Thermally stable rigid foams based on isocyanate and having low brittleness and low thermal conductivity

US6284812A · kind A · utility

Assignee

• BASF SE

Inventors

• Udo Rotermund · Ortrand, DE
• Renate Hempel · Ruhland, DE
• Holger Seifert · Bad Driburg, DE
• Werner Schmiade · Lembruch, DE

Key dates

• Filing date: Sep 24, 1998
• Grant date: Sep 4, 2001
• Expiry date: Sep 24, 2018

Classification

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

Abstract

Thermally stable rigid foams based on isocyanate can be produced by reacting PA1 a) polyisocyanates with PA1 b) compounds containing at least two hydrogen atoms which can react with isocyanate groups, PA1 c) water, in the presence of PA1 d) physically acting blowing agents, in the presence or absence of PA1 e) catalysts and auxiliaries and/or additives, wherein the component b) comprises PA2 bi) at least one polyether alcohol having a functionality of at least 1.5 and a hydroxyl number of from 10 to 100 mg KOH/g in an amount of from 0.2 to 80% by mass, based on b), and PA2 bii)at least one polyester alcohol in an amount of from 5 to 90% by mass, based on b), PA3 the water c) is present in an amount of at most 2% by mass, based on the sum of the components b) to e), and the component d) used comprises hydrocarbons and/or fluorine-containing hydrocarbons in an amount of from 5 to 30% by mass, based on the sum of the components b) to e).