Thermoplastic resin composition and molded product obtained by applying same

Patent metadata

Field	Value
Publication number	US-10106677-B2
Application number	US-201515309719-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Nov 28, 2014
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

The present invention relates to a thermoplastic resin composition with excellent chemical resistance and, more specifically, to a resin composition for blow molding and a molded product obtained by molding the same, the composition maintaining the balance of flowability and impact resistance and improving chemical resistance by controlling the glass transition temperature (Tg) and the weight average molecular weight (Mw) of an α-methylstyrene (AMS)-based heat-resistant resin in a copolymer of vinyl cyanide compound-rubbery polymer-aromatic vinyl compound, having reinforced heat resistance, particularly, in an acrylonitrile-butadiene-styrene (ABS) copolymer resin. According to the present invention, an ABS resin composition for blow molding, having excellent chemical resistance while maintaining the balance of flowability, impact resistance and heat resistance to be of at least the same level, and a molded product obtained by applying the same can be obtained.

First claim

The invention claimed is:

1. A molded product molded by blow molding process using a thermoplastic resin composition,
wherein the thermoplastic resin composition comprises:
25 to 50% by weight of a graft copolymer resin of a vinyl cyanide compound-rubbery polymer-aromatic vinyl compound; and
30 to 75% by weight of α-methylstyrene-based heat-resistant resin having a glass transition temperature (Tg) of 125° C. or more and a weight average molecular weight (Mw) of 150,000 to 250,000,
wherein the molded product has flow index of 0.5 to 3.0 g/10 min in accordance with ASTM D1238: [provided extrusion output (g) per 10 minutes is measured at 220° C. under a load of 10 kg].

2. The molded product according to claim 1 , characterized in that said graft copolymer resin is the ABS resin wherein acrylonitrile and styrene are grafted to a butadiene rubbery polymer.

3. The molded product according to claim 1 , characterized in that said graft copolymer resin has the rubbery polymer content of 40 to 60% by weight.

4. The molded product according to claim 1 , characterized in that said heat-resistant resin is prepared by emulsion polymerization.

5. The molded product according to claim 1 , characterized in that said thermoplastic resin composition further comprises 0 to 30% by weight of α-methylstyrene-based heat-resistant resin having a glass transition temperature of less than 125° C. and a weight average molecular weight of 80,000 to less than 150,000.

6. The molded product according to claim 5 , characterized in that said α-methylstyrene-based resin is prepared by bulk polymerization.

7. The molded product according to claim 1 , characterized in that said thermoplastic resin composition further comprises 0 to 10% by weight of N-phenylmaleimide (PMI)-based heat-resistant resin.

8. The molded product according to claim 1 , wherein the molded product has elongation retention of 40% or more in accordance with ASTM D638-10: [provided said elongation retention (%)=(elongation after application of thinner/elongation before application of thinner)×100].

9. A molded product molded by blow molding process using a thermoplastic resin composition,
wherein the thermoplastic resin composition comprises:
25 to 50% by weight of a graft copolymer resin of a vinyl cyanide compound-rubbery polymer-aromatic vinyl compound; and
30 to 75% by weight of α-methylstyrene-based heat-resistant resin having a glass transition temperature (Tg) of 125° C. or more and a weight average molecular weight (Mw) of 150,000 to 250,000,
wherein the molded product has impact strength of 20 to 35 kg·cm/in accordance with ASTM D256: [provided the specimen with the formed notch and a thickness of ¼″ (6.35 mm) is applied].

10. A molded product molded by blow molding process using a thermoplastic resin composition,
wherein the thermoplastic resin composition comprises:
25 to 50% by weight of a graft copolymer resin of a vinyl cyanide compound-rubbery polymer-aromatic vinyl compound; and
30 to 75% by weight of α-methylstyrene-based heat-resistant resin having a glass transition temperature (Tg) of 125° C. or more and a weight average molecular weight (Mw) of 150,000 to 250,000,
wherein the molded product has a heat deflection temperature of 100 to 120° C. in accordance with ASTM D648-07: [provided the specimen with a thickness of ¼″ (6.35 mm) is applied under a load of 18.6 kgf/cm 2 and 120/hr].

Assignees

• Lg Chemical Ltd

Inventors

• Lee Soo Kyeong
• Ryoo Seung Cheol
• Kim Seong Lyong

Classifications

• C08L35/00

  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 a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers · CPC title

• B29C49/0005

  characterised by the material · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L51/04

  grafted on to rubbers · CPC title

• C08L25/16 Primary

  Homopolymers or copolymers of alkyl-substituted styrenes · CPC title