Polyolefin antimicrobial compositions and melt-processing methods
AssigneeEastman Kodak Company
InventorsThomas N. Blanton, David W. Sandford, Kevin L. Bishop
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Abstract
A melt-processed polyolefin composition or composite includes a polyolefin compounded with a hindered amine light stabilizer, an organodisulfide antioxidant, and silver sulfate as an antimicrobial agent. A process of preparing such a composite includes compounding all of the compounds in various orders as long as the silver sulfate is added after the hindered amine light stabilizer is added to the polymer.
Claims22
A melt-processed composition comprising a polyolefin having dispersed therein at least 0.01 weight % of silver sulfate, at least 0.5 weight % of a hindered amine light stabilizer, and at least 0.001 weight % of an organo-disulfide.
A melt-processed film, fiber, or article comprising a polyolefin having dispersed therein at least 0.01 weight % of silver sulfate, at least 0.1 weight % of a hindered amine light stabilizer, and at least 0.001 weight % of an organo-disulfide.
A melt-processing method of preparing a polyolefin composition with antimicrobial properties, comprising:
- A) blending a polyolefin, hindered amine light stabilizer, and organo-disulfide, in any order, to provide a polyolefin composite, and
- B) subsequently, adding silver sulfate to said polyolefin composite.
A process of forming a polymer composite comprising a polyolefin, a hindered amine light stabilizer, an organo-disulfide additive, and silver sulfate, wherein the composite has a b*IF value greater than zero, wherein the process comprises:
- heating said polyolefin at least to melting point;
- obtaining said hindered amine light stabilizer,
- obtaining said silver sulfate antimicrobial agent;
- obtaining said organo-disulfide additive;
- and
- carrying out one of the following options a) through c) to form said polymer composite:
- a) compounding the heated polyolefin with said hindered amine light stabilizer and said organo-disulfide additive, then adding said silver sulfate antimicrobial agent,
- b) mixing said silver sulfate antimicrobial with said organo-disulfide additive, then compounding the resulting mixture with the heated polyolefin and said hindered amine light stabilizer, and
- c) compounding the heated polyolefin and hindered amine light stabilizer with said silver sulfate antimicrobial agent, then adding said organo-disulfide additive.
Dependencies are inferred from the claim text.