Process for flexibilizing epoxide resins

Abstract

Abstract The invention relates to a process for flexibilizing epoxide resins by the addition of polymers which contain carboxyl groups by adding to the epoxide resins before they are cured, copolymers which are obtained by the conventional polymerization of: (a 1 ) 40 to 87 weight percent of one or several alkyl esters of acrylic and/or methacrylic acid with 1 to 8 carbon atoms in the alkyl radical, (a 2 ) 10 to 40 weight percent of vinyl acetate and/or acrylonitrile, (a 3 ) 1 to 20 weight percent of acrylic, methacrylic and/or itaconic acid, (a 4 ) 1 to 5 weight percent of glycidyl acrylate and/or glycidyl methacrylate, and (a 5 ) 0 to 35 weight percent of acrylic and/or vinyl monomers, which are different from the monomers a 1 to a 4 in the presence of a regulator, which contains mercapto groups and has at least one carboxyl group, and wherein the copolymers have an average molecular weight of 1,000 to 3,000 as measured in a vapor pressure osometer, and the polymers are added in such amounts that 1 to 60 mole percent of the epoxide groups react with the carboxyl groups of the copolymer. The viscosity of the uncured epoxide resin is increased only moderately by the addition of the modifier. The cured, modified epoxide resins have a higher degree of elastification and can be used as adhesives which adhere well to contacting surfaces and as resins, for example, for the production of prepregs.

Inventors

• 👤 Jurgen Fock
• 👤 Dietmar Schedlitzki
• 👤 Holger Wacker

Bibliographic Details