Extruder screw and method for extruding liquid crystalline polymers

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4786181
SERIAL NO

07121285

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ATTORNEY / AGENT: (SPONSORED)

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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, NJ30

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
O'Brien, Keith T Edison, NJ 6 63

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 4405239 Energy efficient extruder screw 29 1982
 
UNION CARBIDE CORPORATION (1)
* 4350657 Low-energy extruder-pump system 9 1980
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
DELAWARE CAPITAL FORMATION, INC. (1)
* 5363747 Processing vessel having discharge metering/mixing auger 10 1993
 
Other [Check patent profile for assignment information] (3)
* 6599004 Extruder screw with improved energy efficient melting 5 2001
* 8177413 Scientifically designed barrier screw 0 2010
* 2011/0217,406 SCIENTIFICALLY DESIGNED BARRIER SCREW 1 2010
 
DAVIS-STANDARD, LLC (1)
* 5599097 Extruder screw for plastic extruders 16 1995
 
NORDSON CORPORATION (3)
7014353 Plasticating screw and apparatus 3 2003
* 2004/0141,406 Apparatus for plasticating thermoplastics 0 2003
7156550 Apparatus for plasticating thermoplastic resin including polypropylene 4 2004
 
EXXONMOBIL CHEMICAL PATENTS INC. (1)
8853327 Methods and apparatus for forming blends of polyolefin and resin modifier 0 2011
 
BOSTON SCIENTIFIC SCIMED, INC. (4)
7951116 Selective surface modification of catheter tubing 0 2004
* 2006/0106,351 Selective surface modification of catheter tubing 3 2004
8777928 Selective surface modification of catheter tubing 0 2011
9132257 Selective surface modification of catheter tubing 0 2014
 
BUHLER AG (2)
* 2004/0262,807 Method for continuous mixing and preparation processes by means of special ratios of the lateral surface and the free volume and/or internal and external diameter of the screw 1 2004
* 2005/0248,052 Method for continuous mixing and preparation processes by means of special ratios of the lateral surface and the free volume and/or internal and external diameter of the screw 0 2005
 
NEW CASTLE INDUSTRIES, INC. (1)
* 6672753 Apparatus for plasticating thermoplastics 5 2002
* Cited By Examiner