Abstract: Imides of the formula I ##STR1## In which R.sub.1, R.sub.2 and R.sub.4 independently of one another are hydrogen or methyl, R.sub.3 is a direct bond or a C.sub.2 -C.sub.20 aliphatic radical which can be interrupted by O atoms or a mononuclear or polynuclear C.sub.5 -C.sub.20 cycloaliphatic or C.sub.6 -C.sub.20 aromatic radical or is a group of the formula II ##STR2## in which T is methylene, isopropylidene, CO, O, S or SO.sub.2 and R.sub.5 is hydrogen or phenyl, can be crosslinked either photochemically or by heat and produce polymers having excellent properties, in particular a very high resistance to heat. They are particularly suitable for the production of heat-resistant photolithographs or as matrix resins for the production of composite materials.

Abstract: Compounds of formula ##STR1## wherein E and R' are each independently of the other a hydrogen atom or a methyl group,X is ##STR2## and R is --C.sub.m H.sub.2m --, in which m is 2 to 20, --C.sub.n H.sub.2n O--, in which n is 2 to 6, m- or p-phenylene, m- or p-oxyphenylene, in which the oxygen atom is attached to the group X, or X is ##STR3## and R is m- or p-phenylene, or X is ##STR4## and R is --(CH.sub.2 CH.sub.2 O).sub.q --, --(CH.sub.2 CH.sub.2 CH.sub.2 O).sub.q -- or --[CH.sub.2 CH(CH.sub.3)O].sub.q --, in which q is 1 to 6, m- or p-oxyphenylene, in which the oxygen atom is attached to the group X, or X is ##STR5## and R is --C.sub.r H.sub.2r --, in which r is 2 to 4, or m- or p-phenylene,are suitable for the preparation of crosslinked polymers.

Abstract: Imides of formula I ##STR1## wherein R.sup.1 and R.sup.2 are independently hydrogen or methyl, R.sup.3 is a direct bond, alkylene, oxaalkylene, cycloalkylene, arylene or arylene-T-arylene where T is methylene or isopropylidene, and R.sup.4 alkyl, cycloalkyl, aryl, benzyl or alkaryl are suitable as catalysts for the crosslinking of specific unsaturated imides.

Abstract: The process for preparing a lacquer utilizing an aqueous dispersion, the lacquer being pigmented or non-pigmented, being self-cross linking upon heat treatment and containing a binder consisting essentially of the following monomers:A. 30 to 70 parts by weight of at least one monomer whose homopolymer has a theoretical glass temperature of less than 10.degree. C., based on the total weight of the binder,B. 30 to 70 parts by weight of at least one monomer whose homopolymer has a theoretical glass temperature of more than 30.degree. C., based upon the total weight of the binder,C. 0.5 and 5 parts by weight of at least one polymerizable acid and/or salt thereof, based upon the total weight of the binder,D. 2 to 35 parts by weight of at least one reactive monomer, based upon the total weight of the binder, andE. 0.5 to 35 parts by weight of at least one alkali or ammonium salt of a polymerizable sulfonic acid compound, based upon the total weight of the binder.