Processes for producing wet rubber masterbatch and rubber composition

Patent metadata

Field	Value
Publication number	US-2018201741-A1
Application number	US-201615743789-A
Country	US
Kind code	A1
Filing date	Aug 10, 2016
Priority date	Nov 16, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

A process for producing a wet rubber masterbatch yielded by using, as raw materials, at least a filler, a dispersing solvent, and a rubber latex solution, comprises a step (i) of mixing the filler, the dispersing solvent and the rubber latex solution with each other to produce a filler-containing rubber latex solution, a step (ii) of solidifying the filler-containing rubber latex solution to produce a filler-containing rubber solidified product, and a step (iii) of dehydrating the filler-containing rubber solidified product to produce the wet rubber masterbatch. At the time of representing the temperature of the filler-containing rubber solidified product before the dehydration in the step (iii) by T1 (° C.), and representing the temperature of the filler-containing rubber solidified product after the dehydration by T2 (° C.), the following expressions (1) and (2) are satisfied:
T 1≤100  (1)

80≤ T 2− T 1≤160  (2).

First claim

1 . A process for producing a wet rubber masterbatch yielded by using, as raw materials, at least a filler, a dispersing solvent, and a rubber latex solution, comprising:
a step (i) of mixing the filler, the dispersing solvent and the rubber latex solution with each other to produce a filler-containing rubber latex solution, a step (ii) of solidifying the filler-containing rubber latex solution to produce a filler-containing rubber solidified product, and a step (iii) of dehydrating the filler-containing rubber solidified product to produce the wet rubber masterbatch, wherein at the time of representing the temperature of the filler-containing rubber solidified product before the dehydration in the step (iii) by T1 (° C.), and representing the temperature of the filler-containing rubber solidified product after the dehydration by T2 (° C.), the following expressions (1) and (2) are satisfied:
T 1≤100  (1)

80≤ T 2− T 1≤160  (2).

2 . The wet rubber masterbatch producing process according to claim 1 , wherein the step (iii) is a step of using a monoaxial extruder or a biaxial extruder to dehydrate the filler-containing rubber solidified product, and the rotation number R (rpm) of a screw of the monoaxial extruder or the biaxial extruder satisfies the following: 2≤R≤35.

3 . The wet rubber masterbatch producing process according to claim 2 , wherein the temperature of only a partial moiety of the screw at an outlet side of the screw is adjusted to a temperature of 100° C. or higher and lower than 270° C.

4 . The wet rubber masterbatch producing process according to claim 2 , wherein at the time of representing the entire length of the screw that is measured from a tip of the screw at an/the outlet side of the screw by L, the temperature of a moiety of the screw that has a length of αL wherein 0.4≤α≤0.95 from the tip of the screw at the outlet side thereof is adjusted to a temperature of 100° C. or higher and lower than 270° C.

5 . A process for producing a rubber composition comprising a wet rubber masterbatch yielded by using, as raw materials, at least a filler, a dispersing solvent, and a rubber latex solution, comprising:
a step (i) of mixing the filler, the dispersing solvent and the rubber latex solution with each other to produce a filler-containing rubber latex solution, a step (ii) of solidifying the filler-containing rubber latex solution to produce a filler-containing rubber solidified product, a step (iii) of dehydrating the filler-containing rubber solidified product to produce the wet rubber masterbatch, and a step (iv) of dry-mixing the wet rubber masterbatch with various blending agents to produce the rubber composition, wherein at the time of representing the temperature of the filler-containing rubber solidified product before the dehydration in the step (iii) by T1 (° C.), and representing the temperature of the filler-containing rubber solidified product after the dehydration by T2 (° C.), the following expressions (1) and (2) are satisfied:
T 1≤100  (1)

80≤ T 2− T 1≤160  (2).

6 . The rubber composition producing process according to claim 5 , wherein the step (iii) is a step of using a monoaxial extruder or a biaxial extruder to dehydrate the filler-containing rubber solidified product, and the rotation number R (rpm) of a screw of the monoaxial extruder or the biaxial extruder satisfies the following: 2≤R≤35.

7 . The rubber composition producing process according to claim 6 , wherein the temperature of only a partial moiety of the screw at an outlet side of the screw is adjusted to a temperature of 100° C. or higher and lower than 270° C.

8 . The rubber composition producing process according to claim 6 , wherein at the time of representing the entire length of the screw that is measured from a tip of the screw at an/the outlet side of the screw by L, the temperature of a moiety of the screw that has a length of αL wherein 0.4≤α≤0.95 from the tip of the screw at the outlet side thereof is adjusted to a temperature of 100° C. or higher and lower than 270° C.

Assignees

• Toyo Tire & Rubber Co

Inventors

• Tanaka Makoto

Classifications

• B29C48/92

  Measuring, controlling or regulating · CPC title

• C08J3/212

  and solid additives · CPC title

• B29C2948/92704

  Temperature · CPC title

• B29C48/022

  characterised by the choice of material · CPC title

• B29C48/288

  in solid form, e.g. powder or granules · CPC title