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:
Feb. 02, 1999
Filed:
May. 02, 1997
Applicant:
Inventors:
Assignee:
Clariant GmbH, Frankfurt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525 56 ; 525 61 ;
Abstract
A process for preparing poly(vinyl acetals) or poly(vinyl ketals) by reacting poly(vinyl alcohol) with an aldehyde or ketone in the presence of a catalyst which contains acid groups which are chemically bound on a sheet-like support which is insoluble in the reaction medium.