Masterbatch manufacturing method, rubber composition manufacturing method, and tire manufacturing method

Patent metadata

Field	Value
Publication number	US-2020354530-A1
Application number	US-201816954674-A
Country	US
Kind code	A1
Filing date	Nov 7, 2018
Priority date	Dec 21, 2017
Publication date	Nov 12, 2020
Grant date	—

Abstract

A masterbatch manufacturing method comprising: an operation in which a natural rubber latex, and a rubber latex having a mass-average molecular weight that is less than a mass-average molecular weight of the natural rubber latex, are mixed to obtain a pre-slurry-mixing rubber latex for which a mass-average-molecular-weight-to-number-average-molecular-weight ratio is 6 to 10; an operation in which the pre-slurry-mixing rubber latex and a filler slurry are mixed to obtain a pre-coagulation liquid mixture; and an operation in which the pre-coagulation liquid mixture is coagulated.

First claim

1 . A masterbatch manufacturing method comprising:
an operation in which a natural rubber latex, and a rubber latex having a mass-average molecular weight that is less than a mass-average molecular weight of the natural rubber latex, are mixed to obtain a pre-slurry-mixing rubber latex for which a mass-average-molecular-weight-to-number-average-molecular-weight ratio is 6 to 10; an operation in which the pre-slurry-mixing rubber latex and a filler slurry are mixed to obtain a pre-coagulation liquid mixture; and an operation in which the pre-coagulation liquid mixture is coagulated.

2 - 3 . (canceled)

4 . The masterbatch manufacturing method according to claim 1 wherein difference between the mass-average molecular weight of the natural rubber latex and the mass-average molecular weight of the rubber latex is 1,000,000 to 1,700,000.

5 . The masterbatch manufacturing method according to claim 1 wherein the mass-average molecular weight of the natural rubber latex is not less than 2,000,000.

6 . The masterbatch manufacturing method according to claim 1 wherein the mass-average molecular weight of the rubber latex is not greater than 1,200,000.

7 . The masterbatch manufacturing method according to claim 1 wherein the mass-average molecular weight of the rubber latex is not less than 100,000 but not greater than 1,200,000.

8 . The masterbatch manufacturing method according to claim 1 wherein the mass-average molecular weight of the rubber latex is not greater than 1,000,000.

9 . The masterbatch manufacturing method according to claim 1 wherein the mass-average molecular weight of the rubber latex is not less than 200,000 but not greater than 1,000,000.

10 . The masterbatch manufacturing method according to claim 1 wherein, for every 100 parts by mass of dry rubber content in the natural rubber latex, dry rubber content of the rubber latex is not less than 10 parts by mass but not greater than 70 parts by mass.

11 . The masterbatch manufacturing method according to claim 1 wherein, for every 100 parts by mass of dry rubber content in the natural rubber latex, dry rubber content of the rubber latex is not less than 20 parts by mass but not greater than 50 parts by mass.

12 . The masterbatch manufacturing method according to claim 1 wherein the filler slurry is a carbon black slurry.

13 . The masterbatch manufacturing method according to claim 1 further comprising an operation in which a coagulum obtained by the coagulation of the pre-coagulation liquid mixture is dewatered.

14 . The masterbatch manufacturing method according to claim 1 further comprising an operation in which an extruder is used to cause a coagulum obtained by the coagulation of the pre-coagulation liquid mixture to be dewatered.

15 . A rubber composition manufacturing method comprising:
an operation in which the masterbatch manufacturing method according to claim 1 is used to manufacture a masterbatch; and an operation in which the masterbatch and a compounding ingredient are kneaded together.

16 . The rubber composition manufacturing method according to claim 15 further comprising an operation in which a vulcanizing-type compounding ingredient is kneaded into a rubber mixture obtained at the operation in which the masterbatch and the compounding ingredient are kneaded together.

17 . A tire manufacturing method comprising:
an operation in which the rubber composition manufacturing method according to claim 15 is used to manufacture a rubber composition; and an operation in which an unvulcanized tire provided with a tire member fabricated from the rubber composition is vulcanized and molded.

Assignees

• Toyo Tire Corp

Inventors

• Konno Yuya

Classifications

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• C08J2409/10

  Latex (C08J2409/04, C08J2409/08 take precedence) · CPC title

• C08J2307/02

  Latex · CPC title

• C08J3/226

  using a polymer as a carrier · CPC title

• B29D30/06 Primary

  Pneumatic tyres or parts thereof {(e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)} · CPC title