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    Process for removing a coating from a substrate
    3.
    发明授权
    Process for removing a coating from a substrate 失效
    从基材去除涂层的方法

    公开(公告)号：US07229953B1

    公开(公告)日：2007-06-12

    申请号：US11257937

    申请日：2005-10-25

    Applicant: Vinod S. Agarwala ,  Prithviraj Pole ,  Krishnan Rajeshwar

    Inventor： Vinod S. Agarwala ,  Prithviraj Pole ,  Krishnan Rajeshwar

    IPC: C11D9/00 ,  C09D9/00

    CPC classification number: C09D9/00

    Abstract: A process of stripping a coating according to the invention comprises subjecting a coated substrate to an aqueous medium containing a peroxide and an interfacial mixing agent, and to heating preferably by either ultraviolet (UV) and/or infrared (IR) radiation. The substrate is completely stripped of the coating and suffers no damage to itself as a result of the paint debonding/dislodging process. No toxic wastes are generated from this process, nor are particulates associated with air pollution generated. The metal substrates being stripped also do not undergo corrosion or other damage as a result of the described process.

    Abstract translation: 根据本发明的剥离涂层的方法包括将涂覆的基材经受含有过氧化物和界面混合剂的水性介质，并优选通过紫外（UV）和/或红外（IR）辐射进行加热。 基材完全剥离涂层，并且由于涂料脱粘/脱落过程而不会对其自身造成损坏。 该过程不产生有毒废物，也不产生与空气污染有关的颗粒物。 剥离的金属基材也不会因所述方法而遭受腐蚀或其它损坏。

    Conducting polymer films containing nanodispersed catalyst particles: a new type of composite material for technological applications
    4.
    发明授权
    Conducting polymer films containing nanodispersed catalyst particles: a new type of composite material for technological applications 失效

    公开(公告)号：US5334292A

    公开(公告)日：1994-08-02

    申请号：US931212

    申请日：1992-08-17

    Applicant: Krishnan Rajeshwar ,  Chalasani S. C. Bose

    Inventor： Krishnan Rajeshwar ,  Chalasani S. C. Bose

    IPC: B01J31/06 ,  B01J35/00 ,  B01J37/34 ,  C08G61/12 ,  C08K3/08 ,  C25D15/00 ,  H01B1/12 ,  H01M4/88 ,  H01M4/92 ,  C25B3/00

    CPC classification number: B01J35/0013 ,  B01J31/06 ,  B01J35/0033 ,  B01J37/342 ,  C08G61/124 ,  C08K3/08 ,  C25D15/00 ,  H01B1/127 ,  H01M4/8668 ,  H01M4/8853 ,  H01M4/92

    Abstract: The present invention concerns an electronically conductive polymer film comprising colloidal catalytic particles homogeneously dispersed therein. The electronically conductive polymer is preferably polypyrrole although other conductive polymers, for example, polyaniline and polythiophene are also utilizable. The preferred catalytic particles are platinum although other catalytic particles such as RuO.sub.2, Ag, Pd, Ni, Cd, Co, Mo, Mn-oxide, Mn-sulfide, a molybdate, a tungstate, tungsten carbide, a thiospinel, Ru, Rh, Os, It, or a platinum palladium alloy (Pt/Pd).The colloidal catalytic particles incorporated in the film of the present invention are less than 100 nanometers in size, preferably about 10 nm in size. In a most preferred composition, the polymer is polypyrrole and the catalytic particles are platinum.The present invention also involves a method of producing an electronically conductive polymer film containing colloidal catalytic particles homogeneously dispersed therein. This method comprises: 1) preparing a colloidal suspension of catalytic particles in a solution comprising an electronically conductive polymer precursor. The catalytic particles may be those listed above, preferably platinum, and the electronically conductive polymer precursor is preferably pyrrole although aniline and thiophene or other monomers leading to conductive polymers may also be utilized analogously. An electronically conductive polymer film is then electrosynthesized, incorporating homogeneously dispersed colloidal catalytic particles.In an important embodiment of the present invention, colloidal platinum particles are produced by citrate reduction of Pt (IV) to Pt.sup.0. Most preferably, this citrate reduction involves a sub-stoichiometric level of citrate as compared to the Pt (IV) level.Another important aspect of the present invention is the utilization of the porous conductive polymeric matrix of the present invention which includes homogeneously dispersed colloidal catalytic particles to catalyze a reaction. Such a catalytic reaction involves subjection of reactants to this material in an electrochemically conductive or other context. Advantages of this type of catalysis involves ready retrieval of the catalytic particles, efficient utilization of expensive catalytic particles such as platinum, resistance of the particles to at least high molecular weight poisons which will not penetrate the polymeric matrix and, finally, the lack of saturation of catalytic activity in contrast to that seen with surface coated thin polymer layers.

    Process for removing a coating from a substrate
    5.
    发明申请
    Process for removing a coating from a substrate 审中-公开
    从基材去除涂层的方法

    公开(公告)号：US20100018952A1

    公开(公告)日：2010-01-28

    申请号：US11811107

    申请日：2007-06-08

    Applicant: Vinod S. Agarwala ,  Prithviraj Pole ,  Krishnan Rajeshwar

    Inventor： Vinod S. Agarwala ,  Prithviraj Pole ,  Krishnan Rajeshwar

    IPC: B44C1/22 ,  C23F1/08 ,  C09K13/00

    CPC classification number: C09D9/00

    Abstract: A process of stripping a coating according to the invention comprises subjecting a coated substrate to an aqueous medium containing a peroxide and an interfacial mixing agent, and to heating preferably by either ultraviolet (UV) and/or infrared (IR) radiation. The substrate is completely stripped of the coating and suffers no damage to itself as a result of the paint debonding/dislodging process. No toxic wastes are generated from this process, nor are particulates associated with air pollution generated. The metal substrates being stripped also do not undergo corrosion or other damage as a result of the described process.

    Abstract translation: 根据本发明的剥离涂层的方法包括将涂覆的基材经受含有过氧化物和界面混合剂的水性介质，并优选通过紫外（UV）和/或红外（IR）辐射进行加热。 基材完全剥离涂层，并且由于涂料脱粘/脱落过程而不会对其自身造成损坏。 该过程不产生有毒废物，也不产生与空气污染有关的颗粒物。 剥离的金属基材也不会因所述方法而遭受腐蚀或其它损坏。

    Redox polymer films for metal recovery applications
    6.
    发明授权
    Redox polymer films for metal recovery applications 失效
    用于金属回收应用的氧化还原聚合物膜

    公开(公告)号：US5368632A

    公开(公告)日：1994-11-29

    申请号：US43517

    申请日：1993-04-06

    Applicant: Krishnan Rajeshwar ,  Chang Wei ,  Sanjay Basak

    Inventor： Krishnan Rajeshwar ,  Chang Wei ,  Sanjay Basak

    IPC: C02F1/70 ,  C02F9/00 ,  C22B3/24

    CPC classification number: C02F9/00 ,  C02F1/70 ,  C02F2101/20 ,  Y10S423/14

    Abstract: The treatment of solutions of metal ions with redox polymers under conditions to reduce the ions to a lower valence. The resulting solutions of the lower valence ions are separated from the polymers, and the polymers are regenerated for further use in such treatment. The method of the invention is employed to convert high valence, toxic metal ions to lower valence ions of reduced toxicity. Preferably, the electronically conductive polymer is mounted on a suitable support, and a solution of the toxic metal ion is brought into contact with the polymer. A variety of redox polymers, in particular, electronically conductive polymers, may be used in the practice of the invention, and individual such polymers may be structurally altered to suit particular metal ions. Polymers especially contemplated for use in the invention are polypyrroles, polyanilines and polythiophenes. All of these polymers are characterized as redox polymers with a positive charge on their backbones. In general, suitable polymers are redox polymers bearing a positive charge on their backbones with an E.sub.o of the (surface) redox couple sufficiently negative to react with a metal ion of interest. Thus, for example, an E.sub.o more negative than 1.16V is preferred for the recovery of Cr(VI).

    Abstract translation: 在氧化还原聚合物的条件下处理金属离子溶液以将离子降低至较低的价态。 所得到的低价离子的溶液与聚合物分离，聚合物再生再进一步用于这种处理。 本发明的方法用于将高价，有毒金属离子转化为毒性降低的低价离子。 优选地，将电子导电聚合物安装在合适的载体上，使有毒金属离子的溶液与聚合物接触。 各种氧化还原聚合物，特别是电子导电聚合物，可用于本发明的实践中，并且各种这样的聚合物可在结构上改变以适合特定的金属离子。 聚苯乙烯，聚苯胺，聚噻吩等。 所有这些聚合物都表征为在其主链上具有正电荷的氧化还原聚合物。 通常，合适的聚合物是在其主链上带有正电荷的氧化还原聚合物，其中（表面）氧化还原对的Eo足够负，以与感兴趣的金属离子反应。 因此，例如，对于Cr（VI）的回收率，优选比1.16V更负的Eo。

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