Leather oiling compositions and their use

• US 5,728,313 A
• Filed: 09/18/1996
• Issued: 03/17/1998
• Est. Priority Date: 02/18/1994
• Status: Expired due to Fees

• Current Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Original Assignee: Henkel Corporation (Henkel AG & Co KGaA)
• Inventors: Ruscheinsky, deceased, Emil, Zauns-Huber, Rudolf, Ortanderl, Stefanie, Ritter, Wolfgang
• Primary Examiner(s): GREEN, ANTHONY J
• Application Number:
  US08/693,072
• Time in Patent Office: 545 Days
• Field of Search: 252/8.57, 8/94.15, 8/94.18, 8/94.19 R, 8/94.22, 8/94.23, 8/94.1 R
• US Class Current: 252/8.57
• CPC Class Codes: C07C 233/47 having the carbon atom of the carboxamide group bound to a hydrogen atom or to a carbon atom of an acyclic saturated carbon skeleton
• CPC Class Codes: C07C 233/49 having the carbon atom of the carboxamide group bound to a carbon atom of an acyclic unsaturated carbon skeleton
• CPC Class Codes: C07C 69/76 Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C09K 23/00 Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
• CPC Class Codes: C09K 23/28 Aminocarboxylic acids proteins and protein hydrolysates C09K23/30
• CPC Class Codes: C14C 9/02 using fatty or oily materials, e.g. fat liquoring

Abstract

A method for oiling leather and skins by impregnating the leather and skins with partial esters of cyclic polycarboxylic acids or (partial) anhydrides with monofunctional fatty alcohols and optionally fixing the partial esters in the leather. Aqueous dispersions or emulsions of the cyclic polycarboxylic and/or (partial) anhydrides partial esters are also disclosed.

Claims

1. A method for oiling and optionally retanning a substrate comprising at least one member selected from the group consisting of leather and skins which comprises:

impregnating the substrate with an aqueous dispersion or emulsion comprising a partial ester formed by reaction of at least one member selected from the group consisting of cyclic polycarboxylic acids and (partial) anhydrides of cyclic polycarboxylic acids with monohydric fatty alcohols.

2. The method claimed in claim 1, wherein the partial esters are formed from at least one member selected from the .group consisting of tribasic cyclic polycarboxylic acids and tribasic cyclic polycarboxylic acid (partial) anhydrides having a ring system selected from the group consisting of a saturated ring, an olefinically unsaturated ring, and an aromatic ring.

3. The method claimed in claim 1 wherein the partial ester comprises a partial ester of an aromatic polycarboxylic acid containing 4 to 6 carboxylic groups on a C₆ ring system with monohydric fatty alcohols.

4. The method claimed in claim 1 wherein the partial ester comprises the partial ester of cyclic polycarboxylic acids formed by a Diels-Alder reaction of at least one member selected from the group consisting of monoolefinically unsaturated monocarboxylic acids, monoolefinically unsaturated polycarboxylic acids. monoolefinically unsaturated monocarboxylic acid anhydrides and monoolefinically unsaturated polycarboxylic acid (partial) anhydrides with conjugated diolefinically unsaturated compounds.

5. The method claimed in claim 4, wherein the partial esters comprise partial esters of the fatty alcohol with a reaction product of at least one of maleic acid and maleic anhydride with a diolefinically unsaturated monocarboxylic acid.

6. The method claimed in claim 1 wherein the partial esters comprise at least one alcohol group selected from the group consisting of saturated linear C₈ to C₄₀ alcohols, saturated branched C₈ -C₄₀ alcohols, unsaturated linear C₈ to C₄₀ alcohols, unsaturated branched C₈ to C₄₀ alcohols, reaction products of saturated linear C₈ to C₄₀ alcohols with lower hydroxycarboxylic acids, reaction products of unsaturated linear C₈ to C₄₀ alcohols with lower hydroxy carboxylic acids, reaction products of saturated branched C₈ to C₄₀ alcohols with lower hydroxy carboxylic acids, reaction products of unsaturated branched C₈ to C₄₀ alcohols with lower hydroxy carboxylic acids, reaction products of saturated linear C₈ to C₄₀ alcohols with lower alkylene oxides, reaction products of linear unsaturated C₈ to C₄₀ alcohols with lower alkylene oxides, reaction products of branched saturated C₈ to C₄₀ alcohols with lower alkylene oxides and reaction products of branched unsaturated C₈ to C₄₀ alcohols with lower alkylene oxides.

7. The method claimed in claim 1 wherein the partial esters comprise partial esters produced by a ring opening of a dicarboxylic anhydride ring with one equivalent of the monohydric fatty alcohol.

8. The method claimed in claim 1 wherein the aqueous dispersion or emulsion comprises the partial esters at a mildly acidic to a mildly alkaline pH value.

9. The method claimed in claim 1 wherein the substrate is impregnated with an emulsion comprising the partial ester and an emulsifier which emulsifier, on introduction into the substrate has an additional oiling effect and can be fixed in a tanned substrate by acidic groups.

11. The method as claimed in claim 3 wherein the partial ester comprises a partial ester of at least one member selected from the group consisting of pyromellitic acid, and (partial) anhydrides of pyromellitic acid.

12. The method of claim 4 wherein the conjugated diolefinically unsaturated compound contains at least one carboxyl function.

13. The method of claim 5 wherein the diolefinically unsaturated monocarboxylic acid is a conjuene fatty acid.

14. The method of claim 6 wherein the alcohol contains 12 to 24 carbon atoms.

10. The method claimed in 1 which further comprises fixing the partial ester impregnated into the substrate by an aftertreatment.

15. The method of claim 10 wherein the partial esters are fixed in the substrate by an aftertreatment of the substrate with a mineral tanning agent.

16. An aqueous dispersion comprising amphiphilic partial esters of at least one member selected from the group consisting of cyclic polycarboxylic acid and (partial) anhydrides of cyclic polycarboxylic acids with monohydric fatty alcohols which dispersion has a mildly acidic to mildly basic pH value and comprises a water-dilutable composition with an amphiphilic partial ester content of at least about 20% by weight.

17. The aqueous dispersion of the amphiphilic partial ester as claimed in claim 16, which additionally contains emulsifiers and optionally leather oiling compositions which contain an oleophilic hydrocarbon group containing at least 8 carbon atoms and at least one acid group.

18. The aqueous dispersion of the amphiphilic partial esters as claimed in claim 16 which contains at least one additional impregnating or hydrophobicizing leather oiling preparation comprising sulfosuccinic acid semiesters with C_12-24 fatty alcohol residues in combination with at least one compound selected from the group consisting of oxidized C_18-26 hydrocarbons, oxidized C_32-40 waxes, oxidized and partly sulfonated C_18-26 hydrocarbons oxidized and partly sulfonated C_32-40 waxes, phosphoric acid mono-C_12-24 -alkyl esters, partial esters of polycarboxylic acids, partial esters of polyalcohols, and C_18-24 fatty acid esters.

19. The aqueous dispersions of the amphiphilic partial esters as claimed in claim 16 wherein the amphiphilic partial esters make up at least about 35% by weight of impregnating and/or hydrophobicizing active substances in the aqueous dispersion.

20. The dispersion of claim 16 containing from 30% to 70% by weight of amphiphilic partial esters.

21. The aqueous dispersion of claim 17 wherein the oleophilic hydrocarbon group contains at least 10 carbon atoms.

22. The aqueous dispersion of claim 17 wherein the emulsifier comprises at least one member selected from the group consisting of sulfosuccinic acid semiesters of long-chain fatty alcohols with 12 to 24 carbon atoms, sulfosuccinic acid semiesters of alkylene oxide adducts of fatty alcohols with 12 to 24 carbon atoms and up to 6 alkylene oxide groups;

sulfosuccinic acid semiesters of C_12-24 fatty acid monoglycerides, sulfosuccinic fatty acid semiesters of alkoxylated C_12-24 fatty acid monoglycerides having up to 6 alkoxide groups, sulfosuccinic semiesters of C_12-24 fatty acid diglycerides, sulfosuccinic acid semiesters of alkoxylated C_12-24 fatty acid diglycerides having up to 6 alkoxide groups, C_12-24 α

-sulfofatty acids, internal sulfonates of monoolefinically unsaturated C_12-24 fatty acids, internal sulfonates of polyolefinically unsaturated C_12-24 fatty acids, and salts of a C_2-6 amino acid substituted by an acyl group of a C_9-20 fatty acid at an amine nitrogen of the amino acid which may optionally be methyl substituted at the amine nitrogen.