Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1999-11-24
2000-12-12
Cameron, Erma
Coating processes
With post-treatment of coating or coating material
Heating or drying
427392, 4273934, 427421, 4274301, B05D 102, B05D 118, B05D 302
Patent
active
061595489
ABSTRACT:
A method is provided for after-treating fabric with a fluoroacrylate emulsion by spraying or immersion. The immersion can be carried out in a laundering process (preferably in a late cycle of the process) or even under poorly-controlled conditions (e.g. field conditions). The spraying embodiment of this method is useful for treating large, previously manufactured items comprising fabric (e.g. upholstered furniture, tents, awnings, and the like) with an aerosol spray containing micrometer or submicrometer-sized droplets of a diluted version of the fluoroacrylate emulsion. In all embodiments, the fluoroacrylate emulsion contains, dispersed therein with the aid of a surfactant system, essentially a single hydrophobic component comprising a particulate fluoroacrylate copolymer having repeating units of the formulas I and II ##STR1## wherein R.sub.f is a C.sub.8 -rich fluorinated alkyl radical; R and R.sup.1 are hydrogen or alkyl; and R.sup.2 is hydrogen or substituted or unsubstituted alkyl. The aqueous dispersion further contains, in addition to the surfactant system, a minor amount of polar organic liquid. Depending upon the melting or softening point of the fluoroacrylate copolymer, drying under heat can be optional and in any event can be carried out at temperatures below 100.degree. C.
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