Prerparation of aqueous polyurethane dispersions

PCT No. PCT/EP91/01391 Sec. 371 Date Dec. 14, 1992 Sec. 102(e) Date Dec. 14, 1992 PCT Filed Jul. 25, 1991 PCT Pub. No. WO92/02566 PCT Pub. Date Feb. 20, 1992.Aqueous polyurethane dispersions are prepared by reacting (a) dihydroxy compounds having a molecular weight of from 500 to 5,000, (b) diisocya...

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Hauptverfasser:	LOTHAR MAEMPEL, HERBERT FISCH
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES INKS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS USE OF MATERIALS AS ADHESIVES USE OF MATERIALS THEREFOR WOODSTAINS
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Zusammenfassung:	PCT No. PCT/EP91/01391 Sec. 371 Date Dec. 14, 1992 Sec. 102(e) Date Dec. 14, 1992 PCT Filed Jul. 25, 1991 PCT Pub. No. WO92/02566 PCT Pub. Date Feb. 20, 1992.Aqueous polyurethane dispersions are prepared by reacting (a) dihydroxy compounds having a molecular weight of from 500 to 5,000, (b) diisocyanates and, if required, (c) chain extenders having at least two hydrogen atoms which are reactive toward isocyanate groups and a molecular weight of less than 300 in the melt or in the presence of a water-miscible, inert organic solvent (S) which boils below 100 DEG C. to give a prepolymer having terminal isocyanate groups, then reacting the prepolymer with (d) salts of aliphatic aminocarboxylic or aminosulfonic acids or tertiary ammonium salts and dispersing the resulting polyurethane in water, by a process in which, before the polyurethane obtained is dispersed in water, from 5 to 60 parts by weight, based on 100 parts by weight of the polyurethane, of a polymer (p) [sic]which is dissolved in a solvent (S') boiling below 100 DEG C. is admixed, with the exception of condensates of phenol with formaldehyde and of epichlorohydrin with bisphenol A, and said polyurethane dispersions are used as adhesives or coating materials.