Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Reexamination Certificate
2011-03-01
2011-03-01
Daniels, Matthew J (Department: 1741)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
C264S211000, C264S211230, C366S076100, C366S076600, C366S081000, C366S082000, C366S088000
Reexamination Certificate
active
07897083
ABSTRACT:
The object is to provide a method for manufacturing liquid crystalline resin composition having a hollow filler and a fibrous filler using a common melting-kneading extruder to maintain well-balanced relation between the residual percentages of hollow filler and the fiber length, which balance could not be attained in the prior art. A liquid crystalline resin composition having 5 to 30% by weight of hollow filler and 5 to 30% by weight of fibrous filler is manufactured using a melting-kneading extruder provided with a screw. (1) The liquid crystalline resin is fed from a main feed port located at upstream side in the extruding direction, while a hollow filler and a fibrous filler are fed from a side feed port located at downstream side in the extruding direction. The manufacture is conducted under the specific conditions between (2) L1as the ratio L/D in which D is the screw diameter and L is the distance between the position of the side feed port and the position where the internal pressure of the extruder reaches 0.1 MPa; (3) L2as the ratio L/D in which D is the screw diameter and L is the length of maintaining the internal pressure of the extruder at or above 0.1 MPa after feeding the hollow filler and the fibrous filler; and(4) La as the ratio L/D in which D is the screw diameter and L is the length of the resin plasticizing zone.
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Fukatsu Hiroki
Sakai Masayuki
Watanabe Kazufumi
Buchanan & Ingersoll & Rooney PC
Daniels Matthew J
Minskey Jacob Thomas
Polyplastics Co. Ltd.
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