Patent ID: 6284808
Filing Date: 2001-09-04
Classification: B29C,C08G,C08J,Y02W

Abstract:
A heterogeneous mixture of polyethylene terephthalate (PET) material mixture which is suitable for subsequent processing, comprising:a single batch mixture of heterogeneous PET material which has a relatively wide distribution of intrinsic viscosity (IV) values, which are primarily within the range of 0.60 to 0.80 dl/g, but as high as 0.90 dl/g, and wherein said single batch mixture has been derived from an initial mixture comprising substantially crystalline flake segments and substantially non-crystalline chunk segments from which said substantially non-crystalline chunk segments have been removed such that said mixture comprises substantially only said substantially crystalline flake segments,whereby when said heterogeneous mixture of said PET materials comprising substantially only said substantially crystalline flake segments is processed further so as to increase said intrinsic viscosity (IV) values of said PET materials, the generation of a substantial amount of heat of crystallization within said processed mixture of said PET materials will be effectively prevented.