Abstract: Disclosed is cyclic urea derivatives represented by the following formula (A): ##STR1## wherein n is an integer of 0 or 1; m is an integer of 1 to 15; X is oxygen, sulfur or --NR.sub.1 -- (R.sub.1 is hydrogen or an alkyl group having 1 to 5 carbon atoms); R is an alkyl-, cycloalkyl -, aryl-, aralkyl-, alkaryl- and glycidyl group having 1 to 27 carbon atoms, or an alkyl-, cycloalkyl-, aryl-, aralkyl- and alkaryl group containing at least one ##STR2## O, S and N and having 1 to 27 carbon atoms with a molecular weight of 15 to 500, said groups substituted by glycidyl-, hydroxylic-, nitro groups, halogens, cyano-, formyl- or amino groups, or polyester-, polyether-, polyurethane and polyamide groups having a molecular weight of 500 to 100,000.

Abstract: A homopolymer or a copolymer comprises a polymerizable compound represented by formula (I):A--X--COCOOR.sub.1 (I)whereinR.sub.1 represents a hydrogen atom, a C.sub.1 -C.sub.5 alkyl group or an aryl group;X represents an oxygen atom, a sulfur atom, --COO-- or --NR.sub.5 --whereinR.sub.5 is a hydrogen atom or a C.sub.1 -C.sub.5 alkyl group;A represents a C.sub.3 -C.sub.18 alkenyl, alkynyl, alkenylaryl or alkenylaralkyl group, or a group represented by: ##STR1## wherein R.sub.2 and R.sub.3, which may be the same or different, independently represent a hydrogen atom or a C.sub.1 -C.sub.5 alkyl group;Y represents an oxygen atom or --NR.sub.4 -- wherein R.sub.4 represents a hydrogen atom or a C.sub.1 -C.sub.5 alkyl group; n is an integer of 1 to 5; m is an integer of 1 to 10; and l is 0 or an integer of 1 to 20;with the proviso that if Y is present, X is not --NR.sub.5 --. Additionally, disclosed are processes of preparing the homopolymer or copolymer as well as the polymerizable compound.

Abstract: The present invention relates to polymerizable cyclic urea derivatives which can be thermally split to give rise to an isocyanate group; and to a polymer having cyclic urea pendant groups, which can be cured by heating without any additional curing agent such as an isocyanate blocked with a volatile lower molecular weight material, so that volatile material is not released in a thermal curing process.