US 5,459,222 AGranted

UV-absorbing polyurethanes and polyesters

AssigneeCiba-Geigy Corporation

InventorsJuliana Rodgers, Istvan Borsody, Athanasios Karydas, Robert A. Falk, Karl F. Mueller, Michele Kovaleski

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Abstract

Polyurethanes and polyesters are described which are the reaction products of an aromatic, aliphatic or cycloaliphatic diisocyanate, or of a diacid or diacid derivative respectively, with a diol containing a pendent UV-absorbing moiety, optionally also with one or more other diols or diamines. These UV-absorbing polycondensates can be applied to the surfaces of substrates by exhaustion methods or by spraying and act to protect polymers and dyes from degradation by UV radiation. They are therefore useful, either alone or in combination with other coating materials, for the treatment of wood, paper, textiles, leather or other surfaces which are exposed to degrading radiation.

Claims13

Dependent claims

A polyurethane of 1,000 to 15,000 molecular weight of the formula I ##STR7## wherein n is a number from 2 to 20,

m is zero to 5,
R.sub.1 is the diradical residue of an aliphatic, cycloaliphatic or aromatic diisocyanate with structure OCN-R.sub.1 -NCO,
R.sub.2 and R.sub.3 independently of each other are C.sub.2 -C.sub.6 alkylene,
R.sub.4 is the diradical residue of a diol or diamine of 40 to 5000 molecular weight,
X is oxygen or -NH- and
Q is a radical of the formula ##STR8## in which R.sub.5 is hydrogen, chlorine or C.sub.1 -C.sub.4 alkyl,
R.sub.6 is C.sub.1 -C.sub.8 alkyl,
R.sub.7 is hydrogen or hydroxyl and
R.sub.8 is hydrogen or C.sub.1 -C.sub.8 alkyl,
with the proviso that the sum of m+n is such that the resulting polymer has an average molecular weight of 1,000 to 15,000.

7 more elements

Dependencies are inferred from the claim text.