GB2211507A - A cross-linkable, more especially a sulphur-vulcanisable, rubber mixture - Google Patents
A cross-linkable, more especially a sulphur-vulcanisable, rubber mixture Download PDFInfo
- Publication number
- GB2211507A GB2211507A GB8824459A GB8824459A GB2211507A GB 2211507 A GB2211507 A GB 2211507A GB 8824459 A GB8824459 A GB 8824459A GB 8824459 A GB8824459 A GB 8824459A GB 2211507 A GB2211507 A GB 2211507A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rubber
- cross
- rubber mixture
- linkable
- sulphur
- 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.)
- Granted
Links
- 229920001971 elastomer Polymers 0.000 title claims description 33
- 239000005060 rubber Substances 0.000 title claims description 33
- 239000000203 mixture Substances 0.000 title claims description 19
- 239000011324 bead Substances 0.000 claims description 9
- 244000043261 Hevea brasiliensis Species 0.000 claims description 8
- 229920003052 natural elastomer Polymers 0.000 claims description 8
- 229920001194 natural rubber Polymers 0.000 claims description 8
- 239000004071 soot Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000012763 reinforcing filler Substances 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000005864 Sulphur Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229920003211 cis-1,4-polyisoprene Polymers 0.000 claims description 2
- 238000000926 separation method Methods 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000018984 mastication Effects 0.000 description 1
- 238000010077 mastication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- -1 oxide Chemical compound 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
Description
2211501 A CROSS-LINKABLE7 MORE ESPECIALLY A SULPHUR-VULCANISABLE, RUBBER
MIXTURE The present invention relates to a crosslinkable, more especially a sulphur-vulcan is able, rubber mixture formed from natural rubber and/or synthetic cis 1,4-polyisoprene and having vulcanising agent additives and a small proportion of reinforcing filler substances which involve soot or silica, said rubber mixture being utilisable as a padding element in its cross-linked, or respectively vulcanised, form and being disposed in the edge regions of the belt and/or bead reinforcing element of a belted tyre.
The known padding element in belted tyres, as claimed in German Patent Specification No. 29 324,290, has a triangular configuration and is disposed at least between the edge of the belt and the profiled tread strip. Such a pad-like intermediate layer may be formed from high proportions of natural rubber, e.g. 90%, and from low proportions of butadiene rubber, e.g. 10%. In order to achieve a necessary, high Shore A hardness of about 800,the rubber mixture is provided with 90% soot or carbon and 5% sulphur. In consequence, the pad-like intermediate layer is harder than the rubber mixture of the tread surface. However, the portion situated underneath the edge of the belt is thus not padded.
According to German Offenlegungsschrift No. 2,328,042, a harder and a softer rubber padding layer are provided so that the portions of the belt which stand a high risk of being damaged, more especially their edge regions, are better protected and padded. One rubber padding layer covers the edge of the belt in a soft rubber layer, and the other rubber padding layer supports this 2 rubber covering layer by means of an upper and lower edge strip formed from a harder rubber mixture. Natural rubber or synthetic polyisoprene or a mixture of these two substances is preferably employed for this purpose. The modulus of elasticity of one padding element is not less than 100 kg/cm2, and the modulus of elasticity of the other padding element is - not less than 35 kg/cm2. The proportion of reinforcing soots is 50 pphr in the case of the hard strip and 30 pphr in the case of the soft pad.
The additionally known rubber bead protection strips. as claimed in German Patent Specification No. 1,605,677, are formed from natural rubber, and this rubber mixture has 25 parts of reinforcing soot relative to 100 parts of rubber. A medium-hard padding strip with a Shore A hardness of about 450 to 550 is thereby achieved. The
2 modulus of elasticity lies in the region of 40 kg/cm Instead of these known rubber strips, a pad-like bead element is incorporated in the bead according to German Offenlegungsschrift No. 2710y446. It is substantially formed from natural rubber, and this rubber mixture contains 25 parts of reinforcing soot and 5 parts of active silica relative to 100 parts of rubber. This bead padding element is thereby provided with a medium hardness and a relatively high rebound elasticity.
The reinforcing filler substances basically have a positive influence on the resistance to tensile strength, but they have the inherent disadvantage that the development of heat increases relatively sharply as a result of their presence. In consequence, the advance of a good tensile strength as the temperature of the tyre increases no longer exists.
According to the object of the invention, belt edge separations and bead separations as a result of an unfavourable tensile strength are to be substantially limited or avoided, in that the pad-like rubber elements are far less involved in the development of heat than is the case with known arrangements.
This object is achieved when the proportion of the reinforcing filler substance in the natural rubber and/or synthetic polyisoprene rubber mixtures ranges from near zero to a maximum of 10 pphr relative to 100 parts or rubber. In this way, a high notch toughness can be achieved which is predominantly suitable for tyre elements, which are in the form of insert plies in the edge region of the belt and/or in the bead region and are produced as padding mixtures. The development of heat with these rubber parts is relatively low and, in addition, their permanent deformation is minimal.
This is illustrated with reference to the example of a sulphurvulcanisable rubber blended mixture which is advantageously utilisable as a vulcanisate in belted tyres in the form of a padding element.
The blended mixture is substantially formed from:
natural rubber 70 parts per 100 parts of rubber polyisoprene 30 parts per 100 parts of rubber HAF soot 4 parts per 100 parts of rubber sulphur 0.5 parts per 100 parts of rubber The vulcanisates additionally contain conventional additives of zinc, oxide, stearic acid, process oily oxidation preventives and vulcanising adjuvants.
The Shore A hardness of the vulcanisate is 440 + 20. The tensile strength is a minimum of 15 MPa. The rebound elasticity which is crucial for the development of heat, is 62% + 2%, measured at an ambient temperature of 220C.
Since the above-mentioned rubber mixture contains relatively little or no soot, it already develops relatively little heat during mastication. The essential feature is that only a small build-up of internal heat occurs in the vulcanisate during dynamic stresses. As a result of the high tensile strength in the region of at least 15 MPa, this rubber mixture is predominantly suitable for protecting the belt edge or bead reinforcing elements, because the strength values do not decrease as a result of an increased influence of heat, but they are maintained at their full minimum level because of the lack of soot or respectively because of a very small amount of filler substance.
4 -
Claims (2)
1. A cross-linkable, more especially a sulphur vulcanisable, rubber mixture formed from natural rubber and/or synthetic cis 1,4-polyisoprene and having vulcanising agent additives and a small proportion of reinforcing filler subst ' ances which involve soot or silica, said rubber mixture being utilisable as a padding element in its cross-linked or respectively vulcanised, form and being disposed in the edge regions of the belt and/or bead reinforcing element of a belted tyre, wherein the proportion of the reinforcing filler substance(s) ranges from zero to a maximum of 10 pphr, pphr representing the parts per hundred parts of rubber.
2. A cross-linkable rubber mixture, as claimed in claim 1, substantially as hereinbefore described and exemplified.
Published 1989 at The Patent 0Mce, State House, 66f71 High Holborn, London WC1R 4TP. Further c0Ples maybe obtained from The Patent OfnCe.
R.I Rt M- rl--- 1r---+ 1MR Imn ---------------------. --- - - -- -
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873736511 DE3736511A1 (en) | 1987-10-28 | 1987-10-28 | NETWORKABLE, INSBES. S-VULCANIZABLE RUBBER MIXTURE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8824459D0 GB8824459D0 (en) | 1988-11-23 |
| GB2211507A true GB2211507A (en) | 1989-07-05 |
| GB2211507B GB2211507B (en) | 1991-10-09 |
Family
ID=6339269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8824459A Expired - Fee Related GB2211507B (en) | 1987-10-28 | 1988-10-19 | A belted tyre incorporating a vulcanisable composition |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH01141927A (en) |
| DE (1) | DE3736511A1 (en) |
| FR (1) | FR2622589A1 (en) |
| GB (1) | GB2211507B (en) |
| IT (1) | IT1230519B (en) |
| SE (1) | SE8803816L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3389488B2 (en) * | 1998-02-10 | 2003-03-24 | 住友ゴム工業株式会社 | Radial tires for heavy loads |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB551410A (en) * | 1940-11-23 | 1943-02-22 | Wingfoot Corp | Vulcanization of rubber |
| GB1010996A (en) * | 1962-09-17 | 1965-11-24 | Monsanto Chemicals | New pyridthione derivatives and their use as vulcanisation accelerators |
| GB1195926A (en) * | 1968-05-08 | 1970-06-24 | Oliver Wallis Burke Jr | Silica Pigment Reinforced Hydrocarbon Rubber Compounded Stocks and Vulcanizates thereof and Processes for Producing the Same. |
| GB1383390A (en) * | 1971-05-06 | 1974-02-12 | Sifrance | Elastomers reinforced with siliceous fillers |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1179801A (en) * | 1968-07-09 | 1970-02-04 | Industriezweiginstitut Gummi U | Mastication Agents for use in the Mastication of Natural Rubber or Synthetic Polyisoprene or their Blends |
| AU3739371A (en) * | 1971-01-09 | 1973-06-28 | Dunlop Australia Limited | Tyres |
| DD150473A1 (en) * | 1980-05-06 | 1981-09-02 | Joachim Waschkowiak | REVERSE-RESISTANT MIXTURE |
| JPS59199732A (en) * | 1983-04-28 | 1984-11-12 | Ube Ind Ltd | Rubber composition for belt cushion |
| JPS641606A (en) * | 1987-06-19 | 1989-01-06 | Sumitomo Rubber Ind Ltd | Motorcycle tire |
-
1987
- 1987-10-28 DE DE19873736511 patent/DE3736511A1/en not_active Ceased
-
1988
- 1988-10-13 IT IT8822286A patent/IT1230519B/en active
- 1988-10-19 GB GB8824459A patent/GB2211507B/en not_active Expired - Fee Related
- 1988-10-25 SE SE8803816A patent/SE8803816L/en not_active Application Discontinuation
- 1988-10-26 FR FR8813963A patent/FR2622589A1/en active Pending
- 1988-10-28 JP JP63271061A patent/JPH01141927A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB551410A (en) * | 1940-11-23 | 1943-02-22 | Wingfoot Corp | Vulcanization of rubber |
| GB1010996A (en) * | 1962-09-17 | 1965-11-24 | Monsanto Chemicals | New pyridthione derivatives and their use as vulcanisation accelerators |
| GB1195926A (en) * | 1968-05-08 | 1970-06-24 | Oliver Wallis Burke Jr | Silica Pigment Reinforced Hydrocarbon Rubber Compounded Stocks and Vulcanizates thereof and Processes for Producing the Same. |
| GB1383390A (en) * | 1971-05-06 | 1974-02-12 | Sifrance | Elastomers reinforced with siliceous fillers |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1230519B (en) | 1991-10-25 |
| SE8803816L (en) | 1989-04-29 |
| IT8822286A0 (en) | 1988-10-13 |
| JPH01141927A (en) | 1989-06-02 |
| FR2622589A1 (en) | 1989-05-05 |
| GB8824459D0 (en) | 1988-11-23 |
| GB2211507B (en) | 1991-10-09 |
| SE8803816D0 (en) | 1988-10-25 |
| DE3736511A1 (en) | 1989-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19921019 |