Absorbent article
First Claim
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1. An absorbent article obtained by mixing 100 parts by weight of a powder of an absorbent resin having a carboxyl group selected from the group consisting of hydrolyzate of starch/acrylonitrile graft copolymer;
- partial neutralization product of starch/acrylic acid graft copolymer;
saponification product of vinyl acetate/acrylic ester copolymer;
hydrolyzate of acrylonitrile copolymers;
hydrolyzate of acrylamide copolymer;
crosslinked product of any of the foregoing copolymers;
partial neutralization product of polyacrylic acid; and
crosslinked partial neutralization product of polyacrylic acid;
with 0.001 to 10 parts by weight of a crosslinking agent having at least two functional groups capable of reacting with the carboxyl group per molecule and reacting the absorbent resin powder with the crosslinking agent to crosslink the molecular chains existing at least in the vicinity of the surface of the absorbent resin powder.
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Abstract
An absorbent article obtained by mixing 100 parts by weight of an absorbent resin powder having a carboxyl group with 0.001 to 10 parts by weight of a crosslinking agent having at least two functional groups capable of reacting with the carboxyl group per molecule and reacting the absorbent resin powder with the crosslinking agent to crosslink the molecular chains existing at least in the vicinity of the surface of the absorbent resin powder.
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Citations
26 Claims
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1. An absorbent article obtained by mixing 100 parts by weight of a powder of an absorbent resin having a carboxyl group selected from the group consisting of hydrolyzate of starch/acrylonitrile graft copolymer;
- partial neutralization product of starch/acrylic acid graft copolymer;
saponification product of vinyl acetate/acrylic ester copolymer;
hydrolyzate of acrylonitrile copolymers;
hydrolyzate of acrylamide copolymer;
crosslinked product of any of the foregoing copolymers;
partial neutralization product of polyacrylic acid; and
crosslinked partial neutralization product of polyacrylic acid;
with 0.001 to 10 parts by weight of a crosslinking agent having at least two functional groups capable of reacting with the carboxyl group per molecule and reacting the absorbent resin powder with the crosslinking agent to crosslink the molecular chains existing at least in the vicinity of the surface of the absorbent resin powder. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 23, 24, 25, 26)
- partial neutralization product of starch/acrylic acid graft copolymer;
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2. An absorbent article obtained by mixing 100 parts by weight of a powder of an absorbent resin having a carboxyl group with 0.001 to 10 parts by weight of a crosslinking agent having at least two functional groups capable of reacting with the carboxyl groups per molecule and reacting the absorbent resin powder with the crosslinking agent to crosslink the molecular chains existing at least in the vicinity of the surface of the absorbent resin powder;
- wherein the absorbent resin having a carboxyl group is an alkali metal acrylate-type polymer obtained by copolymerizing 100 parts by weight of an acrylic acid salt-type monomer composed of 1 to 50 mole% of acrylic acid and 50 to 99 mole% of an alkali metal acrylate and 0 to 5 parts by weight of a crosslinkable monomer in aqueous solution in a monomer concentration of at least 20% by weight, and drying the resulting gel-like hydrous polymer under heat.
- View Dependent Claims (14, 15, 16, 17, 18)
- 19. An absorbent article which is a reaction product of 100 parts by weight of a powder of an absorbent resin which is a saponified copolymer of vinyl acetate and methylacrylate with 0.001 to 10 parts by weight of a crosslinking agent which is trimethylol propane wherein at least the molecular chains existing at least in the vicinity of the surface of the absorbent resin powder are crosslinked.
- 20. An absorbent article which is a reaction product of 100 parts by weight of a powder of an absorbent resin which is a crosslinked copolymer of isobutylene and maleic anhydride with 0.001 to 10 parts by weight of a crosslinking agent which is polyethylene glycol wherein at least the molecular chains existing at least in the vicinity of the surface of the absorbent resin powder are crosslinked.
Specification