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. 21, 1992
Filed:
Jul. 21, 1989
Th. Goldschmidt AG, Essen, DE;
Abstract
A method for the preparation of rigid polyurethane and/or polyisocyanurate foams is disclosed. The foams are produced by the reaction of at least difunctional polyisocyanates, a polyol with 3 to 8 hydroxyl groups, said polyol having a hydroxyl number of about 150 to 800, catalysts, blowing agents and foam stabilizers, which are devoid of silicon atoms, as well as, optionally, conventional additives such as flame retardants and chain extenders. The foam stabilizers are copolymers of vinyl monomers and allyl- or methallyl polyoxalkylene ethers. The mole ratio of the monomers is 1:1 to 10:1. The foams thus produced exhibit an improved burning behavior, good surface properties and outstanding thermal insulation effects. The stabilizers increase the solubility of the halocarbon blowing agents in the foaming formulation.