Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1989-05-30
1990-11-27
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C08F 2240
Patent
active
049736361
ABSTRACT:
A class of benzocyclobutene/bisimide copolymers having superior toughness are disclosed. The copolymers are derived from bisbenzocyclobutene monomers characterized by one of structures ##STR1## in which R is selected from unsubstituted and non-electrophilic substituted phenylene, naphthalenediyl and ##STR2## X is selected from oxygen, sulfur, nitrogen, --CH.sub.2 -- and --C(CH.sub.3).sub.2 --; and X' is selected from O, S, N and --CH.sub.2 --. Also disclosed is a method for preparing a bisbenzocyclobutene/bisimide copolymer having a Tg greater than 200.degree. C. and a Mode I fracture toughness greater than 2 MPa.multidot.m.sup.1/2.
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Schofer Joseph L.
Shell Oil Company
Walker Alex H.
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