Plaster of paris using glyoxal treated hydroxyalkyl guar

Abstract From the Canadian patent

A blend comprising as the first component a product of a reaction of hydroxyalkyl ether of guar and glyoxal the reaction being carried out, at a pH of about 6.0 to 6.3 in a water-solvent media wherein the hydroxy-, alkyl group of the hydroxyalkyl ether of guar contains from 2 to 4 carbon atoms, and the amount of glyoxal reacted with the hydroxyalkyl ether of guar is about 0.01% to 1.5% by weight of the hydroxyalkyl ether of guar said reaction product being in an amount of about 0.2 to 3.0% by weight of the total blend; and, as a second component a non-guar cross linking gypsum cement.