Patent ID: 6033731
Filing Date: 2000-03-07
Classification: A01N

Abstract:
A process for incorporating from 100 to 10,000 ppm based on the weight of thermoplastic of an insecticide selected from the group consisting of 1-[(6-chloro-3-pyridinyl)methyl]-4,5-dihydro-N-nitro-1H-imidazol-2-amine; 3-(2,2-dichloroethenyl)-2,2-di-methylcyclopropanecarboxylic acid cyano-(3-phenoxyphenyl)-methyl ester; and 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid (3-phenoxyphenyl)-methyl ester into an expandable bead of a thermoplastic polymer prepared by suspension or emulsion polymerization of a monomer mixture consisting of 100 to 60 weight % of one or more monomers selected from the group consisting of styrene, alphamethyl styrene and p-methyl styrene and from 0 to 40 weight % of a monomer selected from the group consisting of acrylic acid, methacrylic acid, maleic anhydride, methyl methacrylate, methyl acrylate and ethyl acrylate, comprising concurrently impregnating said bead with said insecticide and from 1 to 10 weight % based on the weight of said thermoplastic of one or more blowing agents selected from the group consisting of butane, pentane and hexane.