WO2016185351A1 - Tyre sealant layer - Google Patents

Tyre sealant layer Download PDF

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Publication number
WO2016185351A1
WO2016185351A1 PCT/IB2016/052794 IB2016052794W WO2016185351A1 WO 2016185351 A1 WO2016185351 A1 WO 2016185351A1 IB 2016052794 W IB2016052794 W IB 2016052794W WO 2016185351 A1 WO2016185351 A1 WO 2016185351A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealant layer
compound
tyre
kraft lignin
lignin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2016/052794
Other languages
French (fr)
Inventor
Pasquale Agoretti
John Nazareno HOUSE
Francesco MADAU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP2017559598A priority Critical patent/JP6781169B2/en
Priority to EP16733192.5A priority patent/EP3294535B1/en
Priority to CN201680028244.8A priority patent/CN107636065B/en
Priority to US15/572,813 priority patent/US10549493B2/en
Publication of WO2016185351A1 publication Critical patent/WO2016185351A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
    • B29C73/16—Auto-repairing or self-sealing arrangements or agents
    • B29C73/22—Auto-repairing or self-sealing arrangements or agents the article containing elements including a sealing composition, e.g. powder being liberated when the article is damaged
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/005—Lignin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon

Definitions

  • the present invention concerns a compound for preparing a tyre sealant layer.
  • a viscous sealant layer generally arranged in the inner cavity of the tyre in contact with the air or covered by a protective rubber or polymer layer
  • the sealant layer is generally arranged on the central zone of the inner cavity in the area of the tread strip.
  • the object of the sealant layer is to surround and adhere to the object that has penetrated the tread, thus preventing the outflow of air from the tyre by instant "sealing".
  • the material of the sealant layer will be arranged to occupy the hole left by the object sealing the same.
  • the viscosity of the sealant layer must guarantee both the sealing action with respect to the penetrated object and with respect to any hole as described above, and its stability in the inner cavity regardless of the static or dynamic conditions of the tyre.
  • the sealant layer being constantly in contact with the pressurized air, is one of the parts of the tyre most exposed to oxidative degradation, consequently compromising its sealing capacity.
  • Lignin is an organic substance which binds the cells and the fibres that make up wood and the lignified elements of plants. After cellulose, it is the most abundant renewable source of carbon on the earth. Although it is not possible to define the precise structure of lignin as a chemical molecule, lignin can be defined as a dendritic polymer based on the following three phenylpropane units: -p-coumaryl alcohol; -coniferyl alcohol ( 4-hydroxy-3-methoxycinnamyl alcohol); -sinapyl alcohol (4- hydroxy-3 , 5-dimethoxycinnamyl alcohol) .
  • lignin There are substantially two types of lignin on the market: sulfonate lignin and kraft lignin.
  • Kraft lignin is a by-product of the Kraft process, used to chemically extract cellulose from wood. It is obtained by precipitation, lowering the pH of the spent liquor of the Kraft process. For this reason kraft lignin, unlike sulfonate lignin, does not have sulfonate groups.
  • the inventors of the present invention have surprisingly found that the use of kraft lignin in the compound for production of the sealant layer is able to guarantee conservation of the sealing characteristics of the same during the life of the tyre .
  • the subject of the present invention is a compound for tyre sealant layer comprising at least one polymer base consisting of an essentially saturated polymer and a filler; said compound being characterized by the fact that said filler comprises kraft lignin.
  • essentially saturated polymer we mean a polymer produced with less than 15% in moles of diene monomers.
  • the compound for sealant layer comprises 0.5 to 40 phr, more preferably at least 5 phr, of kraft lignin.
  • the filler comprises carbon black.
  • the kraft lignin constitutes 0.5 to 100%, more preferably at least 10%, by weight of the whole filler.
  • said polymer base consisting of an essentially saturated polymer is a halobutyl and/or butyl rubber.
  • a further subject of the present invention is a tyre sealant layer produced with the compound according to the present invention.
  • a further subject of the present invention is a tyre comprising a sealant layer produced with the compound according to the present invention.
  • comparison compound A is relative to a compound currently used to prepare sealant layers
  • comparison compound B differs from the comparison compound A due to the fact that part of the carbon black has been replaced with sulfonate lignin.
  • the compound of the invention C differs from the comparison compound ⁇ due to the fact that part of the carbon black has been replaced with kraft lignin.
  • comparison compound B and the compound of invention C differ only due to the type of lignin used.
  • Table I shows the compositions in phr of the three compounds
  • Br-IIR stands for bromobutyl rubber.
  • the sulfonate lignin used in the examples is sold under the trade name "Borresperse NA" by the company Borregaard.
  • the kraft lignin used in the examples is sold under the trade name "Indulin AT” by the company WestVaco.
  • the mixing step production process is described below.
  • the test was performed on tyres on which a respective sealant layer produced with a respective compound A- C was applied, in the same conditions.
  • the sealant layer is extruded directly on the surface of the inner cavity of the tyre.
  • the tyres after being inflated with the same internal pressure, were subjected to the same puncturing conditions with subsequent removal of the object used for the puncturing. For each of the tyres that underwent the test, retention of the pressure after 24h from puncturing (and subsequent removal of the object) was evaluated.
  • Table II shows the evaluations of the air retention expressed in a form indexed to the result obtained with the sealant layer produced with the compound A before undergoing the ageing process. The higher the indexed value, the better the pressure retention .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Sealing Material Composition (AREA)
  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

A compound for a tyre sealant layer comprising at least one polymer base consisting of an essentially saturated polymer and a filler, which in turn comprises kraft lignin.

Description

"TYRE SEALANT LAYER" TECHNICAL FIELD
The present invention concerns a compound for preparing a tyre sealant layer.
BACKGROUND ART
The use in tyres of a viscous sealant layer generally arranged in the inner cavity of the tyre in contact with the air or covered by a protective rubber or polymer layer has been known for some time. In particular, the sealant layer is generally arranged on the central zone of the inner cavity in the area of the tread strip. The object of the sealant layer is to surround and adhere to the object that has penetrated the tread, thus preventing the outflow of air from the tyre by instant "sealing". Furthermore, if the penetrated object comes out of the tread, the material of the sealant layer will be arranged to occupy the hole left by the object sealing the same.
Part of the research into tyres concentrates on improving the effectiveness of the sealant layer with particular attention to its rheological characteristics. In fact, the viscosity of the sealant layer must guarantee both the sealing action with respect to the penetrated object and with respect to any hole as described above, and its stability in the inner cavity regardless of the static or dynamic conditions of the tyre. As may appear evident to a person skilled in the art, the sealant layer, being constantly in contact with the pressurized air, is one of the parts of the tyre most exposed to oxidative degradation, consequently compromising its sealing capacity.
The need was therefore felt for a sealant layer, with technical such as to guarantee maintenance of its sealant properties throughout the life of the tyre.
Lignin is an organic substance which binds the cells and the fibres that make up wood and the lignified elements of plants. After cellulose, it is the most abundant renewable source of carbon on the earth. Although it is not possible to define the precise structure of lignin as a chemical molecule, lignin can be defined as a dendritic polymer based on the following three phenylpropane units: -p-coumaryl alcohol; -coniferyl alcohol ( 4-hydroxy-3-methoxycinnamyl alcohol); -sinapyl alcohol (4- hydroxy-3 , 5-dimethoxycinnamyl alcohol) .
There are substantially two types of lignin on the market: sulfonate lignin and kraft lignin.
Kraft lignin is a by-product of the Kraft process, used to chemically extract cellulose from wood. It is obtained by precipitation, lowering the pH of the spent liquor of the Kraft process. For this reason kraft lignin, unlike sulfonate lignin, does not have sulfonate groups.
The inventors of the present invention have surprisingly found that the use of kraft lignin in the compound for production of the sealant layer is able to guarantee conservation of the sealing characteristics of the same during the life of the tyre .
DISCLOSURE OF INVENTION
The subject of the present invention is a compound for tyre sealant layer comprising at least one polymer base consisting of an essentially saturated polymer and a filler; said compound being characterized by the fact that said filler comprises kraft lignin. Here and below by "essentially saturated polymer" we mean a polymer produced with less than 15% in moles of diene monomers. Preferably, the compound for sealant layer comprises 0.5 to 40 phr, more preferably at least 5 phr, of kraft lignin. Preferably, the filler comprises carbon black.
Preferably, the kraft lignin constitutes 0.5 to 100%, more preferably at least 10%, by weight of the whole filler. Preferably, said polymer base consisting of an essentially saturated polymer is a halobutyl and/or butyl rubber.
A further subject of the present invention is a tyre sealant layer produced with the compound according to the present invention.
A further subject of the present invention is a tyre comprising a sealant layer produced with the compound according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Some embodiment examples are given below for purely illustrative non-limiting purposes. Three compounds were prepared (A-C),the first two of which (A and B) constitute two comparison examples, and the third (C) constitutes an example of a compound produced according to the precepts of the present invention. In particular, the comparison compound A is relative to a compound currently used to prepare sealant layers, while the comparison compound B differs from the comparison compound A due to the fact that part of the carbon black has been replaced with sulfonate lignin.
The compound of the invention C differs from the comparison compound Ά due to the fact that part of the carbon black has been replaced with kraft lignin.
Basically the comparison compound B and the compound of invention C differ only due to the type of lignin used.
Table I shows the compositions in phr of the three compounds
TABLE I
Figure imgf000005_0001
Br-IIR stands for bromobutyl rubber. The sulfonate lignin used in the examples is sold under the trade name "Borresperse NA" by the company Borregaard.
The kraft lignin used in the examples is sold under the trade name "Indulin AT" by the company WestVaco.
The mixing step production process is described below.
- Mixing step -
The ingredients indicated in Table I were mixed together and kept under stirring at a temperature of 100°C for 10 min.
From each of the compounds produced as described above a sealant layer was produced, which was subjected to a pressure retention test following puncturing of the tyre on which it was applied. The pressure retention test was performed on the sealant layers both before and after they had undergone an ageing process which entailed keeping them in a stove at 100°C for three days according to the ISO 188 standard.
In particular, the test was performed on tyres on which a respective sealant layer produced with a respective compound A- C was applied, in the same conditions. Specifically, the sealant layer is extruded directly on the surface of the inner cavity of the tyre.
The tyres, after being inflated with the same internal pressure, were subjected to the same puncturing conditions with subsequent removal of the object used for the puncturing. For each of the tyres that underwent the test, retention of the pressure after 24h from puncturing (and subsequent removal of the object) was evaluated.
Table II shows the evaluations of the air retention expressed in a form indexed to the result obtained with the sealant layer produced with the compound A before undergoing the ageing process. The higher the indexed value, the better the pressure retention .
TABLE II
Figure imgf000006_0001
From the results of Table II it can be clearly seen that the presence of kraft lignin in the sealant layer (layer relative to the compound of the invention C) not only provides sealing properties comparable to those of the sealant layer commonly used but, at the same time, guarantees the maintenance of said properties also after a period of ageing.
From a comparison between the results for the layer produced with compound B with the results for the layer produced with compound C, it can be seen that it is not the lignin in itself that guarantees the advantages of the present invention; said advantages derive from the exclusive use of kraft lignin, which contributes to giving the present invention the required originality.

Claims

1. A compound for a tyre sealant layer comprising at least one polymer base consisting of an essentially saturated polymer and a filler; said compound being characterized in that said filler comprises kraft lignin.
2. A compound for a sealant layer according to claim 1, characterized in that it comprises 0.5 to 40 phr of kraft lignin .
3. A compound for a sealant layer according to claim 2, characterized in that it comprises at least 5 phr of kraft lignin .
4. A compound for a sealant layer according to one of the previous claims, characterized in that the filler comprises carbon black.
5. A compound for a sealant layer according to one of the previous claims, characterized in that said kraft lignin makes up 0.5 to 100% by weight of the whole filler.
6. A compound for a sealant layer according to claim 5, characterized in that said kraft lignin makes up at least 10% by weight of the whole filler.
7. A tyre sealant layer according to one of the preceding claims, characterized in that said polymer base consisting of an essentially saturated polymer is a halobutyl and/or butyl rubber.
8. A tyre sealant layer produced with the compound according to one of the preceding claims.
9. A tyre comprising a sealant layer according to claim 8.
PCT/IB2016/052794 2015-05-15 2016-05-13 Tyre sealant layer Ceased WO2016185351A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2017559598A JP6781169B2 (en) 2015-05-15 2016-05-13 Tire sealant layer
EP16733192.5A EP3294535B1 (en) 2015-05-15 2016-05-13 Tyre sealant layer
CN201680028244.8A CN107636065B (en) 2015-05-15 2016-05-13 Tyre sealing glue layer
US15/572,813 US10549493B2 (en) 2015-05-15 2016-05-13 Tyre sealant layer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB20150715 2015-05-15
IT102015000015369 2015-05-15

Publications (1)

Publication Number Publication Date
WO2016185351A1 true WO2016185351A1 (en) 2016-11-24

Family

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Family Applications (1)

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PCT/IB2016/052794 Ceased WO2016185351A1 (en) 2015-05-15 2016-05-13 Tyre sealant layer

Country Status (5)

Country Link
US (1) US10549493B2 (en)
EP (1) EP3294535B1 (en)
JP (1) JP6781169B2 (en)
CN (1) CN107636065B (en)
WO (1) WO2016185351A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3137917A1 (en) 2022-07-18 2024-01-19 Upm-Kymmene Corporation Elastomeric composition and articles comprising the composition
WO2024017455A1 (en) 2022-07-18 2024-01-25 Upm-Kymmene Corporation Elastomeric composition and articles comprising the composition

Families Citing this family (8)

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Publication number Priority date Publication date Assignee Title
EP3844222B1 (en) * 2018-08-30 2023-09-06 Active Tools International (HK) Ltd. Tire sealant composition
WO2020140155A1 (en) * 2019-01-04 2020-07-09 Suzano Canada Inc. Lignin-enhanced butyl rubbers
WO2020202125A1 (en) * 2019-04-05 2020-10-08 Bridgestone Europe Nv/Sa Rubber compound for an innerliner
CN110791029B (en) * 2019-11-14 2020-10-27 华南理工大学 A kind of lignin grafted bromobutyl rubber composite material and preparation method thereof
JP7575655B2 (en) * 2020-02-28 2024-10-30 横浜ゴム株式会社 Method and apparatus for manufacturing pneumatic tires
IT202000008497A1 (en) * 2020-04-21 2021-10-21 Bridgestone Europe Nv Sa HIGH WATERPROOF COMPOUND FOR INNERLINER AND METHOD FOR ITS REALIZATION
IT202000016285A1 (en) * 2020-07-06 2022-01-06 Bridgestone Europe Nv Sa HIGHLY STIFF RUBBER COMPOUND FOR TIRE PORTIONS
PL3974470T3 (en) * 2020-09-23 2023-09-04 Suncoal Industries Gmbh Rubber composition for an inner liner for pneumatic vehicle tyres

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WO2001087795A1 (en) * 2000-05-12 2001-11-22 Lignotech Usa, Inc. Set retarders for foamed cements
US7064171B1 (en) * 2005-09-22 2006-06-20 The Goodyear Tire & Rubber Company Non-random styrene-butadiene rubber
EP2433813A1 (en) * 2010-09-28 2012-03-28 The Goodyear Tire & Rubber Company Wire coat compositions for rubber articles
WO2014122622A1 (en) * 2013-02-08 2014-08-14 Bridgestone Corporation Tyre body ply skim
JP2014185223A (en) * 2013-03-22 2014-10-02 Yokohama Rubber Co Ltd:The Rubber composition for tire and pneumatic tire using the same

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JP6114081B2 (en) * 2013-03-22 2017-04-12 横浜ゴム株式会社 Rubber composition for vulcanization bladder and vulcanization bladder for tire using the same

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WO2001087795A1 (en) * 2000-05-12 2001-11-22 Lignotech Usa, Inc. Set retarders for foamed cements
US7064171B1 (en) * 2005-09-22 2006-06-20 The Goodyear Tire & Rubber Company Non-random styrene-butadiene rubber
EP2433813A1 (en) * 2010-09-28 2012-03-28 The Goodyear Tire & Rubber Company Wire coat compositions for rubber articles
WO2014122622A1 (en) * 2013-02-08 2014-08-14 Bridgestone Corporation Tyre body ply skim
JP2014185223A (en) * 2013-03-22 2014-10-02 Yokohama Rubber Co Ltd:The Rubber composition for tire and pneumatic tire using the same

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DATABASE WPI Week 201465, Derwent World Patents Index; AN 2014-R70205, XP002753890 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3137917A1 (en) 2022-07-18 2024-01-19 Upm-Kymmene Corporation Elastomeric composition and articles comprising the composition
WO2024017455A1 (en) 2022-07-18 2024-01-25 Upm-Kymmene Corporation Elastomeric composition and articles comprising the composition
EP4748883A2 (en) 2022-07-18 2026-05-27 UPM-Kymmene Corporation Elastomeric composition and articles comprising the composition

Also Published As

Publication number Publication date
JP2018515660A (en) 2018-06-14
US20180141290A1 (en) 2018-05-24
CN107636065B (en) 2020-03-03
CN107636065A (en) 2018-01-26
US10549493B2 (en) 2020-02-04
EP3294535B1 (en) 2020-07-08
JP6781169B2 (en) 2020-11-04
EP3294535A1 (en) 2018-03-21

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