CA1056530A - Elastomer blends for tire components - Google Patents
Elastomer blends for tire componentsInfo
- Publication number
- CA1056530A CA1056530A CA217,194A CA217194A CA1056530A CA 1056530 A CA1056530 A CA 1056530A CA 217194 A CA217194 A CA 217194A CA 1056530 A CA1056530 A CA 1056530A
- Authority
- CA
- Canada
- Prior art keywords
- rubber
- blend
- general purpose
- weight
- chlorine
- 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.)
- Expired
Links
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
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
-
- 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
Abstract
ABSTRACT OF DISCLOSURE
Tire flexing components having improved ozone and flex and weather resistance are prepared by blending a general purpose rubber with a chlorinated EPDM
containing about 0.1 to about 4.0 wt.% chlorine. The products so formed are useful for tire components that are subject to severe flexing such as coverstripe and sidewalls.
Tire flexing components having improved ozone and flex and weather resistance are prepared by blending a general purpose rubber with a chlorinated EPDM
containing about 0.1 to about 4.0 wt.% chlorine. The products so formed are useful for tire components that are subject to severe flexing such as coverstripe and sidewalls.
Description
~ 5~iS3C3 1 General purpose rubbers are employed in the manu
2 facture of a wide variety of rubber articles including
3 automotive tires. The term "general purpose rubber" as
4 used in the present specification means the highly un-saturated rubbers of commerce:
6 styrene butadiene rubber (SBR)~ polyisoprene, polybuta-7 diene and natural rubber. While these rubbers exhibit 8 excellent physical properties in their vulcanized state, 9 they are sub~ect to attack by elemen-tal oxygen, especially ozone. The resistance to oxidation and oxidative degen-11 eration may be improved by the addition of an antio~idant 12 or antiozonant at a concomitant increased cost in the rub-13 ber product.
14 It is well known in the art to improve the ozone resistance of such general purpose rubbers by blending the 16 general purpose rubber ~GPR) with an EPDM terpolymer. See, 17 for example, United States Patent 3~492,371.
19 It has been found that the EPDM rubber may be made more compatible with the GPR by brominating the EPDM.
~1 See~ for example, United States Patent 3,524,826. The 22 disclosures of that patent teach that a requirement for 23 operability of the invention is that the EPDM ccntain at 24 least one wt. ~ bromine. The blends so formed have im-proved ozone reslstance in addltion to outstanding physi-26 cal properties.
27 Heretofore, although compositions of GPR and 28 EPDM demonstrated improved ozone resistance, they were 29 lacking in flex properties and therefore had limited ap-plication in tire flexing components.
31 It has surprisingly been discovered that tire 32 ~idewalls and coverstrips having superior ozoneJ flex and ,~ ~
56S3~
weather resistance can be prepared rrom vulcanizates based on binary ~lends of 70-75 wt. ~ of a general purpose rub-ber and 25-30~ of a halogenated EPDM.
The compositions so formed have excellent tensile strengths. These compositions are non-staining and do not require costly antidegradants for stability.
This invention relates to a method for improving the flex, ozone and weather resistance of general purpose rubbers. In particular~ thls invention relates to a blend o~ general purpose rubbers comprising about 70-75~ of a general purpose rubber and 25-30 wt. ~ of a halogenated EPDM. The term l'EPDM" as used in the speciflcation and claims is used in the sense of its definition as found in ASTM D-1418-64, and is intended to mean a terpolymer con-taining ethylene and propylene in the backbone and diene enchainment with residual unsaturation in the sidechains.
Illustrative methods for producing these terpolymers are found in U.S. Patent 3,280,082, British Patent 1,030,989 and French Patent 1,386,600.
More particularly, the present invention concerns a method for improving the weather resistance flex and ozone resistance of tire flexing components prepared from blends of general purpose rubbers, said blends comprising 50 to 60 percent by weight of natural rubber, the balance of said blends being styrene butadiene rubber or polybutadiene rubber which comprises incorporat-ing into the tire flexing composition about 25 to about 40 parts per hundred based on the general purpose rubber blend of a chlorinated EPDM containing about 0.1 to about -4.0 weight percent chlorine.
- ~ -3-., 1C~56~30 The term "tire flexing component" as used in the specification and claims means automotive or truck tire sidewalls, coverstrips or treads.
The preferred polymers contain about 45 to about 80 wt. % ethylene and about 2 to about 10 wt. ~ diene monomer. The balance of the polymer is propylene. Pref-erably, the polymer contains 50 to 60 wt. % ethylene, e.g., 56 wt. ~, and about 2.6 to 4 wt. ~ diene monomer, e.g., 3.3 wt. %. The diene monomer is a non-con~ugated diene. Illustrative of these non-con~ugated diene mono-mers which may be used in the terpolymer (EPDM) are~hexa-diene, dicyclopentadiene, ethylidene norbornene, methylene norbornene, propylidene norbornene and methyltetrahydro-- 3a-~ .
~OS6S3~
1 indene. A typical EPDM is Vistalon 3509 (Exxon Chemical 2 Company, U.S.A.), a polymer having a Mooney Viscosity at 3 212F. of about 90 prepared from a monomer blend having an 4 ethylene content of about 56 wt. ~ and a non-con~ugated diene content (methylene norbornene) of about 2.6 wt. ~.
6 Typical of an EPDM containing ethylidene norbornene as a 7 diene monomer is Vistalon 4608 (Exxon Chemical Company, 8 U.S.A.), a polymer having a Mooney ~iscosity a~ 260F. of 9 about 62, and an ethylene content of about 56 wt. ~.
Methods for preparing halogenated EPDM are well 11 known in the art. The halogenated polymers may be pre-12 pared by reacting an EPDM consisting of ethylene, an alpha-13 olefin other than ethylene~ and a small amount of non-con-14 jugated diolefin with a halogen or halogens, such as chlor-ine or bromine in a chlorinated hydrocarbon such as carbon 16 tetrachlorideg chl~roform, trichloroethylene, tetrachloro-17 ethylene, or monochlorobenzene in the presence or absence 18 of a free radical initiatorg e.g., W light or chemical 19 initiators, etc. When a mixture of chlorine and bromine is used, usually bromination is effected first and chlori-21 nation followsO
22 Illustrative of chlorinated EPDM is chlorinated 23 Vistalon*6505 (Exxon Chemical Company, U.S.A.) having the 24 following properties: ethylene content, 48 wt. ~; ethy-lene norbornene content, 9 wt. ~; and a chlorine content 26 of o.65 wt. ~. The polymer has an iodine number of 18.6 27 and a Mooney Viscosity ML 260 of 67.
28 The chlorinated EPDM usefu~ in the practice of 29 this invention contains ab~ut 0.1 to about 4 wt. % chlorine, more preferably about 0.5 to about 3 wt. ~ chlorine, most 31 preferably about o.65 to about 2.5 wt. ~ chlorlne, e.g.g * Trade Mark - 4 ~
~5653~
about ~7 to about 1.5 wt. % chlorine. As will be seen in the examples, a further preferred range for the chlorinated EPDM is from about O.l to about 0.9 wt. %
chlorine.
-4a-iLOS6S30 1 The chlorinated EPDM blends o~ this invention 2 comprise at least 25 parts per hundred by weight of chlori-3 nated EPDM based on the general purpose rubber. Prefer-4 ably, the composition comprises about 25 to about 40 phr chlorinated EPDM; more preferably about 25 to about 35 phr;
6 most pre~erably about 25 to about 30 phr.
7 The advantages of the instant invention m~y be 8 more readily appreciated by reference to the followlng 9 examples~
EXAMPLE 1 - Halogenation of EPDM
11 A. Typical Solution Halogenation Procedure 12 A 5-1 round bottom ~lask was fitted with stirrer, 13 condenserJ thermometer~ and a tem~erature controller. Nor-14 mal heptane (3 liters) was placed into the ~lask and heated to 80~C. EPDM (150 g) was cut into small pieces~ placed 16 into the flask, and stirred ~or 6-24 hours until completely 17 dissolved. N-halosuccinimide and 0.20 g o~ benzoyl per-18 oxide were added and the mixture was stirred for 4-33 hours 19 to effect the halogenation. The mixture was cooled to ambient and the insoluble by-products allowed to settle.
21 The solution was decanted into a separating funnel and the 22 polymer was precipitated by slowly adding the heptane so-23 lution to 2 volumes of vigorously stirring acetone. A~ter 24 drying to constant weight under vacuum at 40C.~ Ca. 146 g of polymer was recovered.
26 B. Typical Neat Halogenation_Procedure 27 EPDM (100 g), 1,3-dihalo-5,5-dimethylhydantoin 28 (DMK) and (Optionally) O.5 g o~ benzoyl peroxide were 29 thoroughly blended on a cool rubber mill. TAe amount o~
DMH was chosen such that the theoretical amount of reac-31 tive halogen was 0.5-1.0 g. The mixture was then heated 32 between mylar sheets in a hydraulic press at 320~F. for ~051~53~
1 20 minutes to e~fect the halogenation.
2 EXAMPLE 2 - Polymers Pre~ared Via Solution Chlorination 3 ~arious ethylene-propylene-diene monomer poly-4 mers were chlorinated by the solution method~ set forth in Example 1 using N-chlorosuccinimide as the chlorinating 6 agent. The results are shown in Table I~
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~ ~ U'~ ~ O U) O
.f: ~ . o U~ ~
. ~ P
1056~3~
2 Various blends of general purpose rubber were 3 prepared using EPDM) choro-EPDM and halogenated butyl rub-4 ber in an effort to improve the physical properties of the general purpose rubber. All the vulcanizates described in 6 this example were press cured for 30 minute9 at 307F.
7 Formulations used in this example are as follows:
8 ~ s~_e~ hY~E~
9 Elastomer as ~hown Carbon Black ~F~F) 50 11 Plasticizer (Flexon 580 oil) 12 12 Sunolite 127 wax 1.5 13 S~earic acid 14 Zinc oxide 3 Sulfur 0.4 16 Mercaptobenzothiazyl-17 disulfide (MBTS) 0.6 18 Alkylphenol polysulfide 19 (Vul~ac #5) 2~0 ~(~5653~
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0~ ~ ~1 ~ L ~ ~- O
~.9 1 u~ p: OV ~:: O :~ ~ ~1 ~ O 1~
m I E~ V~ ~ ~ o ~ _Io t~ v c~ .~ o o ~ .,1 H O .,1 V p ~ 3 ~ E~ ~ U~ ;3 ~ ~ :C h ~ C~ ~
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td ~ oS ~ 00 o .,`D -lo~ ~ 3 o ~ o o ~ 03 ~a sJ :1 O ~ ~0 r~
~OS6s30 2 ~arious compositions were prepared in a sidewall 3 formulation. The samples were press cured ~or 30 minutes 4 at 307F. The formulation used in the example was as ~ollows: .
6 Comeonent Parts per hundred 7 Elas'comers as shown 8 Carbon Black (GPF~ 60 9 ~lexon 580 Plast~cizer Oil 30 Ssearic acid 2 11 Zinc ox~ d~ 3 12 Sul~ur O 8 13 MBTS O . 8 14 Vult2c #5 1.5 ~05653~
, ~ O O ~ ~
O ~ I~r~ ou~ >
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E~ ~ ~ n O
C~ ~D I~ i~u~ ~
~ ~ ~ ~ ., P o~o ~
~ ~ ~ D
P~ ~ ~ ~ ^ .c o tq o ~ . ~ ',;~
o ~ t C~.~ o C~ ~ ~I ~ ~ t~
0~ 0 ~1 Cd .. , ~ ~ o Ql ~ ~ ~V~ ~ ~
o~ c-. ~ I
Q ~ ~ ~ 0 0_~
P~:J tn o o ~- u J- ~ Q~ ~d ~
~1 0 ~ rl I ~I-r~ O
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O ~ ~ ,~ ~ G~ P~ ~ O
~:00$~ ~ oO ~ E~
otr~~ ~ 5 C~ ~ O :~
,~ I V~ ~ 0 0 ~ O ~ r-l~ 1 ~
o q) ~1 0 O ~ e~ ^ ~ rl ~: ~ O
n ~ W 3 ~ ~ ~ ~ o :E:
; i~S6S3~
1 Run 5 of Table II and Run 10 of Table III show 2 the current state of the art in that in order to achieve 3 the outstanding properties shown, 45 phr of specialty 4 elastomer is required. The composition o~ this inven-tion on the other hand (Runs 1, 2, 6 and 7) requires only 6 25-30 phr to achieve the same results, resulting in ob-7 vious economics.
6 styrene butadiene rubber (SBR)~ polyisoprene, polybuta-7 diene and natural rubber. While these rubbers exhibit 8 excellent physical properties in their vulcanized state, 9 they are sub~ect to attack by elemen-tal oxygen, especially ozone. The resistance to oxidation and oxidative degen-11 eration may be improved by the addition of an antio~idant 12 or antiozonant at a concomitant increased cost in the rub-13 ber product.
14 It is well known in the art to improve the ozone resistance of such general purpose rubbers by blending the 16 general purpose rubber ~GPR) with an EPDM terpolymer. See, 17 for example, United States Patent 3~492,371.
19 It has been found that the EPDM rubber may be made more compatible with the GPR by brominating the EPDM.
~1 See~ for example, United States Patent 3,524,826. The 22 disclosures of that patent teach that a requirement for 23 operability of the invention is that the EPDM ccntain at 24 least one wt. ~ bromine. The blends so formed have im-proved ozone reslstance in addltion to outstanding physi-26 cal properties.
27 Heretofore, although compositions of GPR and 28 EPDM demonstrated improved ozone resistance, they were 29 lacking in flex properties and therefore had limited ap-plication in tire flexing components.
31 It has surprisingly been discovered that tire 32 ~idewalls and coverstrips having superior ozoneJ flex and ,~ ~
56S3~
weather resistance can be prepared rrom vulcanizates based on binary ~lends of 70-75 wt. ~ of a general purpose rub-ber and 25-30~ of a halogenated EPDM.
The compositions so formed have excellent tensile strengths. These compositions are non-staining and do not require costly antidegradants for stability.
This invention relates to a method for improving the flex, ozone and weather resistance of general purpose rubbers. In particular~ thls invention relates to a blend o~ general purpose rubbers comprising about 70-75~ of a general purpose rubber and 25-30 wt. ~ of a halogenated EPDM. The term l'EPDM" as used in the speciflcation and claims is used in the sense of its definition as found in ASTM D-1418-64, and is intended to mean a terpolymer con-taining ethylene and propylene in the backbone and diene enchainment with residual unsaturation in the sidechains.
Illustrative methods for producing these terpolymers are found in U.S. Patent 3,280,082, British Patent 1,030,989 and French Patent 1,386,600.
More particularly, the present invention concerns a method for improving the weather resistance flex and ozone resistance of tire flexing components prepared from blends of general purpose rubbers, said blends comprising 50 to 60 percent by weight of natural rubber, the balance of said blends being styrene butadiene rubber or polybutadiene rubber which comprises incorporat-ing into the tire flexing composition about 25 to about 40 parts per hundred based on the general purpose rubber blend of a chlorinated EPDM containing about 0.1 to about -4.0 weight percent chlorine.
- ~ -3-., 1C~56~30 The term "tire flexing component" as used in the specification and claims means automotive or truck tire sidewalls, coverstrips or treads.
The preferred polymers contain about 45 to about 80 wt. % ethylene and about 2 to about 10 wt. ~ diene monomer. The balance of the polymer is propylene. Pref-erably, the polymer contains 50 to 60 wt. % ethylene, e.g., 56 wt. ~, and about 2.6 to 4 wt. ~ diene monomer, e.g., 3.3 wt. %. The diene monomer is a non-con~ugated diene. Illustrative of these non-con~ugated diene mono-mers which may be used in the terpolymer (EPDM) are~hexa-diene, dicyclopentadiene, ethylidene norbornene, methylene norbornene, propylidene norbornene and methyltetrahydro-- 3a-~ .
~OS6S3~
1 indene. A typical EPDM is Vistalon 3509 (Exxon Chemical 2 Company, U.S.A.), a polymer having a Mooney Viscosity at 3 212F. of about 90 prepared from a monomer blend having an 4 ethylene content of about 56 wt. ~ and a non-con~ugated diene content (methylene norbornene) of about 2.6 wt. ~.
6 Typical of an EPDM containing ethylidene norbornene as a 7 diene monomer is Vistalon 4608 (Exxon Chemical Company, 8 U.S.A.), a polymer having a Mooney ~iscosity a~ 260F. of 9 about 62, and an ethylene content of about 56 wt. ~.
Methods for preparing halogenated EPDM are well 11 known in the art. The halogenated polymers may be pre-12 pared by reacting an EPDM consisting of ethylene, an alpha-13 olefin other than ethylene~ and a small amount of non-con-14 jugated diolefin with a halogen or halogens, such as chlor-ine or bromine in a chlorinated hydrocarbon such as carbon 16 tetrachlorideg chl~roform, trichloroethylene, tetrachloro-17 ethylene, or monochlorobenzene in the presence or absence 18 of a free radical initiatorg e.g., W light or chemical 19 initiators, etc. When a mixture of chlorine and bromine is used, usually bromination is effected first and chlori-21 nation followsO
22 Illustrative of chlorinated EPDM is chlorinated 23 Vistalon*6505 (Exxon Chemical Company, U.S.A.) having the 24 following properties: ethylene content, 48 wt. ~; ethy-lene norbornene content, 9 wt. ~; and a chlorine content 26 of o.65 wt. ~. The polymer has an iodine number of 18.6 27 and a Mooney Viscosity ML 260 of 67.
28 The chlorinated EPDM usefu~ in the practice of 29 this invention contains ab~ut 0.1 to about 4 wt. % chlorine, more preferably about 0.5 to about 3 wt. ~ chlorine, most 31 preferably about o.65 to about 2.5 wt. ~ chlorlne, e.g.g * Trade Mark - 4 ~
~5653~
about ~7 to about 1.5 wt. % chlorine. As will be seen in the examples, a further preferred range for the chlorinated EPDM is from about O.l to about 0.9 wt. %
chlorine.
-4a-iLOS6S30 1 The chlorinated EPDM blends o~ this invention 2 comprise at least 25 parts per hundred by weight of chlori-3 nated EPDM based on the general purpose rubber. Prefer-4 ably, the composition comprises about 25 to about 40 phr chlorinated EPDM; more preferably about 25 to about 35 phr;
6 most pre~erably about 25 to about 30 phr.
7 The advantages of the instant invention m~y be 8 more readily appreciated by reference to the followlng 9 examples~
EXAMPLE 1 - Halogenation of EPDM
11 A. Typical Solution Halogenation Procedure 12 A 5-1 round bottom ~lask was fitted with stirrer, 13 condenserJ thermometer~ and a tem~erature controller. Nor-14 mal heptane (3 liters) was placed into the ~lask and heated to 80~C. EPDM (150 g) was cut into small pieces~ placed 16 into the flask, and stirred ~or 6-24 hours until completely 17 dissolved. N-halosuccinimide and 0.20 g o~ benzoyl per-18 oxide were added and the mixture was stirred for 4-33 hours 19 to effect the halogenation. The mixture was cooled to ambient and the insoluble by-products allowed to settle.
21 The solution was decanted into a separating funnel and the 22 polymer was precipitated by slowly adding the heptane so-23 lution to 2 volumes of vigorously stirring acetone. A~ter 24 drying to constant weight under vacuum at 40C.~ Ca. 146 g of polymer was recovered.
26 B. Typical Neat Halogenation_Procedure 27 EPDM (100 g), 1,3-dihalo-5,5-dimethylhydantoin 28 (DMK) and (Optionally) O.5 g o~ benzoyl peroxide were 29 thoroughly blended on a cool rubber mill. TAe amount o~
DMH was chosen such that the theoretical amount of reac-31 tive halogen was 0.5-1.0 g. The mixture was then heated 32 between mylar sheets in a hydraulic press at 320~F. for ~051~53~
1 20 minutes to e~fect the halogenation.
2 EXAMPLE 2 - Polymers Pre~ared Via Solution Chlorination 3 ~arious ethylene-propylene-diene monomer poly-4 mers were chlorinated by the solution method~ set forth in Example 1 using N-chlorosuccinimide as the chlorinating 6 agent. The results are shown in Table I~
105~iS3~) . ~ ~ ~
. . . ..
.~ ~ ~ C~l ~
!
~ ~ C~
. ~1 ~ . .
, ~ ~ ~D .
o H ~ :IC O O O O
- ' ,~
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P~ ~
, bO
u~ n C
~., ~ ~i æ æ tJ
~ ~ U'~ ~ O U) O
.f: ~ . o U~ ~
. ~ P
1056~3~
2 Various blends of general purpose rubber were 3 prepared using EPDM) choro-EPDM and halogenated butyl rub-4 ber in an effort to improve the physical properties of the general purpose rubber. All the vulcanizates described in 6 this example were press cured for 30 minute9 at 307F.
7 Formulations used in this example are as follows:
8 ~ s~_e~ hY~E~
9 Elastomer as ~hown Carbon Black ~F~F) 50 11 Plasticizer (Flexon 580 oil) 12 12 Sunolite 127 wax 1.5 13 S~earic acid 14 Zinc oxide 3 Sulfur 0.4 16 Mercaptobenzothiazyl-17 disulfide (MBTS) 0.6 18 Alkylphenol polysulfide 19 (Vul~ac #5) 2~0 ~(~5653~
~ ~I ."
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~ ~ 'U~ o ~000 ~c~
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~OS6s30 2 ~arious compositions were prepared in a sidewall 3 formulation. The samples were press cured ~or 30 minutes 4 at 307F. The formulation used in the example was as ~ollows: .
6 Comeonent Parts per hundred 7 Elas'comers as shown 8 Carbon Black (GPF~ 60 9 ~lexon 580 Plast~cizer Oil 30 Ssearic acid 2 11 Zinc ox~ d~ 3 12 Sul~ur O 8 13 MBTS O . 8 14 Vult2c #5 1.5 ~05653~
, ~ O O ~ ~
O ~ I~r~ ou~ >
,. ~ _, .
U~ o ~ o~
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~ ~ ~ ~ ., P o~o ~
~ ~ ~ D
P~ ~ ~ ~ ^ .c o tq o ~ . ~ ',;~
o ~ t C~.~ o C~ ~ ~I ~ ~ t~
0~ 0 ~1 Cd .. , ~ ~ o Ql ~ ~ ~V~ ~ ~
o~ c-. ~ I
Q ~ ~ ~ 0 0_~
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; i~S6S3~
1 Run 5 of Table II and Run 10 of Table III show 2 the current state of the art in that in order to achieve 3 the outstanding properties shown, 45 phr of specialty 4 elastomer is required. The composition o~ this inven-tion on the other hand (Runs 1, 2, 6 and 7) requires only 6 25-30 phr to achieve the same results, resulting in ob-7 vious economics.
Claims (10)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for improving the weather resistance flex and ozone resistance of tire flexing components prepared from blends of general purpose rubbers, said blends comprising 50 to 60 percent by weight of natural rubber, the balance of said blends being styrene butadiene rubber or polybutadiene rubber which comprises incorporating into the tire flexing composition about 25 to about 40 parts per hundred based on the general purpose rubber blend of a chlorinated EPDM containing about 0.1 to about 4.0 weight percent chlorine.
2. The method of claim 1 wherein the chlorinated EPDM is incorporated into the composition at about 25 to about 35 phr.
3. The method of claim 2 wherein the chlorinated EPDM is incorporated into the composition at about 25 to 30 phr.
4. The method of claim 1 wherein the chlorine content is about 0.5 to about 3 wt. %.
5. The method of claim 4 wherein the chlorine content is about 0.65 to about 2.5 wt. %.
6. The method of claim 5 wherein the chlorine content is about 0.7 to about 1.5 wt. %.
7. The method of claim 1 wherein the chlorine content is about 0.1 to about 0.9 weight percent.
8. An automobile tire hauing a sidewall formed from a blend of general purpose rubbers, said blend comprising from 50 to 60 percent by weight of natural rubber, the balance of said blend being styrene butadiene rubber or poly-butadiene rubber and containing about 25 to about 40 parts per hundred based on the blend of general purpose rubbers of a chlorinated EPDM containing 0.1 to 4 weight percent chlorine.
9. An automobile tire having a cover strip formed from a blend of general purpose rubbers, said blend comprising from 50 to 60 percent by weight of natural rubber, the balance of said blend being styrene butadiene rubber to polybutadiene rubber and containing about 25 to about 40 parts per hundred based on the general purpose rubber of a chlorinated EPDM containing 0.1 to 4 weight percent chlorine.
10. A composition useful in preparing a tire flexing component such as a sidewall or a cover strip comprising a mixture of:
(a) a blend of highly unsaturated rubbers comprising 50 to 60 percent by weight of natural rubber, the balance being styrene-butadiene rubber or polybutadiene rubber; and (b) about 25 to about 40 parts per hundred by weight based on the highly unsaturated rubber blend of a chlorinated EPDM containing 0.1 to 4 weight percent chlorine.
(a) a blend of highly unsaturated rubbers comprising 50 to 60 percent by weight of natural rubber, the balance being styrene-butadiene rubber or polybutadiene rubber; and (b) about 25 to about 40 parts per hundred by weight based on the highly unsaturated rubber blend of a chlorinated EPDM containing 0.1 to 4 weight percent chlorine.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44431374A | 1974-02-21 | 1974-02-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1056530A true CA1056530A (en) | 1979-06-12 |
Family
ID=23764386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA217,194A Expired CA1056530A (en) | 1974-02-21 | 1974-12-31 | Elastomer blends for tire components |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1056530A (en) |
| FR (1) | FR2262073B1 (en) |
| GB (1) | GB1491030A (en) |
-
1974
- 1974-12-31 GB GB5614174A patent/GB1491030A/en not_active Expired
- 1974-12-31 CA CA217,194A patent/CA1056530A/en not_active Expired
-
1975
- 1975-02-04 FR FR7503417A patent/FR2262073B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2262073A1 (en) | 1975-09-19 |
| GB1491030A (en) | 1977-11-09 |
| FR2262073B1 (en) | 1981-09-18 |
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