Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-11-16
2003-12-02
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S061000
Reexamination Certificate
active
06656483
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to cosmetic compositions. More particularly, the present invention relates to cosmetic compositions with film-forming agents for application to the skin and nails.
2. Description of the Prior Art
Desirable cosmetic characteristics of film-forming cosmetic compositions include: good application, the production of a uniform film of excellent sheen or gloss, rapid drying time, good adhesion, a certain amount of flexibility, and good film strength to avoid cracking and flaking of the film. Moreover, an often overlooked, but desired, characteristic is the absence of irritation of the skin, hair, and/or nails upon which the film-forming cosmetic composition is applied.
To achieve the above-identified characteristics, film-forming cosmetic compositions conventionally have a mixture of film forming agents. Typically, cellulose-based film formers, in particular, nitrocellulose or cellulose acetate butyrate, are used as “primary” film formers. Often, the primary film formers are combined with one or more “secondary” film formers, which increase the film-forming ability of the primary film former and improve the sheen and adhesion of the resulting films. Secondary film formers known in the art include alkyd resins, polyester resins, acrylic resins, low molecular weight polyurethane resins, polyamide resins, vinyl resins, arylsulfonamide aldehyde resins, and arylsulfonamide epoxy resins.
For example, U.S. Pat. No. 5,676,935 to Mellul et al. discloses that nitrocellulose, arylsulphonamide-epoxy resin, and polyurethane have been used as film-forming materials. However, polyurethanes presently used in the art are difficult to stabilize in pigmented cosmetic compositions. Generally, combining polyurethane resins and pigments within a single cosmetic composition results in the pigments falling out of the suspension, which is clearly undesirable.
U.S. Pat. No. 6,080,413 to Ellingson et al. is directed to polyurethane nail polish compositions that have from about 0.1% to about 40% by weight of a water-insoluble, film-forming polyurethane, and a carrier having a liquid diluent. The diluent has water, and one or more volatile organic solvents.
U.S. Pat. No. 6,123,931 also to Ellingson et al. is directed to polyurethane and polyacryl nail polish compositions. These compositions have from about 0.1% to about 40% by weight of a water-insoluble, film-forming polymer, water, and one or more volatile organic solvents. However, the polymer is one or more polyacryls, polymethacryls, polyurethane-polyacryl mixtures, polyurethane-polymethacryl mixtures, urethane-acryl copolymers, and mixtures thereof.
Notwithstanding the foregoing, it has been unexpectedly discovered that a cosmetic composition, particularly a nail enamel composition, including a cellulose-based primary film forming agent, in combination with one or more high molecular weight polyurethane resins as a secondary film forming and plasticizing agent, and, optionally, one or more epoxy resins, results in increased adhesion of the cosmetic composition onto the nail, superior flexibility (displacement), durability, film strength, and no significant loss of gloss over time.
Moreover, unlike conventional nail enamel compositions where the pigmented nail enamel coating transfers coating if the nails are rubbed onto, for example, a paper napkin, notwithstanding that the initial drying time (10 to 60 minutes) has passed and the nails appear perceptively dry, the nail enamel coating of the present composition is significantly more transfer resistant once the nails are perceptively dry.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a cosmetic composition with a combination of film-forming agents for application to the skin and nails.
It is another objective of the present invention to provide such a cosmetic composition having improved gloss, wear-resistance, adhesion, and flexibility and is more transfer resistant in less time.
These and other objects of the present invention are achieved by a cosmetic composition, preferably in the form of a nail polish, comprising a ceilulose-based primary film former, one or more high molecular weight polyurethanes, and, optionally, one or more arylsulfonamide epoxy resins.
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a cosmetic composition, preferably in the form of a nail polish or other film-forming cosmetic composition. The composition has at least one primary film forming material and one or more high molecular weight polyurethane resins. Optionally, the cosmetic composition has at least one arylsulfonamide epoxy resin.
Preferably, the primary film former is a cellulose-based film former. More preferably, nitrocellulose is the primary film former. However, many cellulose-based materials, such as cellulose acetate, cellulose acetate butyrate, and ethyl cellulose, may be used either in combination with or as an alternative to nitrocellulose.
The cellulose-based primary film former is preferably present in an amount about 5 percent by weight (wt %) of the total weight of the composition to about 15 wt %. More preferably, the primary film former is about 7 wt % to about 12.5 wt % of the total weight of the composition.
An essential aspect of the present invention is the use of one or more high molecular weight polyurethane resins, which function as both film formers and plasticizers. Preferably the high molecular-weight polyurethane resins are polyether-type, high-molecular weight, polyurethane resins having an average molecular weight (MW) in the range of about 20,000 to about 80,000. The t
g
(glass transition temperature) of the preferred high-MW polyurethane resins is in the range of about −4° C. to about −20° C. and, more preferably, about −19° C. More preferred high-MW polyurethane resins have one of the following structures:
[—O—CH (CH
3
)CH
2
O)
20
—C(O)—NH—R—NH—C(O)—] Structure 1
[—O—(CH
2
)
4
O)
10
—C(O)—NH—R—NH—C(O)—] Structure 2
wherein R is an aliphatic moiety. Aliphatic polyurethane resins are preferred because they are more stable than aromatic polyurethane resins.
The high-MW polyurethane resins on a percent solids basis are preferably present in an amount about 2 wt % to about 15 wt %, and, more preferably, about 5 wt % to about 10 wt %.
Arylsulfonamide epoxy resins may also be included. For example, tosylamide epoxy resin may be added to the composition. Such arylsulfonamide epoxy resins enhance the aesthetics and gloss of the composition, but are not necessary to the functioning of the invention. When used, arylsulfonamide epoxy resins are preferably present in an amount about 1 wt % to about 15 wt % and, more preferably, about 3 wt % to about 8 wt %.
One or more plasticizers may also preferably be included in cosmetic compositions according to the present invention, but are not essential. When used, the plasticizer preferably is present in an amount about 1 wt % to about 9 wt % and, more preferably, about 2 wt % to about 5 wt %. Plasticizers useful in the present invention are those known in the art, including, without limitation, dibutyl phthalate (DBP) and other phthalates, tributyl acetyl citrate and other citrates, ethyl toluene sulfonamide (ethyl tosylamide), n-cyclohexyl para-toluene sulfonamide, glycerol and other glycols, glycol ethers, glycol esters, hydrogenated castor oil or epoxidized oils, polyesters, polybutylenes, low-MW aliphatic polyurethanes (about 2000 to about 5000 MW), toluene sulfonamide urea formaldehyde, &ggr;-butyral lactone, n-butylphthalimide/isopropylphthalimide, ethylhexyl diphenyl phosphate, wool fat derivatives, chlorinated paraffins, glyceryl triacetate, camphor, sucrose acetate isobutyrate (SAIB), “slow” or high boiling solvents, low t
g
resins and polymers, and mixtures thereof. A more preferred cosmetic composition according to the present invention has ethyl toluene sulfonamide in an amount about 0.5 wt % to about 5 wt %. Conventional nail polish composi
Farer Alan
Lee Christian J.
Avon Products Inc.
Howard S.
Page Thurman K.
Santini Anthony M.
Sen Rupa
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