"B stageable" high service temperature epoxy thermosets

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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525531, C08G 5906, C08G 5918

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active

047329521

ABSTRACT:
A B stageable thermosettable composition containing at least one polyepoxide and at least one linear anhydride monomer capable of forming a cyclopolymer in situ and processes for the formation of the B stage intermediate and final thermoset having a high service temperature is provided. The composition is useful in a two stage process; first to form a storage stable, flowable thermoplastic B stage intermediate by the free radical initiated vinyl polymerization of the linear anhydride in the liquid composition to a cyclic polymer and secondly to react the cyclic polymer with the poly epoxide to form a crosslinked high service temperature thermoset useful in the preparation of laminates, such as printed circuit boards, adhesives, and encapsulants.

REFERENCES:
patent: 3676398 (1972-07-01), D'Alelio
patent: 3732332 (1973-05-01), Curtis, Jr. et al.
patent: 3770602 (1973-11-01), D'Alelio
D'Alelio, "Esters of Polyepoxides with Polymerizing and Crosslinking Properties", Chemical Abstracts, vol. 81, No. 16, Abstract No. 92377b, 1974.
Nishibuko et al, "Hardenable Epoxy Compositions", Chemical Abstracts, vol. 82, No. 18, Abstract No. 113344b, 1975.
D'Alelio, "Esters of Polyepoxides with Polymerizing and Crosslinking Properties", Chemical Abstracts, vol. 85, No. 18, Abstract No. 124996d, 1976.

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