Patent ID: 6475505
Filing Date: 2002-11-05
Classification: A01N,C08J,C08K

Abstract:
A biocidaly active polymer composition resistant to discoloration which comprises a melt blend of:(I) a polymer substrate, and (II) an effective biocidal amount of a biocide-polyester concentrate, wherein the polymer substrate is polypropylene or polyethylene; which concentrate consists essentially of a biocide (A) and a polyester carrier resin (B), wherein the biocide (A) is 10-50% by weight of the concentrate and is selected from the group consisting of: (a) 2,4,4â€²-trichloro-2â€²-hydroxydiphenyl ether, (b) methylene-dithiocyanate, 2-N-octyl-4-isothiazolin-3-one or 3,5-dimethyl-tetrahydro-1,3,5-2H-thiodiazine-2-thione; (c) 2-methylithio-4-tert-butylamino-6-cyclopropylamino-s-triazine; (d) copper sulfate, copper nitrate or copper-bis(8-hydroxiquilonine); (e) tributyltin oxide; and (f) silver and zinc compounds or oxy-bis-phenoxyarsine; wherein the polyester carrier resin (B) is 90-50% by weight of the concentrate, and wherein the biocide (A) is 0.01 to 5% by weight based on the total composition.