Aerosol antiperspirant product

Abstract

An antiperspirant aerosol product having good sustainability characteristics and comprising an anhydrous antiperspirant aerosol composition comprising particulate antiperspirant active suspended in a carrier oil, the ratio of propellant to base composition being from 2:1 to 4:1 by weight and an aerosol dispenser comprising a container body, an aerosol valve, and a valve actuator; characterised in that the particulate antiperspirant active comprises 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 an amino acid and the aerosol valve of the aerosol dispenser has a vapor phase tap (VTP) to restrictive tailpiece (RTP) ratio of from 0.6:1 to 1.2:1.

Claims

1. An antiperspirant aerosol product having a mean spray rate of from 0.35 g/s to 0.55 g/s and comprising: A) an anhydrous antiperspirant aerosol composition containing less than 0.5% by weight water and comprising a propellant and a base composition comprising particulate antiperspirant active suspended in a carrier oil, the ratio of propellant to base composition being from 2:1 to 4:1 by weight, the ratio of propellant to particulate antiperspirant 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 particulate antiperspirant active comprises 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; and the aerosol valve of the aerosol dispenser has a vapor phase tap (VPT) to restrictive tailpiece (RTP) ratio of from 0.6:1 to 1.2:1, this ratio relating to the minimum cross-sectional area of each, and wherein the diameter of the RTP is less than 0.8 mm.

2. The antiperspirant aerosol product according to claim 1, wherein the antiperspirant active is activated aluminium sesquichlorohydrate (AASCH) prepared by heat activation of aluminium sesquichlorohydrate (ASCH) with a water soluble calcium salt and an amino acid.

3. The aerosol antiperspirant product according claim 1, wherein the ratio of carrier oil to antiperspirant active is from 1.2:1 to 2:1 by weight.

4. The aerosol antiperspirant product according to claim 1, having a VPT to RTP ratio of 0.7:1 to 1.1:1.

5. The aerosol antiperspirant product according to claim 1, wherein the carrier oil comprises volatile silicone oil.

6. The aerosol antiperspirant product according to claim 1, wherein the carrier oil comprises non-volatile oil.

7. The aerosol antiperspirant product according to claim 1, wherein the diameter of the RTP is less than 0.7 mm.

8. The aerosol antiperspirant product according to claim 1, having a mean spray rate of from 0.35 g/s to 0.45 g/s.

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

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

11. The aerosol antiperspirant product according to claim 1, wherein the anhydrous antiperspirant aerosol composition is free of ethanol.

Description

EXAMPLES

(1) In the following examples, all parts, percentages and ratios 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 ratio of propellant to antiperspirant base as indicated.

(5) TABLE-US-00001 TABLE 1 Example 1 2 3 Component Wt. % 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 11.5:1 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% propylene carbonate).