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US 6,475,505 B1Granted
Biocide-polyester concentrates and biocidal compositions prepared therefrom
AssigneeCiba Specialty Chemicals Corporation
InventorUrs Stadler
Life of this patent
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Abstract
Concentrates of various classical biocides in a polyester carrier resin when incorporated into a substrate resin, preferably a polyolefin such as polypropylene or polyethylene, provide the substrate polymer which biocidal activity with superior resistance to discoloration (yellowing) than when the biocide is directly incorporated into the substrate polymer as a powder at the same total concentration.
Claims13
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) 2,4,4′-trichloro-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.
11 more elements
Dependencies are inferred from the claim text.