Surgery – Means and methods for collecting body fluids or waste material – Absorbent pad for external or internal application and...
Patent
1996-10-29
1998-09-15
Foelak, Morton
Surgery
Means and methods for collecting body fluids or waste material
Absorbent pad for external or internal application and...
521 64, 521149, 604369, A61F 1316, C08J 928
Patent
active
058073612
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin composition which excels in the property of absorbing blood. More particularly, this invention relates to a blood-absorbable resin composition which is appropriately applied for sanitary napkins, tampons, medical blood-absorbable articles, trauma protectors, trauma healing materials, and reagents for treating liquid refuses from surgical operations.
BACKGROUND ART
In recent years, the absorbent resin has been finding extensive utility as one of the components for such sanitary materials as disposable diapers and sanitary napkins which are used for the purpose of absorbing body liquids.
As such absorbent resins, partially neutralized cross-linked polyacrylic acids (JP-A-55-84,304, JP-A-55-108,407, JP-A-55-133,413), hydrolyzed starch-acrylonitrile graft polymer (JP-A-46-43,995), neutralized starch-acrylic acid graft polymer (JP-A-51-125,468), saponified vinyl acetate-acrylic ester copolymers (JP-A-52-14,689), hydrolyzed acrylonitrile copolymers or acrylamide copolymers (JP-53-15,959) or products of cross-linkage thereof, and cross-linked cationic monomers (JP-A-58-154,709 and JP-A-58-154,710) have been known to the art, for example.
As the characteristics which the absorbent resins are expected to possess, high ratio of absorption capacity and high speed of absorption, excels in permeability to liquid, strength of the swelled gel, and large suction power of water from the substrate wet with an aqueous liquid may be cited, for example. These characteristics, however, do not invariably show positive correlation. For example, such physical properties as permeability to liquid, gel strength, and speed of absorption are lowered in proportion as the ratio of absorption capacity is heightened. As a means to improve the absorption characteristics of the absorbent resin in fine balance, the technique of cross-linking the neighborhood of surface of the absorption resin has been known. Various methods have been proposed to date concerning this technique. For example, methods using polyhydric alcohols (JP-A-58-180,233 and JP-A-61-16,903), methods using polyglycidyl compounds, polyaziridine compounds, polyamine compounds, and polyisocyanate compounds (JP-A-59-189,103), a method which uses glyoxal (JP-A-52-117,393), methods using polyvalent metals (JP-A-51-136,588, JP-A-61-257,235, and JP-A-62-7,745), methods using silane coupling agents (JP-A-61-211,305, JP-61-252,212, and JP-A-61-264,006), a method using an epoxy compound and a hydroxy compound (JP-A-02-132,103), and a method using an alkylene carbonate (DE-4020780) respectively as cross-linking agents have been known. Further, methods requiring the presence of inert inorganic powders (JP-A-60-163,956 and JP-A-60-255,814), a method requiring the presence of a dihydric alcohol (JP-A-01-292,004), a method requiring the presence of water and an ether compound (JP-A-02-153,903), and a method requiring the presence of the alkylene oxide adduct of a monohydric alcohol, an organic acid salt, and lactam (EP No. 555692) respectively during the course of the cross-linking treatment have been known to the art.
These methods accomplish the balanced improvement of the physical properties of the absorbent resin and the exaltation of the amount of an aqueous liquid to be absorbed by the absorbent resin under load to a certain extent. When the liquid to be absorbed happens to be blood, however, the amount of blood to be absorbed by the absorbent resin is unduly small because the components of the blood envelope the individual absorbent resin particles during the absorption of blood to interfere the absorption. Particularly for use in such articles as sanitary napkins, the absorbent resins known heretofore do not necessarily produce satisfactory results. For the purpose of improving the capacity of the absorbent resin for absorbing blood, it has been proposed to add such compounds as sodium chloride and polyethylene glycol to the absorbent resin (JP-A-58-501,107 and JP-A-54-70,694). Though the mutual adhesion of the particles
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Hatsuda Takumi
Kajikawa Katsuhiro
Nakamura Masatoshi
Foelak Morton
Nippon Shokubai Co. , Ltd.
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