Powdered varnish and its use for coating the insides of...

Details Powdered varnish and its use for coating the insides of... Powdered varnish and its use for coating the insides of...

C - Chemistry, Metallurgy

09

D

C09D 167/00 (2006.01) C09D 5/03 (2006.01) C09D 163/00 (2006.01)

Patent

CA 2154863

A powder coating for the coating of packaging container weld seams based on epoxy resins and carboxyl-containing polyesters, wherein 1. the powder coating contains A) at least one polyester having an acid value of 25 to 120 mg of KOH/g and an OH value ~ 10 mg of KOH/g, and B) at least one epoxy resin having an epoxide equivalent weight of 400 to 3000, and 2. the powder coating has such a particle size distribution that a) at least 90% by mass of the powder coating particles have a particle size between 1 and 100 µm, b) the maximum particle size of the powder coating particles for at least 99% by weight of the particles is ~ 50 µm, c) the average particle size of the powder coating particles is between > 20 and 60µm, and d) the slope of the particle distribution curve at the inflection point is ~ 50.

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