Patent ID: 8034269
Filing Date: 2011-10-11
Classification: B29B,B29C,C08J

Abstract:
1. A compounding process comprising (i) melt blending in an extruder at least two polymeric resins comprising acrylonitrile-butadiene-styrene graft copolymer and polycarbonate to produce a mixture that includes at least one resin that dissociates to yield monomers and/or oligomers upon heating, said mixture containing initially less than 1 percent of volatile components, (ii) introducing into said mixture an inert entraining agent (iii) removing said entraining agent together with said volatile components from said mixture, wherein the degassing efficiency of the process, calculated according to the formula  is at least 68%, the entraining agent is introduced at an amount of 0.1 to 0.5% based on the total weight of said polymeric resins, and wherein the extruder includes at least one melting zone, at least two degassing zones and at least one mixing zone.