Polymer bound light stabilizer coating resins

Details Polymer bound light stabilizer coating resins Polymer bound light stabilizer coating resins

1990-02-28

1990-12-04

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253282, 5253288, 525375, 525376, C08F 830

Patent

active

049754947

ABSTRACT:
Acrylic coating resins with attached light stabilizer functional groups are provided.
The polymer bound light stabilizer coating resins are prepared by reacting light stabilizer hydrazides, LS--C(.dbd.O)--NR.sup.3 --NH.sub.2, with an acrylic prepolymer containing at least two different types of reactive functional groups, one of which is a hydroxyalkyl ester group and the other is carboxyl, anhydride, epoxy or isocyanate. LS is a light stabilizer moiety, and R.sup.3 is hydrogen, primary alkyl of 1 to 8 carbons, secondary alkyl of 3 to 8 carbons, aralkyl of 7 to 12 carbons or cycloalkyl of 5 to 12 carbons. The reaction may be carried out in an inert solvent or in the bulk state.
The acrylic resins so produced with chemically bound light stabilizer groups are particularly useful in the stabilization of coatings. Enamel or lacquer coatings containing the polymer bound light stabilizer resins exhibit outstanding weatherability and durability. As a result of being chemically bound, the light stabilizers are resistant to loss due to volatility and extractability during typical coatings bake operations and exposure to the elements of weather.

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M. Dexter et al., "Light and Heat Stabilizers for Coatings," Handbook of Coating Additives, pp. 225-269 (1987).

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