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:
Dec. 10, 1985
Filed:
Feb. 01, 1984
Toray Industries, Inc., Tokyo, JP;
Abstract
A method of producing a semipermeable membrane comprising a polymeric material based upon a trisisocyanurate structure ##STR1## wherein, R.sub.1, R.sub.2 and R.sub.3 are hydrogen or alkyl radicals containing from 2 to 5 carbon atoms, and at least two of R.sub.1, R.sub.2 and R.sub.3 are alkyl radicals having hydroxyl or glycidyl groups. The membrane has high solute rejection, high flux, excellent high pressure resistance, and high temperature resistance and is a highly useful composite membrane for reverse osmosis. In the method, an aqueous solution containing, for example, a reaction product of Formula I is applied to the surface of a porous substrate and is heated at a temperature of about 100.degree. C. to 190.degree. C. to provide a cross-linked structure including a multiplicity of isocyanurate groups on the porous substrate.