US 8,568,883 B2 · Superabsorbent polymer particles with improved surface cross-linking and improved hydrophilicity and method of making them using vacuum UV radiation

Abstract

The present invention relates to superabsorbent polymer particles with improved surface cross-linking and improved hydrophilicity and their use in absorbent articles. Superabsorbent polymer particles of the invention consist of cross-linked poly(meth)acrylic acid and salts thereof. The polymer chains comprised by the superabsorbent polymer particles are cross-linked to each other through direct covalent bonds and comprise alcoholic hydroxyl groups. Moreover, the invention relates to a method for surface cross-linking superabsorbent polymer particles using vacuum UV irradiation.

Claims8

Dependent claims

A method of surface cross-linking superabsorbent polymer particles which comprises the steps of

a) providing superabsorbent polymer particles comprising polymer chain segments, the polymer chain segments comprising poly(meth)acrylic acid and salts thereof, each superabsorbent polymer particle having a surface and a core, and
b) cross-linking the polymer chain segments by exposing said superabsorbent polymer particles to irradiation with vacuum UV radiation having a wavelength of from about 100 nm to about 200 nm.

Dependencies are inferred from the claim text.

Facts

Application

11/298,416Filed 8 Dec 2005

Priority

EP 0402932110 Dec 2004

Published

US 2006/0128902 A115 Jun 2006

Granted

29 Oct 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C08J 3/28
Processes of treating or compounding macromolecular substances: treatment by wave energy or particle radiation
C08J 3/245
Crosslinking, e.g. vulcanising, of macromolecules: differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
C08J 2333/02
Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one…:…
Y10T 428/2998
Coated: including synthetic resin or polymer

Superabsorbent polymer particles with improved surface cross-linking and improved hydrophilicity and method of making them using vacuum UV radiation

Life of this patent

Superabsorbent polymer particles with improved surface cross-linking and improved hydrophilicity and method of making them using vacuum UV radiation

Life of this patent

Abstract

Claims8