Isocyanate terminated quasi-prepolymers useful for preparing ure

Details Isocyanate terminated quasi-prepolymers useful for preparing ure Isocyanate terminated quasi-prepolymers useful for preparing ure

1985-11-25

1987-01-13

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521902, 528 83, C08G 1814

Patent

active

046365303

ABSTRACT:
Flame retardant intumescent polyisocyanurate rigid foams are prepared by trimerizing isocyanate-terminated quasi-prepolymers containing predominately urethane linkages prepared by reacting an organic polyisocyanate with polyester polyols derived from the transesterification of dimethyl terephthalate process residue. The solvent blown rigid polyisocyanurate foams have exceptionally low friability.

REFERENCES:
patent: 4346229 (1982-08-01), Derr et al.
patent: 4444918 (1984-04-01), Brennan

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