Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Reexamination Certificate
2004-03-25
2010-02-23
Wollschlager, Jeffrey (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
C264S040600, C264S211000, C264S211230, C264S211240
Reexamination Certificate
active
07666338
ABSTRACT:
An extrusion process for manufacturing powder coating compositions is disclosed. The process generally includes a shear mixing step done at ambient temperature and a focused heating step in which the shear mix is heated to a higher temperature for a shorter time than in conventional methods. The focused heating provides for a shorter heat history, resulting in enhanced coating properties. The mixture may be cooled before it leaves the extruder.
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Ferencz Joseph M.
Gaspar Vincent A.
Meyers Diane R.
PPG Industries Ohio Inc.
Wollschlager Jeffrey
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