Water-dispersible blocked isocyanates, method of manufacture, and use thereof

US5693737A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Helmut Reiff
• Karl-Heinz Passon · Leverkusen, DE
• Hans-Albert Ehlert · Leverkusen, DE
• Peter Nussbaum · Leverkusen, DE

Key dates

• Filing date: Jan 19, 1996
• Grant date: Dec 2, 1997
• Expiry date: Jan 19, 2016

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06M15/277
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a blocked polyisocyanate having an NCO functionality of from 2.2 to 4.5 and an average molecular weight of 800 to 25,000 and containing (1) blocked isocyanate groups corresponding to an NCO content of 5 to 20 wt. % calculated as free NCO, relative to unblocked polyisocyanate, (2) 1 to 75 meq of ionic groups per 100 g of blocked polyisocyanate, and (3) 3 to 40 wt. % of polyalkylene oxide units relative to the blocked polyisocyanate prepared by the reaction of PA1 (a) organic polyisocyanates, PA1 (b) NCO-reactive compounds containing ionic or potentially ionic groups, PA1 (c) polyalkylene ethers, PA1 (d) NCO-blocking agents, and PA1 (d) optionally, other NCO-reactive compounds different from components (b), (c) and (d), wherein said process is carried out by either (A) reacting components (a), (b), (c) and, optionally, (e) to form an unblocked polyisocyanate intermediate and then reacting the intermediate with NCO-blocking agent (d) other than an alkali metal bisulfite to form the blocked polyisocyanate, or (B) reacting components (a), (c) and, optionally, (e) with an alkali-metal bisulfite to form the blocked polyisocyanate.