Claims
- 1. A mixture of antimicrobial agents for plastics applications which comprises
a) at least one phenolic antimicrobial compound, and b) at least one inorganic antimicrobial compound, wherein the phenolic antimicrobial compound is of the formula (I) 4wherein n is 0 or 1, R1 and R2are hydrogen or chlorine, R3 is hydrogen or hydroxyl, R4, R5and R6are hydrogen or chlorine, R7is hydroxyl, and X is —O— or —CH2—, and wherein the inorganic antimicrobial compound is selected from the group consisting of zinc oxide, copper and copper compounds, silver, colloidal silver, silver nitrate, silver sulphate, silver chloride, silver complexes, metal-containing zeolites and surface-modified metal-containing zeolites, wherein the ratio of components a):b) is from about 1:9 to about 9:1.
- 2. A mixture of antimicrobial agents according to claim 1 wherein the phenolic antimicrobial compound is selected from the group consisting of o-benzyl-phenol, 2-benzyl-4-chloro-phenol, 2,4,4′-trichloro-2′-hydroxydiphenyl ether, 4,4′-dichloro-2-hydroxydiphenyl ether, 5-chloro-2-hydroxy-diphenyl-methane, mono-chloro-o-benzyl-phenol, 2,2′-methylenbis-(4-chloro-phenol) and 2,4,6-trichlorophenol.
- 3. A mixture of antimicrobial agents according to claim 2 wherein the phenolic antimicrobial compound is selected from the group consisting of 2,4,4′-trichloro-2′-hydroxydiphenyl ether and 4,4′-dichloro-2-hydroxydiphenyl ether.
- 4. A mixture of antimicrobial agents according to claim 1 wherein the inorganic antimicrobial agent is a metal-containing zeolite or a surface-modified metal-containing zeolite.
- 5. A mixture of antimicrobial agents according to claim 4 wherein the metal is selected from the group consisting of silver, copper, zinc, zirconium and combinations thereof.
- 6. A mixture of antimicrobial agents according to claim 5 wherein the metal is selected from the group consisting of silver and combinations of silver with copper, zinc or zirconium.
- 7. A mixture of antimicrobial agents according to claim 4 wherein the inorganic antimicrobial agent is a metal-containing surface-modified zeolite wherein the metal is selected from the group consisting of silver and combinations of silver with copper, zinc or zirconium.
- 8. A mixture of antimicrobial agents according to claim 7 wherein component a) is 2,4,4′-trichloro-2′-hydroxydiphenyl ether and wherein component b) is a surface-modified metal-containing zeolite.
- 9. An antimicrobial plastic film, fiber or article which has incorporated therein a mixture of antimicrobial agents according to claim 1.
- 10. An antimicrobial plastic film, fiber or article according to claim 9 in which the plastic is selected from the group consisting of polyethylene, polypropylene, acrylonitrile-butadiene-styrene terpolymer (ABS), styrene-acrylonitrile copolymer (SAN), polystyrene (PS), polymethyl methacrylate (PMMA), polyester, polyamide, polyvinyl chloride (PVC), polymer latex, polyurethane (PUR), thermoplastic urethane (TPU), urea formaldehyde resin (UF) and unsaturated polyester (UP).
- 11. An antimicrobial plastic film, fiber or article according to claim 10 in which the plastic is selected from low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polyester and polyamide.
- 12. An antimicrobial plastic film, fiber or article according to claim 9 in which the mixture of components a) and b) is present from about 0.005 to about 10% by weight based on the plastic film, fiber or article.
- 13. An antimicrobial plastic film, fiber or article according to claim 12 in which the mixture of components a) and b) is present from about 0.01 to about 5% by weight based on the plastic film, fiber or article.
- 14. An antimicrobial plastic film, fiber or article according to claim 13 in which the mixture of components a) and b) is present from about 0.05 to about 3% by weight based on the plastic film, fiber or article.
- 15. An antimicrobial plastic film, fiber or article according to claim 9 which additionally comprises at least one co-additive selected from the group consisting of antioxidants, ultraviolet light absorbers, hindered amines, phosphites or phosphonites, hydroxylamines, nitrones, benzofuran-2-ones, thiosynergists, polyamide stabilizers, metal stearates, nucleating agents, fillers, reinforcing agents, lubricants, emulsifiers, dyes, pigments, optical brighteners, flame retardants, antistatic agents and blowing agents.
- 16. A masterbatch or concentrate of a mixture of antimicrobial agents according to claim 1 wherein the components a) and b) are present at a total concentration of about 2.5% to about 70% by weight based on the weight of the carrier, and wherein the carrier is selected from the group consisting of polyethylene, polypropylene (PP), acrylonitrile-butadiene-styrene terpolymer (ABS), styrene-acrylonitrile copolymer (SAN), polystyrene (PS), acrylates, polymethyl methacrylate (PMMA), polyamide, polyesters, polyvinyl chloride (PVC), polymer latex, styrene, polyol, thermoplastic urethane (TPU), unsaturated esters, urea, paraformaldehyde and water emulsion.
Parent Case Info
[0001] This application claims the benefit under 35 USC 119(e) of U.S. Provisional Application Serial No. 60/234,433, filed Sep. 21, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60234433 |
Sep 2000 |
US |