[54] ABSORBENT RESIN, ABSORBENT MATERIAL AND METHOD OF MANUFACTURING THE SAME
[75] Inventors: Kunihiko Ishizaki, Suita; Hisanobu Obara, Ohda; Toshimasa Kitayania; Yoshihiro Motono, both of Himeji; Nobuyuki Harada, Suita, all of Japan
[73] Assignee: Nippon Shikubai Co., Ltd., Osaka,
Japan
[21] Appl. No.: 08/860,445
[22] PCT Filed: Oct. 31, 1996
[86] PCT No.: PCT/JP96/03191
§ 371 Date: Jun. 26, 1997
§ 102(e) Date: Jun. 26, 1997 [87] PCT Pub. No.: W097/16492
PCT Pub. Date: May 9, 1997
[30] Foreign Application Priority Data
Nov. 2, 1995 [JP] Japan 7-286266
Oct. 14, 1996 [JP] Japan 8-270917
[51] Int. CI.6 C08K 5/05
[52] U.S. CI 524/388; 521/141; 521/149;
524/556; 524/557
[58] Field of Search 524/388
[56] References Cited
U.S. PATENT DOCUMENTS
4,066,583 1/1978 Spaulding 260/17.4
4,691,782 9/1987 Stine 168/12
4,826,880 5/1989 Lesniak et al 521/53
4,920,202 4/1990 Irie et al 528/500
A water content of a water-containing gel of a hydrophilic cross-linked polymer is reduced by pressuring (calendaring) it. Then, a gel composition including, for example, a watercontaining gel including cross-linked poly(mefh)acrylic acid (salt), glycerol (polyhydric alcohol) and polyester fibers (auxiliary forming material), etc., is fed to a drum dryer on an upstream side of a pressurizing roller. Then, the resulting gel composition is pressurized (calendared) heated by a pressurizing roller to be formed into a sheet. As a result, a sheet-like absorbent material having at least one smooth surface can be obtained. The absorbent material resulting from the described method shows excellent properties and especially absorbing properties such as absorbing rate, absorbency under load, and shape retaining properties.
46 Claims, 4 Drawing Sheets
