AQUEOUS POLYMER DISPERSIONS

• Main Authors: STRAUB, Hugues, CHOUDHERY, Riaz, Ahmad
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2013
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; 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 MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

A process for the manufacture of an aqueous polymer dispersion comprising the steps of i)providing a mixture of a first and second polymer each having a viscosity greater than 30 Pa·s at 100s−1 when measured at 100° C., the mixture comprising a) from 1 to 60 parts by weight of a first polymer immiscible in aqueous medium and optionally comprising reactive moieties and b) from 40 to 99 parts by weight of a second polymer comprising dispersing 10 groups, the polymer being miscible in the aqueous medium and optionally further comprising moieties reactive with the moieties on the first polymer ii) causing the polymers to melt at a chosen temperature under conditions of high shear in an extruder to form an intimate mixture of the polymers iii)optionally causing the reactive moieties of the first and second polymer to 1 react with each other under conditions of high shear in an extruder, to form a reacted mixture iv) quench cooling the molten mixture of step ii) or step iii) outside the extruder to form a solid pro