Polyester granule for melt-shaping and process for the...

Details Polyester granule for melt-shaping and process for the... Polyester granule for melt-shaping and process for the...

C - Chemistry, Metallurgy

08

J

402/202

C08J 3/12 (2006.01)

Patent

CA 1052498

ABSTRACT OF THE DISCLOSURE Polyester granule for melt-shaping which is composed of a difficultly crystallizable copolyester having the minimum time for half-crystallization of at least one minute, and has the surfaces resulting from cutting by a cutter, improvement in that (i) the polyester granule has an intrinsic viscosity of at least 0.55 (as measured in o-chlorophenol at 35°C.), (ii) the polyester granule has in its surface portion an oriented portion having an N-value of at least 0.04, the N-value being calculated by the equation, N = n??d and (iii) the inside of the polyester granule other than the said surface portion has an N-value of not higher than 0.02. Said polyester granule can be prepared by cutting a copolyester melt-extrudate having an intrinsic viscosity of at least 0.55 under the conditions as will control the surface temperature t (°C) of the extrudate to satisfy the expression Tg + 30°C. ? t > Tg - 15°C. - 1 -

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