Method for making low density polyurethane foam for sound and vibration absorption

US8883934B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Helmut Stegt · Ahlen, DE
• Allan James · Riddells Creek, AU
• Stephen Burks · Lake Jackson, US
• Jason A. Reese · Londonderry, US
• David J. Honkomp · Covington, US

Key dates

• Filing date: Dec 7, 2010
• Grant date: Nov 11, 2014
• Expiry date: Nov 5, 2031

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2650/24
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Flexible polyurethane foams that function well in noise and vibration absorption applications are made from a mixture of polyether polyols oxides that each has a hydroxyl equivalent weight of from 1200 to 3000 and at least 70% primary hydroxyl groups. From 5 to 80% by weight of the ethylene oxide-capped polypropylene oxides are nominally difunctional, from 0.5 to 20% by weight of the ethylene oxide-capped polypropylene oxides have a nominal functionality of four or higher, and the balance of the ethylene oxide-capped polypropylene oxides, but not less than 1.5% by weight thereof, are nominally trifunctional.