Patent ID: 7045581
Filing Date: 2006-05-16
Classification: C08F

Abstract:
1. A method for the homogeneous prepolymerization of a feed comprising at least one of a monomer and a prepolymer in a reactor comprising the steps of: providing a two stage reactor; feeding a feed comprising at least one of a monomer and a prepolymer to a first stage of the reactor; admixing an initiator without solvent with the feeding in the first stage of the reactor to obtain a product of desired viscosity; contacting the surface of the product coming from the first stage with a solvent wherein the solvent evaporates on the surface of the product and cools same while maintaining the desired viscosity of the product; polymerizing in a second stage the cooled product at a temperature T, wherein T is (1) below the glass transition temperature in the case of amorphous polymers and (2) below the melting point in the case of crystalline polymers wherein, the polymerization proceeds to a granular state in the reactor; and recycling the evaporated solvent.