Title:
PRODUCTION METHOD OF RESIN PIPE, RESIN PIPE, AND PIPELINE CONNECTION STRUCTURE
Document Type and Number:
Japanese Patent JP2019099647
Kind Code:
A
Abstract:
To provide an extrusion molded resin pipe having air bubbles that do not substantially communicate in a direction parallel to an extrusion direction provided in a foam layer by using chemical foaming method at low cost.SOLUTION: A resin pipe 100 is produced according to a production method including: a step of making 2 wt.% or more of microcapsules having a swell start temperature of 120°C or higher as a foaming agent contained in a resin before resin molding; and a step of resin molding such that an expansion ratio becomes larger than 2.3 times. The resin pipe has an outer periphery surface (a part of a thickness t) constituted of an outer layer 110 that is an external surface of an outer periphery surface, an inner layer 120 that is an inner surface of the outer periphery surface, and a foaming layer 130 formed between the outer layer 110 and the inner layer 120, the outer layer 110 and the inner layer 120 constitute a non-foaming layer, and air bubbles of the foaming layer 130 do not substantially communicate in a direction parallel to the extrusion direction.SELECTED DRAWING: Figure 2
Inventors:
OSHIMO SHINZABURO
HOSOE NAOKI
HAYASHI MAYA
HOSOE NAOKI
HAYASHI MAYA
Application Number:
JP2017230370A
Publication Date:
June 24, 2019
Filing Date:
November 30, 2017
Export Citation:
Assignee:
KUBOTA CHEMIX CO LTD
International Classes:
C08J9/32; C08J3/22; C08J9/10; C08K5/23; C08K9/10; C08L101/00; F16L11/04
Domestic Patent References:
| JP2014070674A | 2014-04-21 | |||
| JP2015096314A | 2015-05-21 | |||
| JP2007533771A | 2007-11-22 | |||
| JP2018059707A | 2018-04-12 |
Attorney, Agent or Firm:
Mikio Yasuda