Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1976-03-17
1978-05-16
Turer, Richard B.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
96115P, 20415916, 20415918, 20415924, 260 4215, 260 4218, 260 4222, 260 4253, 260 775CR, 260859R, 26099811, C08F 246, C08F 400
Patent
active
040897630
ABSTRACT:
A method of repairing teeth which comprises applying to the teeth a composition comprising (a) an inert, translucent, inorganic particulate filler (b) a polymerizable material comprising a polymerizable prepolymer containing at least two polymerizable ethylenically unsaturated groups and being the reaction product of a urethane prepolymer and a polymerizable ethylenically unsaturated monomer reactive with the urethane prepolymer; the urethane prepolymer being the reaction product of a diisocyanate and a diol; up to 100% by weight of the polymerizable prepolymer of a liquid ethylenically unsaturated monomer which is copolymerizable with the polymerizable prepolymer; and from 0.01 to 10% by weight of the polymerizable material of a photosensitive catalyst capable of curing the composition on exposure to visible light and comprising a photosensitizer selected from fluorenone and an .alpha.-diketone of the formula A.CO.CO.A, wherein the groups A are aliphatic, aromatic, cycloaliphatic, aralkyl or alkaryl, or together form a divalent aliphatic or aromatic group which together with the carbonyl groups forms a cyclic structure, and a reducing agent capable of reducing the photosensitizer when the photosensitizer is in an excited state, and curing the composition by irradiating the composition with visible radiation in the range 400 m.mu. to 500 m.mu..
REFERENCES:
patent: 3625744 (1971-12-01), Juna et al.
patent: 3709866 (1973-01-01), Waller
patent: 3759807 (1973-09-01), Osborn et al.
patent: 3772404 (1975-11-01), Knight et al.
patent: 3840448 (1974-10-01), Osborn et al.
patent: 3876518 (1975-04-01), Borden et al.
patent: 3878077 (1975-04-01), Borden et al.
Cantwell John Burnett
Dart Edward Charles
Jaworzyn Joseph Franciszek
Nemeck Jozef
Traynor James Rodney
Imperial Chemical Industries Limited
Turer Richard B.
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