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    • 22. 发明授权
    • Resistance welding of galvanized steel
    • 镀锌钢板电阻焊
    • US4889773A
    • 1989-12-26
    • US245483
    • 1988-11-07
    • Donald H. CampbellGerald L. Evarts
    • Donald H. CampbellGerald L. Evarts
    • B23K11/16B23K11/34B23K35/22
    • B23K11/34B23K35/226Y10T428/12049Y10T428/12056Y10T428/12063Y10T428/12139
    • A coating for improved resistance welding of galvanized steel parts or sheets comprises a binder, and a metal phosphide pigment, preferably a ferrophosphorus pigment, having a particle size of from about 0.1 to about 30 microns. The pigment can also include up to about 40% by weight of an additional metal such as tin, aluminum or lead, which can be combined with the metal phosphide in pigment form or deposited onto the surface of the particles. The coating can be applied to either the faying or non-faying surfaces of the galvanized steel, or to the resistance welding electrode, and may be removed, if desired, after the welding operation.The advantages of the present invention include a significant reduction in welding current and an increase in the weldability lobe width, a restoration of the dynamic resistance beta peak, and an increase in electrode life.
    • 用于改进镀锌钢部件或片材的电阻焊接的涂层包括粘合剂和具有约0.1至约30微米的粒度的金属磷化物颜料,优选磷酸铁颜料。 颜料还可以包括至多约40重量%的另外的金属如锡,铝或铅,其可以与颜料形式的金属磷化物结合或沉积在颗粒表面上。 涂层可以应用于镀锌钢板或电镀焊接电极的焊接表面或非焊接表面,如果需要,可以在焊接操作之后去除涂层。 本发明的优点包括焊接电流的显着降低和可焊接凸角宽度的增加,动态电阻β峰的恢复以及电极寿命的增加。
    • 25. 发明授权
    • Carbamate functional addition polymers and a method for their preparation
    • 氨基甲酸酯官能加成聚合物及其制备方法
    • US07179861B2
    • 2007-02-20
    • US10815327
    • 2004-04-01
    • Donald H. CampbellDonald L. St. AubinWalter H. Ohrbom
    • Donald H. CampbellDonald L. St. AubinWalter H. Ohrbom
    • C08F8/30
    • C09D201/025C08F222/20C08F222/22
    • A carbamate or terminal urea functional vinyl polymer is prepared by reacting a compound having an hydroxyl group and a carbamate group, terminal urea group, or a group that can be converted to a carbamate or terminal urea group, with a cyclic carboxylic acid anhydride group to form an ester bond and a free acid group from the anhydride; and reacting the free acid group with a compound having an epoxide group. The cyclic carboxylic acid anhydride group may be pendant to a vinyl polymer, or one of the compound having an hydroxyl group, a compound having the cyclic carboxylic acid anhydride group, and the compound having an epoxide group may have polymerizable ethylenic unsaturation that is polymerized, optionally with one or more copolymerizable monomers to form a vinyl polymer. When the compound having an hydroxyl group has a group that can be converted to a carbamate or terminal urea group, the group is converted to the carbamate or terminal urea group after step (a). The carbamate or terminal urea functional vinyl polymer may be included in a coating composition. The coating composition may be applied to a substrate and cured to form a cured coating on the substrate.
    • 通过将具有羟基和氨基甲酸酯基的化合物,末端脲基团或可转化为氨基甲酸酯或末端脲基团的化合物与环状羧酸酐基团反应制备氨基甲酸酯或末端脲官能乙烯基聚合物, 从酸酐形成酯键和游离酸基团; 并使游离酸基与具有环氧基的化合物反应。 环状羧酸酐基可以侧链至乙烯基聚合物,或具有羟基的化合物,具有环状羧酸酐基的化合物和具有环氧基的化合物之间可具有可聚合的烯属不饱和基团, 任选地与一种或多种可共聚单体形成乙烯基聚合物。 当具有羟基的化合物具有可以转化为氨基甲酸酯或末端脲基团的基团时,在步骤(a)之后将该基团转化为氨基甲酸酯或末端脲基团。 氨基甲酸酯或末端脲官能的乙烯基聚合物可以包括在涂料组合物中。 涂料组合物可以施加到基底上并固化以在基底上形成固化的涂层。