Patent DE-10219687-A1 (DE)
Title: Aqueous polyurethane dispersions from diisocyanates, diols, and other monomers useful as coatings for metals, plastics, paper, textiles, leather, and wood
Inventor: LICHT ULRIKE
IPC: C08G18/08
Filed: 2002-05-02
Abstract: Aqueous polyurethane dispersions from diisocyanates (a), diols (b), other monomers, other multivalent compounds and monovalent compounds different from (a) and (b) with a reactive group, e.g. an alcoholic OH group, an epoxide group containing polymerisate based on epoxide group containing (meth)acrylate, a nonfunctional acrylic or methacrylic acid ester, and ethylenically unsaturated compounds are new.  Aqueous dispersions containing polyurethane (I) synthesized from: (a) diisocyantes, (b) diols, of which (b1) contain 10-100 mole% on the total weight of diol (b), have a molecular weight of 500-5000 and (b2) contain 0-90 mole% of diol (b), and have a molecular weight of 60-500 g/mole, (c) monomers different from monomers (a) and (b) with at least one isocyanate group or at least one group reactive to isocyanates and at least one hydrophilic group or potentially hydrophilic group, which gives the polyurethane water dispersibility, (d) optionally other multivalent compounds different from monomers (a) and (b) and having reactive groups, i.e. alcoholic OH groups, primary and secondary amine groups, or isocyanate groups, and (e) optionally monovalent compounds different from (a) and (b) with a reactive group, e.g. an alcoholic OH group, a primary and secondary amine group, or an isocyanate group, and an epoxide group containing polymerisate (II) based on epoxide group containing (meth)acrylate (f) and optionally a nonfunctional ester of acrylic or methacrylic acid as a further monomer (g) and optionally ethylenically unsaturated compounds polymerisable with monomers (f) and (g) as additional monomers (h). Independent claims are included for: (1) a process for preparation of the aqueous dispersions containing polyurethane (I) synthesized from (a) diisocyanates, (b) diols, of which (b1) 10-100 wt. wt% of diols (b) of molecular weight 500-5000 and (b2) 0-90 wt.%m of diols (b) of molecular weight 60-500 g.mole, (c) from monomers different from (a) and (b) with one isocyanate group or one group reactive to isocyanates, carrying at least one hydrophilic group or at least one potentially hydrophilic group, which gives the polyurethane water dispersibility, (d) optionally multivalent compounds with reactive groups, different from (a) and (b), e.g. alcoholic OH groups, primary or secondary amine or isocyanate groups, and (e) optionally monovalent compounds as described above, and an epoxide containing polymerisate (II) as described above. The polyurethane (I) and polymerisate (II) are first separated, with reaction of monomers a,b, and c, and optionally g and h, with final dispersion of polyurethane (I) and polyme risate (II) in water at 1-0000degreesC;  (2) a process for coating metal, plastics, paper, textile, leather, or wood articles by application of a film of the dispersion to the article and drying;  (3) a process for adhesive bonding of metal, plastics, paper, textile, leather, or wood articles by application of a film of the dispersion to one of these articles and joining to another article after drying of the film;  (4) impregnation of the above articles by immersion in the dispersion and drying;  (5) an article coated, adhesive bonded, or impregnated with the dispersion;  (6) dispersion mixtures containing the dispersions with reactive epoxide groups.