Low melting polyester polymers

Patent metadata

Field	Value
Publication number	US-8968615-B2
Application number	US-90912610-A
Country	US
Kind code	B2
Filing date	Oct 21, 2010
Priority date	Sep 2, 2004
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A bulk of polyester polymer particles comprising polyester polymer comprising greater than 75% virgin polyester polymer, the particles having:
A) an It.V. of at least 0.72 dl/g, and B) 10 ppm or less of residual acetaldehyde; and C) at least two melting peaks, wherein one of said at least two melting peaks is a low peak melting point within a range of 140° C. to 220° C. and having a melting endotherm area of at least the absolute value of 1 J/g.

The particles may also have a degree of crystallinity within a range of 20% and a maximum degree of crystallinity T cmax defined by the equation:

T cmax =50%−CA−OH

where CA is the total mole % of all carboxylic acid residues other than terephthalic acid residues, based on 100 mole % of carboxylic acid residues, and OH is the total mole % of all hydroxyl functional compound residues other than ethylene glycol residues, based on 100 mole % of hydroxyl functional compounds residues. The preforms and bottles made from these particles can be obtained by melt processing these particles at either lower overall power, faster screw speeds, lower residence time, or lower overall cycle time to thereby reduce the level of residual acetaldehyde generated in the melt.

First claim

What we claim is:

1. A process for melt process for melt processing polyester polymer particles comprising:
A) if a drying zone is present, drying the particles in the drying zone to produce dried particles;
B) feeding the particles into a melt processing zone, or if a drying zone is present, feeding dried particles into a melt processing zone;
C) melting the particles in the melting processing zone, and
D) forming articles from the melt;
wherein the polymer particles intr…

Assignees

• Ekart Michael Paul
• Colhoun Frederick Leslie
• Jernigan Mary Therese
• Weinhold Stephen
• Armentrout Rodney Scott
• Eastman Chem Co

Inventors

• Ekart Michael Paul
• Colhoun Frederick Leslie
• Jernigan Mary Therese
• Weinhold Stephen
• Armentrout Rodney Scott

Classifications

• B29C49/0005

  Operations & Transport · mapped topic

• B29B2911/14033

  Operations & Transport · mapped topic

• B29C49/06

  Operations & Transport · mapped topic

• B29C51/002

  Operations & Transport · mapped topic

• B29B2911/1404

  Operations & Transport · mapped topic