US 5,508,370 AGranted

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

AssigneeBayer Aktiengesellschaft

InventorsHelmut Reiff, Karl-Heinz Passon, Hans-Albert Ehlert, Peter Nussbaum

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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 (a) organic polyisocyanates, (b) NCO-reactive compounds containing ionic or potentially ionic groups, (c) polyalkylene ethers, (d) NCO-blocking agents, and (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.

Claims6

Dependent claims

A water-repellent/oil-repellent agent for finishing textiles comprising

(I) a blocked polyisocyanate having an NCO functionality of from 2.2 to 4.5 and an average molecular weight of 800 to 5000 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 milliequivalents of ionic groups per 100 g of blocked polyisocyanate, and
(3) to 40 wt. % of polyalkylene oxide units relative to the blocked polyisocyanate,
wherein said blocked polyisocyanate is prepared by a process comprising reacting
(a) an organic polyisocyanate,
(b) an NCO-reactive compound containing ionic or potentially ionic groups,
(c) a polyalkylene ether,
(d) an NCO-blocking agent other than an alkali metal bisulfite, and
(e) optionally, other NCO-reactive compounds different from components (b), (c), and (d),
wherein said process is carried out by reacting components (a), (b), (c) and, optionally, (e) to form an unblocked polyisocyanate containing incorporated polyalkylene oxide units and ionic groups and then reacting said unblocked polyisocyanate with NCO-blocking agent (d) to form the blocked polyisocyanate, and
(II) one or more fluorinated organic compounds.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/135,642Filed 12 Oct 1993 · continuation in part
Priority: DE 41 34 284.417 Oct 1991
Granted: 16 Apr 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

D06M 15/568
Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them: reaction products of…
C08G 18/0804
Processes: manufacture of polymers containing ionic or ionogenic groups
C08G 18/0819
Manufacture of polymers containing ionic or ionogenic groups: containing anionic or anionogenic groups
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step