PRODUCTION OF POLYETHYLENE TEREPHTHALATE RESIN HAVING HIGH VISCOSITY

Title:

PRODUCTION OF POLYETHYLENE TEREPHTHALATE RESIN HAVING HIGH VISCOSITY

Document Type and Number:

Japanese Patent JPH11166040

Kind Code:

A

Abstract:

To convert a low-viscosity polyester such as reclaimed polyester resin product and off-grade polyester resin into a high-viscosity polyester.

An aromatic tetracarboxylic acid dianhydride is added in an amount of 0.1-2 pts.wt. to 100 pts.wt. of a polyethylene terephthalate resin and the mixture is melted and kneaded with a twin-screw extruder having ≥3 kneading zones. The kneading zone of the twin-screw extruder is preferably composed of a combination of a back-feeding flight or a back-feeding kneading disk at the resin extrusion side and at least one kneading disk at the resin feeding side.

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Inventors:

YANAGASE AKIRA
FUJIMOTO MASAHARU
UEDA TERUSHI
OSAKO NOBUYUKI

Application Number:

JP35015897A

Publication Date:

June 22, 1999

Filing Date:

December 05, 1997

Export Citation:

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Assignee:

MITSUBISHI RAYON CO

International Classes:

B29C48/57; C08J3/20; B29B7/48; B29C48/40; B29C48/55; C08G63/127; C08J5/00; C08J11/06; C08K5/092; C08L67/02; (IPC1-7): C08G63/127; B29B7/48; B29C47/40; C08J3/20; C08J5/00; C08J11/06; C08K5/092; C08L67/02

Attorney, Agent or Firm:

Toshio Yoshizawa

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