Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-02-28
2003-02-18
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...
C510S156000, C510S463000, C510S473000, C510S475000
Reexamination Certificate
active
06521573
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to liquid personal wash composition comprising surfactant (e.g., synthetic surfactant with or without soap) and mixtures of hydrophobic polymer with emollient oils. Specifically, the polymers used in the mixtures must have minimum tackiness value (e.g., greater than about 100 g), defined also by MW and viscosity; and mixture must also have minimum viscosity (>3000 cps defined at 30° C.) and defined particle size. No more than maximum levels of cationic may be used.
BACKGROUND
The rinsing sensation a product has on the skin can be perceived by many consumers. In many parts of the world, notably China, Japan and other parts of Asia, a soap-like rinsing property (e.g., soap-like “draggy” feeling) is perceived as being thoroughly cleansing and is highly preferred.
Most mild cleansers, especially 2-in-1 moisturizing liquids such as Dove® or Olay®, however, do not provide consumer desirable soap-like rinsing characteristics.
Unexpectedly, it has been found that selection of the depositing moisturizing agents can be used to provide moisturizing liquids with soap-like rinsing attributes (e.g., as defined by “draggy” feel after certain number of counts). Specifically, by depositing large (e.g., 20-5000 micrometers), viscous (e.g., higher than 3000 cps at 30° C. at 1.0 S
−1
) drops of a blend of hydrophobic polymer and emollient oils, the desired skin-feel is obtained. Preferred hydrophobic polymers include high MW (i.e., MW>900, preferably>1000) C
2
-C
10
polyalkenes (e.g., polybutenes) and preferred oils which are mixable with the hydrophobic polymers include mineral oil, petrolatum, or triglycerides.
The use of hydrophobic polymers (e.g., polybutene) in shampoo and PW liquid compositions is not new as seen, for example, from U.S. Pat. No. 5,441,730 to Gough et al. and U.S. Pat. No. 5,580,550 to Gough et al.
WO 99/09948 and WO 99/09950 (both assigned to Procter & Gamble) both disclose compositions in which polybutenes of MW 600 to about 1000 are used to enhance rinsability. Among the long, long recitation of optional ingredients which may be used is included hydrocarbons such as mineral oils and petrolatum (see WO 99/09950 at page 27, line 16).
There is absolutely no teaching or suggestion in these references of the criticalities of the invention, e.g., using polymers which must have MW>900, preferably greater than 1000; using these necessarily in combination with oils of defined viscosity to obtain defined benefits; using critical size polymer/oil mixtures; and ensuring no more than certain level (less than 0.5%, preferably less than 0.3%) cationic is used (contrast with, for example, page 19, lines 12—13 of WO 99/09950 where cationic can be used up to levels as high as 3%).
U.S. Pat. No. 5,854,293 to Glenn, Jr. discloses liquid PW compositions containing large drop lipophilic moisturizing agent which agent may be a blend of petrolatum and polybutenes (column 3, lines 43-47).
Again, there is no recognition that polymers must be of certain size and certain molecular weight (e.g., higher than 900), that no more than certain amount of cationic may be used (contrast with column 5, lines 44-45) or that very specific criticalities will yield compositions which rinse well and provide “draggy” feel.
Finally, U.S. Pat. No. 5,869,070 to Dixon et al. disclose personal cleansing composition containing skin moisturizing agent which is selected from the group consisting of petrolatum, hydrogenated polybutene and mixtures thereof, where ratio of petrolatum to polybetaine is 3:1 to 5:1. The composition also comprises 0.5 to 1.0 part polyquaternium 10 and 1 to 2.5 parts sodium polyacrylate. There is no recognition that specific criticalities, e.g., less than 0.5% cationic, are required to achieve “draggy” feel as defined.
BRIEF DESCRIPTION OF INVENTION
Unexpectedly, applicants have found that use of specific polymers (i.e., minimum tackiness defined by minimum viscosity) in combination with specific oils provide not only moisturizing benefits, but also can provide good rinsability and soap-like “draggy” feel desirable by many consumers. Moreover, to the extent there is a balance between sticky feel of the polymers and greasy feel of oils, the invention provides for a method to achieve desired soap-like rinsability (e.g., rinsability with soap-like feel) by manipulating the polymer/oil ratio of the blend. Soap-like rinsability is dependent not only on polymer molecular weight and polymer/oil ratio, but also on low level (or absence) of cationic polymer.
More specifically, the invention comprises a personal cleansing composition having soap-like rinsability comprising:
(1) 70% to 99% of a lathering surfactant system containing 5 to 35% by wt. of a surfactant composition having a slippery, slightly draggy or draggy wet skin feel during rinsing after a six rubbing cycle as measured by in-shower rinsability evaluation method;
(2) 1 to 30% by wt. of a polymer/oil blend comprising:
(a) 20 to 90% of a polymer having MW greater than about 900, preferably greater than about 1000 and viscosity greater than 10,000 centistoke at 30° C. at 1.0 S
−1
and a tackiness of greater than about 100 grams as measured by tackiness test;
(b) 10% to 80% of a hydrophobic oil,
wherein tackiness of polymer/oil blend is 30-400 g measured by tackiness test,
wherein viscosity of polymer/oil blend is higher than 3000 centistoke at 30° C. at 1.0 S
−1
; and
wherein average particle size of blend is 20 to 5000 micrometers;
(3) 0.1 to 10% by wt. of organic, inorganic or polymeric stabilizer in amount sufficient to provide physical stability of oil droplets at 40° C. for over 4 weeks;
wherein composition has less than 0.4 wt. % cationic polymer,
wherein composition has draggy or very draggy wet skin feel in less than 8 rubbing cycles as determined by in-shower evaluation method.
DETAILED DESCRIPTION OF INVENTION
The present invention relates to personal cleansing compositions comprising polymer/oil blends which are used to provide soap-like rinsability as measured by in-shower evaluation test. The invention further relates to a method of providing soap-like rinsability by carefully balancing ratio of polymer/oil and ensuring no more than maximum amount cationic polymer is used.
Specifically, the compositions of the invention comprise:
(1) 70-99% lathering surfactant system containing 5 to 35% by wt. surfactant composition with slippery, slightly draggy or draggy wet skin feel after 6 rubbing cycles (as measured by defined test),
(2) 1 to 30% of specifically defined polymer/oil blends wherein polymers are selected for specific tackiness (as further defined by MW and viscosity); and polymer oil blends have specific tackiness, viscosity and average particle size; and
(4) stabilizer;
wherein the composition has less than 0.4 wt. % cationic polymer and wherein selection yields compositions which are soap-like in feel (draggy or very draggy wet skin feel in less than 8 rubbing cycles).
Each of the various components of the composition is described in more detail below.
Surfactant System
The composition of the invention comprises 70 to 99% of a “lathering” surfactant system containing 5 to 35% by wt. surfactant composition having a slippery, slightly draggy or draggy wet skin feel (as defined by in-shower rinsability evaluation method).
The surfactants in the composition may be anionic, nonionic, amphoteric/zwitterionic, cationic or mixtures thereof as long as the compositions retain minimal lathering profile. That is, the surfactant or mixture combined should have an equilibrium surface tension between 15 and 50 dynes/cm, preferably 20-40 dynes/cm as measured at CMC at 25° C. Some surfactant mixes can have tension lower than those of individual components. Also the overall surfactant system, in the absence of polymer/oil blend, has slippery, slightly draggy or draggy wet skin rinsing feel (in contrast to very draggy feeling produced by soap-based cleansers).
The anionic surfactant may be, for example, an aliphatic sulfonate, such as a primary alkane (e.g., C
8
Aronson Michael Paul
Tsaur Liang Sheng
Koatz Ronald A.
Ogden Necholus
Unilever Home & Personal Care USA , division of Conopco, Inc.
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