Aqueous Compositions Comprising A Blend of Emulsion Vinyl Copolymer and Polyurethane Dispersion

• Main Authors: FU, ZHENWEN, HEJL, ANDREW, SWARTZ, ANDREW J, SHEPPARD, AURELIA DE LAS CUESTAS
• Format: Patent
• Language: English; French; German
• Published: 22.02.2012
• Subjects: 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; 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 THEREFOR; WOODSTAINS

The present invention provides compositions that enable excellent early hardness development in coating applications, the compositions comprising a blend of one or more copolymer, pA, having a Tg of 20°C or higher, and one or more polyurethane copolymer in aqueous dispersion, pB, together with one or more additive chosen from a coalescent having a normal boiling point of from 150°C to no greater than 300°C, a naturally derived plasticizer, and mixtures thereof. The polyurethane copolymer comprises at least 40 wt.%, based on the weight of polyurethane solids, of: (i) a first polyol having a molecular weight of at least 850, wherein the first polyol is a polyether polyol, or (ii) a second polyol chosen from a polyester, a polycaprolactam, a polycarbonate and a combination thereof, wherein the second polyol has a molecular weight of at least 1,500, or (iii) a combination of one or more first polyol and one or more second polyol. The compositions may be ambient curable.