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US 6,143,850 AGranted
Lipophilic polymeric UV absorbers
AssigneeBASF SE
InventorsHarald Keller, Volker Schehlmann, Horst Westenfelder, Thomas Preiss
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Abstract
Polymeric UV absorbers based on the units shown in the schematized formula I ##STR1## where the sequence of the units is arbitrary, the sum of a+b+c+d=100 and a is a value from 5 to 95, b is a value from 0 to 70, c is a value from 5 to 95, d is a value from 0 to 70 and the radicals R have the meaning explained in the description, are described.
Claims4
A polymeric UV absorber comprising the units shown in brackets in schematized formula I ##STR16## wherein the sequence of the units is arbitrary, the sum of a+b+c+d=100 and
- a is a percentage value from 5 to 95,
- b is a percentage value from 0 to 70,
- c is a percentage value from 5 to 95, and
- d is a percentage value from 0 to 70;
- R.sup.1, R.sup.2 independently of one another are H or C.sub.1 -C.sub.8 -alkyl;
- R.sup.3 is ##STR17## X.sup.1, X.sup.2 independently of one another are H,C.sub.1 -C.sub.8 -alkyl, or ##STR18## X.sup.3 is H, C.sub.1 -C.sub.8 -alkyl, or ##STR19## X.sup.4 is H, C.sub.1 -C.sub.8 -alkyl, ##STR20## X.sup.5, X.sup.6 independently of one another are H, C.sub.1 -C.sub.8 -alkyl, ##STR21## X.sup.7 is H or C.sub.1 - to C.sub.8 -alkyl;
- is --(CO).sub.n --R.sup.5 ;
- R.sup.5 is C.sub.1 -C.sub.28 -alkyl;
- n is 0 or 1;
- R.sup.6 is C.sub.1 -C.sub.22 -alkyl;
- and
- R.sup.7, R.sup.8 independently of one another are H or CH.sub.3.
9 more elements
Dependencies are inferred from the claim text.