Process for producing hydrocarbon-blown hard polyurethane foams

US5962542A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karl Werner Dietrich · Odenthal, DE
• Norbert Eisen · Hanerau-Hademarschen, DE
• Gerhard Heilig · Bensberg, DE

Key dates

• Filing date: Sep 18, 1998
• Grant date: Oct 5, 1999
• Expiry date: Sep 18, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing rigid expanded materials containing urethane and optionally urea and isocyanurate groups, characterised in that a polyurethane rigid foam is prepared by reacting PA1 a) an aromatic polyisocyanate with PA1 b) a polyol component with on average at least 3 hydrogen atoms which can react with isocyanates, containing PA2 1) 30 to 80 wt. % of an aromatic amine started polyether with a molecular weight of 300 to 800 based on 70 to 100 wt. % of 1,2-propylene oxide and 0 to 30 wt. % of ethylene oxide PA2 2) 10 to 40 wt. % of a substantially sucrose started polyether with a molecular weight of 400 to 1,000 based on 70 to 100 wt. % of 1,2-propylene oxide and 0 to 30 wt. % of ethylene oxide PA2 3) 5 to 30 wt. % of a propylene glycol started polyether with a molecular weight of 500 to 1,500 based on 70 to 100 wt. % of 1,2-propylene oxide and 0 to 30 wt. % of ethylene oxide PA2 4) n-pentane and/or i-pentane as blowing agent PA2 5) water PA2 6) optional auxiliary agents and additives, wherein the sum of the wt. % of components 1), 2) and 3) is 100, is described.