta RE03, manufactured by Dainippon Ink and Chemicals) Condensed azo yellow (Chlomophthalo yellow 3G, manufactured by Ciba Geigy) ・ Other additives Polyethylene wax (Sun wax 151P, Sanyo Kasei mp105 ° C) Antioxidant (Irganox 1010, manufactured by Ciba Geigy Co., Ltd.) Examples 1 to 12, Comparative Examples 1 to 9 After the components of the types and amounts shown in Tables 1 and 2 were melted and kneaded in advance with a mixing roll to make them uniform. , Sheet-like, 3 × 3 mm with square pelletizer
Of square pellets and then 30 square pellets
A colorant composition was prepared by extruding with a φ-vent type extruder and cutting the strand. The plate-out property of this colorant composition was evaluated. The results are shown in Tables 1 and 2.

[0009]

[Table 1]

[0010]

[Table 2]

[0011]

[Table 3]

As can be seen from Tables 1 and 2, those using a homopolymer of propylene or a random copolymer of propylene and ethylene as the base polymer of the colorant composition are not suitable for polishing rolls during T-die molding. The state of contamination was remarkably improved, the continuous molding operation was sufficiently possible, and in the mixing roll processing, these rolls were free from stains and the moldability and the surface appearance of the molded product were good.

[0013]

EFFECTS OF THE INVENTION The colorant composition for olefinic thermoplastic elastomers of the present invention can prevent a plate-out phenomenon and suppress the deterioration of moldability, and can give a colored molded article having good surface smoothness. it can. The colorant composition is prepared by processing a colored olefin-based thermoplastic elastomer with a calendar roll, a mixing roll, a textured roll, or a sheet by T-die extrusion molding, or by injection molding the olefin-based thermoplastic elastomer. It is preferably used in the case of color forming.

Claims (1)

[Claims] 1. A composition comprising a homopolymer of propylene and / or a random copolymer of propylene and ethylene as a vehicle for a colorant for coloring an olefin-based thermoplastic elastomer in an amount of 20 to 98% by weight. A colorant composition for an olefinic thermoplastic elastomer, comprising: