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| Patch |
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Water-absorptive resin composition
| Details |
Inventors: Doi, Shuhei; Ohnishi, Shunichi;
Assignee: Mitsubishi Pertochemical Co., Ltd. (Tokyo, JP)
Primary Examiner: Seccuro; Carman J.
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt
A water-absorptive resin composition which comprises (A) 5 to 95% by weight of a water-absorptive resin and 95 to 5% by weight of (B) a polyolefin resin and (C) an ethylene/.alpha.-olefin copolymer rubber, based on the total contents of said components (A), (B) and (C), wherein the content of said component (C) amounts to 20 to 80% by weight based on the total contents of said components (B) and (C) is disclosed. This water-absorptive resin composition is moldable and has an excellent water absorption property and an excellent water-absorptive resin retention characteristic after absorbing water. |
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DETAILED DESCRIPTION OF THE INVENTION Examples of the water-absorptive resin to be employed as the component (A) include starch derivatives such as alkali metal salts of starch/(meth)acrylic acid graft copolymer, hydrolyzed starch/(meth)acrylates graft copolymer, saponified starch/(meth)acrylonitrile graft copolymer and saponified starch/(meth)acrylamide graft copolymer; cellulose derivatives such as carboxymethyl cellulose, saponified cellulose/(meth)acrylonitrile graft copolymer and alkali metal salts of cellulose/(meth)acrylic acid graft copolymer; polyacrylic acid derivatives such as alkali metal poly(meth)acrylates and alkali metal salts of (meth)acrylic acid/(meth)acrylamide copolymer; polyvinyl alcohol derivatives such as alkali metal salts of polyvinyl alcohol/(meth)acrylic acid graft copolymer and polyvinyl alcohol/maleic anhydride graft copolymer; alkali metal salts of vinyl acetate/(meth)acrylic acid copolymer and isobutylene/maleic anhydride copolymer.
Preferred examples of the water-absorptive resin to be employed as the component (A) include alkali metal salts of starch/acrylic acid graft copolymer and alkali metal polyacrylates.
It is preferable that these resins are crosslinked.
Typical examples of the polyolefin resin to be employed as the component (B) include polyethylene, polypropylene, ethylene/propylene copolymer, ethylene/ 1-butene copolymer, propylene/1-butene copolymer, ethylene/vinyl acetate copolymer, ethylene/(meth)acrylic acid copolymer and ethylene/(meth)acrylates copolymer.
Preferred examples of the polyolefin resin to be employed as the component (B) include ethylene/vinyl acetate copolymer and polypropylene.
Examples of the ethylene/a-olefin copolymer rubber to be employed as the component (C) include ethylene/propylene copolymer rubber, ethylene/1-butene copolymer rubber and a copolymer rubber obtained by copolymerization of the monomers for the aforesaid rubber with an unconjugated diene such as dicyclopentadiene, 1,4-hexadiene or ethylidenenorbornene
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Weight Loss and Supplements 
