EP0191628A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Preparation of basic aluminium halides
Assignee: Unilever PLC
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Filing: 1986-02-11
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Granted: —
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Expires: 2006-02-11
Abstract
Abstract The disclosure concerns a process for the manufacture of basic aluminium halides in powder form which have an aluminium:halide molar ratio of 1.7:1 to 2.2:1 and contain more than 20% of the aluminium in the Band III fraction as determined by a chromatographic procedure. The disclosure centres on the finding of reaction conditions for the known interaction between aluminium and aluminium halides which lead directly to a solution of a basic aluminium halide having more than 20% of the aluminium in the Band III fraction. The temperature of reaction is 50° to 105°C and the final aluminium concentration of the solution is 0.8% to 6.75%. The solution is dried, preferably spray dried or freeze dried, to give the powder. The preparation of powders having at least 20% of the aluminium contained in Al 13 O 40 species is also described.
Inventors
- 👤 Peter William Inward
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:38
CPC Classifications
A; A61; A61Q; A61Q15/00; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/26; C; C01; C01F; C01F7/00; C01F7/02; C01F7/48; C01F7/56; C01F7/57; C01F7/64; C01P; C01P2002/00; C01P2002/80; C01P2002/86; C01P2006/00; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
204 words
Process of making a basic aluminium halide in powder form having an aluminium:halogen molar ratio of from 1.7 to 2.2 : 1 and having at least 20% of the aluminium contained in the Band III fraction which process comprises the steps of:- a) dissolving metallic aluminium in an aqueous starting solution of an aluminium compound selected from aluminium chloride and aluminium bromide, said starting solution being held at a temperature of about 50°C to about 105°C for a time just long enough to dissolve sufficient aluminium to produce an aqueous solution of a final basic aluminium halide having an aluminium:halide molar ratio in the range 1.7:1 to 2.2:1, the concentration of the aluminium in the starting solution and the amount of aluminium dissolved being such that the aluminium concentration in the solution of the final basic aluminium halide is from 0.8% to 6.75% by weight and said final basic aluminium halide having at least 20% of the aluminium contained in the Band III fraction; and b) drying the solution of the final basic aluminium halide so as to give the final basic aluminium halide in the form of an hydrated powder having at least 20% of the aluminium contained in the Band III fraction.
Claim 2
Dependent Claim
204 words
Process of making a basic aluminium halide in powder form having an aluminium:halogen molar ratio of from 1.7 to 2.2 : 1 and having at least 20% of the aluminium contained in the Band III fraction which process comprises the steps of:- a) dissolving metallic aluminium in an aqueous starting solution of an aluminium compound selected from aluminium chloride and aluminium bromide, said starting solution being held at a temperature of about 50°C to about 105°C for a time just long enough to dissolve sufficient aluminium to produce an aqueous solution of a final basic aluminium halide having an aluminium:halide molar ratio in the range 1.7:1 to 2.2:1, the concentration of the aluminium in the starting solution and the amount of aluminium dissolved being such that the aluminium concentration in the solution of the final basic aluminium halide is from 0.8% to 6.75% by weight and said final basic aluminium halide having at least 20% of the aluminium contained in the Band III fraction; and b) drying the solution of the final basic aluminium halide so as to give the final basic aluminium halide in the form of an hydrated powder having at least 20% of the aluminium contained in the Band III fraction.
Claim 3
Dependent Claim
17 words
Process as claimed in Claim 1 wherein said starting solution is an aqueous solution of aluminium chloride.
Claim 4
Dependent Claim
32 words
Process as claimed in Claim 1 or Claim 2 wherein the hydrated powder of the final basic aluminium halide has at least 25% of the aluminium contained in the Band III fraction.
Claim 5
Dependent Claim
26 words
Process as claimed in any of Claims 1 to 3 wherein the final basic aluminium halide powder has an aluminium:halide molar ratio of 1.9 to 2.1:1.
Claim 6
Dependent Claim
34 words
Process as claimed in any of Claims 1 to 4 wherein the drying of the solution of the final basic aluminium halide in step (b) is carried out by spray drying or freeze drying.
Claim 7
Dependent Claim
34 words
Process as claimed in any of Claims 1 to 5 wherein at least 20% of the aluminium of the final basic aluminium compound formed in step (a) is in the form of Al13040 species.
Claim 8
Dependent Claim
44 words
Process as claimed in any of Claims 1 to 6 wherein the hydrated powder of the basic aluminium halide contains at least 25% of the aluminium in the Band III fraction and at least 20% of the aluminium in Al 13 O 40 species.
Claim 9
Dependent Claim
32 words
A spray-dried or freeze dried hydrated powder of a basic aluminium chloride having an aluminium:chlorine molar ratio of 1.7:1 to 2.2:1 and having at least 25% of the aluminium in Al13040 species.
Claim 10
Dependent Claim
32 words
A spray-dried or freeze dried hydrated powder of a basic aluminium chloride having an aluminium:chlorine molar ratio of 1.7:1 to 2.2:1 and having at least 25% of the aluminium in Al13040 species.
Claim 11
Dependent Claim
25 words
An antiperspirant composition comprising a powdered basic aluminium halide made by the process claimed in any of the preceding claims suspended in a carrier medium.
Claim 12
Dependent Claim
43 words
An antiperspirant composition comprising a powdered basic aluminium halide suspended in a carrier medium wherein the basic aluminium halide has an aluminium:halide molar ratio of 1.7 to 2.2:1 and has at least 20% of the aluminium contained in Al 13 O 40 species.
Claim 13
Dependent Claim
43 words
An antiperspirant composition comprising a powdered basic aluminium halide suspended in a carrier medium wherein the basic aluminium halide has an aluminium:halide molar ratio of 1.7 to 2.2:1 and has at least 20% of the aluminium contained in Al 13 O 40 species.
References Cited (Backward Citations)
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