Title:
ポリ乳酸から成る容器の製造方法
Document Type and Number:
Japanese Patent JP7127338
Kind Code:
B2
Abstract:
To provide the method for manufacturing the container made of polylactic acid, that can solve problems peculiar to polylactic acid generated when a container made of polylactic acid is manufactured by hot melt molding, such as degradation of a resin due to hydrolysis, generation of acetaldehyde (AA) that is estimated to be derived from end carboxyl groups, and decrease in crystallinity due to optically active isomer transition (racemization) of optically active isomers.SOLUTION: The method for manufacturing the container by the hot melt molding comprises using polylactic acid having an optically active isomer (D) content of 4% or less, wherein polylactic acid supplied to a hot melt molding process has a moisture content ranging from 20 ppm to 100 ppm.SELECTED DRAWING: None
Inventors:
Takuro Ito
Hiroki Kunieda
Hiroki Kunieda
Application Number:
JP2018074408A
Publication Date:
August 30, 2022
Filing Date:
April 09, 2018
Export Citation:
Assignee:
Toyo Seikan Group Holdings Co., Ltd.
International Classes:
B29B13/06; B29B11/08; B29C45/78; B29C49/06
Domestic Patent References:
| JP2009073955A | ||||
| JP2002017170A | ||||
| JP2007118350A |
Foreign References:
| WO2003008178A1 |
Attorney, Agent or Firm:
Naozumi Ono
Okunuki Sachiko
Okunuki Sachiko