Tanning agents can be prepared by reacting at least one aldehyde of formula I, with at least one further identical or different aldehyde of formula I, where Z is a single chemical bond, unsubstituted or substituted C1-C12-alkylene, unsubstituted or substituted C5-C12-cycloalkylene or unsubstitu
Tanning agents can be prepared by reacting at least one aldehyde of formula I, with at least one further identical or different aldehyde of formula I, where Z is a single chemical bond, unsubstituted or substituted C1-C12-alkylene, unsubstituted or substituted C5-C12-cycloalkylene or unsubstituted or substituted C6-C14-arylene, the reaction being carried out in the presence of an acidic catalyst and in the presence of at least one further carbonyl compound of formula II where R1 to R4, independently of one another, are hydrogen, unsubstituted or substituted C1-C12-alkyl, unsubstituted or substituted C3-C12-cycloalkyl, unsubstituted or substituted C7-C13-aralkyl or unsubstituted or substituted C6-C14-aryl, with the proviso that, where Z is a single chemical bond or a radical without a-hydrogen atoms, at least one further aldehyde of the formula I, in which Z contains α-hydrogen atoms, or at least one further carbonyl compound of formula II is present.
대표청구항▼
The invention claimed is: 1. A process for pretanning, tanning or retanning an animal hide, comprising: obtaining a tanning agent prepared by reacting at least one aldehyde according to formula (I) where Z is an unsubstituted or substituted C1-C12-alkylene, unsubstituted or substituted C5-C12-c
The invention claimed is: 1. A process for pretanning, tanning or retanning an animal hide, comprising: obtaining a tanning agent prepared by reacting at least one aldehyde according to formula (I) where Z is an unsubstituted or substituted C1-C12-alkylene, unsubstituted or substituted C5-C12-cycloalkylene or unsubstituted or substituted C6-C14-arylene, with at least one further identical or different aldehyde according to formula (I), the reaction being carried out in the presence of an acidic catalyst and at least one further carbonyl compound according to formula (II) where each of R1 to R4, independently of one another, is hydrogen, unsubstituted C1-C12-alkyl, unsubstituted C3-C12-cycloalkyl, unsubstituted or substituted C7-C13-aralkyl or unsubstituted or substituted C6-C14-aryl; and applying the obtained tanning agent to the animal hide. 2. The process according to claim 1, wherein the further carbonyl compound of the formula (II) has α-hydrogen atoms. 3. The process according to claim 1, wherein the further carbonyl compound is a compound according to formula (IIa): wherein R1 to R3 are as defined in formula (II). 4. The process according to claim 1, wherein R3 in formula (II) is methyl. 5. The process according to claim 1, wherein the tanning agent is in the form of a pulverulent active ingredient. 6. The process according to claim 5, wherein the pulverulent active ingredient comprises from 10 to 100% by weight of the tanning agent in solid form and from 0 to 90% by weight of at least one additive. 7. The process according to claim 6, wherein at least one additive comprises at least one member selected from the group consisting of starch, silica, alumina, mixed oxides of silicon and aluminum. 8. The process according to claim 5, wherein the pulverulent active ingredient is obtained by spray-drying. 9. The process according to claim 1, wherein the tanning agent comprises an oligomer or a polymer including the aldehyde of formula (I) and an identical aldehyde of formula (I). 10. The process according to claim 1, wherein the tanning agent comprises a dimer including the aldehyde of formula (I) and an identical aldehyde of formula (I). 11. The process according to claim 1, where Z is--(CH2)3--in formula (I). 12. The process according to claim 1, where R1 to R4 in formula (II), independently of one another, are hydrogen, C1-C12-alkyl, C3-C12-cycloalkyl, C7-C13-aralkyl or C6-C14-aryl. 13. The process according to claim 1, wherein R1 and R2 in formula (II) are each hydrogen. 14. The process according to claim 1, wherein the acid catalyst is selected from the group consisting of phosphoric acid, formic acid, acetic acid, acidic silica gel, dilute sulfuric acid, and concentrated sulfuric acid.
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이 특허에 인용된 특허 (1)
Pilosof David (Cincinnati OH) Cappel Jerome P. (Cincinnati OH) Geis Philip A. (West Chester OH) McCarty Mark Lee (Loveland OH) Trinh Toan (Maineville OH) Zwerdling Susan S. (Wyoming OH), Fabric treating composition containing beta-cyclodextrin and essentially free of perfume.
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