Absorbent compositions, methods for producing thereof and absorbent products
AssigneeSanyo Chemical Industries, Ltd.
InventorsHitoshi Takai, Tsuyoshi Yuki, Shingo Mukaida, Daisuke Tagawa, Kenji Tanaka, Keiji Tanaka, Satoshi Tamabuchi, Yoshiyuki Iwasaki
Life of this patent
Estimating the term…
Abstract
An absorbent composition is produced by drying a mixture obtained by mixing a micro-filler (B) with a hydrogel having a water absorptive resin (A) and water. The hydrogel is produced by performing polymerization to produce the resin (A) and not drying the resin (A) after the polymerization. The absorbent composition has a specific surface area at least 10% lager than that of a reference composition produced by drying the hydrogel without the micro-filler (B).
Claims28
An absorbent composition produced by a method comprising drying a mixture obtained by mixing a micro-filler (B) with a hydrogel having a water absorptive resin (A) and water;
- said hydrogel being produced by performing polymerization without drying said hydrogel between said polymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogel;
- said absorbent composition having a specific surface area at least 10% larger than that of a reference composition produced by mixing said micro-filler (B) with a dried gel, said dried gel of said reference composition being produced by obtaining said hydrogel by performing said polymerization and drying said hydrogel between said polymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogel.
An absorbent composition comprising surface crosslinking particles containing a built-in micro-filler (B) obtained by a method comprising:
- obtaining particles by drying and grinding a mixture obtained by mixing said micro-filler (B) with a hydrogel having a water absorptive resin (A) and water, said hydrogel being produced by performing polymerization without drying said hydrogel between said polymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogel;
- and
- surface-crosslinking a surface and a proximity of said surface of each of said particles by using a crosslinking agent;
- said absorbent composition having a specific surface area at least 10% larger than that of a reference composition produced by mixing said micro-filler (B) with a dried gel, said dried gel of said reference composition being produced by obtaining said hydrogel by performing said polymerization and drying said hydrogel between said polymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogel.
An absorbent composition produced by a method comprising adding a surface active agent (C) to a surface of adsorptive particles whose main composition is a water absorptive resin (A) having a bulk density in the range of 0.1 to 0.55 g/cm3 and an average particle size in the range of 200 to 600 μm,
- said absorbent composition having an absorption speed for sheep blood that is 30 seconds or faster and a water retention amount after swelling in sheep blood for 30 minutes that is 20 g/g or more.
A method for producing an absorbent composition comprising:
- obtaining a mixture by mixing a micro-filler (B) having an apparent density of 5 g/cm3 or less with a hydrogel having a water absorptive resin (A) and water, said hydrogel being produced by performing polymerization without drying said hydrogel between said polymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogel;
- and
- drying said mixture.
An absorbent product comprising:
- an absorption layer having an absorbent composition and a fibrous material, said absorbent composition produced by a method comprising drying a mixture obtained by mixing a micro-filler (B) with a gydrogel having a water absorptive resin (A) and water;
- said hydrogel being produced by performing polymerization without drying said hysrogel betweeen said polymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogel;
- said absorbent composition having a specific surface area at least 10% larger tan that of a reference produced by mixing said micro-filler (B) with a dried gel. said dried gel o f said referejce composition being produced by obtaining said hydrogel by performing said polymerization and drying said hydrogel between said plymerization of said hydrogel and said mixing of micro-filler (B) with said hydrogels;
- adn
- a surface sheet covering said absorption layer, and having a water permeable portion.
Dependencies are inferred from the claim text.