Method for retarding plaster setting and plaster preparation

Details Method for retarding plaster setting and plaster preparation Method for retarding plaster setting and plaster preparation

2005-08-12

2008-11-25

Green, Anthony J (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

C106S287260, C106S784000, C106S810000, C106S823000

Reexamination Certificate

active

07455728

ABSTRACT:
A method for retarding plaster setting and plaster preparations, relies upon a composition including a. tartaric acid in an amount of at least 0.01 to 1.0 weight % (based on plaster amount); b. sodium trimetaphosphate in an amount of 0.05 to 0.5 weight %, (plaster amount basis); and optionally c. sodium polyphosphate with an average chain length of at least 4 to 50 phosphate units.

REFERENCES:
patent: 3770468 (1973-11-01), Knauf et al.
patent: 5746822 (1998-05-01), Espinoza et al.
patent: 6342284 (2002-01-01), Yu et al.
patent: 6398864 (2002-06-01), Przybysz et al.

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