Hydrogenated block copolymer and method for producing same

Patent metadata

Field	Value
Publication number	US-9353201-B2
Application number	US-201314405213-A
Country	US
Kind code	B2
Filing date	May 31, 2013
Priority date	Jun 8, 2012
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

The present invention relates to a hydrogenated block copolymer including a polymer block (A) containing a constitutional unit derived from an aromatic vinyl compound and a polymer block (B) containing from 1 to 100% by mass of a constitutional unit (b1) derived from farnesene and from 99 to 0% by mass of a constitutional unit (b2) derived from a conjugated diene other than the farnesene, in which 50 mol % or more of carbon-carbon double bonds in the polymer block (B) are hydrogenated.

First claim

The invention claimed is:

1. A hydrogenated block copolymer comprising a polymer block (A) and a polymer block (B), wherein the polymer block (A) comprises a constitutional unit derived from an aromatic vinyl compound and the polymer block (B) comprises from 1 to 100% by mass of a constitutional unit (b1) derived from farnesene and from 99 to 0% by mass of a constitutional unit (b2) derived from a conjugated diene other than the farnesene, and wherein 50 mol % or more of carbon-carbon double bonds in the polymer block (B) are hydrogenated,
wherein the polymer block (B) comprises a hydrogenation rate of carbon-carbon double bonds of 70 to 100 mol %.

2. The hydrogenated block copolymer according to claim 1 , wherein the farnesene is β-farnesene.

3. The hydrogenated block copolymer according to claim 1 , wherein the polymer block (B) comprises a hydrogenation rate of carbon-carbon double bonds of 90 to 100 mol %.

4. The hydrogenated block copolymer according to claim 1 , wherein the hydrogenated block copolymer comprises a mass ratio [(A)/(B)] of the polymer block (A) to the polymer block (B) of 5/95 to 80/20.

5. The hydrogenated block copolymer according to claim 1 , wherein the hydrogenated block copolymer comprises a peak top molecular weight (Mp) of 4,000 to 1,500,000.

6. The hydrogenated block copolymer according to claim 1 , wherein the hydrogenated block copolymer comprises a molecular weight distribution (Mw/Mn) of 1 to 4.

7. The hydrogenated block copolymer according to claim 1 , wherein the aromatic vinyl compound is styrene.

8. The hydrogenated block copolymer according to claim 1 , wherein the conjugated diene other than the farnesene is at least one compound selected from the group consisting of isoprene, butadiene and myrcene.

9. The hydrogenated block copolymer according to claim 1 , wherein the hydrogenated block copolymer has a loss tangent (tan δ) of 0.1 or more as determined by measuring a dynamic viscoelasticity thereof at a temperature of from −60 to 0° C.

10. A process for producing the hydrogenated block copolymer according to claim 1 , comprising:
obtaining a block copolymer comprising the polymer block (A) and the polymer block (B) by anionic polymerization; and
hydrogenating 50 mol % or more of carbon-carbon double bonds in the polymer block (B) present in the block copolymer.

Assignees

• Kuraray Co
• Amyris Inc

Inventors

• Uehara Yosuke
• Sasaki Hiromitsu

Classifications

• C08F36/22 Primary

  the radical having three or more carbon-to-carbon double bonds · CPC title

• C08F297/04

  polymerising vinyl aromatic monomers and conjugated dienes · CPC title

• C08F8/04

  Reduction, e.g. hydrogenation · CPC title

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• C08F2500/21

  Rubbery or elastomeric properties · CPC title