Dual functional additive

Details Dual functional additive Dual functional additive

1984-06-25

1985-08-13

Welsh, Maurice J.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

252182, 524433, 524539, 524590, 525 28, 528 76, 528 83, 528 65, C08K 322

Patent

active

045351104

ABSTRACT:
An isocyanate terminated urethane prepolymer composition having an equivalent ratio of NCO to OH from about 1.2/1 to about 5/1. The isocyanate terminated urethane prepolymer acts as dual functional additive and is prepared by reacting one equivalent weight of a polyol having an average molecular weight of about 600 to about 4,000 and an average functionality of about 2 to about 6 and preferably 2 to 3 and most preferably 2 and 1.2 to 5 equivalents of polyisocyanate and preferably two equivalent weights of polyisocyanate, and preferably a diisocyanate, whereby the reactants combine in a one-step addition process to yield an isocyanate terminated urethane prepolymer of controlled molecular weight to impart improved low shrink, dynamic impact, molding characteristics as measured by viscosity index properties in thermoset polyester resin products, and particularly sheet molding compositions (SMC) by covalently bonding to the polyester resin matrix of the SMC.

REFERENCES:
patent: 4067845 (1978-01-01), Epel et al.
patent: 4424333 (1984-01-01), O'Connor
patent: 4439577 (1984-03-01), O'Connor et al.
Chem. Abstr., vol. 98, 199315h, 1983, (Abstract of EP74,746).

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