Patent ID: 7750100

Claim:
A process for preparing a (meth)acrylate of a N-hydroxyalkylated lactam, in which a cyclic N-hydroxyalkylated lactam (C) wherein: R 1 is a C 1 -C 5 -alkylene group, or a C 2 -C 20 -alkylene group interrupted by at least one of an oxygen atom, a sulfur atom, a substituted imino group, an unsubstituted imino group, a cycloalkyl group, —(CO)—, —O(CO)O—, —(NH)(CO)O—, —O(CO)(NH)—, —O(CO)— and —(CO)O—, which may be further substituted by at least one of an aryl group, an alkyl group, an aryloxy group, an alkyloxy group, a heteroatom and a heterocycle, with the proviso that R 1 must not have any atom other than a carbon atom directly adjacent to the lactam carbonyl group, R 2 is a C 1 -C 20 -alkylene group, a C 5 -C 12 -cycloalkylene a C 6 -C 12 -arylene group, or a C 2 -C 20 -alkylene group interrupted by at least one of an oxygen atom, a sulfur atom, a substituted imino group, an unsubstituted imino group, a cycloalkyl group, —(CO)—, —O(CO)O—, —(NH)(CO)O—, —O(CO)(NH)—, —O(CO)— and —(CO)O—, which may be further substituted by at least one of an aryl group, an alkyl group, an aryloxy group, an alkyloxy group, a heteroatom and a heterocycle, or R 2 —OH is a group of the formula —[X i ] k —H, k is from 1 to 50 and X i , is independently selected from the group consisting of —CH 2 —CH 2 —O—, —CH 2 —CH 2 —N(H)—, —CH 2 —CH 2 —CH 2 —N(H)—, —CH 2 —CH(NH 2 )—, —CH 2 —CH(NHCHO)—, —CH 2 —CH(CH 3 )—O—, —CH(CH 3 )—CH 2 —O—, —CH 2 —C(CH 3 ) 2 —O—, —C(CH 3 ) 2 —CH 2 —O—, —CH 2 —CH 2 —CH 2 —O—, —CH 2 —CH 2 —CH 2 —CH 2 —O—, —CH 2 —CHVin-O—, —CHVin-CH 2 —O—, —CH 2 —CHPh-O— and —CHPh-CH 2 —O—, and mixtures thereof where Ph is phenyl and Vin is vinyl, is esterified with (meth)acrylic acid or transesterified with at least one (meth)acrylic ester (D) in the presence of at least one heterogeneous inorganic salt (S).