Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2003-10-09
2004-08-10
Ogden, Necholus (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S139000, C510S158000, C510S424000, C510S426000, C510S470000, C510S499000, C510S503000, C510S508000
Reexamination Certificate
active
06774096
ABSTRACT:
FIELD OF INVENTION
This invention relates to the use of a zinc oxide suspension in a surfactant-based product to reduce its skin irritation potential and optimize its compatibility with the skin. The surfactant-based product may be a hand dishwashing liquid, a liquid skin cleanser or any type of cleaning or cleansing product based on surfactants. The particularity of the zinc oxide suspension to decrease the skin irritation potential is to be highly effective even in already optimized surfactant-based product containing other types of counter-irritants such as amphoteric or nonionic secondary surfactants.
BACKGROUND OF THE INVENTION
The present invention relates to the use of zinc oxide particles in light duty liquid detergent compositions with high foaming properties, which can contain mixtures of anionic surfactants, amine oxide surfactant and alkyl polyglucoside surfactant, in order to decrease its skin irritabon potential and improve its skin compatibility.
No prior art related to the use of zinc oxide suspensions in surfactant-based products to decrease the irritation potential of the anionic surfactant have been found.
Zinc oxide suspension is used for other purposes or in other types of products as shown in the following patents. US5403506 describes a deodorant detergent composition containing as a deodorizing component a minor amount of zinc oxide having a particulate size no greater than about 10 microns. KR9300782 describes a soap composition containing metal oxide and ethyl alcohol. FR19750007063 and 19750306 describe the use of zinc oxide to prepare an opaque cleaning composition in tablet form. EP20000902097 and 20000204 describe a process using ultrafine particulate zinc oxide that has a low coagulation of primary particles and can be easily dispersed or suspended in a aqueous solvent without passing through a grinding process, that provides a cosmetic material with transparency and ultraviolet shielding ability. US19960590736 and 19960124 describe a deodorant soap or detergent composition containing a zinc compound and a polyamine. IE 19750000469 and 19750305 describe zinc oxide-containing detergent bars. US19990332007 describes photoprotective cosmetic compositions containing a metal oxide nanopigment, which may be zinc oxide, and an acrylic terpolymer, and the use of these compositions for protecting keratinous material against ultraviolet radiation. WO1997EP00714 and 19970213 describe compositions containing an antifungal and a sulfur compounds for body and hair cleaning products. EP00902097.5 (WO0046152 request) describes cosmetic products containing ultrafine particulates of zinc oxide and the process to formulate them. WOEP0011713 describes a drug-tape composition containing zinc oxide. WOUS0140234 describes skin protective formulations with micronized zinc oxide that allow to reduce skin damages due to light and sun exposure. WOIB0100717 describes a skin protective aerosol composition containing zinc oxide to protect baby bottom from erythema. WOGB0101949 describes the use of zinc oxide as a biostatic agent. WOFR0200046 describes the use of zinc oxide as mineral filter for UV in cosmetic compositions. EP00907548.2 (WO0050503 request) describes redispersible gels with zinc oxide nanoparticles.
Zinc oxide is also used in cosmetic products for the following purposes: zinc oxide may be found in facial masks to absorb excess of sebum (Ella Baché); zinc oxide may be found in Baby Balsam or cream to protect skin from redness in the diaper area (Weleda, Calidou, Mustela); zinc oxide may be found in Skin scrubbing products for its skin lightening properties (Ella Baché); zinc oxide may be used for its astringent and antiseptic properties in drugs and cosmetic products, as well as for its UV A and B radiation blocking effect.
Some publications describing the role of zinc oxide are hereafter: Lansdown AB. Influence of zinc oxide in the closure of open skin wounds. Intl J Cosmet Sci 15: 83-85 (1993). This paper shows that zinc oxide offers potential benefits in skin wound healing; Fairhurst D. Zinc Oxide. Soap Perfum Cosmet 72: 36-37 (1999). This paper describes the beneficial role of zinc oxide in protecting skin from UV A.; Lansdown AB. Zinc and titanium oxides: promising UV-absorbers but what influence do they have on the intact skin ? Intl J Cosmet Sci 19: 167-172 (1997). This paper describes percutaneous absorption of microfine zinc oxide with the influence of its vehicle. Prevedello M. Biochemical interactions of metallic ions in make-up with the skin. SOFW 128: 66-68 (2002). This paper reviews the use of metallic ions in make-up and says that zinc oxide is recommended in order to prevent and heal minor skin disorders as well as to treat the delicate baby skin. Hayashi S et al. The relationship between UVB screening and cytoprotection by microcorpuscular zinc oxide or ascorbate against DNA photodamage and membrane injuries in keratinocytes by oxidative stress. J Photochem Photobiol B 64: 27-35 (2001). This paper describes that microcorpuscular zinc oxide is thought to be cytoprotective through reduction of reactive oxygen species generation, cyclobutane-type pyrimidine dimmers formation and cell membrane disintegration. Baldwin S et al. Skin benefits from continuous topical administration of a zinc oxide/petrolatum formulation by a novel disposable diaper. J Eur Acad Dermatol Venereol 15 (Suppl 1): 5-11 (2001). In the paper, human skin is exposed to the formulation prior to an irritating challenge with SLS and shows a 3.5×reduction in skin barrier damage and skin erythema.
SUMMARY OF THE INVENTION
It has now been found that a light duty liquid detergent can be formulated with a mixture of surfactants and nanoparticulates of zinc oxide in the size of 10-30 nm.
The addition of the zinc oxide particulates does not incur a detriment to grease cleaning efficacy of the dishwashing liquid nor to the foaming properties of the finished product. The skin irritation potential of the finished is highly improved by the presence of the zinc oxide suspension in the product.
As compared to the same product without zinc oxide, the zinc oxide-containing product induces much less erythematous reaction and skin barrier alteration when the products are in contact with the skin for a long period. Benefits in terms of less skin drying and better respect of skin surface hydration are also expected when adding nanoparticles of zinc oxide in the product. Similar anti-irritant effects are also expected in any type of surfactant-based product.
One object of this invention is to provide a light duty liquid detergent composition which comprises a sulfate surfactant, a sulfonate anionic surfactant, an alkyl polyglucoside surfactant, nanoparticulates of zinc oxide having a particle size of 10-30 nm and water.
Additional objects, advantages and novel features of the invention will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following or may be learned by practice of the invention. The objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.
DETAILED DESCRIPTION OF THE INVENTION
A cleaning composition for all purpose cleaners, light duty liquids, shampoos such as hair cleaning, foam baths, liquid hand soaps, and shower gels which comprises approximately by weight:
(a) 1% to 50%, more preferably 2% to 40% of at least one surfactant selected from the group consisting of sulfonated anionic surfactants, sulfated anionic surfactants, zwitterionic surfactants, C
12
-C
14
alkanol amide surfactants, amine oxide surfactants, ethoxylated nonionic surfactants, ethoxylated/propoxylated nonionic surfactants and alkyl polyglucoside surfactants and mixtures thereof;
(b) 0.5% to 10%, more preferably 1% to 8% of at least one solubilizer;
(c) 0.01% to 1%, more preferably 0.03% to 0.5% of Nano-particulates of zinc oxide which function as an anti-irritant system for the one or more surfactants; a
Colgate-Palmolive Co.
Nanfeldt Richard E.
Ogden Necholus
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