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    Method for forming a multilayer coating film
    3.
    发明专利
    Method for forming a multilayer coating film 有权

    公开(公告)号：JP5321208B2

    公开(公告)日：2013-10-23

    申请号：JP2009095055

    申请日：2009-04-09

    申请人： トヨタ自動車株式会社

    发明人： 淳也 小川

    IPC分类号： B05D1/36

    摘要： PROBLEM TO BE SOLVED: To provide an yellowing suppression method applicable to a multilayer coating film forming method using various aqueous coating materials. SOLUTION: The method of forming a multilayer coating film, including at least an intermediate coating film formed on an object to be coated, a base coating film formed on the intermediate coating film, and a clear coating film formed on the base coating film, includes: a process of applying a base coating material on the intermediate coating film and forming a non-hardened base coating film; a process of preheating the non-hardened base coating film under time and temperature conditions for which the time t (minutes) and the temperature A (°C) satisfy 3≤t≤20 and -40/17(t-54)≤A≤140 or 20 COPYRIGHT: (C)2011,JPO&INPIT

    Method for forming a multilayer coating film
    8.
    发明专利
    Method for forming a multilayer coating film 有权

    公开(公告)号：JP5342457B2

    公开(公告)日：2013-11-13

    申请号：JP2009547113

    申请日：2008-12-24

    申请人： 日本ペイント株式会社 ,  トヨタ自動車株式会社

    发明人： 英顕 辻岡 ,  淳之 島田 ,  久記 田辺 ,  淳也 小川

    IPC分类号： B05D1/36 ,  B05D5/06

    CPC分类号： C09D133/066 ,  B05D7/532 ,  B05D7/534 ,  C08G18/6254 ,  C08G18/792 ,  C09D133/08 ,  C09D175/04 ,  C08L2666/02

    摘要： Disclosed is a double-layer coating film formation method that includes a step (1) wherein a base coating is applied to a substrate to form an uncured base coating film, a step (2) wherein a clear coating is applied on the uncured base coating film obtained in the aforementioned step (1) to form an uncured clear coating film, and a step (3) wherein the uncured base coating film and uncured clear coating film obtained in the aforementioned step (1) and step (2) are heat cured to form a double-layer coating film. This double-layer coating film formation method is characterized by (a) the L value of the aforementioned uncured base coating film being 70 to 105 in 25° reflection and 20 to 50 in 75° reflection, (b) the value of &Dgr;L, found by subtracting the L value for the aforementioned uncured base coating film from the L value of the aforementioned double-layer coating film at 25° reflection, being -0.3 to 0.15, and (c) the value of &Dgr;L, found by subtracting the L value of the aforementioned uncured base coating film from the L value of the aforementioned double-layer coating film at 75° reflection, being -0.2 to 0.4. Also, the aforementioned clear coating is a clear coating compound that contains: an acrylic resin, which is obtained from a monomer mixture containing 10 to 15% by mass long-chain (meth)acrylic acid ester monomer, in which the ester portion is a straight-chain hydrocarbon group of 9 to 15 carbon atoms, relative to the total quantity of monomer solids, a carboxy group-containing (meth)acrylic monomer, and a hydroxy group-containing (meth)acrylic monomer, the number-average molecular weight of which being 4000 to 6000 and the solids acid number of which being 1 to 5 mg KOH/g; a polyisocyanate compound; and cross-linked resin particles. The double-layer coating film formation method makes possible the formation of a double-layer coating film of superior design, acid resistance, and scratch resistance.