Title:
METHOD FOR PRODUCING CROSSLINKED POLYMER PARTICLES, AND CROSSLINKED POLYMER GEL
Document Type and Number:
WIPO Patent Application WO/2021/049467
Kind Code:
A1
Abstract:
A method for producing crosslinked polymer particles comprising a coarse grinding step for coarse grinding a crosslinked polymer gel that has a structural unit derived from an ethylenically unsaturated monomer, wherein the gel hardness after polymerization, as obtained by the procedures (1) to (3) described below, is not less than 70 N but less than 450 N. (1) A test piece having a rectangular solid shape of 20 mm × 20 mm × 17 mm is obtained from the crosslinked polymer gel. (2) A flat surface of a jig having the flat surface is brought into contact with the 20 mm × 20 mm surface of the test piece from the upper side in the vertical direction. (3) An operation wherein the jig is pressed into the test piece by 15 mm in the vertical direction is performed, and the maximum value of the load undertaken by the jig during this operation is obtained as the above-described gel hardness after polymerization.
Inventors:
OKAZAWA SHIHO (JP)
Application Number:
PCT/JP2020/033833
Publication Date:
March 18, 2021
Filing Date:
September 07, 2020
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08F20/06; C08J3/12
Domestic Patent References:
| WO2018092864A1 | 2018-05-24 |
Foreign References:
| JP2019094444A | 2019-06-20 | |||
| JP2018164732A | 2018-10-25 | |||
| JP2018162455A | 2018-10-18 | |||
| JPH05339381A | 1993-12-21 | |||
| JP2018119142A | 2018-08-02 | |||
| JPH1067805A | 1998-03-10 | |||
| JPH09124879A | 1997-05-13 | |||
| JP2015530433A | 2015-10-15 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
Download PDF: