Abstract: A masterblend comprising a solvent and a core shell rubber which is formed by dispersing a core shell rubber in the solvent in a dispersion zone is disclosed. The masterblend can then be admixed with a thermosetting resin to form a curable composition.

Abstract: Epoxy resin compositions that include an epoxy resin component that includes at least one epoxy resin and a solvent blend that includes methyl ethyl ketone and glycol methyl ether acetate are provided. The compositions are well-suited for use in the fabrication of prepregs and composite electrical laminates made therefrom.

Abstract: A composition comprising, consisting of, or consisting essentially of: a) tetraphenolic epoxy resin; b) a maleimide; and c) a triazine and/or a cyanate ester is disclosed. Also disclosed is a process for making the composition and its end-uses, such as in electrical laminates and composites.

Abstract: Epoxy resin compositions that include an epoxy resin component that includes at least one epoxy resin and a solvent blend that includes methyl ethyl ketone and glycol methyl ether acetate are provided. The compositions are well-suited for use in the fabrication of prepregs and composite electrical laminates made therefrom.

Abstract: A composition comprising: a) an epoxy resin; and b) a hardener comprising a copolymer of: i) an ethylenically unsaturated anhydride, and ii) a vinyl compound, wherein the vinyl compound is styrene or a styrene derivative and wherein the copolymer has an anhydride content of less than 15 weight percent, based on the total weight of the copolymer, wherein said composition is prepared from a halogen-containing compound, and uses thereof, are disclosed.

Abstract: Epoxy resins and mixtures of polyphenolic compounds which comprise cycloaliphatic moieties, processes for the production thereof and mixtures and cured products which comprise these resins and/or mixtures.

Abstract: A curable laminate epoxy composition comprising (a) an epoxy resin; (b) an amphiphilic block copolymer containing at least one epoxy resin miscible block segment and at least one epoxy resin immiscible block segment; wherein the immiscible block segment comprises at least one polyether structure provided that the polyether structure of said immiscible block segment contains at least one or more alkylene oxide monomer units having at least four carbon atoms; such that when the epoxy resin composition is cured, the toughness of the resulting cured epoxy resin composition is increased; (c) a curing agent; and (d) a curing catalyst. The amphiphilic block copolymer is preferably an all polyether block copolymer such as a PEO-PBO diblock copolymer or a PEO-PBO-PEO triblock copolymer.

Abstract: A resin composition comprising oligomers having a molar ratio of isocyanurate to oxazolidinone greater than 1:1, wherein the weight average molecular weight of the oligomers is less than or equal to 3000, as measured by gel permeation chromatography. Such resin compositions may be combined with a hardener to form a curable composition. Also disclosed is a process for forming a resin composition, including: reacting diisocyanates to form isocyanurates; reacting isocyanate groups in the isocyanurates and unreacted diisocyanates with an epoxy precursor to form a resin composition comprising oligomers having: a molar ratio of isocyanurate to oxazolidinone greater than 1:1; wherein the weight average molecular weight of the oligomers is less than or equal to 3000, as measured by gel permeation chromatography. Such compositions may be useful in prepregs and laminates.

Abstract: A curable laminate epoxy composition comprising (a) an epoxy resin; (b) an amphiphilic block copolymer containing at least one epoxy resin miscible block segment and at least one epoxy resin immiscible block segment; wherein the immiscible block segment comprises at least one polyether structure provided that the polyether structure of said immiscible block segment contains at least one or more alkylene oxide monomer units having at least four carbon atoms; such that when the epoxy resin composition is cured, the toughness of the resulting cured epoxy resin composition is increased; (c) a curing agent; and (d) a curing catalyst. The amphiphilic block copolymer is preferably an all polyether block copolymer such as a PEO-PBO diblock copolymer or a PEO-PBO-PEO triblock copolymer.

Abstract: Epoxy resins are prepared by dehydrohalogenating the reaction product of a polyhydric phenol with an excess of an epihalohydrin in the presence of a quaternary ammonium compound wherein prior to dehydrohalogenation, the excess epihalohydrin is removed and an organic solvent is added and at least a portion of the dehydrohalogenation is conducted in the presence of added quantities of a quaternary ammonium compound.