# US 11,111,353 B2 · Porous-object production method

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- Number: US 11,111,353 B2
- Document ID: US11111353B2
- Status: Granted
- Kind: B2
- Application number: 16/635,695
- Filed: 2018-06-19
- Published: 2021-05-06
- Granted: 2021-09-07
- Earliest claimed: 2017-08-03
- Assignees: DIC Corporation
- Applicants: DIC Corporation
- Inventors: Yayi Tseng; Kunihiko Komatsuzaki
- Web page: https://patentgrep.com/patent/US11111353B2

## CPC

- C08G 18/7671: {containing only one alkylene bisphenyl group}
- C08J 9/28: by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
- C08G 18/0852: {the solvents being organic}
- C08G 18/3206: {aliphatic}
- C08G 18/42: Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G 18/4854: {Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group}
- C08G 18/664: {with compounds of group C08G18/3203}
- C08G 18/6674: {with compounds of group C08G18/3203}
- C08G 2101/00: Manufacture of cellular products
- C08G 2110/0033: having integral skins
- C08J 2201/0502: the liquid phase being organic
- C08J 2201/0544: the non-solvent being aqueous
- C08J 2375/04: Polyurethanes
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

A method for producing a porous material includes processing a urethane resin composition containing a urethane resin (A) and a solvent (B) by a wet film forming process, in which the solvent (B) satisfies the following conditions: a difference between a Hansen solubility parameter of the solvent (B) (B-HSP) and a Hansen solubility parameter of the urethane resin (A) (A-HSP) is in the range of 3 to 8 (J/cm3)1/2 and a difference between the Hansen solubility parameter of the solvent (B) (B-HSP) and a Hansen solubility parameter of water (W-HSP) is in the range of 31.5 to 38 (J/cm3)1/2. The Hansen solubility parameter of the solvent (B) preferably has a dispersion term (δD) in the range of 15.5 to 21.0 MPa0.5, a polar term (δP) in the range of 7.0 to 14.5 MPa0.5, and a hydrogen bond term (δH) in the range of 4.5 to 11.0 MPa0.5.

## Claims

### Claim 1

A method for producing a porous material, the method comprising processing a urethane resin composition comprising a urethane resin (A) and a solvent (B) by a wet film forming process,
the solvent (B) satisfying the following conditions:
a difference between a Hansen solubility parameter of the solvent (B) (B-HSP) and a Hansen solubility parameter of the urethane resin (A) (A-HSP) is in the range of 3 to 8 (J/cm3)1″2 and
a difference between the Hansen solubility parameter of the solvent (B) (B-HSP) and a Hansen solubility parameter of water (W-HSP) is in the range of 31.5 to 38 (J/cm3)1/2.

### Claim 2 (depends on 1)

The method for producing a porous material according to claim 1, wherein the Hansen solubility parameter of the solvent (B) has a dispersion term (δD) in the range of 15.5 to 21.0 MPa0.5, a polar term (δP) in the range of 7.0 to 14.5 MPa0.5, and a hydrogen bond term (δH) in the range of 4.5 to 11.0 MPa0.5.

### Claim 3 (depends on 1)

The method for producing a porous material according to claim 1, wherein the solvent (B) is N,N,2-trimethylpropionamide and/or N,N-dimethylacrylamide.

### Claim 4 (depends on 2)

The method for producing a porous material according to claim 2, wherein the solvent (B) is N,N,2-trimethylpropionamide and/or N,N-dimethylacrylamide.