Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1997-08-27
2000-06-06
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 56, 521 64, 604358, 604369, C08J 900
Patent
active
060719761
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to water absorbing agents, manufacturing methods thereof, and manufacturing machines thereof, the water absorbing agents being prepared by mixing a water absorbing resin containing a carboxyl group with a water solution of, for example, a crosslinking agent that can react with the carboxyl group, and being suitably used for sanitary goods such as, paper diapers (disposable diapers), sanitary napkins, and so-called incontinence pads.
BACKGROUND OF THE INVENTION
In recent years, water absorbing agents containing water absorbing resins have been used as components of sanitary goods such as, paper diapers (disposable diapers), sanitary napkins, and so-called incontinence pads for a purpose of absorbing body fluids.
Examples of well-known water absorbing resins include a partially neutralized and crosslinked polyacrylic acid, a hydrolyzed starch-acrylic acid graft polymer, a saponified vinyl acetate-acrylate copolymer, a hydrolyzed acrylonitrile copolymer or acrylamide copolymer, a crosslinked acrylonitrile copolymer or acrylamide copolymer, and a crosslinked cationic monomer.
A desirable water absorbing resin, when brought into contact with an aqueous liquid such as a body fluid, should exhibit excellent absorbency, absorbing rate, liquid permeability, gel strength of gel swollen with liquid, and suction force to suck the liquid from a base material containing the liquid. However, these characteristics are not necessarily correlated positively to one another. For example, a material boasting good absorbency is inferior in properties such as the liquid permeability, gel strength and absorbing rate.
It is known that those water absorbing characteristics of the water absorbing resin can be improved in a well-balanced manner by crosslinking the water absorbing resin in a neighborhood of the surface thereof, and various methods have been disclosed so far.
Examples are: a method of using a polyhydric alcohol as a crosslinking agent, disclosed in Japanese Laid-Open Patent Applications No. 58-180233/1983 (Tokukaisho 58-180233) and No. 61-16903/1986 (Tokukaisho 61-16903); a method of using a polyglycidyl compound, a polyfunctional aziridine, a polyfunctional amine compound, and a polyfunctional isocyanate compound as a crosslinking agent, disclosed in Japanese Laid-Open Patent Application No. 59-189103/1984 (Tokukaisho 59-189103); a method of using a glyoxal as a crosslinking agent, disclosed in Japanese Laid-Open Patent Application No. 52-117393/1977 (Tokukaisho 52-117393); a method of using a polyvalent metal as a crosslinking agent, disclosed in Japanese Laid-Open Patent Applications No. 51-136588/1976 (Tokukaisho 51-136588), No. 61-257235/1986 (Tokukaisho 61-257235) and No. 62-7745/1987 (Tokukaisho 62-7745); a method of using a silane coupling agent as a crosslinking agent, disclosed in Japanese Laid-Open Patent Applications No. 61-211305/1986 (Tokukaisho 61-211305), No. 61-252212/1985 (Tokukaisho 61-252212) and No. 61-264006/1985 (Tokukaisho 61-264006); and a method of using an alkylene carbonate as a crosslinking agent, disclosed in German Patent No. DE 40 20 780CI. Other examples are: a method of carrying out crosslinking reaction in the presence of inert inorganic particles, disclosed in Japanese Laid-Open Patent Applications No. 60-163956/1985 (Tokukaisho 60-163956) and No. 60-255814/1985 (Tokukaisho 60-255814); a method of carrying out crosslinking reaction in the presence of a dihydric alcohol, disclosed in Japanese Laid-Open Patent Application No. 1-292004/1989 (Tokukaihei 1-292004); a method of carrying out crosslinking reaction in the presence of water and an ether compound, disclosed in Japanese Laid-Open Patent Application No. 2-153903/1990 (Tokukaihei 2-153903); and a method of carrying out crosslinking reaction in the presence of an addition product of alkylene oxide to a monohydric alcohol, an organic acid salt, lactam, or the like, disclosed in European Patent No. EP 0 555 692 AI.
Generally, the water absorbing resin preferably contains as few
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Dairoku Yorimichi
Ishizaki Kunihiko
Kitayama Toshimasa
Murakami Takanori
Nagasuna Kinya
Foelak Morton
Nippon Shokubai Co. , Ltd.
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