Patent ID: 8080191
Filing Date: 2011-12-20
Classification: B29B,B29C,B29K,B29L,C08L,Y10T

Abstract:
1. An extrusion blowmolding process comprising: blending a polyester copolymer base component which develops crystallinity of less than 15% after 15 minutes under isothermal heating and a crystallizable polyester component to form a polyester blend containing the polyester copolymer base component and the crystallizable polyester component in a weight ratio of from about 30:70 to about 70:30; compounding the polyester blend; crystallizing and drying the polyester blend, wherein the blend is capable of developing greater than 10% crystallinity and the rate of crystallization is such that amorphous blend pellets can be crystallized to form a crystalline skin which is sufficient to prevent sticking during drying after one melt history; and forming an article comprising the polyester blend by extrusion blowmolding, wherein the process further comprises recovering tails and moyles of the extruded articles, and drying and reintroducing the tails and moyles as regrind at about 35 wt. % or more into the polyester blend.