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:
Apr. 21, 2026
Filed:
Apr. 29, 2021
Kemira Oyj, Helsinki, FI;
KEMIRA OYJ, Helsinki, FI;
Abstract
The invention relates to a process for manufacturing wet strength resins, which process comprises a polyamide reactor for amidation, an EHH reactor for epihalohydrin addition, a maturing tank for maturing, a ring-closure and cross-linking reactor for polymerization, and in the process a reaction mixture containing at least EHH and at least polyaminoamide epihalohydrin adduct is manufactured. The process further comprises between the maturing tank and the ring-closure and cross-linking reactor a membrane unit comprising a membrane for dividing the reaction mixture stream from the membrane unit into two streams: a permeate stream comprising un-reacted epihalohydrin and a reject stream comprising EHH/PAIM adduct guided to the ring-closure and cross-linking reactor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile