Patent ID: 7632386
Filing Date: 2009-12-15
Classification: C09D,C25D

Abstract:
1. A process for producing a coating, said process comprising the sequential steps of: a) cathodically electrodepositing a cathodic electrodeposition (CED) coating composition on a conductive substrate by immersing the substrate in a CED coating bath to form a CED coating film; b) rinsing the CED coating film with (i) ultrafiltrate and subsequently with water or (ii) water, to remove excess and/or non-adhering CED coating composition; c) contacting the CED coating film with an aqueous preparation of at least one bismuth compound; and d) thermally crosslinking the CED coating film; wherein the aqueous preparation of part (c) consists essentially of water, 50 to 100,000 ppm of bismuth compound, and optionally 5% by weight of additives, and wherein the at least one bismuth compound is a bismuth salt selected from the group consisting of nitric acid salts of bismuth, acetic acid salts of bismuth, methoxy acetic acid salts of bismuth, amino carboxylic acid salts of bismuth, hydroxy carboxylic acid salts of bismuth and sulphonic acid salts of bismuth.