Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-11-17
1996-10-22
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523201, 523205, 523206, 428357, 42840224, 428407, 4284231, C08K 900, C08F 600, C08G 6100, C08L 8300
Patent
active
055677444
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a high water-absorbent resin composition prepared by forming a composite by fusing or fixing a thermoplastic resin onto the surface of a high water-absorbent resin. The high water-absorbent resin composition obtained by the present invention has enhanced adhesion. For example, when the high water-absorbent resin composition of the present invention is used in adhesion to fibrous base materials such as various nonwoven fabrics, pulps or papers, it provides a high water-absorbent material which is not detached from the fibrous base materials even after which the high water-absorbent resin absorbs water.
BACKGROUND ART
The high water-absorbent resin is a functional resin capable of absorbing and retaining water from several dozens to 1000 times the weight thereof, and because of this property, it is widely utilized in hygienic materials such as paper diapers and sanitary napkins and agricultural and horticultural materials.
However, these high water-absorbent resins are usually in the form of powders having no adhesion, and in order to use them in the above-mentioned applications, the mentioned resin is spread over fibrous base materials such as nonwoven fabrics, pulps or papers to obtain a water-absorbent material with a sandwich structure. In this case, in order to fix the high water-absorbent resin to the base material, a method comprising slightly swelling the resin by water spraying and then subjecting the swollen resin to embossing or press drying using a roll is normally carried out.
However, the conventional method for fixing the high water-absorbent resin mentioned above has some drawbacks as mentioned below. Specifically, in the method for fixing a high water-absorbent resin to a fibrous base material by water spraying, etc., the insufficient adhesion to the base material results in gel detachment upon water absorption, so that the amount of the high water-absorbent resin to be added for the prevention of the gel detachment is limited. Also, in the case where the water is used, a drying process becomes necessary for subsequent water removal, and at the same time, the touch of the product is affected.
An object of the present invention is to provide a high water-absorbent resin composition having enhanced adhesion to the base material by giving adhesion to the high water-absorbent resin having non-thermoplasticity, which is not detached from the fibrous base material mentioned above even after the high water-absorbent resin absorbs water in the case where it is used in the thermal adhesion to fibrous base materials, such as nonwoven fabrics, pulps or papers.
DISCLOSURE OF THE INVENTION
As a result of intense investigations in view of the above-mentioned circumstances, the present inventors have found that the desired object of the present invention can be accomplished by forming a composite by fusing or fixing a thermoplastic resin directly or via an adhesive binder onto the surface of a high water-absorbent resin, and thus have completed the present invention.
Specifically, the gist of the present invention is concerned with: composite by fusing or fixing a thermoplastic resin onto a surface of a high water-absorbent resin via an adhesive binder, wherein the composition comprises from 1 to 100 parts by weight of the thermoplastic resin and from 1 to 75 parts by weight of the solid component of the adhesive binder, based on 100 parts by weight of the high water-absorbent resin; composite by fusing or fixing a thermoplastic resin onto a surface of a high water-absorbent resin, wherein the composition comprises from 1 to 100 parts by weight of the thermoplastic resin, based on 100 parts by weight of the high water-absorbent resin; adhesive binder used is a urethane adhesive; high water-absorbent resin used has an average grain size of from 5 to 1000 .mu.m, and the thermoplastic resin is a granular product having an average grain size of from 1 to 800 .mu.m, or a fibrous product having an average diameter of from 1 to 400 .mu.m and an average lengt
REFERENCES:
Abstract of JP-A-57 178 746, publication date Nov. 4, 1982.
Abstract of JP-A-2 172 739, publication date Jul. 4, 1990.
Abstract of JP-A-63 172 645, publication date Jul. 16, 1988.
Hashimoto Naoyuki
Ishikawa Hiroki
Nagata Manabu
Takemori Shinichi
Yamada Yozo
Michl Paul R.
Niland Patrick
Sumitomo Seika Chemicals Co. Ltd.
Uni-Charm Corporation
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