Process for producing wet rubber masterbatch, wet rubber masterbatch, and rubber composition containing wet rubber masterbatch

Patent metadata

Field	Value
Publication number	US-10253141-B2
Application number	US-201515308623-A
Country	US
Kind code	B2
Filing date	Jan 9, 2015
Priority date	Jun 19, 2014
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

A method for producing a wet rubber masterbatch uses a single-screw extruder. The single-screw extruder includes a screw, and an external cylinder in which a slit extended along the length direction of the external cylinder (the screw-shaft direction) is formed in an internal wall surface of the external cylinder, and when the width of the slit is represented by A and the clearance between a crest of the screw and the internal wall surface of the external cylinder is represented by B, the following expression (1) is satisfied:

0< AB ( Y )/ AB ( X )<0.9  (1)

wherein AB (Y) is the product of A and B at a downstream side along the screw-shaft direction of the external cylinder, and AB (X) is the product of A and B at an upstream side along the screw-shaft direction of the external cylinder.

First claim

The invention claimed is:

1. A method for producing a wet rubber masterbatch obtained using at least a filler, a dispersing solvent and a rubber latex solution as raw materials, wherein the method comprises:
a coagulation step of mixing a slurry solution containing the filler and the dispersing solvent, and the rubber latex solution with each other to be coagulated, thereby producing a filler-containing rubber coagulate, and
a heating step of using a single-screw extruder to heat the filler-containing rubber coagulate to 160° C. to 200° C., thereby dehydrating, drying and plasticizing the filler-containing rubber coagulate in a single step,
wherein the single-screw extruder includes a screw, and an external cylinder in which a slit extended along the length direction of the external cylinder, in the screw-shaft direction, is formed in an internal wall surface of the external cylinder, and
when the width of the slit is represented by A and the clearance between a crest of the screw and the internal wall surface of the external cylinder is represented by B, the following expression (1) is satisfied:
0< AB ( Y )/ AB ( X )<0.9  (1)

wherein AB (Y) is the product of A and B at a downstream side along the screw-shaft direction of the external cylinder, and AB (X) is the product of A and B at an upstream side along the screw-shaft direction of the external cylinder.

2. The wet rubber masterbatch producing method according to claim 1 , wherein the screw is a screw having a shaft diameter that increases from the upstream side toward the downstream side along the screw-shaft direction.

3. The wet rubber masterbatch producing method according to claim 1 , wherein the screw is a screw having at least one step permitting the shaft diameter of the screw to become larger toward a downstream side of the screw.

4. A wet rubber masterbatch produced by the producing method claim 1 .

5. A rubber composition comprising the wet rubber masterbatch according to claim 4 .

Assignees

• Toyo Tire & Rubber Co

Inventors

• Nishimura Chiya

Classifications

• C08C1/14

  Coagulation · CPC title

• C08J3/22 Primary

  using masterbatch techniques · CPC title

• B29C47/6012

  Operations & Transport · mapped topic

• B29K2021/00

  Use of unspecified rubbers as moulding material · CPC title

• C08L21/02

  Latex · CPC title