Swellable hydrogel-forming polymers having a low fraction of fines

• US 20070106239A1
• Filed: 12/17/2004
• Published: 05/10/2007
• Est. Priority Date: 12/19/2003
• Status: Active Grant

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Riegel, Ulrich, Daniel, Thomas, Elliott, Mark, Weismantel, Matthias, Hermeling, Dieter
• Granted Patent: US 7,553,903 B2
• Time in Patent Office: Days
• US Class Current: 604/367
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: C08G 63/20 Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
• CPC Class Codes: C08G 63/60 derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08L 2666/26 Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
• CPC Class Codes: C08L 5/00 Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 91/06 Waxes
• CPC Class Codes: C09D 179/02 Polyamines
• CPC Class Codes: Y10S 524/916 Hydrogel compositions

Abstract

Swellable hydrogel-forming polymer comprising at least one hydrophilic polymer of dendritic structure, a process for preparing the swellable hydrogel-forming polymer and also its use in hygiene articles.

Claims

1-16. -16. (canceled)

17. A swellable hydrogel-forming polymer comprising up to 10% by weight, based on the swellable hydrogel-forming polymer, of at least one hydrophilic polymer having a dendritic structure.

18. The polymer of claim 17 wherein said swellable hydrogel-forming polymer comprises at least 0.005% by weight of the hydrophilic polymer having a dendritic structure.

19. The polymer of claim 17 wherein the hydrophilic polymer having a dendritic structure comprises a polyester formed from a polyol and 2,2-dimethylolpropionic acid.

20. The polymer of claim 17 wherein the hydrophilic polymer having a dendritic structure comprises a polypropyleneimine, a polyamidoamine, or a polyesteramide.

21. The polymer of claim 17 further comprising a powdery additive, a dusty additive, or a mixture thereof.

22. The polymer of claim 21 wherein said additive is a metal salt, a pyrogenic silica, a polysaccharide, a nonionic surfactant, a wax, diatomaceous earth, or a mixture thereof.

23. The polymer of claim 21 wherein said additive is in a form of hollow microspheres from 1 to 1000 μ

m in diameter and having a wall thickness of 1% to 10% of said diameter.

24. The polymer of claim 17 comprising less than 50 weight ppm of particles less than 10 μ

m in diameter.

25. The polymer of claim 17 comprising less than 50 weight ppm of particles less than 10 μ

m in diameter after exposure to mechanical stress.

31. A method of absorbing blood or body fluids comprising contacting the blood or body fluids with a polymer of claim 17.

32. The method of claim 31 wherein the body fluid is urine.

33. A hygiene article comprising a polymer of claim 17.