Transparent thermoplastic resin and method of preparing the same

Patent metadata

Field	Value
Publication number	US-10316179-B2
Application number	US-201615541001-A
Country	US
Kind code	B2
Filing date	Nov 9, 2016
Priority date	Nov 30, 2015
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The present invention relates to a transparent thermoplastic resin. More particularly, the present invention relates to a transparent thermoplastic resin, including a random copolymerization block prepared by polymerizing 50 to 80% by weight of an aromatic vinyl compound, 10 to 30% by weight of a vinyl cyanide compound, and 0 to 15% by weight of (meth)acrylic acid alkyl ester; and an aromatic vinyl compound block prepared by polymerizing 1 to 10% by weight of an aromatic vinyl compound, a transparent thermoplastic resin composition including the transparent thermoplastic resin, and methods of preparing the aromatic vinyl compound and transparent thermoplastic resin.

First claim

The invention claimed is:

1. A transparent thermoplastic resin, comprising:
a random copolymerization block prepared by polymerizing 50 to 80% by weight relative to a weight of the transparent thermoplastic resin of an aromatic vinyl compound, 10 to 30% by weight relative to the weight of the transparent thermoplastic resin of a vinyl cyanide compound, and greater than 0% up to 15% by weight relative to the weight of the transparent thermoplastic resin of (meth)acrylic acid alkyl ester; and
an aromatic vinyl compound block prepared by polymerizing 1 to 10% by weight relative to the weight of the transparent thermoplastic resin of an aromatic vinyl compound.

2. The transparent thermoplastic resin according to claim 1 , wherein the aromatic vinyl compound block is bonded to one end or both ends of the random copolymerization block.

3. The transparent thermoplastic resin according to claim 1 , wherein the transparent thermoplastic resin has a refractive index of 1.5675±0.0040.

4. The transparent thermoplastic resin according to claim 1 , wherein the transparent thermoplastic resin has a weight average molecular weight of 185,000 to 300,000 g/mol.

5. A method of preparing a transparent thermoplastic resin, the method comprising:
a first polymerization step of polymerizing 50 to 80% by weight relative to a weight of the transparent thermoplastic resin of an aromatic vinyl compound, 10 to 30% by weight relative to the weight of the transparent thermoplastic resin of a vinyl cyanide compound, and greater than 0% up to 15% by weight relative to the weight of the transparent thermoplastic resin of (meth)acrylic acid alkyl ester;
a second polymerization step of polymerizing by additionally adding 1 to 10% by weight relative to the weight of the transparent thermoplastic resin of the aromatic vinyl compound; and
an obtainment step of obtaining a transparent thermoplastic resin.

6. The method according to claim 5 , wherein the first polymerization step is performed at 100 to 130° C.

7. The method according to claim 5 , wherein the second polymerization step is performed at 130 to 150° C.

8. The method according to claim 5 , wherein each of the first and second polymerization steps is performed for one to four hours.

9. The method according to claim 5 , wherein a total content of the aromatic vinyl compound added during the first and second polymerization steps is 50 to 80% by weight.

10. The method according to claim 5 , wherein the polymerization is bulk polymerization, suspension polymerization, or emulsion polymerization.

11. The method according to claim 5 , wherein the aromatic vinyl compound is one or more selected from the group consisting of styrene, a-methylstyrene, p-methyl styrene, o-ethylstyrene, p-ethylstyrene, and vinyltoluene.

12. The method according to claim 5 , wherein the vinyl cyanide compound is one or more selected from the group consisting of acrylonitrile, methacrylonitrile, and ethacrylonitrile.

13. The method according to claim 5 , wherein the (meth)acrylic acid alkyl ester is one or more selected from the group consisting of (meth)acrylic acid methyl ester, (meth)acrylic acid ethyl ester, (meth)acrylic acid propyl ester, (meth)acrylic acid 2-ethylhexyl ester, (meth)acrylic acid decyl ester, and (meth)acrylic acid lauryl ester.

14. A transparent thermoplastic resin composition, comprising:
greater than 5% by weight and less than 65% by weight relative to a weight of the transparent thermoplastic resin composition of a transparent thermoplastic resin that comprises a random copolymerization block prepared by polymerizing 50 to 80% by weight relative to a weight of the transparent thermoplastic resin of an aromatic vinyl compound, 10 to 30% by weight relative to the weight of the transparent thermoplastic resin of a vinyl cyanide compound, and greater than 0% up to 15% by weight relative to the weight of the transparent thermoplastic resin of (meth)acrylic acid alkyl ester, and an aromatic vinyl compound block prepared by polymerizing 1 to 10% by weight relative to the weight of the transparent thermoplastic resin of an aromatic vinyl compound; and
greater than 35% by weight and less than to 95% by weight relative to the weight of the transparent thermoplastic resin composition of an aromatic vinyl compound-conjugated diene-based compound block copolymer.

15. The transparent thermoplastic resin composition according to claim 14 , wherein the aromatic vinyl compound-conjugated diene-based compound block copolymer comprises 10 to 90% by weight of a conjugated diene-based compound.

16. The transparent thermoplastic resin composition according to claim 14 , wherein the conjugated diene-based compound is one or more selected from the group consisting of 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and chloroprene.

17. The transparent thermoplastic resin composition according to claim 14 , wherein the transparent thermoplastic resin composition has a transparency (haze) of 2.0 or less.

18. The transparent thermoplastic resin composition according to claim 14 , wherein the transparent thermoplastic resin composition has a transmittance (Tt) of 89.9%.

19. The transparent thermoplastic resin composition according to claim 14 , wherein the transparent thermoplastic resin composition has an impact strength of greater than 10.6 kgf·cm/cm.

20. The transparent thermoplastic resin composition according to claim 14 , wherein the (meth)acrylic acid alkyl ester is one or more selected from the group consisting of (meth)acrylic acid methyl ester, (meth)acrylic acid ethyl ester, (meth)acrylic acid propyl ester, (meth)acrylic acid 2-ethylhexyl ester, (meth)acrylic acid decyl ester, and (meth)acrylic acid lauryl ester.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Roo Da
• Choi Jeong Su
• Yoo Keun Hoon
• Lee Won Seok
• Jang Seok Goo
• Park Sang Hoo
• Kim Ho Hoon
• Shim Hyung Seop

Classifications

• C08F212/08

  Styrene · CPC title

• C08F257/02

  on to polymers of styrene or alkyl-substituted styrenes · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08F220/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08L25/12

  with unsaturated nitriles · CPC title