Patent ID: 7387812

Claim:
A resin composition comprising: (i) an at least bifunctional prepolymer (A) curable under the action of heat selected from the group consisting of an epoxy compound having more than one epoxide group per molecule, an acrylate resin, a polyurethane resin, a cyanate ester resin, a benzoxazine resin, a polyphenylene resin, a polyimide resin and mixtures thereof; (ii) a telechelic elastomer; (iii) a particulate material having an elastomeric core and a thermoplastic shell; and (iv) a photocurable prepolymer (B) selected from the group consisting of: a photocurable prepolymer having an acid value of from 40 to 250 mg KOH/g obtained by the reaction of an unsaturated monobasic acid copolymer resin with a compound which contains an alicyclic epoxy group; a photocurable prepolymer obtained by complete esterification of epoxy groups of an epoxy resin with an α,β-unsaturated carboxylic acid with formation of a first product and subsequent reaction of the first product thus obtained with a saturated or an unsaturated polybasic acid anhydride; a photocurable prepolymer obtained by the reaction of a bisphenol A epoxy resin with epichlorohydrin with formation of a postglycidylated epoxy resin, subsequent complete esterification of the epoxy groups of the postglycidylated epoxy resin with an α,β-unsaturated carboxylic acid with formation of a second product and subsequent reaction of the second product thus obtained with a saturated or an unsaturated polybasic anhydride; and a photocurable prepolymer obtained by the reaction of a bisphenol A epoxy resin with epichlorohydrin with formation of a postglycidylated epoxy resin, mixing of the postglycidylated epoxy resin with a novolak epoxy resin, complete esterification of the mixture with an α,β-unsaturated carboxylic acid with formation of a third product and subsequent reaction of the third product thus obtained with a saturated or unsaturated polybasic acid anhydride.