AQUEOUS POLYURETHANE DISPERSION

PURPOSE: An aqueous polyurethane dispersion is provided which gives coating materials which have excellent wet abrasion fastness and high wet and dry flexural durability. CONSTITUTION: An aqueous polyurethane dispersion comprises a) at least one polyol having number -average molecular weight of 500...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HASSEL TILLMANN DR, MUENZMAY THOMAS DR, MEIXNER JUERGEN DR, REINERS JUERGEN DR, SCHOOB JOERG
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G APPARATUS THEREFOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL CHEMICAL PAINT OR INK REMOVERS CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING,IMPREGNATING, FINISHING CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS FOR TANNING COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES GENERAL PROCESSES OF COMPOUNDING HIDES INKS LEATHER MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PELTS PERFORMING OPERATIONS POLISHES PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SKINS SPRAYING OR ATOMISING IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE: An aqueous polyurethane dispersion is provided which gives coating materials which have excellent wet abrasion fastness and high wet and dry flexural durability. CONSTITUTION: An aqueous polyurethane dispersion comprises a) at least one polyol having number -average molecular weight of 500 - 6000 g/mol, preferably 1000 - 4000 g/mol, more preferably 1500 - 3000 g/mol; b) at least one polyol, preferably diol having molecular weight of less than 500 g/mol, preferably 61 - 499 g/mol; c) at least one aliphatic polyisocyanate, preferably diisocyanate; d) at least one diol having molecular weight of less than 450 g/mol and containing at least one ionic group and/or potentially ionic group, preferably at least one carboxyl group or carboxyl acid salt group; e) at least one amine having 1 - 6 OH group and reactive to NCO group; f) water, and optionally g) primary alcohol, wherein the molar ratio of polyol a) to the sum of polyols b) and d) is 1: 1.5 - 1: 4, preferably 1: 2 - 1: 3, the molar ratio of the sum of polyols a), b) and d) to polyisocyanate c) is 1: 1.1 - 1: 2.5, preferably 1: 1.2 - 1: 1.7, the number of OH group of polyurethane is preferably 2 - 6, more preferably 2 - 4, and number-average molecular weight of polyurethane is less than 15000, preferably 2500 - 10000, particularly 3000 - 7000 g/mol.