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Found results for
 patents
1.
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Chrome tanning process
| Application Number |
15025853 |
| Grant Number |
10844445 |
| Status |
In Force |
| Filing Date |
2014-09-30 |
| First Publication Date |
2016-08-25 |
| Grant Date |
2020-11-24 |
| Owner |
TECHPOLYMERS INDUSTRIA E COMERCIO Ltda (Brazil)
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| Inventor |
Lourenço, Wagner Célio Ferraz
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Abstract
The invention concerns a process for tanning hide to obtain leather. The general process for obtaining the intermediary wet blue stage comprises the following steps: a) a picking step with acid and salt, followed by b) a tanning step with chromium salt, followed by c) a basification step. The invention is characterized in that between step b) and c), a re-acidification step with organic acids is added. In particular the organic acids are selected from glutaric acid (GA), 2-methyl glutaric acid (MGA), succinic acid, ethyl succinic acid (ESA), adipic acid (AA), maleic anhydride, fumaric anhydride, tricarboxylic acids, hydroxycarboxylic acids, and mixture thereof. This invention enables an increase of the up-taking of the re-tanning products and provides leather with improved mechanical properties.
IPC Classes ?
- C14C 3/06 - Mineral tanning using chromium compounds
- C14C 1/08 - DelimingBatingPicklingDegreasing
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2.
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Tanning process for obtaining leather
| Application Number |
15025854 |
| Grant Number |
10731230 |
| Status |
In Force |
| Filing Date |
2014-09-30 |
| First Publication Date |
2016-08-25 |
| Grant Date |
2020-08-04 |
| Owner |
TECHPOLYMERS INDUSTRIA E COMERCIO Ltda (Brazil)
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| Inventor |
Lourenço, Wagner Célio Ferraz
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Abstract
The invention concerns a process for tanning hide to obtain leather. The general process for obtaining the intermediary wet blue stage comprises the following steps: a) a picking step with acid and salt, followed by b) a tanning step with chromium salt, followed by c) a basification step. The invention is characterized in that the bath of the pickling step comprises organic acids selected from 2-Methyl glutaric acid (MGA), ethyl succinic acid (ESA) and mixture thereof instead of the traditional strong acid, generally sulfuric acid This process requires less basification agent and enables an increase of the up-taking of the re-tanning products. This invention provides leather with improved mechanical properties.
IPC Classes ?
- C14C 3/06 - Mineral tanning using chromium compounds
- C14C 1/08 - DelimingBatingPicklingDegreasing
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3.
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Use of polyamide for the preparation of injection-molded articles and resulting articles
| Application Number |
13635270 |
| Grant Number |
09919461 |
| Status |
In Force |
| Filing Date |
2011-03-22 |
| First Publication Date |
2013-08-01 |
| Grant Date |
2018-03-20 |
| Owner |
TECHPOLYMERS INDUSTRIA E COMERCIO LTDA (Brazil)
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| Inventor |
- Perez Gesteira, Gisela
- Chaubet, Olivier
- Canova, Thomas
- Medeiros, Guainumbi
- Kupidlowski, Suzana
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Abstract
The use of thermoplastic polymers for the preparation of injection-molded articles and the resulting articles are described. Also described, is the use of a lubricated polyamide, obtained by means of the addition of at least one lubricant during the polyamide polymerization method, for the preparation of injection-molded articles.
IPC Classes ?
- B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
- B29B 9/12 - Making granules characterised by structure or composition
- C08G 69/16 - Preparatory processes
- C08G 69/28 - Preparatory processes
- C08J 3/20 - Compounding polymers with additives, e.g. colouring
- C08L 77/02 - Polyamides derived from omega-amino carboxylic acids or from lactams thereof
- C08L 77/06 - Polyamides derived from polyamines and polycarboxylic acids
- C08K 5/00 - Use of organic ingredients
- B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material
- C08K 5/01 - Hydrocarbons
- C08K 5/09 - Carboxylic acidsMetal salts thereofAnhydrides thereof
- C08K 5/098 - Metal salts of carboxylic acids
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4.
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Process for preparing a lubricated thermoplastic polymer
| Application Number |
13140916 |
| Grant Number |
08853310 |
| Status |
In Force |
| Filing Date |
2009-12-11 |
| First Publication Date |
2011-12-29 |
| Grant Date |
2014-10-07 |
| Owner |
TECHPOLYMERS INDUSTRIA E COMERCIO LTDA (Brazil)
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| Inventor |
- Gesteira, Giseal Perez
- Silva, Antonio Cesar
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Abstract
A method for preparing a lubricated thermoplastic polymer, in particular a lubricated polyamide is described. A method for preparing a lubricated thermoplastic polymer, in particular a lubricated polyamide, according to which a mixture of lubricants is added to the molten polymer during the polymerization process is also described.
IPC Classes ?
- C08K 5/09 - Carboxylic acidsMetal salts thereofAnhydrides thereof
- C04B 35/634 - Polymers
- C08K 5/01 - Hydrocarbons
- C08K 5/098 - Metal salts of carboxylic acids
- C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G 69/28 - Preparatory processes
- C10M 169/04 - Mixtures of base-materials and additives
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