Acylated hindered hexahydropyrimidines and their use as light stabilizing agents

Claim 1

An acylated, hindered hexahydropyrimidine of the formula ##STR25## wherein R 1 , R 2 , R 3 and R 4 may be the same or different independently of each other and are selected from the group consisting of: alkyl having 1 to 6 carbon atoms, when unsubstituted, or substituted with one methyl, ethyl, or phenyl group, aryl, and aryl substituted with 1 to 3 substituents selected from the group consisting of lower alkyl, lower alkoxy, and hydroxyl, and wherein R 1 together with R 2 , and R 3 together with R 4 , each taken together with the respective ring carbon to which they are attached, may form respectively a cycloalkyl of ring size from 4 to 7 carbons; R 5 and R 6 may be the same or different and are selected from the group consisting of hydrogen, and alkyl having 1 to 6 carbon atoms, and arylalkyl, and R 5 together with R 6 and the two ring carbons to which they are attached respectively may form a cycloalkyl group of ring size from 5 to 7 carbon atoms; R 7 is selected from the group consisting of: alkyl having 1 to 20 carbon atoms, substituted alkyl where the alkyl without substitution has 1 to 20 carbon atoms and where substituents may be up to five lower alkyl groups, arylalkyl, cycloalkyl having 3 to 12 carbon atoms, aryl, aryl substituted with 1 to 3 substituents selected from the group consisting of: lower alkyl, lower alkoxy, and hydroxyl; ##STR26## wherein R 9 is selected from the group consisting of alkyl having 1 to 20 carbon atoms unsubstituted, or substituted with up to 5 lower alkyl groups, and cycloalkyl having 5 to 11 carbons and phenyl; wherein A is: alkylene of 1 to 12 carbons; alkylene substituted with alkyl or alkenyl to have a total of up to 18 carbons; alkenylene of 2 to 4 carbons; cycloalkylene of up to 12 carbon atoms; cycloalkenylene of up to 12 carbon atoms; bicycloalkylene up to 8 carbon atoms; bicycloalkenylene up to 8 carbon atoms; or phenylene, and wherein R 10 is selected from the group consisting of hydroxyl, lower alkoxy, phenoxy and the group ##STR27## wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are as defined above, and R 8 is selected from the group consisting of hydrogen, alkyl having 1 to 10 carbon atoms, substituted alkyl having 1 to 10 carbon atoms, arylalkyl, hydroxyl, oxyl and ##STR28## wherein R 11 is selected from the group consisting of alkyl having 1 to 20 carbon atoms unsubstituted, or substituted with up to five lower alkyl groups wherein the substitution in substituted alkyl consists of from 1 to 3 substituent alkyl groups of up to 18 carbons each, which substituent groups may be the same or different, and wherein the substitution in substituted aryl consists of from 1 to 3 substituent groups that may be the same or different and that are selected from the group consisting of hydroxyl and lower alkyl.