Mixtures of phenolic and inorganic materials with antimicrobial activity
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.
1. A polyolefin plastic composition which comprises
polypropylene or polyethylene and
incorporated therein a mixture of
a) 2,4,4′-trichloro-2′-hydroxydiphenyl ether and
b) an antibacterial silver-supporting zeolite,
wherein the weight ratio of components a):b) is from 5:1 to 1:1 and
wherein the mixture of a) and b) is present from about 0.05 to about 3% by weight, based on the weight of the polypropylene or polyethylene.
2. A composition according to claim 1 wherein component b) is a surface-modified antibacterial silver-supporting zeolite.
3. A composition according to claim 1 wherein the weight ratio of components a):b) is 1:1.
4. A composition according to claim 1 where the weight ratio of components a):b) is 2:1.
5. A composition according to claim 1 where the weight ratio of components a):b) is 5:1.
6. A composition according to claim 2 wherein the weight ratio of components a):b) is 1:1.
7. A composition according to claim 2 where the weight ratio of components a):b) is 2:1.
8. A composition according to claim 2 where the weight ratio of components a):b) is 5:1.