Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1978-12-11
1980-10-21
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525334, 525375, C08f27902
Patent
active
042295505
ABSTRACT:
Vinyl polybutadiene maleimide prepolymers which are peroxide curable are provided. The prepolymers are formed from the reaction product of a vinyl polybutadiene providing pendant vinyl groups and a maleimide and, more particularly, a mixture of aliphatic maleimides with cycloaliphatic or aromatic maleimides in combination with a peroxide-free radical initiator. The prepolymer is a vinyl polybutadiene backbone structure having grafted maleimide polymers forming cross-linking between polybutadiene backbone segments. The resultant prepolymer can be subsequently cured to a hard resin by heating in the presence of a peroxide-free radical initiator to form cross-linking between vinyl polybutadiene structures through the pendant vinyl groups. The resultant hard resin provides strength retention at elevated temperatures and exhibits a flexibility and strength without being brittle.
REFERENCES:
patent: 2818405 (1957-12-01), Kovacic
patent: 2925407 (1960-02-01), Goldberg
patent: 2989504 (1961-06-01), Little
patent: 3853815 (1974-12-01), Lubowitz
patent: 3931354 (1976-01-01), Sheppard
patent: 4082817 (1978-04-01), Imaizumi
Buyny Robert A.
Jones Robert J.
O'Rell Michael K.
Vaughan Robert W.
Connors John J.
Michl Paul R.
Nyhagen Donald R.
TRW Inc.
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