Crystallizable thermoplastic resin composition and molded article

Patent metadata

Field	Value
Publication number	US-10619031-B2
Application number	US-201414899230-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Jun 21, 2013
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

Provided is resin molded articles having large elastic modulus, and good appearance. A thermoplastic resin composition contains 80 to 120 parts by weight of a carbon fiber and 0.1 to 3.0 parts by weight of a black colorant, per 100 parts by weight of a (A) crystallizable thermoplastic resin which shows a semicrystallization time (ST (P)) of 20 to 500 seconds, wherein the semicrystallization time is measured by depolarization photometry, under conditions that a sample melting temperature is 20 to 40° C. higher than a melting point of the crystallizable thermoplastic resin, a sample melting time is 3 minutes, and an oil bath temperature for crystallization is 140° C.

First claim

The invention claimed is:

1. A thermoplastic resin composition comprising 80 to 120 parts by weight of a carbon fiber and 0.1 to 3.0 parts by weight of a black colorant, per 100 parts by weight of a (A) crystallizable thermoplastic resin which shows a semicrystallization time of 20 to 500 seconds, wherein the semicrystallization time is measured by depolarization photometry, under conditions that a sample melting temperature is 20 to 40° C. higher than a melting point of the crystallizable thermoplastic resin, a sample melting time is 3 minutes, and an oil bath temperature for crystallization is 140° C.,
wherein the carbon fiber comprises polyacrylonitrile-based carbon fiber,
wherein the (A) crystallizable thermoplastic resin is a xylylenediamine-based polyamide resin which comprises diamine constitutive units consisting essentially of 70 to 100% by mol of metaxylylenediamine and 30 to 0% by mol of paraxylylenediamine, and 70% by mol or more of a dicarboxylic acid constitutive unit being derived from adipic acid,
wherein the carbon fiber is about 43.7 to about 54.5% by weight of the thermoplastic resin composition,
wherein the total content of the crystallizable thermoplastic resin and the carbon fiber accounts for 90% by weight or more of the thermoplastic resin composition,
wherein the black colorant is carbon black,
wherein the carbon black has a DBP absorption of 30 to 300 cm 3 /100 g,
wherein the carbon black comprises furnace black, and
wherein the thermoplastic resin composition is free from a flame retarder.

2. The thermoplastic resin composition of claim 1 , wherein the polyamide resin contains an aromatic ring in a molecule thereof, and has a ratio of carbon atoms composing the aromatic ring, relative to the polyamide resin molecule, of 30% by mol or larger.

3. The thermoplastic resin composition of claim 1 , wherein 30% by weight or more of the carbon fiber, contained in the thermoplastic resin composition, is assignable to the polyacrylonitrile-based carbon fiber.

4. The thermoplastic resin composition of claim 1 , wherein a quantity of talc, contained in the thermoplastic resin composition, is 1% by weight or less relative to the thermoplastic resin composition.

5. The thermoplastic resin composition of claim 1 , wherein the carbon fiber shows a tensile strength of 5.0 GPa or smaller, when measured at 23° C. in accordance with JIS R7601.

6. A molded article obtained by molding the thermoplastic resin composition described in of claim 1 .

7. The thermoplastic resin composition of claim 2 , wherein a quantity of talc, contained in the thermoplastic resin composition, is 1% by weight or less relative to the thermoplastic resin composition.

8. The thermoplastic resin composition of claim 1 , the composition being free from dyes.

Assignees

• Mitsubishi Eng Plastics Corp

Inventors

• Takano Takahiro
• Yamada Ryusuke

Classifications

• C08K7/04

  inorganic · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08K3/04

  Carbon · CPC title

• C08G69/265

  from at least two different diamines or at least two different dicarboxylic acids · CPC title

• C08J2377/00

  Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers · CPC title