Thermoplastic polymer, method of preparing thermoplastic polymer, and thermoplastic polymer composition including thermoplastic polymer

Patent metadata

Field	Value
Publication number	US-10508168-B2
Application number	US-201615552238-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Dec 17, 2015
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

The present invention relates to a thermoplastic polymer, a method of preparing the thermoplastic polymer, and a thermoplastic polymer composition including the thermoplastic polymer. More particularly, the present invention provides a thermoplastic polymer reducing the amount of gas generated in high-temperature extrusion and injection-molding processes to improve surface gloss and definition of a resin and provides superior latex stability when a chain-type fatty acid or a salt thereof having a specific branch group or functional group is included as an emulsifier during shell polymerization of a thermoplastic polymer including a core-shell structure, a method of preparing the thermoplastic polymer, and a thermoplastic polymer composition including the thermoplastic polymer.

First claim

The invention claimed is:

1. A thermoplastic rubber polymer comprising one or more selected from the group consisting of:
an unsaturated branched chain fatty acid with a main chain unsaturation degree of 1 to 20;
an unsaturated chain-type fatty acid with a main chain unsaturation degree of 1 to 20 and comprising a functional group;
a salt of the branched chain fatty acid, and
a salt of the fatty acid comprising the functional group,
wherein the functional group is a hydroxyl group or a C1-C10-alkoxy group.

2. The thermoplastic polymer according to claim 1 , wherein the rubber polymer is a conjugated diene-based rubbery polymer.

3. The thermoplastic polymer according to claim 1 , wherein the polymer comprises (a) a core comprising a conjugated diene-based rubbery polymer; and (b) a shell enclosing the core and prepared by polymerizing an aromatic vinyl compound with a vinyl cyanide compound.

4. The thermoplastic polymer according to claim 2 , wherein the conjugated diene-based rubbery polymer is prepared by polymerizing one or more conjugated diene-based compounds selected from the group consisting of 1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3-butadiene, 1,3-pentadiene, isoprene, and chloroprene.

5. The thermoplastic polymer according to claim 3 , wherein the core is comprised in an amount of 30 to 80% by weight and the shell is comprised in an amount of 20 to 70% by weight.

6. The thermoplastic polymer according to claim 3 , wherein the aromatic vinyl compound is one or more selected from the group consisting of styrene, α-methyl styrene, p-methyl styrene, o-methyl styrene, p-ethyl styrene, and vinyl toluene.

7. The thermoplastic polymer according to claim 3 , wherein the vinyl cyanide compound is one or more selected from the group consisting of acrylonitrile, methacrylonitrile, and ethacrylonitrile.

8. The thermoplastic polymer according to claim 1 , wherein the branched chain fatty acid is a chain-type fatty acid comprising 1 to 10 branches composed of a C1 to C10 alkyl group.

9. The thermoplastic polymer according to claim 1 , wherein one or more selected from the group consisting of the branched chain-type fatty acid, the chain-type fatty acid comprising the functional group, and the salts thereof comprised in the rubber polymer is comprised in an amount of 1 to 7 parts by weight based on 100 parts by weight of the rubber polymer.

10. The thermoplastic polymer according to claim 3 , wherein one or more selected from the group consisting of the branched chain fatty acid, the chain-type fatty acid comprising the functional group, and the salts thereof comprised in the shell is comprised in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of a total of monomers comprised in the core and the shell.

11. A method of preparing a thermoplastic polymer, the method comprising:
a step of preparing a rubber polymer by polymerizing a monomer constituting a rubber; or a step of preparing a polymer having a core-shell structure by polymerizing the rubber polymer with a grafting monomer,
wherein the monomer or the rubber polymer is polymerized with one or more selected from the group consisting of:
an unsaturated branched chain fatty acid with a main chain unsaturation degree of 1 to 20;
an unsaturated chain-type fatty acid with a main chain unsaturation degree of 1 to 20 and comprising a functional group;
a salt of the branched chain fatty acid, and
a salt of the fatty acid comprising the functional group.

12. The method according to claim 11 , wherein the monomer constituting the rubber is a conjugated diene-based compound.

13. The method according to claim 11 , wherein the grafting monomer comprises an aromatic vinyl compound and a vinyl cyanide compound.

14. A thermoplastic polymer composition, comprising the thermoplastic polymer according to claim 1 and an aromatic vinyl compound-vinyl cyanide compound copolymer.

15. The thermoplastic polymer composition according to claim 14 , wherein the thermoplastic polymer is comprised in an amount of 10 to 50% by weight and the aromatic vinyl compound-vinyl cyanide compound copolymer is comprised in an amount of 50 to 90% by weight.

16. The thermoplastic polymer composition according to claim 14 , wherein the thermoplastic polymer composition has a surface definition (haze) of 2.5 or less.

17. The thermoplastic polymer composition according to claim 14 , wherein the thermoplastic polymer composition has a surface gloss of 90 or more.

18. A thermoplastic polymer composition comprising:
a thermoplastic rubber polymer comprising one or more selected from the group consisting of an unsaturated branched chain fatty acid with a main chain unsaturation degree of 1 to 20, an unsaturated chain-type fatty acid, a salt of the branched chain fatty acid, and a salt of the fatty acid comprising the functional group, wherein the functional group is a hydroxyl group or a C1-C10-alkoxy group; and
an aromatic vinyl compound-vinyl cyanide compound copolymer.

Assignees

• Lg Chemical Ltd

Inventors

• Suk Jae Min
• Jeong Young Hwan
• Kim Young Min
• Lee Jin Hyoung
• Han Su Jeong
• Kim Yoo Vin
• Chung Sun Haeng

Classifications

• C08F210/12

  with conjugated diolefins, e.g. butyl rubber · CPC title

• C08J3/12

  Powdering or granulating · CPC title

• C08F2/18

  Suspension polymerisation · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title

• C08F212/08

  Styrene · CPC title