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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 ord

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.

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1. 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. 2. The melt-processed composition of claim 1 having a b*IF value

1. 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. 2. The melt-processed composition of claim 1 having a b*IF value greater than zero. 3. The melt-processed composition of claim 1 having a b*IF value greater than or equal to 0.35. 4. The melt-processed composition of claim 1 wherein said organo-disulfide is present in an amount of from about 0.002 to about 2 weight %. 5. The melt-processed composition of claim 1 wherein said silver sulfate is present in an amount of from about 0.025 to about 5 weight %. 6. The melt-processed composition of claim 1 wherein said hindered amine light stabilizer is present in an amount of from about 1 to about 50 weight %. 7. The melt-processed composition of claim 1 wherein said hindered amine light stabilizer is a polymeric sterically hindered amine light stabilizer. 8. The melt-processed composition of claim 7 wherein said polymeric hindered amine light stabilizer is selected from the group consisting of: a) 1,3-propanediamine,N,N″-1,2-ethanediylbis-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine,b) poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]], andc) 1,6-hexanediamine, N1,N6-bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5 triazine, reaction products with, N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine; andsaid organo-disulfide is octadecyl disulfide or diphenyl disulfide. 9. The melt-processed composition of claim 1 wherein said polyolefin is polypropylene, said silver sulfate is present in an amount of from about 0.025 to about 5 weight %, said hindered amine light stabilizer is present in an amount of from about 1 to about 50 weight %, and said organo-disulfide is present in an amount of from about 0.002 to about 2 weight %. 10. The melt-processed composition of claim 1 that is a masterbatch composition comprising at least 0.1 weight % silver sulfate, at least 5 weight % of a hindered amine light stabilizer, and at least 0.01% of an organo-disulfide, and that has a b*IF value greater than zero. 11. The melt-processed composition of claim 10 wherein said hindered amine light stabilizer is a polymeric sterically hindered amine light stabilizer. 12. The melt-processed composition of claim 10 wherein said polymeric hindered amine light stabilizer is selected from the group consisting of: a) 1,3-propanediamine,N,N″-1,2-ethanediylbis-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine,b) poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]], andc) 1,6-hexanediamine,N1,N6-bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5 triazine, reaction products with, N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, andsaid organo-disulfide is octadecyl disulfide or diphenyl disulfide. 13. 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. 14. The melt-processed film, fiber, or article of claim 13 wherein said organo-disulfide is present in an amount of from about 0.002 to about 0.5 weight %. 15. The melt-processed film, fiber, or article of claim 13 wherein said silver sulfate is present in an amount of from about 0.025 to about 0.5 weight %. 16. The melt-processed film, fiber, or article of claim 13 wherein said hindered amine light stabilizer is present in an amount of from about 0.5 to about 5 weight %, and that is a polymeric sterically hindered amine light stabilizer. 17. The melt-processed film, fiber, or article of claim 13 wherein said polymeric hindered amine light stabilizer is selected from the group consisting of: a) 1,3-propanediamine,N,N″-1,2-ethanediylbis-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine,b) poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]], andc) 1,6-hexanediamine,N1,N6-bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5 triazine, reaction products with, N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, andsaid organo-disulfide is octadecyl disulfide or diphenyl disulfide. 18. The melt-processed film, fiber, or article of claim 13 having a b*IF value greater than 0.35 and wherein said polyolefin is polypropylene, said silver sulfate is present in an amount of from about 0.025 to about 0.5 weight %, said hindered amine light stabilizer is present in an amount of from about 0.5 to about 5 weight %, and said organo-disulfide is present in an amount of from about 0.002 to about 0.5 weight %. 19. 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, andB) subsequently, adding silver sulfate to said polyolefin composite. 20. The melt-processing method of claim 19 wherein the following are compounded, in order: said polyolefin with said hindered amine light stabilizer, then said organo-disulfide, and then silver sulfate. 21. The melt-processing method of claim 19 wherein the prepared polyolefin composition has a b*IF value greater than zero and comprises the following component concentrations: said silver sulfate is present in an amount of from about 0.025 to about 5 weight %, said hindered amine light stabilizer is present in an amount of from about 1 to about 50 weight %, and said organo-disulfide is present in an amount of from about 0.002 to about 2 weight %. 22. 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; andcarrying 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, andc) compounding the heated polyolefin and hindered amine light stabilizer with said silver sulfate antimicrobial agent, then adding said organo-disulfide additive.