Title: Coating for gold or gold alloy castings for dental bridges and crowns

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Claims: What is claimed:

1. A powder-liquid system consisting of two separate components which are mixed for preparing dispersions useful for coating gold and gold alloy castings for dental bridges and crowns the first component consisting of a gold powder having an average particle size of from 5 to 16 .mu.m and, as the second component, a liquid vehicle suitable for dispersing said gold powder consisting of a solution of an alkali metal or alkaline earth metal borate salt and a stannous tin salt in an organic solvent selected from the group consisting of glycerine, ethylene glycol and propylene glycol.

2. The system of claim 1 wherein said borate salt is dilithium tetraborate and said organic solvent is a glycol.

3. The system of claim 2 wherein said tin salt is stannous chloride.

4. The system of claim 3 wherein said glycol is propylene glycol.

5. A system according to claim 2 wherein said liquid vehicle includes from 5 to 15% by weight of dilithium tetraborate.

6. A system according to claim 3 wherein said liquid vehicle includes from about 0.004 to about 0.020% by weight of stannous chloride.

7. A system according to claim 1 wherein said liquid vehicle has a viscosity of from 150 to 250 cps at 25.degree. C.

8. A dispersion useful for coating gold and gold alloy castings for dental bridges and crowns consisting of gold powder having an average particle size of from 5 to 16 .mu.m dispersed in a liquid vehicle consisting of a solution of an alkali metal or alkaline earth metal borate salt and a stannous tin salt in an organic solvent selected from the group consisting of glycerine, ethylene glycol and propylene glycol.

9. The dispersion of claim 8 wherein the volume/volume ratio of gold powder to liquid vehicle is from 0.5/1 to 1.5/1 said borate salt is dilithium tetraborate and said organic solvent is a glycol.

10. A dispersion according to claim 8 wherein said gold powder comprises from 70% to 86% by weight of said dispersion.

Other info:

Inventors: Subelka, John C. (Plainsboro, NJ, US)

Application Number: 870390
Filing Date: 1978-01-18
Publication_date: 1979-07-24
Assignee: Johnson & Johnson (New Brunswick, NJ)
Primary Class(es): 106/1.13 106/1.18, 106/35, 252/514
Other Classes:
US Patent Ref:

3073270	Jan, 1963	Johnson et al.	148/24.
3832242	Aug, 1974	Cuthbert	148/24.
4010048	Mar, 1977	Tesk et al.	148/24.

Other Refs:
Primary Examiner: Hayes, Lorenzo B.
Assistant Examiner:
Attorney: