Polyether polyols, polyol formulation containing them and their use in the production of hard polyurethane foams

US5840781A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl Werner Dietrich · Odenthal, DE
• Manfred Dietrich · Leverkusen, DE
• Wilhelm Lamberts · Cologne, DE
• Walter Klan · Leverkusen, DE

Key dates

• Filing date: Jul 15, 1997
• Grant date: Nov 24, 1998
• Expiry date: Jul 15, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Polyol formulations, containing polyether polyols possessing 40 to 80 wt % of tertiary amino groups and having an OH number of 300 to 500, preferably 350 to 420, obtainable by addition of exclusively propylene oxide to o-toluylenediamine, which contain cyclopentane and/or n- and/or i-pentane and/or hydrofluoro alkanes as blowing agent, are used for the manufacture of rigid polyurethane foams by reacting with organic polyisocyanates, optionally further compounds with at least two hydrogen atoms reactive to isocyanates, optionally in the presence of water, and further blowing agents known per se as well as conventional auxiliaries and additives.