Mixtures of phenolic and inorganic materials with antimicrobial activity
AssigneeCiba Specialty Chemicals Corporation
InventorsHeinz Herbst, Urs Stadler
Life of this patent
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Abstract
Plastic films, fibers and articles are provided long-term antimicrobial activity with a combination of certain phenolic and inorganic antimicrobial agents. The plastic films, fibers and articles with antimicrobial activity exhibit superior resistance to discoloration, may be processed at high temperature, and maintain physical properties upon weathering, especially upon exposure to ultraviolet radiation.
Claims8
An antimicrobial plastic film, fiber or article which has incorporated therein a mixture of antimicrobial agents, which mixture 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)
- wherein
- n is 0 or 1,
- R1 and R2 are hydrogen or chlorine,
- R3 is hydrogen or hydroxyl,
- R4, R5 and R6 are hydrogen or chlorine,
- R7 is 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.
A masterbatch or concentrate of a mixture of antimicrobial agents in a carrier,
- wherein the mixture is present at a total concentration of about 2.5% to about 70% by weight based on the weight of the carrier,
- 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 and
- wherein the mixture of antimicrobial agents 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)
- wherein
- n is 0 or 1,
- R1 and R2 are hydrogen or chlorine,
- R3 is hydrogen or hydroxyl,
- R4, R5 and R6 are hydrogen or chlorine,
- R7 is 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.
Dependencies are inferred from the claim text.