Method of preparing a gypsum-based product
AssigneeSaint-Gobain Placo
InventorsKirsty Walton, Nicholas Jones, David Cutler, Nicola Jupp, Laura Brooks
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Abstract
A method of preparing a gypsum-based product comprises the steps of mixing calcined gypsum with polymer particles and water to provide a slurry. The polymer particles comprise principally polyvinyl acetate, and have a particle size distribution, measured using laser diffractometry, such that particles having a diameter of 4.5 μm or less provide at least 90% of the total particle volume.
Claims12
A method of preparing a gypsum-based product, comprising the steps of mixing calcined gypsum with polymer particles and water to provide a slurry, the polymer particles comprising principally polyvinyl acetate, wherein
- the polymer particles have a particle size distribution, measured using laser diffractometry, such that particles having a diameter of 4.5 μm or less provide at least 90% of the total particle volume,
- wherein the polymer particles are present in the slurry in an amount of 15 wt % or less relative to the calcined gypsum, and
- wherein the particles additionally comprise polyvinyl alcohol and the polyvinyl alcohol phase is present as a surface layer extending partially or wholly around the exterior of the particle.
Dependencies are inferred from the claim text.