Title:
MULTI-STAGE PROCESSES FOR COATING SUBSTRATES WITH LIQUID BASECOAT AND POWDER TOPCOAT
Document Type and Number:
WIPO Patent Application WO2000072978
Kind Code:
A3
Abstract:
Processes for coating metal or polymeric substrates are provided which include the steps of: (a) applying a liquid basecoating composition to a surface of the substrate; (b) exposing the basecoating composition to air having a temperature ranging from about 10 DEG C to about 50 DEG C for a period of at least about 5 minutes to volatilize at least a portion of volatile material from the liquid basecoating composition, the velocity of the air at a surface of the basecoating composition being less than about 0.5 meters per second; (c) applying infrared radiation and hot air simultaneously to the basecoating composition for a period of at least about 2 minutes, the velocity of the air at the surface of the basecoating composition being less than about 4 meters per second, the temperature of the metal substrate being increased at a rate ranging from about 0.4 DEG C per second to about 1.2 DEG C per second to achieve a peak substrate temperature ranging from about 120 DEG C to about 165 DEG C, such that a dried basecoat is formed upon the surface of the substrate; and (d) applying a powder topcoating composition over the dried basecoat.
Inventors:
EMCH DONALDSON J
Application Number:
PCT/US2000/013255
Publication Date:
April 05, 2001
Filing Date:
May 15, 2000
Export Citation:
Assignee:
PPG IND OHIO INC (US)
International Classes:
B05D3/02; B05D7/00; F26B3/28; B05D3/04; (IPC1-7): B05D3/02; B05D7/00; F26B3/28
Foreign References:
| US4943447A | 1990-07-24 | |||
| US2472293A | 1949-06-07 | |||
| EP0420583A2 | 1991-04-03 | |||
| DE8803890U1 | 1988-10-13 | |||
| US4907533A | 1990-03-13 | |||
| US4771728A | 1988-09-20 | |||
| US4416068A | 1983-11-22 | |||
| DE1546949A1 | 1969-07-31 |
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