Composite and production method thereof

Patent metadata

Field	Value
Publication number	US-11274176-B2
Application number	US-201816490844-A
Country	US
Kind code	B2
Filing date	Mar 2, 2018
Priority date	Mar 3, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

A composite including a plurality of block copolymer chains dispersed in a base polymer, the block copolymer chains including a polymer block (A) and a polymer block (B) having lower affinity for the base polymer than that of the polymer block (A), wherein each of the block copolymer chains has the polymer block (A) at two or more locations of the block copolymer chain, and in at least some of the block copolymer chains, the polymer blocks (A) are at least partially located in the base polymer and the polymer blocks (B) are at least partially exposed from the base polymer.

First claim

The invention claimed is:

1. A composite comprising a plurality of block copolymer chains dispersed in a base polymer, the block copolymer chains comprising a polymer block (A) and a polymer block (B) having lower affinity for the base polymer than that of the polymer block (A),
wherein each of the block copolymer chains has the polymer block (A) at two or more locations of the block copolymer chain, and
in at least some of the block copolymer chains, the polymer blocks (A) are at least partially located in the base polymer and the polymer blocks (B) are at least partially exposed from the base polymer.

2. The composite according to claim 1 ,
wherein the polymer block (B) constituting the block copolymer chains is incompatible with the base polymer.

3. The composite according to claim 1 ,
wherein the difference in SP value between the polymer block (A) and the polymer block (B) constituting the block copolymer chains is 1.5 (MPa) 1/2 or more.

4. The composite according to claim 3 ,
wherein the difference in SP value between the polymer block (A) constituting the block copolymer chains and the base polymer is 0.5 (MPa) 1/2 or less.

5. The composite according to claim 1 ,
wherein any glass transition temperature other than the glass transition temperature of the polymer block (A) itself and the glass transition temperature of the polymer block (B) itself is not observed for the block copolymer chains.

6. The composite according to claim 1 ,
wherein the polymer block (B) exposed from the base polymer is swollen by a good solvent for the polymer block (B).

7. A method for producing the composite according to claim 1 , comprising:
mixing the base polymer and the block copolymer chains, so that in at least some of the block copolymer chains, the polymer blocks (A) are located in the base polymer and the polymer blocks (B) are exposed from the base polymer.

8. A method for producing the composite according to claim 1 comprising:
mixing the base polymer and the block copolymer chains under heat to prepare a molten mixture; and
cooling the molten mixture to cause a phase separation, so that in at least some of the block copolymer chains, the polymer blocks (A) are located in the base polymer and the polymer blocks (B) are exposed from the base polymer.

9. A method for producing the composite according to claim 1 , comprising:
preparing a formed body comprising the block copolymer chains dispersed in the base polymer; and
contacting a good solvent for the polymer block (B) with the surface of the formed body to cause a phase separation, so that in at least some of the block copolymer chains, the polymer blocks (A) are located in the base polymer and the polymer blocks (B) are exposed from the base polymer.

10. The method for producing the composite according to claim 7 , further comprising cross-linking the base polymer.

11. The method for producing the composite according to claim 10 , wherein the cross-linking of the base polymer is performed before, simultaneously with, or after the phase separation.

Assignees

• National Institute Of Tech
• Nat Univ Corp Yokohama Nat Univ
• Univ Kyoto
• Nisshinbo Holdings Inc

Inventors

• Sato Takaya
• Arafune Hiroyuki
• Morinaga Takashi
• Honma Saika
• Kamijo Toshio
• Nakano Ken
• Tsujii Yoshinobu

Classifications

• C08J3/005 Primary

  Processes for mixing polymers · CPC title

• C08J3/12

  Powdering or granulating · CPC title

• C08F291/06 Primary

  on to oxygen-containing macromolecules · 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

• C08J2471/02

  Polyalkylene oxides · CPC title