Aerosol antiperspirant product

Abstract

An antiperspirant aerosol product having good environmental sustainability and comprising an anhydrous antiperspirant aerosol composition comprising an AP active comprising a basic aluminium chloride compound of formula Al.sub.2(OH).sub.4.4Cl.sub.1.6 to Al.sub.2(OH).sub.4.9Cl.sub.1.1, water soluble calcium salt and amino acid, and an aerosol dispenser comprising a container body, an aerosol valve, and a valve actuator; characterised in that the product has a Combined Sustainability Index (CSI) of less than 3.0, where:
CSI=Al.sub.F+VOC.sub.F+M.sub.CB/N
Al.sub.F being the weight (in centigrams) of aluminium expelled per spray;
VOC.sub.F being the weight of VOC (in grams) expelled per spray;
M.sub.CB being the weight of metal (in grams) in the container body; and
N is the number of spray applications possible from the fully charged product, each figure being based on a spray duration of 2 seconds.

Claims

1. An antiperspirant aerosol product comprising: A) an anhydrous antiperspirant aerosol composition consisting of a propellant and a base composition, the base composition comprising an antiperspirant (AP) active comprising a basic aluminium chloride compound of formula Al.sub.2(OH).sub.4.4Cl.sub.1.6 to Al.sub.2(OH).sub.4.9Cl.sub.1.1, a water soluble calcium salt and an amino acid, the ratio of propellant to AP active being from 5:1 to 10:1 by weight, and B) an aerosol dispenser comprising: a container body, an aerosol valve, and a valve actuator; wherein the product has a Combined Sustainability Index (CSI) of less than 3.0, where the CSI is calculated as the numeric sum of a weight (in centigrams) of aluminium expelled per spray, a weight (in grams) of VOC (volatile organic compounds) expelled per spray and a weight (in grams) of metal in the container body divided by a number of spray applications possible from a fully charged product, based on a spray duration of 2 seconds; wherein the aerosol valve of the aerosol dispenser comprises a vapour phase tap (VPT) and a restrictive tailpiece (RTP).

2. An antiperspirant aerosol product comprising: A) an anhydrous antiperspirant aerosol composition consisting of a propellant and a base composition, the base composition comprising an antiperspirant (AP) active comprising a basic aluminium chloride compound of formula Al.sub.2(OH).sub.4.4Cl.sub.1.6 to Al.sub.2(OH).sub.4.9Cl.sub.1.1, a water soluble calcium salt and an amino acid, the ratio of propellant to AP active being from 5:1 to 10:1 by weight, and B) an aerosol dispenser comprising a container body, an aerosol valve, and a valve actuator; wherein the product has a Combined Sustainability Index (CSI) of less than 3.0, where:
CSI=Al.sub.F+VOC.sub.F+M.sub.CB/N Al.sub.F being the weight (in centigrams) of aluminium expelled per spray; VOC.sub.F being the weight of volatile organic compounds (VOC) (in grams) expelled per spray; M.sub.CB being the weight of metal (in grams) in the container body; and N is the number of spray applications possible from the fully charged product, each figure being based on a spray duration of 2 seconds; wherein the aerosol valve of the aerosol dispenser comprises a vapour phase tap (VPT) and a restrictive tailpiece (RTP).

3. An antiperspirant aerosol product comprising: A) an anhydrous antiperspirant aerosol composition consisting of a propellant and a base composition, the base composition comprising an antiperspirant (AP) active comprising a basic aluminium chloride compound of formula Al.sub.2(OH).sub.4.4Cl.sub.1.6 to Al.sub.2(OH).sub.4.9Cl.sub.1.1, a water soluble calcium salt and an amino acid, the ratio of propellant to AP active being from 5:1 to 10:1 by weight, and B) an aerosol dispenser comprising: a container body, an aerosol valve, and a valve actuator; wherein a weight (in centigrams) of aluminium expelled per spray is less than 2.20; a weight of volatile organic compounds (VOC) (in grams) expelled per spray is less than 0.80 and a weight of metal (in grams) in the container body divided by a number of spray applications possible from a fully charged product is less than 0.40; wherein the aerosol valve of the aerosol dispenser comprises a vapour phase tap (VPT) and a restrictive tailpiece (RTP).

4. The product according to claim 1, wherein the metal in the container body is predominately aluminium.

5. The product according to claim 1, wherein the AP active in the base composition is a particulate AP active suspended in a carrier oil.

6. The product according to claim 1, wherein the ratio of propellant to base composition in the antiperspirant composition is from 2:1 to 4:1 by weight.

7. The product according to claim 1, wherein the VPT to RTP ratio is from 0.6:1 to 1.2:1.

8. The product according to claim 1, wherein the VPT to RTP ratio is from 0.7:1 to 1.1:1.

9. The product according to claim 1, wherein the AP active is activated aluminium sesquichlorohydrate (AASCH) prepared by heat activation of aluminium sesquichlorohydrate (ASCH) with calcium chloride and glycine.

10. The aerosol antiperspirant product according to claim 1, wherein the diameter of a restrictive tailpiece (RTP) is less than 0.8 mm.

11. The aerosol antiperspirant product according to claim 1, having a mean spray rate of from 0.35 g/s to 0.55 g/s.

12. The aerosol antiperspirant product according claim 1, wherein the ratio of propellant to AP active is from 6:1 to 9:1.

13. The aerosol antiperspirant product according to claim 1, wherein the ratio of propellant to base composition is 2:1 to 3.5:1.

14. The aerosol antiperspirant product according to claim 1, wherein the CSI is less than 2.85.

Description

EXAMPLES

(1) In the following examples, all parts and percentages are by weight unless indicated otherwise.

(2) The AASCH AP active as detailed in Table 1 may be prepared by the following process. 15 parts of Reach 301 powder, 0.9 parts anhydrous calcium chloride and 2.0 parts glycine are combined with 75.9 parts water at room temperature. The solution is heated at 85 C. for 18 hours in sealed 1 L jars. The resulting solution is spray-dried using a bench-top Lab-Plant-05 spray dryer (inlet temperature 250, outlet temperature 112+/1, jet atomisation).

(3) The particulate AASCH obtained from the above process would typically have a mean (D50) particle size of from 5 to 10 microns.

(4) Compositions as described in Table 1 may be prepared by the following procedure. The antiperspirant base is prepared by charging a vessel with the base's liquid and solid components in the amounts specified in Table 1 and agitating the resulting mixture until the AASCH AP active is suspended. The base composition is introduced into an aluminum container that is fitted with a commercially available valve having a single internal metering orifice, a vapor phase tap, a VPT to RTP ratio as indicated, and a dip tube of 3.2 mm inner diameter. The container is sealed and pressurized to an internal pressure as indicated by injection of a hydrocarbon propellant (propane, butane and isobutane [CAP-40, ex Calor]) in a weight ratio of propellant to antiperspirant base as indicated.

(5) TABLE-US-00001 TABLE 1 Example Component (wt. %) 1 2 3 AASCH (AP active) 9.4 8.1 6.9 Volatile Silicone (D5) 6.0 5.3 6.3 PPG-14 butyl ether 5.6 4.8 4.8 Hydrophobically modified clay 1.0 0.8 0.7 Fragrance* 2.4 2.0 2.0 CAP 40 (propellant) 75.6 79.0 79.3 CAP40:AASCH 8.0:1 9.8:1 11.8:1 CAP:Antiperspirant Base 3.1:1 3.8:1 3.8:1 VPT diameter (mm) 0.5 0.64 0.64 RPT diameter (mm) 0.5 0.76 0.76 VPT:RTP 1:1 0.7:1 0.7:1 *Also includes a small amount (0.02-0.03%) of propylene carbonate.

(6) Table 2 contrasts the CSI of certain Examples according to the present invention (indicated by numbers) with a Comparative Example (A). The Table illustrates how the key elements comprising the CSI affect it. Each of the Examples (including the Comparative Example) had a total can life of about 120 seconds, equating to 60 two second sprays (i.e. N=60). Each of the Examples (including Comparative Example A) had the propellant as 100% VOC and no other VOC present in the base. The Comparative Example had ACH as the AP active and each of the Examples according to the invention had AASCH as the AP active. AP active levels relate to levels in the total composition.

(7) Comparative Example A is a conventional antiperspirant aerosol product having a spray rate of about 0.75 g/s. The Examples according to invention are concentrated antiperspirant aerosols, having a higher base to propellant ratio and a lower spray rate of about 0.40 g/s. The Examples according to the invention have aerosol valves having a VTP and an RTP, the VTP to RTP ratio being between 0.8:1 and 1.2:1.

(8) From Table 2, it can be seen that each of the Examples has a higher base to propellant ratio than the Comparative Example. This results in a lower VOC.sub.F value and enables a lower container body weight to be employed without reduction of the AP active level.

(9) TABLE-US-00002 TABLE 2 Example A 4 5 6 7 8 Base to propellant ratio 13:87 26:74 26:74 20:80 25:75 30:70 Wt. of composition (g) 90 48 48 48 48 48 VOC per spray [VOC.sub.F] (g) 1.305 0.592 0.592 0.64 0.60 0.56 AP active level (%) 6.15 11.53 3.80 10.00 9.40 6.15 AP active per spray (g) 0.092 0.092 0.030 0.080 0.075 0.049 Al content of AP active (%) 26.4 22.6 22.6 22.6 22.6 22.6 Al per spray [Al.sub.F] (cg) 2.44 2.08 0.69 1.81 1.70 1.11 Container Body Wt. [M.sub.CB] (g) 27 19 19 22 19 19 M.sub.CB/N = 0.45 0.317 0.317 0.367 0.317 0.317 CSI = Al.sub.F + VOC.sub.F + M.sub.CB/N = 4.20 2.99 1.60 2.82 2.62 1.99

(10) With regard to the AP level in the Examples, Example 4 contains a level such that the AP applied during a single spray is the same as that applied from the Comparative Example; however, the level of antiperspirant benefit delivered will be much greater because of the superior efficacy of AASCH. Example 5 represents an ultra-low CSI product that would deliver extremely low white marks without undue compromise to the antiperspirancy performance. It will be noted that the lower Al content of AASCH compared with ACH in the Comparative Example further reduces the CSI for each of the Examples according to the invention.