Thin film metal particulates are removed from FEP sheetstock cheaply and quickly by immersing the coated FEP first in a base and then in an acid. Occasionally, ultrasonic vibration of the FEP may also be required. The particulates are useful as paint pigments when isolated and conversion coated. The FEP is reusable. A preferred binder for carrying the pigments is a two-component system having a tetraketimine and an isocyanate.
REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Patent Application 60/033,638, filed Dec. 20, 1996.
This Application also is a continuation-in-part Application based upon U.S. Application 08/770,606, filed Dec. 19, 1996, now U.S. Pat. No. 5,874,167.
A surface coating which inhibits the formation of ice upon the surface of a substrate comprising a polysiloxane(amide-ureide) having the general formula: ##STR1## wherein R.sub.1 and R.sub.2 are independently selected from the group consisting of C.sub.1 to C.sub.10 alkyls, aryls, and polyaryls; R.sub.3 and R.sub.4 are independently selected from the group consisting of hydrogen, C.sub.1 to C.sub.6 alkyls, aryls, C.sub.3 to C.sub.6 cycloaliphatics, and C.sub.3 to C.sub.6 heterocycles; A.sub.1 and A.sub.2 are independently selected from the group consisting of hydrogen, C.sub.1 to C.sub.6 alkyls, aryls, polyaryls, C.sub.3 to C.sub.6 cycloaliphatics, and C.sub.3 to C.sub.6 heterocycles; x is a number from 1 to 1000; and Y is selected from a dicarboxyl residue and a non-linear diisocyanate residue. The polysiloxane(amide-ureide) is formed by reacting at least one diamine terminated polysiloxane, at least one halide substituted dicarboxylic acid, and at least one non-linear diisocyanate.
Coating production systems and methods which include ultrasonic dispersion and active cooling. The system includes a mixing reservoir and an ultrasonic disperser for ultrasonically dispersing an additive with another coating component within the mixing reservoir. The system also includes a heat exchanger in communication with the mixing reservoir to receive a mixture of the additive and another coating component from the mixing reservoir. The mixture is cooled by thermal energy transfer from the mixture to the heat exchanger. The cooled mixture is returned to the mixing reservoir.
