Intumescent flexible polyurethane foam

Details Intumescent flexible polyurethane foam Intumescent flexible polyurethane foam

1980-10-24

1983-02-15

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521113, 521115, 521118, 521123, C08G 1814

Patent

active

043742076

ABSTRACT:
Flexible, resilient, polyurethane foam having improved flame retardancy and intumescent properties is prepared from a reaction mixture comprising a polyether polyol, an organic polyisocyanate, a blowing agent, a surfactant, a catalyst, a flame retardant, and hydrated alumina. Alternatively, the mixture also comprises a low-viscosity linear polyester.
The hydrated alumina is predispersed in a mixture comprising flame retardant and low-viscosity linear polyester, and alternatively a char former and a fugitive viscosity modifier.

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patent: 4230822 (1980-10-01), Murch et al.

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