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    TANNING PROCESS FOR OBTAINING LEATHER
    1.
    发明申请
    TANNING PROCESS FOR OBTAINING LEATHER 审中-公开
    用于获取皮革的TANNING工艺

    公开(公告)号：US20160244854A1

    公开(公告)日：2016-08-25

    申请号：US15025854

    申请日：2014-09-30

    Applicant: RHODIA POLIAMIDA E ESPECIALIDADES LTDA

    Inventor： Wagner Celio Ferraz Lourenco

    IPC: C14C3/06 ,  C14C1/08

    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.

    Abstract translation: 本发明涉及一种鞣制皮革以获得皮革的方法。 获得中间湿蓝色阶段的一般方法包括以下步骤：a）用酸和盐进行采摘步骤，然后b）用铬盐进行鞣制步骤，然后c）碱化步骤。 本发明的特征在于，酸洗步骤的浴包括选自2-甲基戊二酸（MGA），乙基琥珀酸（ESA）和其混合物的有机酸，而不是传统的强酸，通常是硫酸。该方法需要较少的碱化 代理商，并增加了鞣制产品的上涨。 本发明提供具有改进的机械性能的皮革。

    CHROME TANNING PROCESS
    3.
    发明申请
    CHROME TANNING PROCESS 审中-公开
    铬染色工艺

    公开(公告)号：US20160244853A1

    公开(公告)日：2016-08-25

    申请号：US15025853

    申请日：2014-09-30

    Applicant: RHODIA POLIAMIDA E ESPECIALIDADES LTDA

    Inventor： Wagner Célio Ferraz LOURENÇO

    IPC: C14C3/06 ,  C14C1/08

    CPC classification number: C14C3/06 ,  C14C1/08

    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.

    Abstract translation: 本发明涉及一种鞣制皮革以获得皮革的方法。 获得中间湿蓝色阶段的一般方法包括以下步骤：a）用酸和盐进行采摘步骤，然后b）用铬盐进行鞣制步骤，然后c）碱化步骤。 本发明的特征在于在步骤b）和c）之间，加入有机酸的再酸化步骤。 特别地，有机酸选自戊二酸（GA），2-甲基戊二酸（MGA），琥珀酸，乙基琥珀酸（ESA），己二酸（AA），马来酸酐，富马酸酐，三羧酸，羟基羧酸 ，及其混合物。 本发明能够增加鞣制产品的上升，并提供具有改进的机械性能的皮革。

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