US4345006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating leather
Assignee: Roehm GmbH Darmstadt
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Filing: 1981-08-14
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Granted: 1982-08-17
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Expires: 2001-08-14
Abstract
Abstract What are disclosed are methods for treating tanned leather with a dispersion of an acrylate resin comprising certain acrylate and/or methacrylate esters, an hydroxyalkyl acrylate or methacrylate, an unsaturated polymerizable anionic compound such as an unsaturated carboxylic acid, a crosslinking monomer, and, optionally, acrylamide or methacrylamide, as well as the leathers produced by these methods.
Inventors
- 👤 Hans-Peter Loechel
- 👤 Tom Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:39
CPC Classifications
C; C14; C14C; C14C11/00; C14C11/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
A method for treating tanned leather which comprises contacting the leather with a dispersed acrylate resin comprising 60-85 parts by weight of at least one member selected from the group consisting of esters of acrylic acid and esters of methacrylic acid, the homopolymers or copolymers of which esters have a glass transition temperature less than 0° C.; 10-20 parts by weight of at least one hydroxyalkyl acrylate or methacrylate of the formula ##STR2## wherein R is hydrogen or methyl, R 1 is hydrogen or alkyl having 1 to 2 carbon atoms, and n is an integer from 2 to 8, - 10parts by weight of an α,β-monounsaturated monobasic or dibasic carboxylic acid having 3 to 5 carbon atoms or of a water soluble salt of such an acid; 0.2-2.5 parts by weight of a crosslinking monomer; and 0-2.5 parts by weight of acrylamide or methacrylamide.
Claim 2
Independent Claim
145 words
A method for treating tanned leather which comprises contacting the leather with a dispersed acrylate resin comprising 60-85 parts by weight of at least one member selected from the group consisting of esters of acrylic acid and esters of methacrylic acid, the homopolymers or copolymers of which esters have a glass transition temperature less than 0° C.; 10-20 parts by weight of at least one hydroxyalkyl acrylate or methacrylate of the formula ##STR2## wherein R is hydrogen or methyl, R 1 is hydrogen or alkyl having 1 to 2 carbon atoms, and n is an integer from 2 to 8, - 10parts by weight of an α,β-monounsaturated monobasic or dibasic carboxylic acid having 3 to 5 carbon atoms or of a water soluble salt of such an acid; 0.2-2.5 parts by weight of a crosslinking monomer; and 0-2.5 parts by weight of acrylamide or methacrylamide.
Claim 3
Dependent Claim
12 words
A method as in claim 1 wherein said resin comprises ethyl acrylate.
Claim 4
Dependent Claim
38 words
A method as in claim 1 wherein said resin comprises a member selected from the group consisting of itaconic acid, maleic acid, fumaric acid, crotonic acid, acrylic acid, methacrylic acid, and the water soluble salts of these acids.
Claim 5
Dependent Claim
12 words
A method as in claim 3 wherein said member is dipotassium itaconate.
Claim 6
Dependent Claim
11 words
A treated tanned leather made by the method of claim 1.
Claim 7
Dependent Claim
11 words
A treated tanned leather made by the method of claim 2.
Claim 8
Dependent Claim
11 words
A treated tanned leather made by the method of claim 3.
Claim 9
Dependent Claim
11 words
A treated tanned leather made by the method of claim 4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |