The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 2021
Filed:
Jun. 19, 2018
Dic Corporation, Tokyo, JP;
Yayi Tseng, Osaka, JP;
Kunihiko Komatsuzaki, Osaka, JP;
DIC CORPORATION, Tokyo, JP;
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/cm)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/cm). The Hansen solubility parameter of the solvent (B) preferably has a dispersion term (δD) in the range of 15.5 to 21.0 MPa, a polar term (δP) in the range of 7.0 to 14.5 MPa, and a hydrogen bond term (δH) in the range of 4.5 to 11.0 MPa.