Title:
CONTAINER MADE OF PROPYLENE POLYMER EXCELLING IN IMPACT RESISTANCE AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP3802970
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a container formed by draw and blow molding made of propylene polymer wherein defect of drawing blow-molded container of propylene polymer produced by cold parison process is cleared and impact resistance is remarkably improved, and a method for its manufacture.
SOLUTION: Relating to a container 21 formed by drawn blow molding of a bottomed preform which consists of a propylene polymer and having a neck part which is virtually not yet drawn, and a barrel part 24 and a bottom part 25 which are both drawn, a difference (d) in birefringence between the inner surface and the outer surface of the barrel part 24, defined by an equation d=&verbar Δ0-ΔI&verbar (provided that Δ0=NZ0-NX0 and ΔI=NZI-NXI and in which NZ0 is a refractive index in the direction of height at the outer surface of the barrel part, NX0 is a refractive index in the direction of thickness at the outer surface of the barrel part, NZI is a refractive index in the direction of height at the inner surface of the barrel part, and NXI is a refractive index in the direction of thickness at the inner surface of the barrel part) should be 0.0025 or less in terms of absolute value.
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Inventors:
Koichi Kawaguchi
Yuto Watanabe
Imoda Daisuke
Yuto Watanabe
Imoda Daisuke
Application Number:
JP14932397A
Publication Date:
August 02, 2006
Filing Date:
June 06, 1997
Export Citation:
Assignee:
Toyo Seikan Co., Ltd.
International Classes:
B65D1/02; (IPC1-7): B65D1/02
Domestic Patent References:
| JP911325A |
Attorney, Agent or Firm:
Naozumi Ono
Sachiko Okunuki
Sachiko Okunuki