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Abstract

Copolymerization is started by reacts in and acrylamide represented by the general formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group and R.sub.2 represents a hydrogen atom, an alkyl group, an aryl group or an aralkyl group, with an amount of methyl methacrylate in pure methanol or methanol containing Water in an amount of not more than 30% by weight based on the total weight of methanol and water, and, an additional amount of the methyl methacrylate is added at periods during proceeding of the polymerization. The obtained copolymer is heated at 80.degree. to 150.degree. C. in the same solvent and in the presence of an alkaline catalyst, to an imidized acrylic resin containing glutarimide groups. The imidized acrylic resins obtained by the process of the present invention have excellent thermal stability, transparency and color shade, and contain little acid or acid anhydride. Where the glutarimide group is N-hydrogenglutarimide, the imidized acrylic resin is readily isolated as a particulate solid of stabilized emulsion by addition of a hydroxide and/or alcolate of an alkali metal to a solution of the imidized acrylic resin in water-containing methanol, followed by cooling. This emulsion is neutralized with an acid, separated by filtration and washed, to give a highquality imidized acrylic resin.

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First Claim