Tire manufacturing method

Patent metadata

Field	Value
Publication number	US-10889658-B2
Application number	US-201715704125-A
Country	US
Kind code	B2
Filing date	Sep 14, 2017
Priority date	Oct 14, 2016
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A tire manufacturing method includes making a master batch, using the master batch to make a rubber composition, and making a green tire. The master batch is made wherein a carbon-black-containing pre-coagulation rubber latex is coagulated to obtain a coagulum; a compound according to Formula (I) is added to the water-containing coagulum;

wherein R 1 and R 2 each indicates a hydrogen atom, an alkyl group having 1 to 20 carbons, an alkenyl group having 1 to 20 carbons, or an alkynyl group having 1 to 20 carbons, R 1 and R 2 may be the same or different, and M + indicates sodium ion, potassium ion, or lithium ion; and the compound according to Formula (I) is dispersed within the coagulum. The green tire is provided with unvulcanized rubber sheeting made up of the rubber composition, chafer(s), carcass ply or plies, and bead filler(s).

First claim

The invention claimed is:

1. A tire manufacturing method comprising:
an operation in which a master batch is made;
an operation in which the master batch is used to make a rubber composition; and
an operation in which a green tire is made, the green tire being provided with
a bead filler,
a carcass ply comprising a turnup disposed at a location toward an exterior in the tire width direction from the bead filler,
a chafer comprising a chafer end disposed at a location toward the exterior in the tire width direction from the turnup, and
unvulcanized rubber sheeting that is made up of the rubber composition and that comprises a connecting portion which is disposed at a location between the turnup and the chafer end;

wherein the operation in which the master batch is made comprises
an operation in which carbon-black-containing pre-coagulation rubber latex in which at least carbon black is dispersed in water is coagulated to obtain a coagulum which contains the water derived from the carbon-black-containing pre-coagulation rubber latex;
an operation in which a compound according to Formula (I), below, is added to the coagulum; and
an operation in which the compound is dispersed within the coagulum;

wherein Formula (I) is given by

and
wherein, at Formula (I), R 1 and R 2 each indicates a hydrogen atom, an alkyl group having 1 to 20 carbons, an alkenyl group having 1 to 20 carbons, or an alkynyl group having 1 to 20 carbons;
R 1 and R 2 may be the same or different; and
M + indicates sodium ion, potassium ion, or lithium ion,
wherein the operation in which the compound is dispersed within the coagulum is an operation in which the compound is dispersed within the coagulum as the coagulum is being dewatered.

2. A tire manufacturing method comprising:
an operation in which a master batch is made;
an operation in which the master batch is used to make a rubber composition; and
an operation in which a green tire is made, the green tire being provided with
a bead filler,
a carcass ply comprising a turnup disposed at a location toward an exterior in the tire width direction from the bead filler,
a chafer comprising a chafer end disposed at a location toward the exterior in the tire width direction from the turnup, and
unvulcanized rubber sheeting that is made up of the rubber composition and that comprises a connecting portion which is disposed at a location between the turnup and the chafer end;

wherein the operation in which the master batch is made comprises
an operation in which carbon-black-containing pre-coagulation rubber latex in which at least carbon black is dispersed in water is coagulated to obtain a coagulum which contains the water derived from the carbon-black-containing pre-coagulation rubber latex;
an operation in which a compound according to Formula (I), below, is added to the coagulum; and
an operation in which the compound is dispersed within the coagulum;

wherein Formula (I) is given by

and
wherein, at Formula (I), R 1 and R 2 each indicates a hydrogen atom, an alkyl group having 1 to 20 carbons, an alkenyl group having 1 to 20 carbons, or an alkynyl group having 1 to 20 carbons;
R 1 and R 2 may be the same or different; and
M + indicates sodium ion, potassium ion, or lithium ion,
wherein at the operation in which the compound is added to the coagulum, taking the amount of water in the coagulum for every 100 parts by mass of rubber within the coagulum to be Wa, and taking the amount of the compound that is added for every 100 parts by mass of rubber within the coagulum to be Wb, Wa/Wb, being the ratio of Wa to Wb, is in a range that is 1 to 8100.

3. The tire manufacturing method according to claim 1 wherein a thickness of the unvulcanized rubber sheeting is not less than 0.1 mm.

Assignees

• Toyo Tire & Rubber Co
• Toyo Tire Corp

Inventors

• Miyasaka Takashi

Classifications

• C08C1/14 Primary

  Coagulation · CPC title

• B29D2030/486

  Additional components for the tyre bead areas, e.g. cushioning elements, chafers, flippers · CPC title

• B29D30/48

  Bead-rings or bead-cores (from wire B21F37/00); Treatment thereof prior to building the tyre · CPC title

• B60C2015/0621

  adjacent to the carcass turnup portion · CPC title

• B60C2001/005

  Compositions of the bead portions, e.g. clinch or chafer rubber or cushion rubber · CPC title