Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-01-09
1977-09-06
Lieberman, Allan
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
32 2, 32 8, 32 12, 32 15, 260 324, 260 338UA, 260DIG36, C08J 502, C08J 510, C08J 532, C08J 3312
Patent
active
040467325
ABSTRACT:
Dispersants for the application of both a ceramic opaque underlay to a substrate and gingival and incisal porcelains thereover and methods for fabricating dental prostheses therewith in which the first dispersant consists essentially of methyl methacrylate polymer, methyl methacrylate monomer, ethyl acetate, trichloroethane and nitroethane in selected relative proportions which form an easily applicable dispersion with dental ceramic opaque for application to dental prosthetic substrates, the dispersion rapidly setting under relatively low temperatures to produce a mechanically strong, substantially water insoluble opaque mask compatible with but insoluable in aqueous-based gingival and incisal dental porcelains applied thereover to fabricate the finished surface of a dental prosthesis; and in which the second dispersant for the gingival and incisal porcelain consists essentially of an aqueous solution of a styrene, butyl acrylate-acrylic acid terpolymer neutralized with ammonia and a styrene-methyl methacrylate methacrylic acid terpolymer neutralized with ammonia; the dispersion rapidly setting under relatively low temperatures of an infra red lamp such that it can be ground or that touch-up porcelain may be applied without damaging the first application.
REFERENCES:
patent: 2013295 (1935-09-01), Tidd
patent: 2347567 (1944-04-01), Kresse
patent: 2558139 (1951-06-01), Knock et al.
patent: 2980998 (1961-04-01), Coleman et al.
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