Patent ID: 9718937
Date: 2017-08-01
CPC Classifications: C08G,C08J

Claim:
1. An inherent flame retardant rigid polyurethane foam synthesized from raw materials comprising: (A) 100 to 105 pbw of polyether polyol and a reactive phosphorus-containing flame retardant, (B) 2.5 to 3.5 pbw of an amine catalyst, (C) 0.8 to 2.5 pbw of a tertiary amine catalyst, (D) 0.8 to 2.5 pbw of a foam stabilizer, (E) 0.5 to 1.5 pbw of a blowing agent, (F) 135 to 150 pbw of isocyanates, and (G) 0.05 to 0.1 pbw of an organo-metallic catalyst; wherein the reactive phosphorus-containing flame retardant is 9,10-dihydro-9-oxa-10-phosphaphenanthrene-4-hydroxybenzyl alcohol.