摘要:
A modified bisimide resin is prepared by copolymerizing a bisimide monomer and a cyclic triene. The copolymerization of a bisimide with a cyclic triene such as 1,2,4-trimethylenecyclohexane provides a modified bisimide having good fracture toughness.
摘要:
A process and catalyst are disclosed for the catalyzed reaction of an organometallic reagent with a reactive halide in the presence of a diphosphine complex of a nickel carboxylate or sulfonate. The process can be employed in the synthesis of aromatic compounds such as bisbenzocyclobutenes.
摘要:
A composition comprising a 1,2-dialkylidenecyclobutane such as 1,2-dimethylenecyclobutane, a bisbenzocyclobutene and a polyimide such as a bismaleimide can be thermally cured to a tough copolymer having a high glass transition temperature.
摘要:
A composition comprising a curable epoxy resin, a reactive diluent, a curing agent for the epoxy resin, and an isocyanate compound is stable at room temperature for extended periods of time and cures to form a part which has good high-temperature properties.
摘要:
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.
摘要:
A process is described for purification of a reaction product mixture of cyclobuteno-4-haloarene containing aliphatic halide impurities. The product mixture is contacted with a tertiary amine under conditions effective for conversion of aliphatic halides to soluble species which can be removed from the mixture by extraction. The process can be used, for example, in the recovery of 4-bromobenzocyclobutene from a reaction product mixture containing aliphatic halide by-products such as 1-bromo-2-(2-bromoethyl)benzene.
摘要:
A composition is disclosed comprising a bisbenzocyclobutene, a bismide and a free radical inhibitor. The free radical inhibitor is preferably phenothiazine. The presence of the free radical inhibitor enhances the toughness and high-temperature viscosity stability of bisbenzocyclobutene/bismaleimide copolymers.
摘要:
An epoxy resin composition containing a cationic curing agent and a cure-retarding amount of a diarylamine. The diarylamine lengthens the pot life of the epoxy-curing agent composition.
摘要:
The present invention is particularly directed to a coating composition exhibiting faster cure times and improved physical properties which comprise (1) from about 60% to about 95% by weight of a saturated epoxy resin, (2) from about 5% to about 40% by weight of triglycidyl cyanurate (or triglycidyl thiocyanurate) and (3) a curing amount of an epoxy curing agent, preferably an amino-containing curing agent.
摘要:
Cure of an epoxy resin by an aliphatic amine is accelerated by a calcium sulfonate or calcium hydrocarbyl sulfate salt. The calcium salt is preferably a salt of a detergent-range sulfonic acid or hydrocarbyl sulfuric acid which is soluble in either the amine or the epoxy resin.