Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-10-08
1983-05-31
Nielsen, Earl A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525507, 528 73, 528110, 528297, 549539, 549556, 549562, C08G 5914, C08G 1842, C08G 1858
Patent
active
043861911
ABSTRACT:
Reaction of a polyol, acid anhydride and diepoxide, preferably in a single step, yields a prepolymer composition containing a prepolymer containing terminal epoxy and non-terminal, secondary hydroxy groups. Reaction of this prepolymer with a polyisocyanate yields a poly(oxazolidone/urethane) thermoset composition which is essentially free of isocyanurate linkages. The thermoset contains oxazolidone linkages in the backbone of its recurring unit and urethane linkages which are present in a side chain of the unit.
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DiSalvo Anthony L.
Tsai Chung-Chieh
Fennelly Richard P.
Nielsen Earl A.
Stauffer Chemical Company
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