Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1990-09-06
1991-07-16
Schoffer, Joseph L.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428290, 526262, D04H 158, B32B 2712
Patent
active
050324519
ABSTRACT:
A class of benzocyclobutene/bisimide copolymers having superior toughness are disclosed. The copolymers are derived from bisbenzocyclobutene monomers 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.m.sup.1/2.
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Schoffer Joseph L.
Shell Oil Company
Walker Alex H.
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