Title:
EXPANDED POLYPROPYLENE-BASED-RESIN PARTICLES AND METHOD FOR PRODUCING MOLDED EXPANDED-PARTICLE OBJECT
Document Type and Number:
WIPO Patent Application WO/2023/063081
Kind Code:
A1
Abstract:
A method for producing expanded polypropylene-based-resin particles (1) each having a through-hole (11), by conducting a first-stage expansion step and a second-stage expansion step. In the first-stage expansion step, cylindrical resin particles containing carbon black and each having a though-hole are dispersed in a dispersion medium and the dispersion is discharged into a low-pressure atmosphere to expand the particles, thereby obtaining first-stage-expanded particles having a bulk expansion ratio of M1. In the second-stage expansion step, the first-stage-expanded particles are further expanded to obtain expanded polypropylene-based-resin particles having a bulk expansion ratio of M2. The bulk expansion ratio M1 is 5 to 25. The ratio of the bulk expansion ratio M2 to the bulk expansion ratio M1, M2/M1, is 1.2-3.0.
Inventors:
SAKAMURA TAKUMI (JP)
OHTA HAJIME (JP)
OHTA HAJIME (JP)
Application Number:
PCT/JP2022/036167
Publication Date:
April 20, 2023
Filing Date:
September 28, 2022
Export Citation:
Assignee:
JSP CORP (JP)
International Classes:
C08J9/18; B29C44/00; B32B1/00; B32B1/08; B32B27/32
Domestic Patent References:
| WO2016027892A1 | 2016-02-25 | |||
| WO2021157369A1 | 2021-08-12 | |||
| WO2016060162A1 | 2016-04-21 |
Foreign References:
| JP2012126816A | 2012-07-05 | |||
| JP2018162369A | 2018-10-18 | |||
| JPH07300537A | 1995-11-14 | |||
| JP2015143046A | 2015-08-06 |
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (JP)
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