Patent ID: 6193990
Filing Date: 2001-02-27
Classification: A01N,C08K

Abstract:
A process for producing a safened controlled release composition, which comprises the steps of:(i) blending about 5 to 60% by weight of a polyvinyl chloride resin having a weight average molecular weight of about,41,000 to about 130,000, with about 0.2 to 1.5% by weight of a first stabilizing agent of a stearate or stearates, an alkaline earth metal stearates or stearates, or a mixture or mixtures thereof, and about 20 to 80% by weight of a mineral carrier selected from the group consisting of barium sulfate, calcium sulfate, and mixtures thereof, at a temperature of about 70 to 110.degree. C. to form a mixture;(ii) impregnating the mixture with about 0 to 50% by weight of a plasticizing agent selected from the group consisting of organic phthalates, and mixtures thereof, about 4 to 65% by weight of a terbufoa insecticide, and about 0.2 to 1.5% by weight of epoxidized soybean oil stabilizing agent, at a temperature of about 70 to 110.degree. C. to form a free flowing composition; and(iii) extruding the free-flowing composition at a temperature of about 130 to 180.degree. C. to form said safened controlled release composition in solid form.