Thermoplastic resin composition, method for producing same and molded body

Patent metadata

Field	Value
Publication number	US-11299608-B2
Application number	US-201816330400-A
Country	US
Kind code	B2
Filing date	Jan 19, 2018
Priority date	Jan 23, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

Disclosed is a thermoplastic resin composition designed to, even when containing a filler, reduce a trade-off between stiffness and impact resistance to achieve a balance between impact resistance and stiffness, a method for producing the same, and a molded body. The thermoplastic resin composition is obtained by blending a polyolefin resin, a polyamide resin containing an inorganic filler, and a modified elastomer having a reactive group that reacts with the polyamide resin, wherein the polyolefin resin has a number-average molecular weight of 350,000 or more, and the polyamide resin has a structure in which a hydrocarbon group interposed between adjacent amide bonds in a main chain has 5 or less straight chain carbon atoms. The molded body is composed of the thermoplastic resin composition. The method for producing the thermoplastic resin composition includes melt-kneading a polyolefin resin and a melt-kneaded product of a polyamide resin and a modified elastomer.

First claim

The invention claimed is:

1. A thermoplastic resin composition obtained by blending a polyolefin resin, a polyamide resin containing an inorganic filler, and a modified elastomer having a reactive group that reacts with the polyamide resin, wherein
the polyolefin resin is a propylene homopolymer and the propylene homopolymer has a number-average molecular weight of 500,000 or more,
the polyolefin resin has no reactive group that reacts with the polyamide resin,
the polyamide resin is a polyamide 6,
the inorganic filler is a layered silicate which has silicate layers,
the silicate layers and the polyamide resin have affinity for each other or bind together, and
the modified elastomer is a maleic anhydride-modified ethylene-butene copolymer.

2. The thermoplastic resin composition according to claim 1 , further comprising:
a continuous phase (A) containing the polyamide resin,
a dispersed phase (B 1 ) containing the modified elastomer, wherein the dispersed phase (B 1 ) is dispersed in the continuous phase (A),
a dispersed phase (B 2 ) containing the polyolefin resin, wherein the dispersed phase (B 2 ) is dispersed in the continuous phase (A), and
the inorganic filler (C) is dispersed in the continuous phase (A).

3. A molded body comprising the thermoplastic resin composition according to claim 1 .

4. A method for producing the thermoplastic resin composition according to claim 1 , comprising:
melt-kneading the polyolefin resin and a melt-kneaded product of the polyamide resin containing an inorganic filler and the modified elastomer.

5. The thermoplastic resin composition according to claim 1 , wherein the polyolefin resin has a number-average molecular weight of 520,000 or more.

6. The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition is obtained by melt-kneading a melt-kneaded product and the polyolefin resin,
wherein the melt-kneaded product is obtained by melt-kneading the polyamide resin and the modified elastomer.

7. A thermoplastic resin composition comprising a polyolefin resin, a polyamide resin containing an inorganic filler, and a modified elastomer having a reactive group that reacts with the polyamide resin, wherein
the polyolefin resin is a propylene homopolymer and the propylene homopolymer has a number-average molecular weight of 500,000 or more,
the polyolefin resin has no reactive group that reacts with the polyamide resin,
the polyamide resin is a polyamide 6,
the inorganic filler is a layered silicate which has silicate layers,
the silicate layers and the polyamide resin have affinity for each other or bind together, and
the modified elastomer is a maleic anhydride-modified ethylene-butene copolymer.

Assignees

• Toyota Boshoku Kk

Inventors

• Kato Keisuke

Classifications

• C08J2377/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08J2377/10 takes precedence) · CPC title

• C08L77/00 Primary

  Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers · CPC title

• C08J2423/26

  modified by chemical after-treatment · CPC title

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• C08L25/00

  Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers · CPC title