Salts of dehydroacetic acid as a pyrithione stabilizer in plastics

摘要

The invention provides a method for preventing discoloration of pyrithione-containing materials, in particular plastic materials or other material such as paints, coatings, adhesives or textiles which are exposed to an outdoor environment. The method is likewise suited for preventing discoloration of other pyrithione-containing materials such as personal care compositions like shampoos. A discoloration inhibitor that includes dehydroacetic acid or a salt thereof is added to the pyrithione-containing material. The discoloration is prevented without the addition of a cyclic organic phosphoric acid ester or an organic phosphite. Use of the discoloration inhibitor does not interfere with the antimicrobial effect of the pyrithione.

主权项

1. A method for inhibiting discoloration of a material that comprises pyrithione or a salt thereof, the method comprising adding an effective amount of a discoloration inhibitor comprising dehydroacetic acid or a salt thereof to said material, wherein said material is a plastic material made from a vinyl polymers; wherein said vinyl polymer is selected from the group consisting of polyethylene, polypropylene, polyvinyl acetate, and polyvinyl chloride; and wherein said material is exposed to outside weathering conditions.