Rubber tyre compound production method

Patent metadata

Field	Value
Publication number	US-2016145418-A1
Application number	US-201414905209-A
Country	US
Kind code	A1
Filing date	Jul 18, 2014
Priority date	Jul 18, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A method of producing rubber compounds, in which the polymer base is composed partly of a first polymer material, which is either produced by emulsion polymerization or is natural rubber, and partly of a second polymer material produced by solution polymerization. The method includes a preliminary second polymer material treating step, in which the second polymer material, silica, a silane bonding agent, and at least one nucleophile agent are mixed with one another; a first mixing step, in which at least the first polymer material, silica, and a silane bonding agent are added to the compound resulting from the preliminary second polymer material treating step; and a second mixing step, in which stearic acid and a curing system are added to the compound being produced.

First claim

1 . A method of producing rubber compounds, in which the polymer base is composed partly of a first polymer material, which is either produced by emulsion polymerization or is natural rubber, and partly of a second polymer material produced by solution polymerization; said method being characterized by comprising a preliminary said second polymer material treating step, in which said second polymer material, silica, a silane bonding agent, and at least one nucleophile agent are mixed with one another; a first mixing step, in which at least said first polymer material, silica, and a silane bonding agent are added to the compound resulting from the preliminary said second polymer material treating step; and a second mixing step, in which stearic acid and a curing system are added to the compound being produced.

2 . A method of producing rubber compounds, as claimed in claim 1 , characterized in that said nucleophile agent is a curing accelerant.

3 . A method of producing rubber compounds, as claimed in claim 2 , characterized in that said nucleophile agent is in the guanidine class.

4 . A method of producing rubber compounds, as claimed in claim 3 , characterized in that the guanidine class nucleophile agent is selected from the group consisting of diphenyl guanidine (DPG), triphenyl guanidine (TPG), diorthotolyl-guanidine (DOTG), o-tolylbiguanidine (OTBG), guanidine salts (nitrates, carbonates, acetates, thiocyanates, sulphates) and derivatives thereof.

5 . A method of producing rubber compounds, as claimed in claim 3 , characterized in that 0.6 to 5 phr of the guanidine class nucleophile agent is added at the preliminary said second polymer material treating step.

6 . A method of producing rubber compounds, as claimed in claim 1 , characterized by comprising a preliminary said first polymer material treating step parallel to said preliminary said second polymer material treating step, and in which said first polymer material, silica, a silane bonding agent, and at least one curing accelerant in the sulphenamide class are mixed with one another; at said first mixing step, the compound resulting from said preliminary said first polymer material treating step being mixed with the compound resulting from the preliminary said second polymer material treating step.

7 . A method of producing rubber compounds, as claimed in claim 6 , characterized in that the sulphenamide class curing accelerant is selected from the group consisting of benzothiazyl-cyclohexyl-sulphenamide (CBS), N-tert-butyl-2-benzothiazyl sulphenamide (TBBS), 2-mercaptobenzothiazole (MBT), sodium or zinc salts of 2-mercaptobenzothiazole (ZMBT), benzothiazyl-2-dicyclohexyl sulphenamide (DCBS), benzothiazole disulphide (MBTS), tetrabenzylthiuramdisulphide (TBzTD), and mixtures thereof.

8 . A method of producing rubber compounds, as claimed in claim 6 , characterized in that 0.6 to 5 phr of the sulphenamide class curing accelerant is mixed with said first polymer material.

9 . A method of producing rubber compounds, as claimed in claim 1 , characterized in that said first polymer material and said second polymer material are styrene-butadiene copolymer (SBR)-based.

10 - 12 . (canceled)

Assignees

• Agoretti Pasquale
• Privitera Davide
• Bridgestone Corp

Inventors

• Agoretti Pasquale
• Privitera Davide

Classifications

• C08K5/31

  Guanidine; Derivatives thereof · CPC title

• C08K3/36

  Silica · CPC title

• C08K5/47

  Thiazoles · CPC title

• C08K5/09

  Carboxylic acids; Metal salts thereof; Anhydrides thereof · CPC title

• C08K5/548 Primary

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title