Title:
PROCESSES FOR DRYING AND CURING PRIMER COATING COMPOSITIONS
Document Type and Number:
WIPO Patent Application WO2000072982
Kind Code:
A3
Abstract:
Processes for drying primer coating compositions applied to a surface of a substrate are provided in which the primer coating composition, if a liquid or powder slurry, is exposed to low velocity air having a temperature ranging from about 10 DEG C to about 50 DEG C for a period of at least about 30 seconds to volatilize at least a portion of volatile material from the liquid primer coating composition. Next, infrared radiation and low velocity warm air are applied simultaneously to the primer coating composition (liquid, powder slurry or powder) for a period of at least about 1 minute during which the temperature of the substrate is increased at a rate ranging from about 0.2 DEG C per second to about 2 DEG C per second to achieve a peak substrate temperature of the substrate ranging from about 30 DEG C to about 120 DEG C. Infrared radiation and hot air are applied simultaneously to the primer composition for a period of at least about 2 minutes during which the temperature of the substrate is increased at a rate ranging from about 0.1 DEG C per second to about 1 DEG C per second to achieve a peak temperature of the substrate ranging from about 40 DEG C to about 155 DEG C, such that a dried primer coating is formed upon the surface of the substrate.
Inventors:
EMCH DONALDSON J
Application Number:
PCT/US2000/013366
Publication Date:
March 15, 2001
Filing Date:
May 15, 2000
Export Citation:
Assignee:
PPG IND OHIO INC (US)
International Classes:
B05D3/02; F26B3/28; B05D3/04; (IPC1-7): B05D3/02; 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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