Patent US4762522A successfully refreshed from Google Patents.
US4762522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agent for treatment of hides and pelts
Assignee: GAF Chemicals Corp
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Filing: 1987-03-02
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Granted: 1988-08-09
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Expires: 2007-03-02
Abstract
Abstract A hide or pelt processing agent suitable for use in leather treating compositions comprising a N-alkyl-heterocyclic amide having C 6 to C 18 alkyl substitution on the hetero-nitrogen atom; such as, for example N-octyl-2-pyrrolidone, N-dodecyl-2-pyrrolidone, N-cocoalkyl-2-pyrrolidone and N-tallowalkyl-2-pyrrolidone, employed in an amount between about 0.01 and about 20% by weight based on the total composition of a standard leather treating solution, suspension or emulsion. The present composition containing one or more of the N-heterocyclic amides can be applied in various curing, tanning and finishing stages of leather treatment to produce processed hides and pelts of improved dyeability, flexibility and moisture content. The present amides can be used directly as an adjuvant in existing formulations to hasten curing and tanning, as an aqueous hydrating solution following beaming, as a sharpening agent in a lime bath for removal of epidermis and hair, as a post-tanning wash solution to prevent curling and minimize shrinkage and, in finishing operations, as a softening, moisturizing and penetrating agent or as an additive to conventional finishing solutions, including bleaching, scouring, fat-liquoring, oiling and/or stuffing solutions, dispersions or emulsions. The present composition is also useful as a dye or pigment carrier to provide improved uniformity and depth of shade in the dyed leather product.
Inventors
- 👤 Marilyn J. Maue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:30
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/30; C; C14; C14C; C14C1/00; C14C3/00; C14C9/00; D06P3/32
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
41 words
A leather processing composition containing an effective leather penetrating amount of an N-heterocyclic amide having the formula ##STR2## wherein n has a value of 1 to 3 and R is an aliphatic hydrocarbon radical of from 6 to 18 carbon atoms.
Claim 2
Dependent Claim
41 words
A leather processing composition containing an effective leather penetrating amount of an N-heterocyclic amide having the formula ##STR2## wherein n has a value of 1 to 3 and R is an aliphatic hydrocarbon radical of from 6 to 18 carbon atoms.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein R is selected from the group of C 6 to C 18 alkyl, tallowalkyl, cocoalkyl and mixtures thereof.
Claim 4
Dependent Claim
15 words
The composition of claim 2 wherein said N-heterocyclic amide is N-cocoalkyl-2-pyrrolidone, N-tallowalkyl-2-pyrrolidone or mixtures thereof.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein said composition is an aqueous composition.
Claim 6
Dependent Claim
40 words
The composition of claim 1 wherein the N-heterocyclic amide is contained in an inert carrier and wherein the effective amount of said N-heterocyclic amide is between about 0.01 wt. % and about 20 wt. % based on weight of hide.
Claim 7
Dependent Claim
11 words
The composition of claim 5 wherein said inert carrier is water.
Claim 8
Dependent Claim
58 words
The composition of claim 1 wherein said composition contains an emulsifier mixture of from about 2 to about 25 weight percent of a fatty acid and from about 0.1 to about 5 weight percent of a base selected from the group consisting of triethanol amine, an alkali metal lactate, ammonia and an alkali metal borate and mixtures thereof.
Claim 9
Dependent Claim
41 words
The composition of claim 1 wherein said composition additionally contains between about 0.5 and about 15 weight percent of a fatty acid ester surfactant selected from the group consisting of isopropyl myristate, myristyl myristate, lauryl lactate, glycerol monostearate and mixtures thereof.
Claim 10
Dependent Claim
39 words
The composition of claim 1 wherein said composition additionally contains between about 0.5 and about 12 weight percent of a humectant selected from the group consisting of propylene glycol, ethylene glycol, a polyoxyalkylene glycol, polyalkylene glycol, sorbitol and glycerine.
Claim 11
Dependent Claim
20 words
The process of utilizing an effective hide penetrating amount of the compound of claim 1 as a leather processing aid.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein said compound is an N-alkyl-2-pyrrolidone, N-cocoalkyl-2-pyrrolidone or N-tallowalkyl-2-pyrrolidone or a mixture thereof.
Claim 13
Dependent Claim
23 words
The process of claim 10 wherein the amount of said compound employed is between about 0.01 and about 20% per weight of hide.
Claim 14
Dependent Claim
22 words
The process of claim 12 wherein the amount of said compound is between about 0.05 and about 10% per weight of hide.
Claim 15
Dependent Claim
22 words
The process of claim 10 utilizing said compound in fat-liquoring bath at a temperature of from about 100° to about 150° F.
Claim 16
Dependent Claim
27 words
The process of claim 10 utilizing said compound as an additive to the leather tanning bath at a temperature of from about 75° to about 125° F.
Claim 17
Dependent Claim
15 words
The process of claim 15 wherein the tanning bath contains a chromium salt tanning agent.
Claim 18
Dependent Claim
15 words
The process of claim 15 wherein the tanning bath contains a vegetable extract tanning agent.
Claim 19
Dependent Claim
14 words
The process of claim 15 wherein the tanning bath contains a syntan tanning agent.
Claim 20
Dependent Claim
20 words
The process of claim 10 wherein said compound is added to a saturated salt solution used in curing of hides.
Claim 21
Dependent Claim
18 words
The process of claim 10 wherein said compound is added to a dyeing solution applied to a hide.
Claim 22
Dependent Claim
19 words
The process of claim 10 wherein said compound is added to a leather bleaching solution applied to a hide.
Claim 23
Dependent Claim
15 words
The process of claim 10 wherein said compound is added to a leather defleshing bath.
Claim 24
Dependent Claim
17 words
The process of claim 10 wherein said compound is added to a leather post tanning washing solution.
Claim 25
Dependent Claim
23 words
The process of using an effective hide softening amount of the compound of claim 1 in at least one stage of leather processing.
Claim 26
Dependent Claim
20 words
The process of using an effective viscosity building amount of the compound of claim 1 in a leather processing treatment.
Claim 27
Dependent Claim
19 words
The process of using an effective lubricating amount of the compound of claim 1 in a leather oiling treatment.
Claim 28
Dependent Claim
19 words
The process using an effective dispersion promoting amount of the compound of claim 1 in a leather coating composition.
References Cited (Backward Citations)
US3345203A
Cited
GB1481508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |