Copolymer light stabilizers having at least one 2,2,6,6-tetraalkyl piperidyl group and synthetic resin compositions containing the same

Copolymer light stabilizers having at least one 2,2,6,6-tetraalkyl piperidyl group in the molecule and a molecular weight within the range from about 1000 to about 20,000 of a maleic or fumaric acid ester having the formula:

• ##STR139## wherein:
• ##STR140## R.sub.2 is alkyl having from one to about eighteen carbon atoms or R.sub.1 ;
• X is --CH<, ##STR141## R.sub.6 is lower alkyl or hydroxyalkyl having from one to about four carbon atoms;
• R.sub.3 is hydrogen, alkaryl having from seven to ten carbon atoms;
• or alkyl, hydroxyalkyl or epoxyalkyl having from one to about eighteen carbon atoms;
• R.sub.4 is hydrogen or methyl;
• R.sub.5 is alkylene having from two to about four carbon atoms;
• Y is ##STR142## and R.sub.7 is alkylene having from two to about eighteen carbon atoms;
• with at least one monomer selected from the group consisting of aliphatic carboxylic acid vinyl esters having from two to about eight carbon atoms;
• alkyl vinyl ethers having from one to about eighteen carbon atoms;
• triallyl isocyanurate;
• pinene;
• and tricyclo(5.2.1.0.sup.2.6)-decene-3.