Products based on plaster and processes for their manufacture

Details Products based on plaster and processes for their manufacture Products based on plaster and processes for their manufacture

1978-07-25

1980-09-02

Pertilla, Theodore E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106116, 260 15, 264176R, 264331, 525157, 528254, 528259, C08L 6128

Patent

active

042205760

ABSTRACT:
The process for the manufacture of a plaster product comprises adding a u-formol or melamine-formol resin to a calcium sulphate base powder, the starting powder being constituted by partially hydrated calcium sulphate (plaster alone or with gypsum, or anhydrite with gypsum such as phosphogypsum). The percentage of resin, measured in weight of dry extract of the latter with respect to the weight of the dry extract of the powder to which it is added, is comprised between 1 and 5%. A powder-resin-water mixture is formed by a process of extrusion. The product thus formed is heated to a temperature comprised between 105.degree. and 120.degree. C. Articles having exceptional surface hardness and durability can be formed therefrom by a continuous extrusion.

REFERENCES:
patent: 2966473 (1960-12-01), Biefeld et al.
patent: 3748290 (1973-07-01), Reingen
patent: 3852083 (1974-12-01), Yang

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