Title:
FILTER AID, AND FILTER AND HYGIENE PRODUCT CONTAINING FILTER AID
Document Type and Number:
WIPO Patent Application WO/2020/213208
Kind Code:
A1
Abstract:
[Problem] Conventionally known filter aids include those made of a cellulose powder, those in which diatomaceous earth is used, and adsorbents in which an amino group is utilized. However, the filter aids were not necessarily satisfactory; for example, there was a lack of improvement in the filtrate clarity when treating liquids having a high turbidity, and there were concerns regarding safety and the disposal method after use. The present invention was developed in view of the current state of the prior art, and the purpose thereof is to provide a filter aid having a superior performance compared to conventional materials, and a filter containing the filter aid. [Solution] A filter aid comprising an acrylonitrile polymer containing at least 70 wt% of acrylonitrile units and 0.05-2.0 mmol/g of amino groups or ammonium groups, and having a specific surface area of 0.1-400 m2/g.
Inventors:
KOMIYAMA TAKUZO (JP)
Application Number:
PCT/JP2019/048394
Publication Date:
October 22, 2020
Filing Date:
December 11, 2019
Export Citation:
Assignee:
JAPAN EXLAN CO LTD (JP)
International Classes:
B01J20/26; B01D37/02; C08F20/44
Foreign References:
| JPS4724278B1 | 1972-07-05 | |||
| JPS5327257A | 1978-03-14 | |||
| JPS54113954A | 1979-09-05 | |||
| JPH07185333A | 1995-07-25 | |||
| JPS57153648A | 1982-09-22 |
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