Drug – bio-affecting and body treating compositions – Manicure or pedicure compositions
Patent
1993-03-18
1994-07-19
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Manicure or pedicure compositions
424401, 424682, 424693, 5147723, A61K 704
Patent
active
053307500
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to nail lacquer compositions and in particular to nail lacquers containing at least one fibrous additive.
Organic fibres such as nylon and silk have been incorporated into nail varnishes and associated products for a number of years. Nail varnishes containing such fibres are claimed to have improved properties including increased wear and protection against nail splitting, cracking, peeling and breaking. However, nylon and silk fibres have also been associated with certain disadvantages in nail varnish systems because they are soft and flexible and because the adhesion between the fibres and the nail varnish resin is low.
Surprisingly, the applicants have now found that the use of certain inorganic fibres in nail lacquers provides compositions having superior properties.
Accordingly, the present invention provides a nail lacquer composition which comprises 0.05 to 10%, preferably 0.05 to 5%, by weight of crystalline inorganic fibres having an aspect ratio of at least 2:1, preferably of at least 4:1, wherein said fibres are calcium silicate fibres or calcium sulphate fibres.
The term "nail lacquer" as used herein includes nail varnishes, top coats, base coats, nail hardeners and ridge fillers. Nail varnishes commonly contain colour pigments and pearlisers to produce an attractive cosmetic finish. In contrast, top coats are usually clear lacquers which may have a lower resin content and relatively high diluent content compared to nail varnishes. They are intended to give a fast drying, hardened, high gloss finish. Preferred nail varnish and top coat compositions according to the invention comprise 0.05 to 5%, preferably 0.05 to 2.5%, most preferably 0.1 to 1% by weight of inorganic fibres.
Base coats, nail hardeners and ridge fillers may be clear or pigmented nail lacquer compositions. They may contain higher levels of resin than nail varnishes to provide a smooth even base film with good adhesion to the nail surface and they may also contain agents which improve the properties of the nails themselves. Preferred base coats, nail hardeners and ridge fillers according to the invention comprise 0.05 to 10%, preferably 0.1 to 10%, most preferably 0.5 to 5% by weight of inorganic fibres.
The use of fibres in nail lacquers enhances matrix formation, improving the strength and wear of the lacquer film. Fibres may also act as terminators during crack formation thereby reducing the susceptibility of the dried lacquer to chipping. The inorganic fibres of use in the present invention achieve these advantages without significantly affecting the viscosity, rheology or gloss of the nail lacquer compositions.
Surprisingly, the applicants have found that the use of inorganic fibres in nail lacquers is not associated with many of the disadvantages associated with the known use of silk or nylon fibres. The crystalline inorganic fibres produce a hard, rough film which provides keying sites, ensuring good adhesion between the fibres, resin and nail surface, and enhances the wear of the nail lacquer. Furthermore, inorganic fibres do not substantially reduce the flexibility or increase the brittleness of the dried lacquer films.
The crystalline inorganic fibres of use in the present invention are substantially insoluble in typical solvents used in nail lacquer compositions. Suitable fibres are also resistant to attack by the dilute mineral or organic acids used to produce the suspending matrix of nail lacquer compositions. The use of calcium silicate or calcium sulphate fibres is preferred. Calcium metasilicate crystal fibres are found in a natural mineral source, wollastonite, commercially available from Croxton +Garry Ltd, UK under the trade name Kemolit Wollastonite. The aspect ratio of Kemolit Wollastonite is between 10:1 and 20:1. However, the use of single crystal whisker fibres of calcium sulphate is particularly preferred. Calcium sulphate whisker fibres may be derived by hydrothermal synthesis from the natural mineral source gypsum and are commercially available in the anhydrous or hemihydra
REFERENCES:
patent: 4646765 (1987-03-01), Cooper et al.
patent: 4873077 (1989-10-01), Thompson et al.
Data Sheet Jun. 1988 Croxton and Garry.
Fisher Julia E.
Sheard Christine
Page Thurman K.
The Boots Company PLC.
Venkat Jyothsna
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