Cleaning agents for contact lenses
AssigneeBarnes-Hind Pharmaceuticals, Inc.
InventorsMurray J. Sibley, Gordon H. K. Yung, Petronio D. Urrea
Life of this patent
Estimating the term…
Abstract
Compositions are provided for the effective cleaning of soft and silicone contact lenses by soaking the lenses for a time sufficient to remove adherent residues in a solution containing an epoxy modified silicone surfactant and a fatty acid amide (or nitrogen analog thereof) surfactant, which may be cationic or non-ionic. Other additives may also be included such as thickening agents, bactericides, salts, anionic surfactants, and the like. The compositions are found to be particularly effective in removing strongly adhering proteinaceous matter, as well as lipids and polysaccharides.
Claims9
An aqueous composition for the cleaning of soft and silicone contact lenses which comprises:
- a. a water soluble polyalkyleneoxy modified dimethysilicone resin in an amount of about 0.5 to 2 weight percent
- b. at least one fatty acid amide or nitrogen analog thereof of the formula ##STR5## wherein:
- R is an aliphatic group of from 9 to 13 carbon atoms having a total unsaturation of from 0 to 1 site of olefinic unsaturation;
- X is oxygen or nitrogen;
- m is 0 when X is oxygen and 1 when X is nitrogen, wherein the nitrogen to which Y and Z are bonded is positive;
- when m is O, Y and Z are hydroxyethyl;
- and
- when m is 1, Y is caboxymethyl and Z is 2'-(carboxymethoxy)ethyl-1;
- with the proviso that the carboxy group may be present as the acid or its physiologically acceptable salt;
- and wherein the total amount of fatty acid amide and nitrogen analog thereof present is in the range of about 0.25 to 2.5 weight percent, and wherein the remainder of the composition is water.
An aqueous composition at a pH of about 7 to 9 for the cleaning of soft and silicone contact lenses which comprises:
- a. a water soluble polyalkyleneoxy modified dimethysilicone resin in an amount of from about 0.5 to 2 weight percent having the formula:
- TSi(O(SiMe.sub.2 O).sub.x.spsb.1 (C.sub.2 H.sub.4 O).sub.a (C.sub.3 H.sub.6 O).sub.b T.sup.1).sub.3
- wherein:
- each of the chains may be the same or different, the values given for x.sup.1, and a and b being the average over the entire composition;
- x.sup.1 is a number in the range of 4 to 8;
- a is a number in the range of 15 to 30,
- b is a number in the range of 10 to 20;
- wherein the ratio of a:x.sup.1 + b is at least 0.5:1
- T is alkyl of from 1 to 3 carbon atoms;
- and
- T.sup.1 is alkyl of from 1 to 6 carbon atoms
- b. a mixture of fatty acid amides and the nitrogen analogs thereof in from 0.25 to 2.5 weight percent and of the formula:
- ##STR6##
- wherein:
- R.sup.1 is an aliphatic group of from 9 to 13 carbon atoms and 0 to 1 site of ethylenic usaturation;
- Y.sup.1 and Z.sup.1 are hydroxyethyl and, ##STR7##
- wherein:
- R" is an aliphatic group of from 9 to 13 carbon atoms and 0 to 1 site of ethylenic unsaturation;
- Y" is carboxymethyl and Z" is 2'-(carboxymethoxy)ethyl-1 and may be present as their physiologically acceptable salts, and the remainder of said composition is water.
Dependencies are inferred from the claim text.