US 2004/0175409 A1 · Temporary adhesive for metal-metal and metal-ceramic bonds

Abstract

The invention relates to a method for the production of an adhesive and an adhesive kit for joining similar or different metal surfaces or ceramics, especially in the field of biomedicine. The objective of the invention is to avoid polymerization-linked by-products and disadvantageous effects, in addition to enabling a temporary biocompatible bond between metal and metal or metal and ceramics. The inventive method consist in using a monomer-free polymethylmethacrylate which is mixed with a suitable, non-toxic solvent and a bioactive vitreous-crystalline material with a particle size ranging from 0.05-20μ, consisting of 15-45 wt. % CaO, 40-45 wt. % P2O5, 10-40 wt. % ZrO2 and 0.7-3.5 wt. % fluoride, having apatite and calcium zircon phosphate as main crystal phases and a glass phase as an auxiliary component until a flowable mixture is obtained. The invention also relates to an adhesive kit consisting of said components. Sufficient amounts of resistance are obtained for a temporary bond, enabling the bond to be neutralized when desired.

Claims17

Dependent claims

A method for the production of a temporary adhesive for metal-metal and metal-ceramic bonds comprising the steps of

mixing 15 to 50% by weight, relative to the total weight of the adhesive, of a monomer-free polymethylmethacrylate (PMMA) whose average molar mass ranges between 3,000 and 200,000 daltons and whose acid value ranges between 10 and 350 mg KOH per g polymer with a biocompatible, organic solvent or solvent mixture for the PMMA, and
adding 0.05 to 80% by weight, relative to the total weight of the adhesive, of a bioactive vitreous-crystalline material with a particle size ranging between 0.05 and 20 μm to the mixture, which material consists of 15-45% by weight CaO, 40-45% by weight P2O5, 10-40% by weight ZrO2 and 0.7-3.5% by weight fluoride, relative to the total weight of the vitreous-crystalline material, and comprises apatite and calcium zirconium phosphate as main crystal phases and a glass phase as an auxiliary component, said main crystal phases of the vitreous-crystalline material jointly making up at least 35% by weight and said auxiliary components making up 5 to 15% by weight,
while stirring and at a temperature ranging between 10 and 50° C. until a flowable mixture is obtained whose open processing time ranges between 1 an 20 minutes.

Dependencies are inferred from the claim text.

Temporary adhesive for metal-metal and metal-ceramic bonds

Life of this patent

Temporary adhesive for metal-metal and metal-ceramic bonds

Life of this patent

Abstract

Claims17