Heat-resistant SAN resin, method for manufacturing same, and heat-resistant ABS resin composition comprising same

Patent metadata

Field	Value
Publication number	US-9458313-B2
Application number	US-201414764555-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Jul 2, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

Disclosed are a heat-resistant SAN resin, a method of preparing the same, and a heat-resistant ABS resin composition comprising the same. More particularly, a heat-resistant SAN resin comprising 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound (except for α-methylstyrene), the heat-resistant SAN resin having a degree of branching of 0.40 to 0.60, a molecular weight of 90,000 to 150,000 g/mol, and a glass transition temperature (Tg) of 124 to 140° C., a method of preparing the same, and a heat-resistant ABS resin composition comprising the same are disclosed.

First claim

What is claimed is:

1. A method of preparing a heat-resistant styrene-acrylonitrile (SAN) resin, the method comprising:
polymerizing by adding 0.05 to 0.5 parts by weight of a multifunctional initiator to 100 parts by weight of a monomer mixture comprising 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound other than α-methylstyrene, and
removing by volatilizing unreacted monomers and a solvent under a pressure of 25 torr or less after the polymerization.

2. The method according to claim 1 , wherein the multifunctional initiator comprises 2 to 4 functional groups.

3. The method according to claim 2 , wherein the functional groups are peroxide groups.

4. The method according to claim 2 , wherein the multifunctional initiator is 2,2-bis(4,4-di-t-butylperoxy cyclohexyl) propane, 1,1-bis(t-butylperoxy) cyclohexane, and a mixture thereof.

5. The method according to claim 1 , wherein the polymerization is performed at 95 to 105° C.

6. The method according to claim 1 , wherein the polymerization is performed for 6 to 8 hours.

7. The method according to claim 1 , wherein the polymerization is continuous bulk polymerization.

8. The method according to claim 1 , wherein the removing is performed at 200 to 250° C.

9. A heat-resistant acrylonitrile butadiene styrene (ABS) resin composition comprising:
an ABS resin; and
a heat-resistant styrene-acrylonitrile (SAN) resin,
wherein the heat-resistant SAN resin has a degree of branching of 0.40 to 0.60, a molecular weight of 90,000 to 150,000 g/mol, and a glass transition temperature (Tg) of 124 to 140° C.,
wherein the heat-resistant SAN resin comprises 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound other than α-methylstyrene, and
wherein the heat-resistant SAN resin comprises 0.1 to 0.8 wt % of an oligomer.

10. The heat-resistant ABS resin composition according to claim 9 , wherein the heat-resistant ABS resin composition comprises 10 to 40 wt % of an ABS resin and 60 to 90 wt % of the heat-resistant SAN resin.

11. The heat-resistant ABS resin composition according to claim 9 , wherein the heat-resistant ABS resin composition comprises a hindered phenolic antioxidant, a phosphorous antioxidant, or a mixture thereof.

12. A heat-resistant ABS resin composition comprising:
an acrylonitrile butadiene styrene (ABS) resin; and
a heat-resistant styrene-acrylonitrile (SAN) resin,
wherein the heat-resistant SAN resin has a degree of branching of 0.40 to 0.60, a molecular weight of 90,000 to 150,000 g/mol, and a glass transition temperature (Tg) of 124 to 140° C.,
wherein the heat-resistant SAN resin comprises 60 to 75 wt % of α-methylstyrene, 25 to 35 wt % of a vinyl cyan compound, and 0 to 10 wt % of an aromatic vinyl compound other than α-methylstyrene, and
wherein the heat-resistant ABS resin composition comprises 10 to 40 wt % of an ABS resin and 60 to 90 wt % of the heat-resistant SAN resin.

Assignees

• Lg Chemical Ltd

Inventors

• Seo Jae Bum
• Han Chang Hun
• Lee Dae Woo
• Park Jung Tae
• Choi Eun Jung
• Kang Byoung Il
• Sung Da Eun
• Kim Gyu Sun

Classifications

• C08L25/12 Primary

  with unsaturated nitriles · CPC title

• C08F212/12

  Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical · CPC title

• C08L55/02

  ABS [Acrylonitrile-Butadiene-Styrene] polymers · CPC title

• C08F4/36

  Per-compounds with more than one peroxy radical · CPC title

• C08F2/02

  Polymerisation in bulk · CPC title