Process for the preparation of antimicrobial powder coating...

Details Process for the preparation of antimicrobial powder coating... Process for the preparation of antimicrobial powder coating...

2007-12-17

2010-06-15

Cleveland, Michael (Department: 1792)

Coating processes

Solid particles or fibers applied

C106S015050, C264S141000, C427S002100, C427S212000

Reexamination Certificate

active

07736694

ABSTRACT:
A process of preparation of an antimicrobial powder coating composition comprising the steps:a) transforming a natural antimicrobial agent into a salt-form and micronizing the resulting antimicrobial salt into powder,b) mixing at least one of the natural antimicrobial salt together with at least one amino-reactive thermoplastic binder resin,c) subjecting the mixture to a melt compounding process at a temperature in a range of 80 to 230° C., at a residence time period in a range of 5 to 60 seconds, using at least one co-rotating twin-screw extruder with a soft screw design having conveying elements offering a high D/d ratio and having mixing forward kneading block elements,d) cooling the extrudate, ande) micronizing into powder particles.The process forms a powder coating composition containing a natural antimicrobial agent which results in high quality antimicrobial coatings showing a homogeneous distribution of the antimicrobial agent in the coating and a stable antimicrobial activity.

REFERENCES:
patent: 6093407 (2000-07-01), Cummings et al.
patent: 2005/0063246 (2005-03-01), Ponzielli
patent: WO 01/90259 (2001-11-01), None
Rolf D. Joerger, Antimicrobial Activity: Film Contact Method—JIS Z2801, Dept. of Animal and Food Sciences, University of Delaware, Nov. 21, 2005.

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