Thermal stabilization of biocides in matrix compositions processed at elevated temperatures
A composition includes (a) a matrix, (b) a biocide, and (c) an antioxidant, in which said biocide exhibits thermal stability at matrix processing temperatures up to 250° C.
1 . A composition comprising:
(a) a matrix,
(b) a biocide, and
(c) an antioxidant,
in which said biocide exhibits thermal stability at matrix processing temperatures up to 250° C.
2 . A composition according to claim 1 wherein (a) is a plastic.
3 . A composition according to claim 1 wherein (a) is a polyolefin.
4 . A composition according to claim 1 wherein (a) is polyvinyl chloride or polyurethane.
5 . A composition according to claim 1 wherein (a) is a wood-plastic composite.
6 . A composition according to claim 1 wherein (b) is selected from N-(trichloromethylthio) phthalimide, N-trichloromethylthio-tetrahydrophthalimide and N-haloalkylthio compounds including dichlorofluamide, captofol, fluorfolpet, tolylfluamide and sulphenylated urea derivatives.
7 . A composition according to claim 1 wherein (b) is 3-iodopropynyl butylcarbamate, 3-iodopropynylcarbamate, or 3-iodopropynyl-N-phenylcarbamate, and the like.
8 . A composition according to claim 1 wherein (c) is a hindered phenol, an amine or azole.
9 . A composition according to claim 1 wherein (c) is a mixture of a hindered phenol an aryl phosphate.
10 . A composition according to claim 1 wherein (b) is present in an amount, by weight, of about 0.1-1%.
11 . A composition according to claim 1 wherein (c) is present in an amount of 0.2-2%.