Extruder assembly for extruding water-curable silane modified polymers

• US 4,564,349 A
• Filed: 04/27/1984
• Issued: 01/14/1986
• Est. Priority Date: 06/01/1983
• Status: Expired due to Term

• Current Assignee: Union Carbide Corporation (Dow, Inc.)
• Original Assignee: Union Carbide Corporation (Dow, Inc.)
• Inventors: Brown, Geoffrey D.
• Primary Examiner(s): LINDSAY JR, ROBERT
• Application Number:
  US06/603,143
• Time in Patent Office: 627 Days
• Field of Search: 425/4 C, 425/817 C, 425/113, 425/122, 425/131.7, 425/133.1, 425/376 R, 425/207, 366/88, 366/89, 366/90, 366/323, 366/324
• US Class Current: 425/207
• CPC Class Codes: B29B 7/421 with screw and additionally other mixing elements on the same shaft, e.g. paddles, discs, bearings, rotor blades of the Banbury type
• CPC Class Codes: B29B 7/429 Screws B29B7/421 takes precedence
• CPC Class Codes: B29B 7/603 in measured doses, e.g. proportioning of several materials
• CPC Class Codes: B29B 7/726 Measuring properties of mixture, e.g. temperature or density B29B7/724 takes precedence
• CPC Class Codes: B29B 7/748 Plants B29B7/7433, B29B7/7485, B29B7/7495 take precedence
• CPC Class Codes: B29B 7/7485 with consecutive mixers, e.g. with premixing some of the components
• CPC Class Codes: B29B 7/823 Temperature control
• CPC Class Codes: B29B 7/826 Apparatus therefor
• CPC Class Codes: B29B 7/94 Liquid charges
• CPC Class Codes: B29C 48/154 Coating solid articles, i.e. non-hollow articles
• CPC Class Codes: B29C 48/34 Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
• CPC Class Codes: B29C 48/507 characterised by the material or their manufacturing process
• CPC Class Codes: B29C 48/565 having projections other than the thread, e.g. pins
• CPC Class Codes: B29C 48/6801 characterised by the material or their manufacturing process
• CPC Class Codes: B29C 48/686 having grooves or cavities
• CPC Class Codes: H01B 3/441 from alkenes
• CPC Class Codes: H01B 3/46 silicones

Abstract

An extruder assembly for admixing and reacting a hydrolyzable silane reactant with a thermoplastic polymer to produce a water-curable, silane modified polymer and for extruding the resultant polymer into a shaped product.

Claims

1. An extruder assembly, suitable for admixing and reacting a composition containing a silane and a thermoplastic polymer to form a water-curable, silane modified thermoplastic polymer and for extruding said silane modified polymer, comprising a cylindrical barrel housing and a rotating compression screw mounted within said barrel housing, the channel depth defined between the root diameter of said compression screw and said cylindrical barrel housing being substantially constant, uniformly decreasing and being substantially constant thereby defining in sequence, a feed zone, a transition zone and a metering zone, the portion of said cylindrical housing which, in conjunction with said compression screw defines the feed zone being axially grooved and that portion of the rotating compression screw in the metering zone having mixing pins extending substantially perpendiculary therefrom, a mixer, mounted at the terminal end of said rotating compression screw for receiving material from said metering zone, defining a reaction zone wherein the reaction between the silane and the thermoplastic polymer is substantially completed and from which zone the reacted product is fed into an extrusion die positioned at the terminal end of said reaction zone, said mixer comprising a series of vanes on a stationary shaft mounted in a cylindrical barrel housing or said mixer is a dynamic device mounted to and rotating with said rotation compression screw comprising a rotating screw defining, in conjunction with the cylindrical barrel of the extruder assembly, a channel depth greater than the channel depth of said metering zone and means to rotate said rotating compression screw whereby material is fed through said feed zone, transition zone, metering zone and reaction zone and into and out of said extrusion die.

2. An extrusion assembly as defined in claim 1 wherein the said mixer is a dynamic device mounted to and rotating with said rotating compression screw comprising a rotating screw defining, in conjuction with the cylindrical barrel of the extruder assembly, a channel depth greater than the channel depth of the metering zone.

3. An extrusion assembly as defined in claim 1 wherein said mixer is a static device comprising a series of vanes on a stationary shaft mounted in a cylindrical barrel housing.