Hydrazido functionalized 2-(2-hydroxyphenyl)-2H-benzotriazoles
AssigneeElf Atochem North America, Inc.
InventorsRonald E. MacLeay, Terry N. Myers
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Abstract
Ultraviolet light stabilizers are chemically bound to anhydride containing polymers or copolymers. Polymeric stabilizers are prepared by the reaction of primary amino or hydrazido-substituted UV absorbers with some or all of the anhydride groups of the polymer or copolymer to form pendant stabilizer substituted imide or amic acid groups. The polymer bound stabilizers are not lost from the polymer system by volatilization, migration, or extraction, even at high temperature. The polymer stabilizers of this invention may be used as they are or as concentrates to stabilize other polymer systems.
Claims8
A hydrazido functionalized 2-(2-hydroxyphenyl)-2H-benzotriazole compound having a formula:
- ##STR11## wherein R.sup.6 is hydrogen, alkyl of 1 to 4 carbons, alkoxy of 1 to 4 carbons, carboxyl, alkoxycarbonyl of 2 to 11 carbons, carboxylic acid amide, chlorine, bromine, sulfonic acid, alkylsulfonyl or a primary hydrazido group H.sub.2 N--X.sup.2,
- R.sup.7 is hydrogen, alkyl of 1 to 8 carbons, aralkyl of 7 to 12 carbons, aryl of 6 to 14 carbons or a primary hydrazido group X.sup.3 --NH.sub.2,
- wherein only one of the substituents R.sup.6 or R.sup.7 must be a primary hydrazido group H.sub.2 N--X.sup.2 for R.sup.6 or X.sup.3 --NH.sub.2 for R.sup.7,
- X.sup.2 is --NH--C(.dbd.O)-- or --NH--S(.dbd.O).sub.2 --,
- X.sup.3 is
- --(CH.sub.2).sub.y --NH--C(.dbd.O)--(CH.sub.2).sub.b --C(.dbd.O)--NH--
- --(CH.sub.2).sub.y --NH--(CH.sub.2).sub.b --C(.dbd.O)--NH--
- --(CH.sub.2).sub.2 --C(.dbd.O)--NH--
- --(CH.sub.2).sub.y --NH--C(.dbd.O)--CH.sub.2 --S--(CH.sub.2).sub.z --C(.dbd.O)--NH--
- --O--(CH.sub.2).sub.b --C(.dbd.O)--NH-- or --C(.dbd.O)--NH--
- in which b is 0, 1 or 2, y is 1, 2 or 3, and z is 1 or 2 and
- rings A and B may be additionally substituted by alkyl of 1 to 4 carbons, alkoxy of 1 to 4 carbons, chlorine or bromine.
Dependencies are inferred from the claim text.