Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-08-17
2000-04-11
Merriam, Andrew E. C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524547, 526277, 26099817, 106 35, A61K 716, A61K 6083
Patent
active
060489138
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a dental coating composition, particularly a coating composition used for beautifying teeth.
BACKGROUND ART
Manicure and pedicure, as for cosmetic care of hands and fingernails and feet, are widely enjoyed by females. In recent years, cosmetic care of teeth has also become popular. This kind of dental care is generally carried out by applying a dye- or pigment-containing composition to teeth.
Use of a dental adhesive is one example of a technique for applying a composition to teeth. Specifically, a monomer or the like is applied to the teeth, followed by polymerization in a short time by ultraviolet irradiation or heating (ex. Japanese Patent Application Laid-Open No. SHO 53-69494 and Japanese Patent Application Laid-Open No. SHO 52-113089).
Considering the use, the above-described dental adhesive has a high adhesion strength such that it does not peel off from the teeth for a long period of time. For the purpose of dental beautification, on the other hand, the composition must have a proper adhesion strength such that it does not peel off easily during drinking or eating, but it can be removed easily if necessary. Since the above-described dental adhesive is polymerized in a short time using ultraviolet irradiation or the like, it impossible to control the adhesion strength or coating degree.
In addition, the above-described monomer involves a safety problem so it is often inappropriate to use the monomer for dental care at home.
An object of the present invention is therefore to provide a dental coating composition which does not peel off easily when drinking or eating, has a proper adhesion strength such that it can be removed easily if necessary and is highly safe in use.
DISCLOSURE OF THE INVENTION
In view of the forgoing circumstances, the present inventors have carried out an extensive investigation. As a result, it has been found that a dental coating composition comprising a polymer which has in its molecule a phosphorus series acid residue such as phosphoric acid and has a pre-determined weight-average molecular weight; and a specific solvent has an appropriate adhesion strength when applied to teeth, beautifies the teeth by imparting gloss or the like and is excellent in safety, leading to the completion of the invention.
In one aspect of the present invention, there is thus provided a dental coating composition comprising (a) a polymer which has in its molecule one or more phosphorus series acid residues selected from the group consisting of phosphoric acid, phosphonic acid and phosphinic acid, and halides and salts thereof and has a weight-average molecular weight of from 10,000 to 5,000,000; and (b) water or a C.sub.1-5 alcohol.
In another aspect of the present invention, there is also provided a dental coating process, which comprises applying the above dental coating composition to teeth.
In a further aspect of the present invention, there is also provided the use of the above-described polymer (a) for the dental coating.
BEST MODES FOR CARRYING OUT THE INVENTION
The polymer (a) usable in the present invention has, in its molecule, one or more phosphorus series acid residues selected from the group consisting of phosphoric acid, phosphonic acid and phosphinic acid, and halides and salts thereof and has a weight-average molecular weight of 10,000 to 5,000,000.
Examples of the phosphoric acid residue contained in the polymer (a) include phosphate and diphosphate groups, each having at least one hydroxyl group, such as a phosphoric acid residue (1), phosphoric acid monoester residue (2), diphosphoric acid residue, (3) diphosphoric acid monoester residue (4) and diphosphoric acid diester residue (8) (each of the bonds in the below-described formulas (1) to (10) is bound to an atom other than oxygen, preferably, a carbon, nitrogen or sulfur atom, more preferably a carbon atom). ##STR1##
Examples of the phosphonic acid residue include phosphonate or diphosphonate groups each having at least one hydroxyl group, such as a phosphonic acid re
REFERENCES:
patent: 4274933 (1981-06-01), Kamada et al.
patent: 4877936 (1989-10-01), Engelbrecht
patent: 5079277 (1992-01-01), Wilson et al.
patent: 5367002 (1994-11-01), Huang et al.
patent: 5461433 (1995-10-01), Nakabayashi et al.
patent: 5645429 (1997-07-01), Blackwell et al.
Kayane Shigeto
Nakano Yukihiro
Oshima Akira
Yamagishi Atsushi
Kao Corporation
Merriam Andrew E. C.
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