Polyurethane-based thickeners for aqueous compositions

US5612408A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Konig · Leverkusen, DE
• Jurgen Schwindt · Leverkusen, DE
• Jan Mazanek · Cologne, DE
• Josef Pedain · Cologne, DE
• Manfred Dietrich · Leverkusen, DE
• Gerhard Klein · Monheim, DE
• Karl-Roland Jerg · Neunburg vorm Wald, DE

Key dates

• Filing date: Jan 29, 1996
• Grant date: Mar 18, 1997
• Expiry date: Jan 29, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L75/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of polyurethanes suitable for use as thickeners for aqueous compositions by reacting at an NCO/OH equivalent ratio of 0.9:1 to 1.2:1 PA1 a) a polyether component having an OH number of 10 to 30 mg KOH/g and obtained by the alkoxylation of a mixture of PA2 a1) 30 to 80 mole % of a monofunctional alcohol or alkylphenol having 8 to 30 carbon atoms, PA2 a2) 2 to 10 mole % of sodium hydroxide or potassium hydroxide, PA2 a3) 10 to 60 mole % of water and PA2 a4) 0 to 10 mole % of a trihydric to hexahydric alcohol having a molecular weight of 92 to 600, PA1 with ethylene oxide or a mixture of ethylene oxide with up to 20 mole %, based on the total moles of alkylene oxides, of propylene oxide, in which the percentages of a1) to a4) add up to 100, with PA1 b) a polyisocyanate component containing at least one organic diisocyanate, optionally in admixture with up to 20 mole %, based on the total moles of component b), of higher than difunctional polyisocyanates. The invention also relates to the polyurethanes obtainable by this method and their use, optionally in combination with other thickeners, for the thickening of aqueous sys…