Patent ID: 6277910
Filing Date: 2001-08-21
Classification: C09D

Abstract:
A storage stable water-borne hybrid binder composition obtained by the process comprising mixing about 20-80% by weight of A) an aqueous dispersion of a polymer prepared from one or more monomers from at least one of the groups:i) a carboxyl functional monomer selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid and fumaric acid;ii) a hydroxyl functional monomer selected from the group consisting of 2-hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, allyl alcohol and methallyl alcohol;iii) an epoxy functional monomer comprising glycidyl methacrylate;iv) an amino functional monomer selected from the group consisting of acrylamide, methacrylamide and ethyl imidazolidon metharylate;v) an alkyl acrylate or an alkyl methacrylate selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, stearyl methacrylate, isobornyl acrylate and isobornyl methacrylate;vi) a polymerizable aromatic monomer selected from the group consisting of styrene, .alpha.-methyl styrene, vinyl toluene, t-butyl styrene and diallyl phthalate;vii) an .alpha.-olefin selected from the group consisting of ethylene and propylene;viii) a vinyl monomer selected from the group consisting of vinyl acetate, vinyl propionate, vinyl versatate and dibutyl maleate; andix) a diene monomer selected from the group consisting of butadiene and isoprene;said dispersion having a dry-solids content of at least 45% by weight and containing at least 0.1% by weight of B) a single surfactant or a mixture of two or more different surfactants and protective colloids from at least one of the groups:i) an ethoxylated nonionic surfactant selected from the group consisting of alkylphenol ethoxylate and alcohol ethoxylate having different degrees of ethoxylation and similar compounds;ii) a nonionic sugar-based surfactant comprising a nonethoxylated surfactant prepared with glycose as polar part;iii) an anionic surfactant selected from the group consisting of alkyl sulphate, alkyl ether sulphate, alkyl phenol ether sulphate, dialkyl sulfosuccinate, hemisulfosuccinate, alkyl phosphate, alkyl ether phosphate, alkyl phenol phosphate and alkyl phenol ether phosphate; andiv) a protective colloid selected from the group consisting of a cellulose derivative and polyvinyl alcohol;and about 80-20% by weight of C) a resin being emulsifiable in water and having a dry-solids content above 90% by weight, and comprising one or more resins from at least one of the groups;i) a polyesterii) an alkyd resiniii) an epoxy resin or epoxy esteriv) a polyurethanev) a polyethervi) a fatty acid, an epoxidized fatty acid or an ester of one of thesevii) a blocked di- or polyisocyanateviii) an amino resin comprising a melamine-formaldehyde resin or urea-formaldehyde resin, andix) an acryl or vinyl resin;by adding the resin C to the dispersion A under agitation, the resulting hybrid binder composition obtaining a dry-solids content of 60-95% by weight, and a viscosity of max. 100 Pa.s, at room temperature.