Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-08-20
1995-05-23
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523118, 523120, 524595, 524596, 525132, 525502, 4332281, A61K 608, C08L 6104
Patent
active
054182620
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an adhesive, waterproof hydrolysis-resistant bonding layer for metal, ceramic, glass, and polymer-plastic bonds and a dispersion for producing it. The bonding layer of the invention is preferably used for bonds which are exposed to steady mechanical and temperature-change stresses, along with simultaneous moisture action, in this case for bonds in dental technology in particular.
Numerous suggestions for bonding plastics with metal surfaces in a gapless manner have been made in the past years. The basic principle of these processes is that in a first step an inorganic (mostly silicate) layer is applied to a metal surface (silicate treatment) and that in a second step the surface is coated with a functional alkoxysilane (silane treatment). In this case the adhesive silane (mostly hydrolized .gamma.-methacryloyloxypropyltrimethoxysilane) constitutes the bond between the inorganic silicate layer and a methacrylate-containing plastic dental material, wherein on the one hand the free OH groups of the adhesive silane, with the surface OH groups of the silicate layer, are chemically bonded to the silicate layer in the course of condensation reactions while, on the other hand, there is bonding to a plastic dental material for example, via the methacrylate group of the adhesive silane. The known processes are distinguished by the methods of the different application of the silicate layer, while the application of the adhesive silane is almost identical in all described processes.
U.S. Pat. No. 4,364,731 describes a process for applying a silicon dioxide layer to metallic denture parts for a high-frequency magnetron sputtering device. Since a vacuum coating installation is required for this, the process requires a considerable outlay for apparatus.
In DE-PS 34 03 894 the application of the silicate layer takes place by means of a clearly more simple flame-hydrolysis process of the tetraethoxysilane whereby, however, good adhesion of the plastic to the metal is only attained when the apparatus parameters are strictly adhered to.
Furthermore, a process is described in DD 276 453 in which a silicate-chromium oxide layer is applied to a dental alloy surface by means of a sol-gel solution and is fixed by means of a subsequent tempering process (320.degree. C., 2 to 8 min). Dental alloys with an increased copper content (>5% of mass) in particular reveal themselves as being critical, because in this case copper(II)-oxide, which does not adhere well to the alloy surface, is formed by the tempering process, because of which the metal-plastic bond is weakened.
A method is described in DE-PS 38 02 043 in which the silicate layer is applied in a sand-blasting process by adding a defined amount of silicon dioxide of a mean particle size .ltoreq.5 .mu.m to the abrasive corundum. In the course of this, local energy densities appear in the impact area of the corundum particles, which are sufficient to fuse the fine silicate particles to the metallic surface. With this process, too, sufficient bonding adhesion can only be achieved with the most scrupulous adherence to the operating parameters.
The known described processes all require an expensive outlay in apparatus or chemicals and several process steps. In addition, when used in the dental field, the Si-O-Si bonds of the silicate layer are subjected to continuous hydrolysis attack because of the constant exposure of the plastic-metal bonds to moisture in the mouth area, which can result in a weakening of the bond adhesion during prolonged exposure.
Thus it is the object of the invention to recite an adhesive, waterproof and hydrolysis-resistant layer which can be produced with little outlay in apparatus and which is suitable for bonding plastics, in particular methacrylate-containing plastic dental materials or adhesives, in a durable manner with a high degree of adhesiveness and free of edge gaps to metal, glass, ceramic or organic surfaces.
The object of the invention is attained by the means recited in the characterizing parts of the claims.
A disp
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patent: 4407984 (1983-10-01), Ratcliffe et al.
patent: 4600390 (1986-07-01), Gobel
patent: 5049190 (1991-09-01), Gobel
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List per MPEP 608.01(v) of dental alloys and dental resin materials identified in specification by respective trademarks.
Heraeus Edelmetalle GmbH brochure about High Gold Content Casting Alloys pp. 7-9.
Degusssa AG brochure about "Degulor M" pp. 4-11.
Wieland Edelmetalle GmbH & Co. brochure about Auropal 2 (Aug. '93).
Wieland Edelmetalle GmbH & Co. brochures about Duo Pal 6 and Simidur S2 (Aug. '93)
Heraeus Kulzer GmbH brochure about Estilux pp. 5-20 (Jul. '86).
Heraeus Kulzer GmbH brochure about Charisma (Apr. '93).
Heraeus Kulzer GmbH brochure about Palavit 55.
Kulzer & Co. GmbH brochure about Dentacolor pp. 1-2 (Apr. '74).
Kulzer & Co. GmbH brochure about Dentacolor pp. 1-6 (Nov. '84).
Heraeus Kulzer GmbH
Michl Paul R.
Yoon Tae H.
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