Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2005-01-15
2008-12-23
Cain, Edward J (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S313000
Reexamination Certificate
active
07468404
ABSTRACT:
A continuous process for incorporating a thermally sensitive additive into a polymer melt of virgin polymer at a temperature at least 10° C. below a temperature at which the virgin polymer is typically processed. The virgin polymer is first processed in an apparatus which extensively shear-thins the polymer until its normally entangled molecules are substantially disentangled. This is preferably done in a TekFlow® processor. The additive is then added to the resulting modified melt which is then processed in a high-shear apparatus, e.g. a co-rotating, twin-screw extruder, but more preferably in a second TekFlow® processor. This novel process allows making concentrates having a level of additive which could not be made to date and yet have the additive substantially uniformly dispersed. In particular a concentrate of polypropylene having a 30% by wt concentration of an organoclay in which the platelets are substantially uniformly dispersed, at least 10% more strongly intercalated than prior to treatment, and substantially fully exfoliated, is made with this process.
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International Preliminary Report on Patentability for PCT/US2005/001231 issued by the International Bureau of WIPO on Jul. 17, 2006.
Baker & Daniels LLP
Cain Edward J
Stratek Plastic Ltd.
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