Block copolymer

Patent metadata

Field	Value
Publication number	US-10308751-B2
Application number	US-201414915107-A
Country	US
Kind code	B2
Filing date	Sep 1, 2014
Priority date	Aug 30, 2013
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

A block copolymer, a method for preparing a block copolymer, a resin composition, and a film are provided. The block copolymer can be useful in inhibiting complete separation of the hard segment even under a severe high-temperature condition by increasing the chemical cross-linking density around the hard segment without causing an increase in glass transition temperature of the hard segment, thereby maintaining high-temperature durability.

First claim

What is claimed is:

1. A cured product of a curable resin composition, wherein the curable resin composition comprises a block copolymer comprising:
a hard segment having a glass transition temperature of 25° C. or more; and
a soft segment having a glass transition temperature of 10° C. or less,
wherein the soft segment comprises a polymerization unit derived from a cross-linkable monomer, and
the polymerization unit derived from the cross-linkable monomer has a higher concentration in a region adjacent to the hard segment than in a region which is not adjacent to the hard segment,
wherein the cured product of the curable resin composition has a phase-separated structure comprising a shell layer and a spherical domain, wherein the shell layer comprises the soft-segment, and the spherical domain comprises the hard segment, and the shell layer has a higher cross-linking density in a region adjacent to the hard segment than in a region which is not adjacent to the hard segment.

2. The cured product of claim 1 , wherein the hard segment comprises a polymerization unit derived from a methacrylic monomer.

3. The cured product of claim 1 , wherein the soft segment comprises polymerization units derived from an acrylic monomer and a cross-linkable monomer.

4. The cured product of claim 1 , wherein the glass transition temperature of the hard segment is in a range of 30° C. to 200° C.

5. The cured product of claim 1 , wherein the glass transition temperature of the soft segment is in a range of −80° C. to 0° C.

6. The cured product of claim 1 , wherein the cross-linkable monomer comprises at least one functional group selected from the group consisting of a hydroxyl group, a carboxyl group, an epoxy group, a glycidyl group, an isocyanate group, an amide group, an amino group, and an alkoxysilyl group.

7. The cured product of claim 1 , wherein the content of the hard segment is in a range of 5 to 25% by weight, based on the total weight of the block copolymer.

8. The cured product of claim 1 , which has a number average molecular weight of 5,000 to 500,000.

9. The cured product of claim 1 , which has a molecular weight distribution of greater than 1 and 3 or less.

10. A film comprising the cured product of claim 1 .

11. The film of claim 10 , wherein the film is a pressure-sensitive adhesive film.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Jeong Ae
• Kim Su Jeong
• Yoon Sung Soo
• Lee Min Ki
• Kim Kee Young
• Chi Han Na
• Hong Sang Hyun
• Bae Jeong Sik

Classifications

• C08J2353/00

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

• C08F2438/01

  Atom Transfer Radical Polymerization [ATRP] or reverse ATRP · CPC title

• C09D153/00

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

• C08F293/005 Primary

  using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent · CPC title

• C09J153/00

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