Hydrophilic, open-cell, elastic foams with a melamine/formaldehyde resin base, production thereof and use thereof in hygiene products

US6800666B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Hans-Joachim Hähnle · Neustadt, DE
• Horst Baumgartl · Ludwigshafen, DE
• Martin H. Beck · Amherst, US
• Norbert Herfert · Charlotte, US
• Bernhard Mohr · Titting, DE
• Jürgen Huff · Ludwigshafen, DE

Key dates

• Filing date: Mar 10, 2003
• Grant date: Oct 5, 2004
• Expiry date: Apr 7, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2361/28
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Hydrophilic open-celled resilient foams containing melamine-formaldehyde resins, characterized by a droplet absorption rate of less than 5 seconds and an EU standard EN ISO 14184-1 formaldehyde emission of less than 100 mg of formaldehyde/kg of foam, and obtainable by(a) heating an aqueous solution or dispersion each containing at least a melamine-formaldehyde precondensate, an emulsifier, a blowing agent and a curing agent to form a foam and crosslink the precondensate,(b) then conditioning the foam at from 120 to 300° C. for from 1 to 180 minutes to remove volatiles, and(c) treating the foam during the conditioning or thereafter with at least one hydrophilicizer and/or with ozone, a corona discharge or a plasma,are useful in hygiene articles to acquire, distribute and immobilize body fluids.