Gypsum plaster

Details Gypsum plaster Gypsum plaster

1978-12-14

1980-09-30

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

106314, C04B 1114

Patent

active

042253616

ABSTRACT:
Gypsum and anhydrite plaster is improved by adding at least one alkylene diphosphonic acid or water soluble salt thereof, represented by the following formula: ##STR1## wherein X is hydrogen or lower alkyl of 1-4 carbons, Y is hydrogen, hydroxy or lower alkyl of 1-4 carbons, and n is 1-10. The plaster is found to have an increased finishing time, while the quantity of water necessary is reduced and the mechanical strength of the finished plaster is improved.

REFERENCES:
patent: 3346487 (1967-10-01), Iriani et al.
patent: 3346488 (1967-10-01), Lyons et al.
patent: 3941772 (1976-03-01), Ploger et al.
patent: 4034086 (1977-07-01), Ploger et al.

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