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:
Jul. 03, 1979
Filed:
Jul. 11, 1978
Applicant:
Inventor:
Leopold Golser, Leonding, AT;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J / ;
U.S. Cl.
CPC ...
521158 ; 521118 ; 521136 ; 528 44 ; 528 73 ;
Abstract
Foamed plastics with improved combustion characteristics and good mechanical strength are obtained by condensation of aminoplast precondensates with organic isocyanates in the presence of an acid curing catalyst and an accelerator for polyurethane formation, whereby the precondensate used as starting material is prepared by reacting formaldehyde with urea and/or melamine in a molar ratio of 1.80 to 4.5:1 at pH values of 4 to 9.5, adjusting then the pH to 7.0 to 8.0 and adding urea to obtain a molar ratio offormaldehyde to the total amount of aminoplast forming compound of 1.0-2.1:1.