US4701269A
Expired / Lapsed
US
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Waterproofing leather and skins
Assignee: BASF SE
•
Filing: 1986-08-13
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Granted: 1987-10-20
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Expires: 2006-08-13
Abstract
Abstract A process for waterproofing leather and skins with a silicone oil and the salt of an N-(C 9 -C 20 -acyl)-amino acid as an emulsifier for the silicone oil, which is carried out in the aqueous phase during or after retanning, and the use of salts of N-acylamino acids as emulsifiers for silicone oils in the waterproofing of leather and skins in the aqueous phase, and the mixtures used for this purpose.
Inventors
- 👤 Herbert Bay
- 👤 Rudi Widder
- 👤 Guenter Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:45
CPC Classifications
C; C14; C14C; C14C9/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
281 words
A process for waterproofing leather and skins with a silicone oil in the presence of a salt of an N-(C 9 -C 20 -acyl)-amino acid as an emulsifier, wherein (a) an aqueous emulsion of a silicone oil, consisting of from 15 to 90% by weight of silicone oil, from 5 to 30% by weight of an alkali metal, ammonium or alkanolamine salt of an amino acid of 2 to 6 carbon atoms which has an acyl radical of a saturated or unsaturated fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl, and from not less than 5% by weight to the remainder to 100% by weight, of water, the emulsion being brought to pH 5-12, with an alkali metal hydroxide, ammonia or an alkanolamine, or (b) an anhydrous mixture of from 70 to 90% by weight of a silicone oil and from 10 to 30% by weight of an alkanolamine salt of an amino acid of 2 to 6 carbon atoms which has an acyl radical of a saturated or unsaturated fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl, in an amount of from 0.5 to 20% by weight, based on the shaved weight of the leather or wet weight of the skins, is allowed to act on the leather or skins being treated, in an aqueous liquor at pH 4.5-8.0, during or after retanning, after which the pH is brought to 3.0-5.0 and, if required, the leather or skins are after-treated in the aqueous solution with a divalent, trivalent or tetravalent metal salt conventionally used in tanning.
Claim 2
Dependent Claim
281 words
A process for waterproofing leather and skins with a silicone oil in the presence of a salt of an N-(C 9 -C 20 -acyl)-amino acid as an emulsifier, wherein (a) an aqueous emulsion of a silicone oil, consisting of from 15 to 90% by weight of silicone oil, from 5 to 30% by weight of an alkali metal, ammonium or alkanolamine salt of an amino acid of 2 to 6 carbon atoms which has an acyl radical of a saturated or unsaturated fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl, and from not less than 5% by weight to the remainder to 100% by weight, of water, the emulsion being brought to pH 5-12, with an alkali metal hydroxide, ammonia or an alkanolamine, or (b) an anhydrous mixture of from 70 to 90% by weight of a silicone oil and from 10 to 30% by weight of an alkanolamine salt of an amino acid of 2 to 6 carbon atoms which has an acyl radical of a saturated or unsaturated fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl, in an amount of from 0.5 to 20% by weight, based on the shaved weight of the leather or wet weight of the skins, is allowed to act on the leather or skins being treated, in an aqueous liquor at pH 4.5-8.0, during or after retanning, after which the pH is brought to 3.0-5.0 and, if required, the leather or skins are after-treated in the aqueous solution with a divalent, trivalent or tetravalent metal salt conventionally used in tanning.
Claim 3
Dependent Claim
112 words
An emulsion for use in waterproofing leather and skins in an aqueous liquor during or after retanning, consisting of from 15 to 90% by weight of silicone oil, from 5 to 30% by weight of an alkali metal, ammonium or alkanolamine salt of an amino acid of 2 to 6 carbon atoms which has an acyl radical of a fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl, and from not less than 5% by weight to the remainder to 100% by weight of water, and the pH being brought to 5-12 with an alkali metal hydroxide, ammonia or an alkanolamine.
Claim 4
Dependent Claim
112 words
An emulsion for use in waterproofing leather and skins in an aqueous liquor during or after retanning, consisting of from 15 to 90% by weight of silicone oil, from 5 to 30% by weight of an alkali metal, ammonium or alkanolamine salt of an amino acid of 2 to 6 carbon atoms which has an acyl radical of a fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl, and from not less than 5% by weight to the remainder to 100% by weight of water, and the pH being brought to 5-12 with an alkali metal hydroxide, ammonia or an alkanolamine.
Claim 5
Dependent Claim
79 words
A mixutre for use in waterproofing leather or skins in an aqueous liquor during or after retanning, consisting of from 70 to 90% by weight of a silicone oil and from 10 to 30% by weight of an alkanolamine salt of an amino acid of 2 to 6 carbon atoms possessing an acyl radical of a saturated or unsaturated fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl.
Claim 6
Dependent Claim
79 words
A mixutre for use in waterproofing leather or skins in an aqueous liquor during or after retanning, consisting of from 70 to 90% by weight of a silicone oil and from 10 to 30% by weight of an alkanolamine salt of an amino acid of 2 to 6 carbon atoms possessing an acyl radical of a saturated or unsaturated fatty acid of 9 to 20 carbon atoms on the amine nitrogen atom, which may additionally be substituted by methyl.
Claim 7
Dependent Claim
62 words
Process of claim 1 wherein the silicone oil is a dimethylpolysiloxane, a phenylmethylpolysiloxane, a dimethlpolysiloxane possessing amino groups and having an amine number of about 0.8-1.0, a dimethylpolysiloxane possessing caboxyl groups having an average from 2 to 10 carboxyl groups per molecule, or a dimethylpolysiloxane in which from 1 to 5% of the methyl groups are replaced by mercaptopropyl or aminopropyl groups.
Claim 8
Dependent Claim
29 words
The process of claim 1 wherein the silicone oil is a dimethylpolysiloxane in which from 1 to 5% of the methyl groups are replaced by mercaptopropyl or aminopropyl groups.
Claim 9
Dependent Claim
63 words
The mixture of claim 3 wherein the silicone oil is a dimethylpolysiloxane, a plenylmethylpolysiloxane, a dimethylpolysiloxane possessing amino groups and having an amine number of about 0.8-1.0, a dimethylpolysiloxane possessing caboxyl groups having an average from 2 to 10 carboxyl groups per molecule, or a dimethylpolysiloxane in which from 1 to 5% of the methyl groups are replaced by mercaptopropyl or aminopropyl groups.
Claim 10
Dependent Claim
29 words
The mixture of claim 3 wherein the silicone oil is a dimethylpolysiloxane in which from 1 to 5% of the methyl groups are replaced by mercaptopropyl or aminopropyl groups.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |