Method for producing thermoplastic resin composition

Patent metadata

Field	Value
Publication number	US-9353259-B2
Application number	US-201414540711-A
Country	US
Kind code	B2
Filing date	Nov 13, 2014
Priority date	Nov 18, 2013
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

Provided is a thermoplastic resin composition having high flame resistance and high fluidity during injection molding, and improved impact resistance in a molded article. A method for producing a thermoplastic resin composition, the method including the step (1) of obtaining a polyester resin mixture by melt-kneading 50 to 80 parts by weight of crystalline polyester resin and 20 to 50 parts by weight of amorphous polyester resin with an extruder, and the step (2) of mixing the polyester resin mixture, a polycarbonate resin, a flame retardant, a dripping inhibitor and a toughening agent, wherein the cylinder temperature of the extruder is 250 to 280° C.

First claim

What is claimed is:

1. A method for producing a thermoplastic resin composition comprising: the step (1) of obtaining a polyester resin mixture by melt-kneading 50 to 80 parts by weight of crystalline polyester resin and 20 to 50 parts by weight of amorphous polyester resin with an extruder; and the step (2) of mixing the polyester resin mixture, polycarbonate resin, a flame retardant, a dripping inhibitor and a toughening agent, wherein the cylinder temperature of the extruder is 250 to 280° C., wherein the amount of heat release (ΔH A ) in the DSC melting curve of the polyester resin mixture is 70% or less with respect to the amount of heat release (ΔH B ) in the DSC melting curve of the crystalline polyester resin (ΔH A /ΔH B ≦0.7).

2. The production method according to claim 1 , wherein the crystalline polyester resin is at least one kind of polyethylene terephthalate and polybutylene terephthalate, and the amorphous polyester resin is at least one kind of PETG resin, PCTG resin and PCTA resin.

3. The production method according to claim 1 , wherein in the step (1), a metal-based catalyst is added in an amount of 0.05 weight % or less with respect to a total of 100 weight % of the crystalline polyester resin and the amorphous polyester resin.

4. The production method according to claim 1 , wherein in the step (2), 10 to 90 parts by weight of polyester resin mixture, 10 to 90 parts by weight of polycarbonate resin, 1 to 40 parts by weight of flame retardant, 0.1 to 1 part by weight of dripping inhibitor and 1 to 20 parts by weight of toughening agent are mixed.

5. The production method according to claim 1 , wherein the molecular weight (Mw) of the polycarbonate resin is 20,000 to 70,000.

Assignees

• Konica Minolta Inc

Inventors

• Yu Yiqiang
• Mamino Masashi
• Kitani Ryuji

Classifications

• C08J2369/00

  Characterised by the use of polycarbonates; Derivatives of polycarbonates · CPC title

• C08L67/02 Primary

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08J2367/00

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

• C08J3/203

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

• C08L2201/02

  Flame or fire retardant/resistant · CPC title