Patent ID: 7223808

Claim:
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 comprises 15–45% by weight CaO, 40–45% by weight P 2 O 5 , 10–40% by weight ZrO 2 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 dine ranges between 1 and 20 minutes.