Hydrogenated block copolymer and composition comprising same

Patent metadata

Field	Value
Publication number	US-9321874-B2
Application number	US-201213984941-A
Country	US
Kind code	B2
Filing date	Feb 14, 2012
Priority date	Feb 14, 2011
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A hydrogenated block copolymer having two or more polymer blocks (a) each with a structural unit derived from an aromatic vinyl compound and one or more polymer blocks (b) each with structural units derived from isoprene and 1,3-butadiene, the hydrogenated block copolymer having a crystallization peak temperature of −3 to 15° C.

First claim

The invention claimed is:

1. A hydrogenated block copolymer, which is obtained by hydrogenating a block copolymer comprising:
two or more polymer blocks (a) each comprising a structural unit derived from an aromatic vinyl compound, and
one or more polymer blocks (b) each comprising structural units derived from isoprene and 1,3-butadiene,
wherein a mass ratio of the structural unit derived from isoprene to the structural unit derived from 1,3-butadiene is in a range from 48/52 to 42/58,
wherein the hydrogenated block copolymer has a crystallization peak temperature of 2 to 15° C. and a crystal melting heat quantity of 17 to 25 mJ/mg, wherein the crystallization peak temperature is defined as a peak top temperature of an exothermic peak observed when a temperature of a sample is increased from 30° C. to 150° C. at a rate of temperature increase of 10° C./min and then the sample is cooled to −100° C. at a rate of temperature decrease of 10° C./min, the peak top temperature being measured with a differential scanning calorimeter, and
wherein a content of the polymer blocks (a) in the hydrogenated block copolymer is 20 to 34 mass %.

2. The hydrogenated block copolymer of claim 1 , wherein a content of the polymer blocks (a) in the hydrogenated block copolymer is 25 to 33 mass %.

3. A thermoplastic elastomer composition, comprising:
the hydrogenated block copolymer (A) of claim 1 ; and
a thermoplastic resin (B).

4. A thermoplastic elastomer composition, comprising:
the hydrogenated block copolymer (A) of claim 1 ;
a thermoplastic resin (B); and
a softener for a rubber (C).

5. The thermoplastic elastomer composition of claim 4 , wherein in 100 parts by mass of a total of the hydrogenated block copolymer (A), the thermoplastic resin (B), and the softener for a rubber (C), a content of the hydrogenated block copolymer (A) is 50 to 80 parts by mass, a content of the thermoplastic resin (B) is 5 to 30 parts by mass, and a content of the softener for a rubber (C) is 10 to 45 parts by mass.

6. The thermoplastic elastomer composition of claim 4 , wherein the thermoplastic resin (B) comprises a polystyrene-based resin (B′).

7. A thermoplastic elastomer composition, comprising:
the hydrogenated block copolymer (A) of claim 2 ; and
a thermoplastic resin (B).

8. A thermoplastic elastomer composition, comprising:
the hydrogenated block copolymer (A) of claim 2 ;
a thermoplastic resin (B); and
a softener for a rubber (C).

9. The thermoplastic elastomer composition of claim 8 , wherein in 100 parts by mass of a total of the hydrogenated block copolymer (A), the thermoplastic resin (B), and the softener for a rubber (C), a content of the hydrogenated block copolymer (A) is 50 to 80 parts by mass, a content of the thermoplastic resin (B) is 5 to 30 parts by mass, and a content of the softener for a rubber (C) is 10 to 45 parts by mass.

10. The thermoplastic elastomer composition of claim 5 , wherein the thermoplastic resin (B) comprises a polystyrene-based resin (B′).

11. The hydrogenated block copolymer of claim 1 , wherein the hydrogenated block copolymer has:
a crystallization peak temperature of 2 to 13° C.;
an amount of 1,4-bonds formed from the structural units derived from isoprene and butadiene of 90 to 95%; and
96 to 100% of carbon-carbon double bonds derived from isoprene and butadiene are hydrogenated.

Assignees

• Jogo Yosuke
• Shachi Kenji
• Moriguchi Nobuhiro
• Kuraray Co

Inventors

• Jogo Yosuke
• Shachi Kenji
• Moriguchi Nobuhiro

Classifications

• C08F297/046

  polymerising vinyl aromatic monomers and isoprene, optionally with other conjugated dienes · CPC title

• C08L53/025 Primary

  modified · CPC title

• C08F293/00 Primary

  Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule (on to polymers modified by introduction of unsaturated end groups C08F290/02) · CPC title

• C08L25/08

  Copolymers of styrene (C08L29/08, C08L35/06, C08L55/02 take precedence) · CPC title

• C08L91/00

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title