Calcium sulphate-based products having enhanced water resistance
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United States of America Patent
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Sep 8, 2015
Grant Date -
Oct 17, 2013
app pub date -
May 24, 2010
filing date -
May 22, 2009
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Abstract
A water-resistant calcium sulphate based body comprises a matrix of crystalline calcium sulphate anhydrite, crystals of the matrix being connected to one another by water-resistant phosphate bonding zones, optionally also containing aluminum. The body can be produced by impregnating a porous calcium sulphate with a source of phosphate ions (optionally containing aluminum), and then calcining. Alternatively, a paste comprising calcium sulphate and a source of phosphate ions (optionally containing aluminum) is heated or compressed to form a ‘green body’ and then calcined to produce the body.
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