Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1981-02-19
1983-03-15
Kimlin, Edward C.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
252 792, 252 793, 252136, 252142, 156663, 156 94, 156293, 433228, 433229, 433216, 433218, B44C 122, A61C 1300
Patent
active
043766730
ABSTRACT:
The method of etching a porcelain dental appliance insitu including the steps of contacting the porcelain with a buffered solution containing trace amounts of hydrogen fluoride and removing the solution after sufficient time has elapsed to etch the porcelain. Preferred solutions are buffered at a pH from about 2.0 to about 6.0 and most preferably from about 3.5 to about 4.5. Contact time of the solution with porcelain ranges from about five minutes to from about five to about thirty minutes or longer.
The solution preferably contains an alkali metal fluoride dissolved in a weak acid. In a preferred embodiment, the solution contains about one to about three parts by weight of sodium fluoride dissolved in about 50 parts to about 150 parts by weight of dilute weak acid. The weak acid has a molarity of from about 0.05 molar to about 0.5 molar. The weak acid solution is buffered, if necessary, and has a pH of from about 2.0 to about 6.0 and preferably from about 3.5 to about 4.5 A gelling agent may be added to gel the solution to permit more effective contact of the solution against with the porcelain being treated.
REFERENCES:
patent: 3847688 (1974-11-01), Gillice
patent: 3899437 (1975-08-01), Regan et al.
patent: 4117595 (1978-10-01), Ibsen et al.
Kimlin Edward C.
Munday John S.
Pennwalt Corporation
Wine F. K.
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