	US 7,511,083 B2
	Hydrogel
Flemming Madsen, Klampenborg (Denmark); and Niels Joergen Madsen, Alleroed (Denmark)
Assigned to Coloplast A/S, Humlebaek (Denmark)
Appl. No. 10/529,555 PCT Filed Oct. 02, 2003, PCT No. PCT/DK03/00655 § 371(c)(1), (2), (4) Date Mar. 29, 2005, PCT Pub. No. WO2004/031253, PCT Pub. Date Apr. 15, 2004.
Claims priority of application No. 2002 01478 (DK), filed on Oct. 02, 2002.
Prior Publication US 2006/0052478 A1, Mar. 09, 2006
Int. Cl. C08J 3/28 (2006.01); C08F 2/46 (2006.01)

U.S. Cl. 522—24 [522/85; 522/60; 522/49]

11 Claims

1. A method of preparing a cross-linked hydrogel by graft polymerization, comprising the steps of:

(1) preparing an aqueous solution having at least one saturated hydrophilic polymer component;

(2) adding a cross-linking agent at a concentration between about 1 wt % and about 30 wt %, wherein the cross-linking agent is selected from the group consisting of di- or multifunctional acrylates and methacrylates;

(3) adding a water soluble peroxydisulphate photoinitiator having a concentration of between about 0.1 wt % to 1.25 wt %;

(4) initiating the crosslinking of the polymer component in said solution by exposing the aqueous solution to ultraviolet (UV) irradiation; and

wherein the curing time for the hydrogel is less than about 5 minutes.