JPH08291015A - Adhesive for dental prosthesis and its preparation - Google Patents

Abstract

PURPOSE: To obtain an adhesive for artificial denture excellently adhering and effective for long time. CONSTITUTION: The pasty base of this adhesive capable of packing into a tube, is produced by, mixing sorbitol with carboxymethyl-cellulose, curing the obtained mixture, grinding the mixture into powder, preparing an alcoholic solution consisting of ester gum or polyvinylacetate, the previously prepared powder is put into the heated solution and mixed to afford a viscous intermediate, the intermediate is heated under stirring to cure and ground to obtain the powder, the powder is mixed with distilled water to afford the final product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive comprising a paste-like base material containing carboxymethyl cellulose and a method for producing the adhesive.

[0002]

2. Description of the Related Art In order to meet the high requirements for the adhesive ability of such adhesives, most adhesives contain carboxymethylcellulose as a main component. After being washed off from the drug substance, this washout of carboxymethylcelluloses causes a rapid loss of adhesive strength again. In order to prevent this washout, it has already been attempted to bond carboxymethylcelluloses to the other components of the adhesive matrix, and the known bonding to polyvinyl acetate (EP-A-0229010) has been successful. However, the bond period is still unsatisfactory. Even if carboxymethylcellulose is bound to oily substances such as vaseline, paraffin oil, polyvinylpyrrolidone, etc.,
The desired result was not obtained and the carboxymethylcellulose washout was not prevented.

[0003]

SUMMARY OF THE INVENTION The problem underlying the invention is therefore to provide an adhesive which is excellent in adhesiveness and guarantees the best possible reliable adhesion to the denture over a long period of time. Is. The present invention further presents an economical method for producing this adhesive.

[0004]

In order to solve this problem, according to the present invention, carboxymethylcellulose of the adhesive base is bonded to sorbit. Sorbit is a colorless, odorless, slightly sweet, transparent, and hexavalent alcohol belonging to hexitol, which is chemically bonded to carboxymethyl cellulose to form a curable substrate, which is a solid solid product after a long curing time. Carboxymethylcellulose is no longer washed off or separated from the sorbit from the solid product. Therefore, the combination of carboxymethylcellulose and sorbit enables the production of adhesives which remain practically invariant of high adhesive capacity because there is almost no washout of carboxymethylcellulose even after prolonged use.

In order to produce such adhesives economically, according to the invention, the sorbit is first mixed with carboxymethylcellulose and the resulting mixture is hardened and ground to give a powder of ester gum or poly. A solution consisting of vinyl acetate and ethyl alcohol is prepared and the pre-made powder is mixed into the heated solution to give a sticky intermediate product, which is preferably the first mixture with heating and stirring. The product is hardened and ground into a powder, which is subsequently mixed with distilled water into a pasty mass that can be filled into a tube as the final product. At that time, 68 sorbit of 100 weight unit is used.
By mixing into a weight unit of carboxymethylcellulose, and then 68 weight units of a premade powder into a solution of ester gum or polyvinyl acetate and 85% ethyl alcohol heated to at least 60 ° C. An intermediate product is prepared, followed by mixing 100 parts by weight of the intermediate product with 25 parts by weight of water.

[0006]

EXAMPLE As a prerequisite for the production of adhesives, sorbit is mixed with carboxymethylcellulose and a solid green mass is formed after a curing time of at least 3 hours, which is finely divided by a grinder, for example a mill. It is crushed into a fine powder. Independently of this powder production, in a second preparatory step, the ester gum is dissolved in 85% ethyl alcohol, which results in a sticky green body as a solution. The ester gum, which is also used as the basis for the chewing gum composition, is a colorless thermoplastic resin, namely the glycerol ester of pine resin (colophony), which is produced in a special process, resulting in a product with low odor and low acid content. Occurs. Polyvinyl acetate can also be used instead of ester gum. The pre-made powder is put into this solution, which is preferably heated to about 60 ° C., and mixed by a suitable stirrer, preferably a vacuum stirrer, for a mixing time of at least 20 minutes, so that a strongly sticky substrate is formed intermediately. It is obtained as a thing. Although this intermediate product has such a strong adhesion capacity that it can practically hardly be used as the final product, it can be further processed, for example for impregnating fibrous webs as adhesive fillers for dentures.

In order to produce an adhesive which can be filled into the tube, a further process step is necessary in order to obtain the desired end product from this intermediate product. Therefore, the intermediate product is stirred at an elevated temperature of about 60 ° C. in an open container until all of the intermediate product alcohol has escaped. This causes the intermediate product to harden and again form a hard green mass, which is ground again to a powder. The powder is then mixed with distilled water in a vacuum stirrer, requiring a long mixing time of 3 hours or more and high temperature to allow the carboxymethyl celluloses bound to the sorbite to mainly accept some water. is there. Finally, mixing 4 parts of the intermediate product with about 1 part of distilled water gives a paste which can be easily applied and filled into the tube as the final product. This paste is best suited as an adhesive for dentures, which is particularly effective for long periods of time and has the desired excellent adhesion.

Claims (3)

[Claims] 1. An adhesive for dentures, characterized in that carboxymethylcellulose, which is an adhesive consisting of a paste-like base material containing carboxymethylcellulose, is bonded to sorbit. 2. First, sorbit is mixed with carboxymethyl cellulose, and the resulting mixture is hardened and ground into powder to prepare ester gum or a solution of polyvinyl acetate and ethyl alcohol, which is prepared in advance. The above powder was mixed into the above heated solution to give a sticky intermediate product, which was then hardened and ground into a powder, which was subsequently mixed with distilled water. The method for producing an adhesive according to claim 1, wherein the final product is a paste-like base material that can be filled into a tube. 3. 100 parts by weight of sorbit are mixed with 68 parts by weight of carboxymethylcellulose, and then 68 parts by weight of a pre-made powder consist of ester gum or polyvinyl acetate and 85% ethyl alcohol. An intermediate product is prepared by mixing with a solution heated to at least 60 ° C., followed by 100 parts by weight of the intermediate product.
3. Mixing with 5 weight units of water.
The method described in.