Acrylic copolymer

Details Acrylic copolymer Acrylic copolymer

1991-05-31

1993-09-07

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

523118, 526240, 526287, C08F21214, C08F22012

Patent

active

052430065

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a novel acrylic copolymer, a process for the preparation of the acrylic copolymer and the use/application of the acrylic copolymer, and particularly to an adhesive composition containing the copolymer. In more detail, the invention relates to a novel acrylic copolymer having an excellent affinity for hydroxyapatite structures and having a high solubility or a high dispersibility in solvents, a process for the preparation of the acrylic copolymer and an adhesive composition containing the acrylic copolymer.


BACKGROUND OF THE INVENTION

For repairing or remedying hydroxyapatite structures such as dentin, (meth)acrylic resins for biochemical art (i.e., acrylic resins) having radical polymerizability have been conventionally employed. In such use application, it is required that an adhesive strength between the acrylic resins and the hydroxyapatite structures hardly varies for a very long period of time and the adhesive strength therebetween is high. Therefore, in the case of remedying dentin by the use of a remedying acrylic resin containing a methacrylic resin as an adhesive component, there has been employed a method comprising treating the beforehand-abraded (or beforehand-shaved) surface of the dentin with an etching agent such as an acid to remove shavings and to roughen the surface, then coating the surface with an adhesive containing a similar component to that of the remedying acrylic resin, then curing the coated adhesive, and coating the cured adhesive with the remedying acrylic resin.
However, the etching agent used in the roughening treatment, such as an acid, sometimes permeates inside of the aimed object to damage the hydroxyapatite structure, because the etching agent is a low-molecular compound. Further, if the hydroxyapatite structure is dentin, the etching agent permeates the structure to stimulate a nerve, and therefore the patient sometimes suffer an acute pain in the remedy.
In the conventional remedy for such parts, a cement prepared by combining a polyacrylic acid with zinc oxide or an aluminosilicate glass is applied on a surface of the hydroxyapatite structure and then the acrylic resin is applied thereon, to mitigate the stimulation in the adhering stage. However, such cement inherently has low adhesion properties, so that it is impossible to make a sufficient remedy by the use of the cement.
For the above-mentioned reason, the present inventors have proposed to employ a polymer-type surface-treating agent comprising an acidic group-containing polymer, in order to reduce a damage of the hydroxyapatite structure and to prevent the etching agent from permeation inside of the aimed object. (see: Japanese Patent Application No. 60(1985)-171024)
The acrylic copolymer described in this specification has a sulfonic acid group. Concretely, a copolymer of a methacrylic ester (e.g., methyl methacrylate) and a monomer containing a sulfonic acid group (e.g., a p-styrene sulfonic acid) is dissolved in a solvent such as water or ethanol, then the resulting solution is applied on a surface of the hydroxyapatite structure, and thus coated structure is washed with water. By the adaptation of this method, the surface treatment of the hydroxyapatite structure can be done with restraining invasion of the etching agent into the hydroxyapatite structure. Further, on the surface of the hydroxyapatite structure is formed a layer which is adsorbed with a copolymer used in this treatment. The copolymer layer firmly adheres to the hydroxyapatite structure, because the sulfonic acid group of the copolymer is bonded to the calcium component contained in the hydroxyapatite structure. Moreover, the copolymer layer has an excellent affinity for the adhesive acrylic resin (or remedying acrylic resin) which is to be applied on the layer, because the copolymer of the layer contains recurring units derived from methyl methacrylate Accordingly, in the case of using the acrylic copolymer, the hydroxyapatite structure and a filler are united with each other via th

REFERENCES:
patent: 3033833 (1962-05-01), Le Fevre
patent: 4373056 (1983-02-01), Besecke
patent: 4870120 (1989-09-01), Tsubakimoto

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