Patent ID: 6355697
Filing Date: 2002-03-12
Classification: C08F

Abstract:
A method for impregnating emulsion based seeds, comprising:a) providing polymeric, emulsion based seeds in an aqueous medium; b) combining with said polymeric, emulsion based seeds, in said aqueous medium, a suspending agent and one or more surfactants in a ratio of about 1:175 or less to the weight of suspending agent, to form a seed suspension; c) forming about 100 to about 2500 weight percent, based on the weight of the styrene polymer in the seed suspension, of a reaction mixture including styrene and one or more initiators; d) combining said reaction mixture with said seed suspension in the presence of one or more blowing agents to form a polymerization mixture; and e) heating said polymerization mixture to a polymerization temperature to effect formation of said styrenic polymer.