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:
Jan. 23, 1990
Filed:
Nov. 18, 1986
Applicant:
Inventor:
Thord G Hassler, Helsingborg, SE;
Assignee:
W. R. Grace AB, Helsingborg, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H / ;
U.S. Cl.
CPC ...
1621643 ; 1621646 ; 1621682 ; 525374 ; 525377 ; 525383 ; 525385 ;
Abstract
A water soluble thermosetting resin useful as a promoter for paper sizing is described. Polyallylamine or a modified polyallyamine is reacted with epichlorohydrin and/or formaldehyde. The formaldehyde may be reacted with the polyallylamine in the presence of dicyandiamide, urea or an ammonium salt or mixtures thereof.