PREPARATION OF AQUEOUS DISPERSION OF COPOLYMER PARTICLES OF VINYL ACETATE AND CYCLIC KETENE ACETAL MONOMER

• Main Authors: ANDREW HEJL, RALPH C EVEN, MATTHEW CARTER
• Format: Patent
• Language: English; Japanese
• Published: 22.10.2020
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide a method of preparing aqueous-based VA-CKA copolymers for significantly reducing formation of unwanted hydrolytic byproducts.SOLUTION: The method comprises the steps of contacting, under emulsion polymerization conditions, vinyl acetate, a cyclic ketene acetal monomer, and a monoethylenically unsaturated acid monomer or a salt thereof, so as to form an aqueous dispersion of copolymer particles comprising structural units of the vinyl acetate, cyclic ketene acetal and monoethylenically unsaturated acid monomer or salt thereof.SELECTED DRAWING: None 【課題】水性ベースのＶＡ−ＣＫＡコポリマーを調製する方法であって、望ましくない加水分解副産物の形成を著しく減少させる方法を提供する。【解決手段】乳化重合条件下で酢酸ビニル、環状ケテンアセタールモノマー、およびモノエチレン性不飽和酸モノマーまたはその塩を接触させて、酢酸ビニル、環状ケテンアセタール、およびモノエチレン性不飽和酸モノマーまたはその塩の構造単位を含むコポリマー粒子の水性分散液を形成する工程、を含む方法。【選択図】なし