Polyisocyanate compositions

Details Polyisocyanate compositions Polyisocyanate compositions

1988-09-16

1989-09-12

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

528 44, 528 60, 528 61, 528 64, 528 65, 528 66, 528 76, 528 77, 528 83, 528 85, C08G 1814

Patent

active

048661031

ABSTRACT:
A polyisocyanate composition, suitable for use in the production of elastomers by the RIM process, said composition being the product of reacting an alcohol and/or thiol having an average hydroxyl and/or thiol functionality of from about 1.5 to about 4 and an average hydroxyl and/or thiol equivalent weight of at least 500 with at least 2 equivalents, per hydroxyl and/or thiol equivalent, of an organic polyisocyanate under such conditions that at least about 20% of the initially formed urethane and/or thiourethane groups are converted to allophanate and/or thioallophanate groups.

REFERENCES:
patent: 4786703 (1988-11-01), Starner et al.
English Abstract of EPA 0093334, 4/83.

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