Storage stable polyisocyanates characterized by allophanate link

Details Storage stable polyisocyanates characterized by allophanate link Storage stable polyisocyanates characterized by allophanate link

1987-01-23

1988-04-19

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521155, 521157, 521170, 521172, 521174, 528 48, 528 49, 528 55, 528 56, 528 76, 528 80, 528 85, C08C 1830

Patent

active

047389915

ABSTRACT:
Organic polyisocyanates characterized by allophanate linkages are prepared by reacting an organic polyisocyanate with a mono- or polyhydric compound in the presence of an organo metal catalyst. The catalyst is then deactivated using a compound such as an inorganic acid, organic acid, organic chloroformate or an organic acid chloride. The isocyanates are useful in preparing polyurethane foams.

REFERENCES:
patent: 3769318 (1973-10-01), Windemuth et al.
patent: 4160080 (1979-07-01), Koenig et al.
patent: 4177342 (1979-12-01), Bock et al.

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