Patent ID: 6458314
Filing Date: 2002-10-01
Classification: B29B,B29C,B29K,C08G,Y10S

Abstract:
A process for heat-setting against dimensional heat deformation injection blow-molded containers from polyester resins, wherein injected preforms are obtained from polyethyleneterephthalate or copolyethyleneterephthalates containing up to 20% by mols of units deriving from an acid selected from the group consisting of isophthalic acid, a naphtalene dicarboxylic acid and a combination of both, upgraded in the solid state in the presence of from 0.01 to less than 0.1 wt % of a dianhydride of an aromatic tetracarboxylic acid and the obtained preforms are heat treated for less than 10 seconds at temperatures from 80Â° to less than 130Â° C. in a mold used for blowing the preforms.