Patent ID: 8247522
Filing Date: 2012-08-21
Classification: B29B,C08G,C08J,F26B,Y10T

Abstract:
1. A bulk of polyethylene terephthalate particles, wherein said particles have the following characteristics: (a) comprise a shell and a core, wherein said shell substantially surrounds said core, wherein at least a portion of said shell exhibits strain-induced crystallinity and at least a portion of said core exhibits spherulitic crystallinity; (b) when measured on a first heating DSC scan, said particles have a low melting peak temperature greater than 190° C., and a melting endotherm area greater than the absolute value of 1 J/g; (c) an intrinsic viscosity of from 0.78 to 1.1 dL/g; and (d) a total content of titanium, germanium, tin, and aluminum of less than 50 ppm.