High loading water-dispersible UVA and/or UVB light-absorbing copolymer
AssigneeLever Brothers Company, Division of Conopco, Inc.
InventorsMatthew E. Langer, Ferial Khorshahi
Life of this patent
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Abstract
The invention is concerned with novel water-dispersible copolymers which contain at least one UVA light-absorbing monomer, one UVB light-absorbing monomer, one hydrophilic monomer, and optionally one hydrophobic monomer component. The UVA light-absorbing monomer absorbs at .lambda.max ultraviolet light in the 320-400 nm range. The UVB light-absorbing monomer absorbs at max ultraviolet light in the 290-320 nm range. Because of the R.sub.3 group used in the invention, the copolymers of the invention permit higher loading of UV monomers than previously obtainable.
Claims11
A copolymer having the formula:
- ##STR5## wherein:
- R is a difunctional aryl or alkyl group or a difunctional straight or branched alkyl chain containing 4 to 16 carbon atoms;
- R.sub.1 is hydrogen or an aliphatic group having 1 to 20 carbons, an aryl, an alkaryl, a secondary amine, an alkali metal sulfonate, an alkali metal carboxylate, an alkyl ether, or a halogen atom;
- R.sub.2 is a difunctional moiety absorbing UVA light at .lambda.max;
- R.sub.3 is a charged moiety selected from the group consisting of a carboxylate salt, a sulfonate salt, and a quaternary ammonium derivative;
- R.sub.4 is a difunctional moiety absorbing UVB light at .lambda.max;
- x is selected such that the hydrophobe is present at 0 to 49.9 mol % of the polymer;
- y is selected such that the R.sub.2 group is present at 0 to 99.9 mol % of the polymer;
- z is selected such that the R.sub.3 group is present at 0.5 to 49.9 mol % of the polymer;
- and
- w is selected such that the R.sub.4 group is present at 0 to 99.9 mol % of the polymer;
- wherein y must be greater than 0 if w is 0 and w must be greater than 0 if y is 0.
Dependencies are inferred from the claim text.