Flame retardant mixture for polyurethanes

Details Flame retardant mixture for polyurethanes Flame retardant mixture for polyurethanes

1982-02-16

1983-10-04

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521108, 521109, 521116, 521117, 521132, 521165, 521168, 521171, 521906, 524130, 524710, 528 49, 528 51, 528 53, 528 72, 528 85, C08G 1814

Patent

active

044079818

ABSTRACT:
A composition comprises polyurethane, a two-component flame retardant system consisting of an additive first flame retardant containing organophosphorus, and a second flame retardant containing organochlorine or organobromine.
The composition of the invention may be employed for polyurethane foams, especially rigid foams.
Diminished combustibility for rigid foam is measured by a flame-spread index less than 75 and a smoke developed index less than 450 when subjected to ASTM Test E-84, Surface Burning Characteristics of Building Materials.
Dimethyl methylphosphonate is a representative additive organophosphorus first flame retardant. Trichloroisopropyl alcohol is a representative second flame retardant containing organochlorine.

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patent: 3429837 (1969-02-01), Langrish et al.
patent: 3515565 (1970-06-01), Wood et al.
patent: 3582510 (1971-06-01), Cannelongo
patent: 3684753 (1972-08-01), Franke et al.
patent: 3826762 (1974-07-01), Treadwell
patent: 3933693 (1976-01-01), Priest et al.
patent: 3997449 (1976-12-01), Wilkinson
patent: 4025470 (1977-05-01), Andres et al.
patent: 4194068 (1980-03-01), Miller et al.
patent: 4202779 (1980-05-01), Smith et al.

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