Aqueous multi-stage emulsion copolymer compositions for use in joinery applications

• Main Authors: Haase, Danniebelle, Wang, Wenqin, Gruver, Jocelyn, Bohling, James C, Hermes, Ann R
• Format: Patent
• Language: English
• Published: 29.01.2019
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED 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 aqueous compositions for use in coating wood joinery, especially for exterior use, comprising (a) one or more dihydrazide compounds in a total amount of from 0.5 to 4 wt. %, based on the total weight of composition solids and (b) of one or more aqueous multistage emulsion copolymers containing, as (i) a first stage, an emulsion copolymer having a glass transition temperature (Tg) via differential scanning calorimetry (DSC) of from −50 to 30° C., and containing, in copolymerized form one or more monoethylenically unsaturated phosphorous acid monomers and, one or more keto group containing amide monomers, and, as (ii) a second stage, an emulsion copolymer having a DSC Tg of at least 50° C. to 125° C., wherein the weight ratio of (i) the first stage to (ii) the second stage, based on copolymer solids, ranging from 50:50 to 90:10.