US Patent No: 4,786,181

Number of patents in Portfolio can not be more than 2000

Extruder screw and method for extruding liquid crystalline polymers

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Abstract

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The present invention relates to a novel extruder screw and method for extruding low melt viscosity polymers which form an anisotropic melt phase. In a preferred embodiment, the method and apparatus according to the present invention employ a high rate of rotational speed of the extruder screw in combination with a relatively low compression ratio and a high volume rate of flow through a compression section in order to effectively extrude the low melt viscosity liquid crystalline polymers. The particular design of the screw is dictated by the unique rheology of the polymers which are difficult to effectively move along the helix of the screw due, in part, to the extremely low viscosity. Each dimension and each relative size of the various sections of the screw must be carefully controlled in order to effectively extrude the unique material.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HOECHST CELANESE CORPORATIONSOMERVILLE, NJ1157

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
O'Brien, Keith T Jacksonville, FL 6 52

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Iddon Brothers Limited (1)
4,201,481 Scrolls for extruding machines 22 1978
 
Phillips Cables Limited (1)
4,181,647 Process for extrusion coating of a wire with a cellular thermoplastic resin material 52 1976
 
Union Carbide Corporation (1)
4,350,657 Low-energy extruder-pump system 9 1980
 
Other [Check patent profile for assignment information] (1)
4,405,239 Energy efficient extruder screw 27 1982

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
NORDSON CORPORATION (3)
6,672,753 Apparatus for plasticating thermoplastics 4 2002
7,014,353 Plasticating screw and apparatus 2 2003
7,156,550 Apparatus for plasticating thermoplastic resin including polypropylene 4 2004
 
BOSTON SCIENTIFIC SCIMED, INC. (1)
7,951,116 Selective surface modification of catheter tubing 0 2004
 
DAVIS-STANDARD, LLC (1)
5,599,097 Extruder screw for plastic extruders 16 1995
 
DELAWARE CAPITAL FORMATION, INC. (1)
5,363,747 Processing vessel having discharge metering/mixing auger 4 1993
 
Other [Check patent profile for assignment information] (2)
6,599,004 Extruder screw with improved energy efficient melting 5 2001
8,177,413 Scientifically designed barrier screw 0 2010