Patent ID: 9745408
Date: 2017-08-29
CPC Classifications: C08G

Claim:
1. A rigid foam having increased flame retardance, said rigid foam comprising the reaction product of: an isocyanate component having isocyanate functional groups and comprising from about 65 to about 75 parts by weight of a polymethylene polyphenyl polyisocyanate, from about 25 to about 35 parts by weight of a 4,4′-diphenylmethane diisocyanate, and from about 0.1 to about 10 parts by weight of a 2,4′-diphenylmethane diisocyanate, each based on 100 parts by weight of said isocyanate component; and an isocyanate-reactive component having isocyanate-reactive functional groups and comprising a Mannich polyol; in the presence of; wherein said isocyanate component, isocyanate-reactive component, isocyanurate catalyst component, and carbodiimide catalyst component form a mixture prior to reacting to form said rigid foam with said mixture having a rise time of no greater than about 3 seconds.