GB2213825A - A cross-linkable, especially an S-vulcanisable, rubber mixture - Google Patents
A cross-linkable, especially an S-vulcanisable, rubber mixture Download PDFInfo
- Publication number
- GB2213825A GB2213825A GB8729476A GB8729476A GB2213825A GB 2213825 A GB2213825 A GB 2213825A GB 8729476 A GB8729476 A GB 8729476A GB 8729476 A GB8729476 A GB 8729476A GB 2213825 A GB2213825 A GB 2213825A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rubber
- weight
- parts
- rubber mixture
- elastomer
- 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.)
- Withdrawn
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 52
- 239000005060 rubber Substances 0.000 title claims abstract description 39
- 239000000203 mixture Substances 0.000 title claims abstract description 22
- 239000000806 elastomer Substances 0.000 claims abstract description 13
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 10
- 239000004071 soot Substances 0.000 claims abstract description 10
- 239000011324 bead Substances 0.000 claims abstract description 8
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000005864 Sulphur Substances 0.000 claims abstract description 5
- 239000007859 condensation product Substances 0.000 claims abstract description 5
- 230000002787 reinforcement Effects 0.000 claims abstract description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 3
- 239000001257 hydrogen Substances 0.000 claims abstract description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims abstract description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 6
- 229920003052 natural elastomer Polymers 0.000 claims description 6
- 229920001194 natural rubber Polymers 0.000 claims description 6
- 229920001875 Ebonite Polymers 0.000 claims description 5
- 239000002174 Styrene-butadiene Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000007792 addition Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- 229920003986 novolac Polymers 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
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 239000003223 protective agent Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
-
- 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
- B60C15/04—Bead cores
-
- 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
Abstract
The invention relates to a rubber mixture which is formed from an elastomer component, which promotes adhesiveness, and from an easily processable component, at least 10% by weight of styrene-butadiene copolymer with a bound styrene content of approximately 45% by weight, at least 30% by weight of reinforcing soot, and approximately 0.5% by weight of sulphur, and is cross-linkable in the presence of at least 5% by weight of a condensation product formed from a mono- or bivaient hydrogen phenol and formaldehyde. The vulcanisates, which are obtained, have a Shore A hardness of 98 DEG and a modulus of elasticity of 8.8 M Pa, and they are especially suitable for hard tyre components, such as, for example, a bead core reinforcement, bead protective strip or an underplate for tread strips.
Description
A cross-linkable, especially anS-vulcanisable, rubber mixture
The invention relates to a rubber mixture, especially an S-vulcanisable, rubber mixture, comprising at least one elastomer component of high adhesiveness and at least one further elastomer component, reinforcing soot and sulphur, for the production of hard rubber components for a vehicle tyre.
At present, the general travel behaviour of a pneumatic vehicle tyre and its rolling resistance depend partly on the hardness of the rubber of the bead core reinforcement and bead protective strip, on the one hand, and on the hardness of the rubber of the tread strip underplate, on the other hand.
A low rolling resistance and an improved general travel behaviour would be achieved if it were possible to increase the hardness of the rubber portion of the above-mentioned tyre components up to a region around 1000 according to the Shore A scale. An attempt has been made to achieve this by utilising high proportions of reinforcing soots. Such additions, which have to be added in relatively large amounts, present problems insofar as, from an operational point of view, there is a limit, beyond which such a large, required amount of reinforcing soot can no longer be absorbed by the rubber mixture.
According to German Patent Specification No. 36 00 427, it is known to produce a very hard bead core reinforcement from a rubber substance which contains, per 100 parts by weight of rubber, e.g. natural rubber or synthetic diene rubber or a mixture of these rubbers, 40 to 120 parts by weight of soot as well as 5 to 40 parts by weight of a novolac resin and a melamine derivative as the hardener for such resin. According to Table 2, a hardness (HS) of 95 to 98 or 99 is attained (HS hardness according to Japanese specifications).
This arrangement is disadvantageous because of the use of high proportions of soot which lead to operational problems in respect of the production, and because of the use of high proportions of phenol resin, whereby the elasticity expansion of the vulcanisates is substantially impaired.
In addition, the known rubber mixture is not suitable for processing by means of extrusion and calendering.
An object of the invention is to obtain relatively hard rubber portions from rubber mixtures which can be produced from mixtures of blended rubber which contain both components which promote adhesiveness and reinforcing, readily processable rubber components, yet they do not require relatively high proportions of reinforcing soots.
The technical object of the invention resides in producing a ready-to-use rubber mixture, on the basis of a mixture of blended rubber formed from styrene-butadiene copolymers and at least one further elastomer, especially natural rubber, as well as from a relatively low proportion of reinforcing soot and an additional binding agent, such a rubber mixture producing hard rubber portions after the vulcanisation process, especially after the vulcanisation process caused by condensation in the presence of sulphur.
According to the invention, this object is achieved in that there are at least 10 per cent by weight of an elastomer component formed from an emulsion- or solution-polymerised styrene-butadiene copolymer or from a mixture of blended copolymers, where the content of bound styrene in the elastomer molecule is at least 45 per cent by weight, and in that the additional elastomer component is an elastomer which promotes adhesiveness, natural rubber being preferred, in that there are approximately at least 30 per cent by weight of soot, and in that these components are cross-linkable or vulcanisable in the presence of at least 5 parts per 100 parts of rubber of a condensation product formed from a mono- or bivalent hydrogen phenol and formaldehyde.
At least 10 parts per 100 parts of rubber of said condensation product are preferably used.
Rubber portions are to be obtained hereby, which have a
Shore A hardness of at least 980. These are preferably to be used for hard core ring reinforcements as well as hard bead protective strips and for hard underplates of a two-layered tread strip (cap and base).
In a preferred embodiment according to the invention, a vulcanisable mixture of blended rubber substantially comprises
Natural rubber (NR) 60 parts per 100 parts of rubber
Butyl rubber (BR) 20 parts per 100 parts of rubber
Styrene-butadiene
Rubber 1907 (SBR) 20 parts per 100 parts of rubber
Soot (HAF) 65 parts per 100 parts of rubber
Phenol/formaldehyde 20 parts per 100 parts of rubber
Sulphur 0.5 parts per 100 parts of rubber
The vulcanisates contain further, common additions, such as zinc oxide, stearic acid, process oil, anti-oxidation agents, ozone protecting agents and vulcanisation accelerators.
The Shore A hardness of this vulcanisate is 980, and its modulus of elasticity is 8.8 M Pa, measured at ambient temperature.
The mixture of blended rubber is easily processable, contains the reinforcing additions'in a relatively small amount and does not present problems from an operational point of view, and hard rubber vulcanisates of almost 1000 according to the Shore A hardness scale can easily be obtained in a simple manner.
Claims (6)
1. A cross-linkable, especially an S-vulcanisable, rubber mixture, comprising at least one elastomer component of high adhesiveness and at least one further elastomer component, reinforcing soot and sulphur, for the production of hard rubber components for a vehicle tyre, wherein there are at least 10 per cent by weight of a styrene-butadiene copolymer (E-SBR or S-SBR), where the content of bound styrene in the elastomer molecule is at least 45% by weight, and an elastomer which promotes adhesiveness and at least 30 per cent by weight of reinforcing soot, which components are cross-linkable or vulcanisable in the presence of a condensation product amounting to at least 5 parts by weight per 100 parts of rubber formed from a mono- or bivalent hydrogen phenol and formaldehyde.
2. A rubber mixture as claimed in claim 1, wherein the elastomer which promotes adhesiveness is natural rubber.
3. A rubber mixture as claimed in claim 1 or 2, in which at least 10 parts per 100 parts of rubber of the condensation product is used.
4. A rubber mixture as claimed in claim 1, 2 or 3, in which approximately 0.5% by weight per 100 parts of rubber is used.
5. A rubber mixture as claimed in claim 1 or 2, wherein it is used as a bead core ring reinforcement, bead protective strip or underplate of a two-component profile tread strip.
6. A rubber mixture as claimed in any preceding claim, substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863642291 DE3642291A1 (en) | 1986-12-11 | 1986-12-11 | NETWORKABLE, INSBES. SULFUR-VOLCANIZABLE RUBBER MIX |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8729476D0 GB8729476D0 (en) | 1988-02-03 |
| GB2213825A true GB2213825A (en) | 1989-08-23 |
Family
ID=6315941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8729476A Withdrawn GB2213825A (en) | 1986-12-11 | 1987-12-17 | A cross-linkable, especially an S-vulcanisable, rubber mixture |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE3642291A1 (en) |
| FR (1) | FR2608164A1 (en) |
| GB (1) | GB2213825A (en) |
| IT (1) | IT1223272B (en) |
| SE (1) | SE8704937L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0881102A2 (en) * | 1997-05-30 | 1998-12-02 | Sumitomo Rubber Industries Limited | Heavy duty pneumatic tyre |
| WO2001060643A1 (en) * | 2000-02-21 | 2001-08-23 | Pirelli Pneumatici S.P.A. | Motor vehicle tyre with an antiabrasive band capable of reducing its rolling resistance |
| US7025103B2 (en) | 2000-02-21 | 2006-04-11 | Pirelli Pneumatici S.P.A. | Tire for a vehicle wheel having an antiabrasive band |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4163096A1 (en) * | 2021-10-08 | 2023-04-12 | Nokian Renkaat Oyj | A tire comprising a drop shaped bead core and method for the manufacture |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB786131A (en) * | 1955-03-03 | 1957-11-13 | Us Rubber Co | Improvements in tubeless tyre |
| GB947321A (en) * | 1959-08-13 | 1964-01-22 | Dunlop Rubber Co | Improvements relating to tyres for motor vehicles |
| GB1095782A (en) * | 1965-07-05 | 1967-12-20 | Internat Synthetic Rubber Comp | Tyre tread compounds |
| US3526606A (en) * | 1966-11-24 | 1970-09-01 | Asahi Chemical Ind | Compositions comprising a block copolymer,rubber and a process oil |
| US3798190A (en) * | 1966-11-03 | 1974-03-19 | Bridgestone Tire Co Ltd | Rubber blends containing an hydrogenated styrene butadiene random copolymer |
| US4104334A (en) * | 1975-10-09 | 1978-08-01 | Phillips Petroleum Company | Rubber composition |
| US4510291A (en) * | 1982-09-09 | 1985-04-09 | The Yokohama Rubber Co., Ltd. | Rubber compositions for tire treads |
| EP0171935A1 (en) * | 1984-07-18 | 1986-02-19 | Bridgestone Corporation | Tread rubber composition |
| GB2172002A (en) * | 1985-03-05 | 1986-09-10 | Bridgestone Corp | Rubber composition for high-performance tire tread |
| EP0216588A2 (en) * | 1985-09-13 | 1987-04-01 | Bridgestone Corporation | Pneumatic tire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1576424A (en) * | 1976-03-05 | 1980-10-08 | Dunlop Ltd | Beads for pneumatic tyres |
-
1986
- 1986-12-11 DE DE19863642291 patent/DE3642291A1/en not_active Withdrawn
-
1987
- 1987-12-10 SE SE8704937A patent/SE8704937L/en not_active Application Discontinuation
- 1987-12-11 FR FR8717294A patent/FR2608164A1/en active Pending
- 1987-12-11 IT IT22958/87A patent/IT1223272B/en active
- 1987-12-17 GB GB8729476A patent/GB2213825A/en not_active Withdrawn
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB786131A (en) * | 1955-03-03 | 1957-11-13 | Us Rubber Co | Improvements in tubeless tyre |
| GB947321A (en) * | 1959-08-13 | 1964-01-22 | Dunlop Rubber Co | Improvements relating to tyres for motor vehicles |
| GB1095782A (en) * | 1965-07-05 | 1967-12-20 | Internat Synthetic Rubber Comp | Tyre tread compounds |
| US3798190A (en) * | 1966-11-03 | 1974-03-19 | Bridgestone Tire Co Ltd | Rubber blends containing an hydrogenated styrene butadiene random copolymer |
| US3848026A (en) * | 1966-11-03 | 1974-11-12 | Bridgestone Tire Co Ltd | Rubbery vulcanizable composition |
| US3526606A (en) * | 1966-11-24 | 1970-09-01 | Asahi Chemical Ind | Compositions comprising a block copolymer,rubber and a process oil |
| US4104334A (en) * | 1975-10-09 | 1978-08-01 | Phillips Petroleum Company | Rubber composition |
| US4510291A (en) * | 1982-09-09 | 1985-04-09 | The Yokohama Rubber Co., Ltd. | Rubber compositions for tire treads |
| EP0171935A1 (en) * | 1984-07-18 | 1986-02-19 | Bridgestone Corporation | Tread rubber composition |
| GB2172002A (en) * | 1985-03-05 | 1986-09-10 | Bridgestone Corp | Rubber composition for high-performance tire tread |
| EP0216588A2 (en) * | 1985-09-13 | 1987-04-01 | Bridgestone Corporation | Pneumatic tire |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0881102A2 (en) * | 1997-05-30 | 1998-12-02 | Sumitomo Rubber Industries Limited | Heavy duty pneumatic tyre |
| EP0881102A3 (en) * | 1997-05-30 | 2000-11-15 | Sumitomo Rubber Industries Limited | Heavy duty pneumatic tyre |
| WO2001060643A1 (en) * | 2000-02-21 | 2001-08-23 | Pirelli Pneumatici S.P.A. | Motor vehicle tyre with an antiabrasive band capable of reducing its rolling resistance |
| US7025103B2 (en) | 2000-02-21 | 2006-04-11 | Pirelli Pneumatici S.P.A. | Tire for a vehicle wheel having an antiabrasive band |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8722958A0 (en) | 1987-12-11 |
| GB8729476D0 (en) | 1988-02-03 |
| SE8704937D0 (en) | 1987-12-10 |
| SE8704937L (en) | 1988-06-12 |
| FR2608164A1 (en) | 1988-06-17 |
| IT1223272B (en) | 1990-09-19 |
| DE3642291A1 (en) | 1988-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |