Title:
ポリエステルシートの製造方法
Document Type and Number:
Japanese Patent JP3577184
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enhance the adhesion of a polyester sheet to the surface of a rotary cooling drum and, at the same time, suppress the lowering of the intrinsic viscosity of the polyester sheet by a method wherein a metal salt is added to the polyester, the polymerization of which has finished. SOLUTION: Magnesium decanedicarboxylate is added to polyester, the specific resistance of which is 1×10<7> Ωcm or more, so as to realize the magnesium atom density in the polyester of 0.5-1,000ppm. The above-mentioned mixture is melted in a vent type twin-screw extruder and, in succession, extruded from a mouthpiece in a sheet-like fashion through a gear pump so as to electrostatically bond to the surface of a rotary cooling drum by means of wire electrodes in order to obtain a sheet. Thus, the specific resistance is reduced under the condition that the lowering of the degree of polymerization of the polyester after melt-extrusion is checked as small as possible so as to produce a high quality polyester sheet at high productivity.
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Inventors:
Takafumi Miki
Application Number:
JP32915996A
Publication Date:
October 13, 2004
Filing Date:
November 25, 1996
Export Citation:
Assignee:
Mitsubishi Chemical Polyester Film Co., Ltd.
International Classes:
C08J5/18; B29C48/405; B29C48/41; B29C48/76; B29C48/92; B29K67/00; B29L7/00; (IPC1-7): B29C47/88; B29C47/10; B29C47/92
Domestic Patent References:
| JP4064328B2 | ||||
| JP4087228U |
Foreign References:
| WO1991004856A1 |
Attorney, Agent or Firm:
Kazuhiko Okada