Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
1999-04-30
2001-01-16
Warden, Jill (Department: 1743)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S141000, C510S152000, C510S153000, C510S155000, C510S156000, C510S440000, C510S447000, C510S451000, C510S466000, C510S474000, C510S484000, C510S486000, C510S495000, C510S504000, C510S511000
Reexamination Certificate
active
06174845
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to bar compositions, particularly (although not exclusively) synthetic soap bar compositions, able to deliver beneficial agents (e.g., silicone) in higher amounts than previously possible. In particular, the invention relates to bar compositions comprising both a base phase and a stripe (emollient containing) phase wherein the stripe phase comprises entrapped emollient droplets (entrapped in that the medium in which the emollient is carried, i.e, polyalkylene glycol, is thickened so that droplets are trapped).
BACKGROUND OF THE INVENTION
It has long been a desirable goal to deliver some kind of benefit agent (e.g., silicone or other oils) to the skin through a personal wash composition.
In liquid cleansers, for example, cationic hydrophilic polymers such as Polymer JR® from Amerchol or Jaguar® from Rhone Poulenc have been used to enhance delivery of benefit agents (EP 93,602; WO 94/03152; and WO 94/03151). In applicants' copending application, U.S. Ser. No. 08/412,803 to Tsaur et al., separate hydrogel particles act as a structure to entrap the benefit agent in concentrated form.
In the subject invention, entrapment of benefit agent is achieved by producing compositions comprising emollient, wherein the medium in which the droplets are found (e.g., polyalkylene glycol) is thickened with a thickening agent (e.g., fumed silica) so that the droplets are entrapped in the polyethylene glycol. The emollient-containing, thickened carrier compositions may be dispersed throughout a bar (as in applicants copending application to Farrell et al. filed on same date as said application) or inserted as a concentrated composition into the bar (e.g., as a stripe).
Delivery of benefit agents (e.g., silicone) has proven difficult in bar compositions for a number of reasons. If the benefit agent does not remain sufficiently discrete from other components in the bar composition, for example, the generally hydrophobic benefit agent will contact hydrophobic materials in the bar mix rather than be free to deposit on the skin or other substrate. Thus, little or no benefit agent will be present in the final bar (after milling, plodding and extrusion of chips) to be delivered to the skin. If the benefit agent is too viscous, it tends to become entangled in the processing equipment and become too difficult to process.
U.S. Pat. No. 5,154,849 to Visscher et al. teaches bar compositions containing a silicone skin mildness/moisturizing aid component. In one embodiment, the silicone component may be mixed with a carrier which is selected to facilitate incorporation of the silicone. Preferred carrier is said to be polyethylene glycol. At column 16, the reference describes that silicone is mixed into melted Carbowax (polyethylene glycol). The mixture is cooled to form flakes and that the flakes are preferably added to an amalgamator.
The compositions of Visscher et al., however, do not teach or suggest thickening the alkylene glycol carrier with a thickening agent (e.g., fumed silica) in order to more readily entrap the emollient. Because the silicone drops are not “contained” by the carrier (e.g., alkylene glycol carrier) in which they are delivered, the benefit agent silicone readily escapes from the carrier and significantly interferes with bar processing (e.g., a viscous, gooey mess is formed which cannot be readily processed) and readily clogs the machinery. By contrast, the entrapped emollient droplets of the invention do not interfere with processing.
Moreover, the present invention is particularly concerned with inserting (e.g., by injection, extrusion or coextrusion) separate compositions comprising the entrapped emollient droplets (i.e., entrapped in the thickened carrier) into bars such that they occupy concentrated regions or domains of the bar (rather than being dispersed as in copending application to Farrell et al., filed on same day). Visscher et al. neither teaches nor suggests concentrated, macroscopic regions of emollient drops from which deposition is enhanced.
Finally in a copending application to He et al., applicants teach low viscosity oils or emollients which are pre-thickened with hydrophobic polymers having low degree of crystallinity. That application teaches thickening of the oils themselves (i.e., thickening low viscosity oils) rather than thickening carriers in which emollients (preferably large size droplet emollients) are found.
SUMMARY OF THE INVENTION
In the subject invention, applicants have unexpectedly found that, when the medium in which emollients are found (i.e., polyalkylene glycol) is thickened with thickening agent, emollient droplets are entrapped in the thickened medium and are able to better deposit emollient from bar compositions. Specifically, the subject invention relates to bar compositions into which the entrapped emollients (present in thickened carrier compositions) are inserted (by injection, extrusion or coextrusion) into a surfactant containing base bar composition to form concentrated regions or domains from which the emollient readily deposits. Said concentrated domains/stripes are macroscopic regions which may range in width from 1 micron(&mgr;) to the width of the bar, preferably, 10&mgr; to ½ the width of the bar; and may range in length from 1&mgr; to the length of the bar, preferably being striped along the entire length of the bar. Preferably the emollient containing composition will be striped into the bar as shown in FIG.
1
.
Specifically, the invention comprises a bar composition comprising:
(a) 40% to 99% by wt. of a surfactant selected from the group consisting of soap, anionic surfactants, nonionic surfactants, amphoteric surfactants, cationic surfactants and mixtures thereof; and
(b) 1% to 60% of a thickened carrier, emollient-containing composition (stripe composition) comprising:
(1) 20% to 80% by wt. emollient composition polyalkylene glycol;
(2) 5% to 40% by wt. emollient composition of benefit agent;
(3) 0.01% to 30%, preferably 5 to 20%, more preferably 5% to 10% thickening agent;
(4) 0% to 10% by wt. emollient composition water; and
(5) 0% to 15% by weight emollient composition fatty acid/structure and fillers,
wherein said stripe composition (b) comprises emollient droplets having average micron size of 5 microns or greater (upper limit defined when drops are no longer dissolved, but continuous) and
wherein said entrapped emollient droplets are present in concentrated region (i.e, 1 micron to width of bar by 1 micron to length of bar).
The surfactant system may be a pure soap surfactant system or the surfactant system may comprise:
(a) a first synthetic surfactant which is an anionic surfactant; and
(b) a second synthetic surfactant selected from the group consisting of a second anionic different from the first, a nonionic, an amphoteric and mixtures thereof.
A particularly preferred surfactant system comprises acyl isethionate as the first anionic and a sulfosuccinate or a betaine surfactant or mixtures of the two.
REFERENCES:
patent: 3294692 (1966-12-01), Kelly et al.
patent: 4017574 (1977-04-01), Joshi
patent: 4224266 (1980-09-01), Hunt et al.
patent: 5154849 (1992-10-01), Visscher et al.
patent: 5520840 (1996-05-01), Massaro et al.
patent: 5540854 (1996-07-01), Fair et al.
patent: 5770556 (1998-06-01), Farrell et al.
patent: 5783536 (1998-07-01), Farrell et al.
patent: 5817609 (1998-10-01), He et al.
patent: 5858939 (1999-01-01), Tsaur
patent: 5935917 (1999-08-01), Farrell et al.
patent: 5955409 (1999-09-01), Farrell et al.
patent: 94/03151 (1994-02-01), None
patent: 94/03152 (1994-02-01), None
Aronson Michael
Crookham Harry
Dalton James
Farrell Terence
Massaro Michael
Cole Monique T.
Koatz Ronald A.
Lever Brothers Company Division of Conopco, Inc.
Warden Jill
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