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. 15, 1980
Filed:
Oct. 06, 1978
Applicant:
Inventors:
Arnold Laqua, Essen, DE;
Ulrich Holtschmidt, Essen, DE;
Eckehard Schamberg, Essen, DE;
Dieter Hellwig, Bochum, DE;
Assignee:
Th. Goldschmidt AG, Essen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08L / ; B32B / ; B32B / ;
U.S. Cl.
CPC ...
260 / ; 428219 ; 428530 ; 525158 ;
Abstract
A method for the preparation of hardenable urea-formaldehyde resins for use in impregnating and coating carrier webs wherein urea and formaldehyde are first reacted in the presence of an aminosulfonic acid and ammonia, additional aminosulfonic acid is added and the mixture is further reacted to adjust the viscosity of the solution and then additional ammonia and urea are added to the reaction mixture and the mixture is further reacted to adjust the viscosity thereof, and wherein a polymer formed from the monomers of the formula ##STR1## in which R.sup.1 =H or CH.sub.3,