CA2058901A1 - Pneumatic tire with grey colored sidewall - Google Patents
Pneumatic tire with grey colored sidewallInfo
- Publication number
- CA2058901A1 CA2058901A1 CA 2058901 CA2058901A CA2058901A1 CA 2058901 A1 CA2058901 A1 CA 2058901A1 CA 2058901 CA2058901 CA 2058901 CA 2058901 A CA2058901 A CA 2058901A CA 2058901 A1 CA2058901 A1 CA 2058901A1
- Authority
- CA
- Canada
- Prior art keywords
- rubber
- tire
- carbon black
- sidewall
- component
- 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.)
- Abandoned
Links
Abstract
ABSTRACT OF THE DISCLOSURE
PNEUMATIC TIRE WITH GREY COLORED SIDEWALL
A pneumatic rubber tire having at least one sidewall composed of carbon black reinforced rubber and containing at least one integral, visible grey colored rubber component. In one aspect, the grey colored component may be an annular band or a raised identification.
PNEUMATIC TIRE WITH GREY COLORED SIDEWALL
A pneumatic rubber tire having at least one sidewall composed of carbon black reinforced rubber and containing at least one integral, visible grey colored rubber component. In one aspect, the grey colored component may be an annular band or a raised identification.
Description
~ t3~
PNEUMATIC TIRE WITH GREY COLORED SID~WA~L
FieId This invention relates to a tire with a sidewall with at lea~t a portion thereof having a color contrasting with the color of the tire. The in~rention particularly relate~ to a tire with a grey colcred ~idewall component.
Backgxound Pneumatic rubber tire~ containing carbon black reinforcement are often prepared with a portion of at lea3t one sidewall having a color which contrasts to the color of the remainder of the tire. While various color~ might be considered, u~ually the contrasting color is white.
In particular, such a pneumatic rubber tire i~
often prepared with a white sidewall which i~ usually a black 3idewall having, as a component thereof, an annular white rubber band or white colored raised letters embedded~therein.
For ~he white ~idewall, or raised white letters or other identification, the rubber i3 t~pically compounded with a white-colored pigment such as, for example, titanium dioxide. Carbon black is not normally used in the white sidewal~ because e~en very ~mall amount would di~color the white sidewall rubber.
It is appreciated that the titanium dioxide coloring pigment i~ not considered to be a rubber rein~orcing ingredient for rubber but i8 more in a form of a filler.
In contrast, the typically unwanted carbon bIack is well recognized as being a reinforciny ingredient for rubber, and not simply just a filler pigment or material.
Disclosure and Practice of the Invention In accordance with this in~ention, a pneumatic rubber tire is provided which i9 comprised of a tread, two ~paced beads, and two sidewall element~ extending between said tread and bead elements, and a fabric reinforced carcass supporting 3aid tread and 3idewall, wherein ~aid txead and 3idewalls are composed of carbon black reinforced rubber, an improvement characterized in that at lea~t one of said ~idewalls containing at least one integral, visible grey colored rubber component, wherein said rubber component i9 a sulfur cured rubber containing as ba~ic colorants, based on 100 part~ by weight rubber, about 1 to about 3 parts by weight carbon black pigment about 4 to abou~ ~ parts by weight titanium dioxide, where the weight ratio of carbon black to titanium dioxide i9 in a range o~ about 1:8 to about 3:4.
The carbon black reinforced rubber sidewall i5 considered to be black in color.
Such colorant~ are referred to as basic colorants since it considered that the color of the sidewall band i9 derived primarily from such colorant~ and, thus, dominate its visible color, although it i8 recognized that it i9 likely that the rubber itself and other compounding ingredients contained in the rubber may contribute to its color in a minor way.
In one a~pect, the 3aid grey colored component i3 an annular rubber band.
In another a~pect, the said grey colored-component i9 compo~ed of raised identifyingcharacters, where said character~ may consist of Ietter, numbers and/or insignia.
It i~ to be apprecia~e that the color of the aforesaid cured grey rubber component contained in the ~idewall portion of the tire, absent the titanium dioxide, would typically be black.
By inclusion of titanium dioxide, a grey-colored ~idewall band i9 provided which has a pleasing effect.
It is also perceived that the basic carbon black contributes reinforcement to the grey sidewall rubber which would not be present in a white 3idewall rubber containing titanium dioxide in the absence o~ carbon black.
The pre~ence of carbon black i.3 considered of interest because of the rubber reinforcement quality of carbon black, and such reinforcement effect would be considered~to be important since, significantly, a grPy color i~ imparted to the sidewall rubber a~ being of good stability because of the resistance of the carbon black to migrate within the cured rubber composition.
This is considered to be a particularly significant ~uality of the carbon black as a colorant.
It is, thu~, considered significant that the grey color is apparently primarily obtained with pigment3 instead o~ oil-ba3ed dyes, becau~e the dyes would be expected to migrate to the rubber surface and diminish their colorant effect over time. Therefore, it i~
anticipated that the utilization of the reinforcement type of carbon black adds a degree of stability to the colorant effect for the sulfur cured sidewall rubber.
Contemplated benefits of the carbon black reinforcement and titanium dioxide reduction for a grey colored rubber (e.g. grey colored tire sidewall) which would otherwise be a white colored rubber with increa~ed titanium dioxide and no carbon black are reduced weight because of a lower specific gravity which i~ considered to be an advantage for cost and rolling resistance due to its somewhat lighter weight;
a durability improvemen~ in tear 3eparation resistance a~ would be expected to be evidenced by reductions in curb scuffing and impact separation~.
The aforesaid expected durability improvement is considered to be due primarily to the carbon black reinforcement a~pect of the grey colored rubber, particularly when used as a tire sidewall portion.
Thi3 is considered significant as compared to utilization of a titanium dioxide colored (in absence of carbon black) tire sidewall.
The utilization of the prescribed grey colored sidewall component i8 also con~idered to be useful in pro~iding unique 3tyling distinctne~s to the tire a~
compared to tire3 without such a sidewall component~.
In one aspect, or embodiment, of the invention, a black colored pneumatic tira i5 provided which has at least one ~idewall containing at least one annular groove and at lea~t one annular rib where at least one groove and/or at least one rib cons~itutes ~aid annular, contrastingly grey colored rubber band.
The ~aid contra~tingly grey colored rubber componen~ i~ con~idered as being integral with the ,~
tire sidewall where both it and the remainder of the tire sidewa}l are each compounded with sul~ur curative and co-cured together.
Typicallyj such sidewall component, particularly ~ an annular, grey colored rubber sidewall band, or raised identification, i9 comprised of at lea~t one rubber selected from natural rubber and halobutyl rubber may contain EPDM rubber and/or ~tyrene/butadiene copolymer rubber.
A~ an example, such rubber component may be comprised o~ a mixture of natural rubber and halobutyl rubber or a mixture of natural ~ber, halobutyl rubber and EPDM rubber. Such sidewall rubber mixtures are well known rubber blends often be u~ed for white sidewall mixtures. (For example, see the Vanderbilt 35 Rubber Ha~2~ g78), page 65, "Pa senger Tire Sidewalls-Whitel').
Preferably, the halobutyl rubber i~ selected from at lea~t one of chlorobutyl rubber`and bromobutyl rubber. EPDM rubber i~ an ethylene/propylene/
non-conjugated diene terpolymer rubber. Such terpolymer rubbers are well-known.
The following example i~ intended to exemplify features of the invention. The parts and percentages are by weight unless otherwise indicated.
EXAMPL~ ~
Two sidewall type samples were prepared and cured to which titanium dioxide had been added. The are referred to herein as Exp. A and Exp. ~. Their compositions compri~ed the material~ ~hown in Table 1.
.
:;
' , ::
~ - I
~abla 1 __ . _ _ Part~_by Parts by Weight In~redienta Ex~ A Exp B
__ _ . __ _ Chlorobutyl rubber 60 60 , . _ Natural rubber 35 35 _ _ EPDM rubberl 5 5 _ . . .
Titanium dioxlde 4 4 _ _ _ _ _ Phenolic antidegradant2 1 _ _ _ __ Sulfenamide type 1.75 1.75 accelerator __ _ _ Sulfur 1.2 1.2 I . , . . _ _ _ _ .
: Zinc oxide 5 5 I _ . _ _ ~ 15 Stearic acid 1 1 .
I . . . __ . _ .
: ~ Carbon black (N-660)3 : 1 3 _ _~
Napthenic/paraffinic oil 4 4 ! . - - ; ~ .
Kaolin clay 20 20 I _. . . _ _ __ Phenolfor~aldehyde resin 1.5 1.5 ~ _. _ .
Hard clay 35 35 .~ __ .
: 1. EPDM rubber, an ethylene/propylene/non-conjugated diene terpolymer rubber.
: ~5 ~ 2. Polymeric hindered phenol type.
~,$~
3. An N-660 carbon black reported as having an iodine ab~orption ~umber of 36 and a DBP
(dibutyl phthalate) value of 90.
The Exp. A and Exp~ B cured rubbe:rs had a visibly medium grey color.
Such compounded rubber is extruded to ~onm an extruded rubber strip following which it i~ built into a tire on what is to become its ~idewall and to become an annular grey colored band or raised letters therein and the resulting tire a~sembly ~haped and cured in a ~uitable mold a~ an elevated pressure and temperature condition.
The rubbers had physical properties as shown in the following Table 2.
.~
Ta~le 2 _ _ .
PropertY Exp A Ex~LB
- ~ . _ :~ Modulus, 300~ 3.3 ~ 3.4 : (MPa) _ _ ~longation (~) 520 540 :: : : _ Rebound at 23C 36~ _ . _ :~
Rebound at 100C 6$ 61 . _ _ ~ _ _ The presence of the carbon black is con~idered to , : :. 25 ~ add a reinforcement effect to the titanium dioxide pi$ment~containing rubber.
~ While certain repre~entati~e embodiments and : : : detail~ have been ~hown~or the purpo~e of illustrating the invention, it w~ll be apparent to tho~e skilled in this~art that various changes and modification~ may be made therein without departing from the spirit or ~cope of the invention.
':
PNEUMATIC TIRE WITH GREY COLORED SID~WA~L
FieId This invention relates to a tire with a sidewall with at lea~t a portion thereof having a color contrasting with the color of the tire. The in~rention particularly relate~ to a tire with a grey colcred ~idewall component.
Backgxound Pneumatic rubber tire~ containing carbon black reinforcement are often prepared with a portion of at lea3t one sidewall having a color which contrasts to the color of the remainder of the tire. While various color~ might be considered, u~ually the contrasting color is white.
In particular, such a pneumatic rubber tire i~
often prepared with a white sidewall which i~ usually a black 3idewall having, as a component thereof, an annular white rubber band or white colored raised letters embedded~therein.
For ~he white ~idewall, or raised white letters or other identification, the rubber i3 t~pically compounded with a white-colored pigment such as, for example, titanium dioxide. Carbon black is not normally used in the white sidewal~ because e~en very ~mall amount would di~color the white sidewall rubber.
It is appreciated that the titanium dioxide coloring pigment i~ not considered to be a rubber rein~orcing ingredient for rubber but i8 more in a form of a filler.
In contrast, the typically unwanted carbon bIack is well recognized as being a reinforciny ingredient for rubber, and not simply just a filler pigment or material.
Disclosure and Practice of the Invention In accordance with this in~ention, a pneumatic rubber tire is provided which i9 comprised of a tread, two ~paced beads, and two sidewall element~ extending between said tread and bead elements, and a fabric reinforced carcass supporting 3aid tread and 3idewall, wherein ~aid txead and 3idewalls are composed of carbon black reinforced rubber, an improvement characterized in that at lea~t one of said ~idewalls containing at least one integral, visible grey colored rubber component, wherein said rubber component i9 a sulfur cured rubber containing as ba~ic colorants, based on 100 part~ by weight rubber, about 1 to about 3 parts by weight carbon black pigment about 4 to abou~ ~ parts by weight titanium dioxide, where the weight ratio of carbon black to titanium dioxide i9 in a range o~ about 1:8 to about 3:4.
The carbon black reinforced rubber sidewall i5 considered to be black in color.
Such colorant~ are referred to as basic colorants since it considered that the color of the sidewall band i9 derived primarily from such colorant~ and, thus, dominate its visible color, although it i8 recognized that it i9 likely that the rubber itself and other compounding ingredients contained in the rubber may contribute to its color in a minor way.
In one a~pect, the 3aid grey colored component i3 an annular rubber band.
In another a~pect, the said grey colored-component i9 compo~ed of raised identifyingcharacters, where said character~ may consist of Ietter, numbers and/or insignia.
It i~ to be apprecia~e that the color of the aforesaid cured grey rubber component contained in the ~idewall portion of the tire, absent the titanium dioxide, would typically be black.
By inclusion of titanium dioxide, a grey-colored ~idewall band i9 provided which has a pleasing effect.
It is also perceived that the basic carbon black contributes reinforcement to the grey sidewall rubber which would not be present in a white 3idewall rubber containing titanium dioxide in the absence o~ carbon black.
The pre~ence of carbon black i.3 considered of interest because of the rubber reinforcement quality of carbon black, and such reinforcement effect would be considered~to be important since, significantly, a grPy color i~ imparted to the sidewall rubber a~ being of good stability because of the resistance of the carbon black to migrate within the cured rubber composition.
This is considered to be a particularly significant ~uality of the carbon black as a colorant.
It is, thu~, considered significant that the grey color is apparently primarily obtained with pigment3 instead o~ oil-ba3ed dyes, becau~e the dyes would be expected to migrate to the rubber surface and diminish their colorant effect over time. Therefore, it i~
anticipated that the utilization of the reinforcement type of carbon black adds a degree of stability to the colorant effect for the sulfur cured sidewall rubber.
Contemplated benefits of the carbon black reinforcement and titanium dioxide reduction for a grey colored rubber (e.g. grey colored tire sidewall) which would otherwise be a white colored rubber with increa~ed titanium dioxide and no carbon black are reduced weight because of a lower specific gravity which i~ considered to be an advantage for cost and rolling resistance due to its somewhat lighter weight;
a durability improvemen~ in tear 3eparation resistance a~ would be expected to be evidenced by reductions in curb scuffing and impact separation~.
The aforesaid expected durability improvement is considered to be due primarily to the carbon black reinforcement a~pect of the grey colored rubber, particularly when used as a tire sidewall portion.
Thi3 is considered significant as compared to utilization of a titanium dioxide colored (in absence of carbon black) tire sidewall.
The utilization of the prescribed grey colored sidewall component i8 also con~idered to be useful in pro~iding unique 3tyling distinctne~s to the tire a~
compared to tire3 without such a sidewall component~.
In one aspect, or embodiment, of the invention, a black colored pneumatic tira i5 provided which has at least one ~idewall containing at least one annular groove and at lea~t one annular rib where at least one groove and/or at least one rib cons~itutes ~aid annular, contrastingly grey colored rubber band.
The ~aid contra~tingly grey colored rubber componen~ i~ con~idered as being integral with the ,~
tire sidewall where both it and the remainder of the tire sidewa}l are each compounded with sul~ur curative and co-cured together.
Typicallyj such sidewall component, particularly ~ an annular, grey colored rubber sidewall band, or raised identification, i9 comprised of at lea~t one rubber selected from natural rubber and halobutyl rubber may contain EPDM rubber and/or ~tyrene/butadiene copolymer rubber.
A~ an example, such rubber component may be comprised o~ a mixture of natural rubber and halobutyl rubber or a mixture of natural ~ber, halobutyl rubber and EPDM rubber. Such sidewall rubber mixtures are well known rubber blends often be u~ed for white sidewall mixtures. (For example, see the Vanderbilt 35 Rubber Ha~2~ g78), page 65, "Pa senger Tire Sidewalls-Whitel').
Preferably, the halobutyl rubber i~ selected from at lea~t one of chlorobutyl rubber`and bromobutyl rubber. EPDM rubber i~ an ethylene/propylene/
non-conjugated diene terpolymer rubber. Such terpolymer rubbers are well-known.
The following example i~ intended to exemplify features of the invention. The parts and percentages are by weight unless otherwise indicated.
EXAMPL~ ~
Two sidewall type samples were prepared and cured to which titanium dioxide had been added. The are referred to herein as Exp. A and Exp. ~. Their compositions compri~ed the material~ ~hown in Table 1.
.
:;
' , ::
~ - I
~abla 1 __ . _ _ Part~_by Parts by Weight In~redienta Ex~ A Exp B
__ _ . __ _ Chlorobutyl rubber 60 60 , . _ Natural rubber 35 35 _ _ EPDM rubberl 5 5 _ . . .
Titanium dioxlde 4 4 _ _ _ _ _ Phenolic antidegradant2 1 _ _ _ __ Sulfenamide type 1.75 1.75 accelerator __ _ _ Sulfur 1.2 1.2 I . , . . _ _ _ _ .
: Zinc oxide 5 5 I _ . _ _ ~ 15 Stearic acid 1 1 .
I . . . __ . _ .
: ~ Carbon black (N-660)3 : 1 3 _ _~
Napthenic/paraffinic oil 4 4 ! . - - ; ~ .
Kaolin clay 20 20 I _. . . _ _ __ Phenolfor~aldehyde resin 1.5 1.5 ~ _. _ .
Hard clay 35 35 .~ __ .
: 1. EPDM rubber, an ethylene/propylene/non-conjugated diene terpolymer rubber.
: ~5 ~ 2. Polymeric hindered phenol type.
~,$~
3. An N-660 carbon black reported as having an iodine ab~orption ~umber of 36 and a DBP
(dibutyl phthalate) value of 90.
The Exp. A and Exp~ B cured rubbe:rs had a visibly medium grey color.
Such compounded rubber is extruded to ~onm an extruded rubber strip following which it i~ built into a tire on what is to become its ~idewall and to become an annular grey colored band or raised letters therein and the resulting tire a~sembly ~haped and cured in a ~uitable mold a~ an elevated pressure and temperature condition.
The rubbers had physical properties as shown in the following Table 2.
.~
Ta~le 2 _ _ .
PropertY Exp A Ex~LB
- ~ . _ :~ Modulus, 300~ 3.3 ~ 3.4 : (MPa) _ _ ~longation (~) 520 540 :: : : _ Rebound at 23C 36~ _ . _ :~
Rebound at 100C 6$ 61 . _ _ ~ _ _ The presence of the carbon black is con~idered to , : :. 25 ~ add a reinforcement effect to the titanium dioxide pi$ment~containing rubber.
~ While certain repre~entati~e embodiments and : : : detail~ have been ~hown~or the purpo~e of illustrating the invention, it w~ll be apparent to tho~e skilled in this~art that various changes and modification~ may be made therein without departing from the spirit or ~cope of the invention.
':
Claims (5)
1. A pneumatic rubber tire composed of a tread, two spaced beads, and two sidewall elements extending between said tread and bead elements, and a fabric reinforced rubber carcass supporting said tread and sidewalls, wherein said tread and sidewalls are comprised of carbon black reinforced rubber, an improvement characterized in that at least one of said sidewalls contains at least one integral, visible grey colored rubber component, wherein said rubber component is a sulfur cured rubber containing as basic colorants, base on 100 parts by weight carbon black and about 4 to about 8 parts by weight titanium dioxide pigment, wherein the weight ratio of carbon black to titanium dioxide is in a range of about 1:8 to about 3:4.
2. The tire of claim 1 wherein the rubber for said grey colored rubber component is selected from at least one of natural rubber, halobutyl rubber and EPDM
rubber and may contain styrene/butadiene copolymer rubber.
rubber and may contain styrene/butadiene copolymer rubber.
3. The tire of claim 1, where said carbon black is an N-660 carbon black having an iodine number in the range of about 31 to about 41 and a DBP number in the range of about 85 to about 95.
4. The tire of claim 1 where said grey colored rubber sidewall component is an annular band.
5. The tire of claim 1 where said grey colored rubber sidewall component is a raised identification.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76686491A | 1991-09-27 | 1991-09-27 | |
| US766,864 | 1991-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2058901A1 true CA2058901A1 (en) | 1993-03-28 |
Family
ID=25077749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2058901 Abandoned CA2058901A1 (en) | 1991-09-27 | 1992-01-07 | Pneumatic tire with grey colored sidewall |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2058901A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747087B2 (en) | 1999-05-28 | 2004-06-08 | Michelin Recherche Et Technique S.A. | Rubber composition for a tire, based on diene elastomer and a reinforcing titanium oxide |
| US6835769B2 (en) | 1999-05-28 | 2004-12-28 | Michelin Recherche Et Technique S.A. | Rubber composition for a tire, based on diene elastomer and a reinforcing titanium oxide |
-
1992
- 1992-01-07 CA CA 2058901 patent/CA2058901A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6747087B2 (en) | 1999-05-28 | 2004-06-08 | Michelin Recherche Et Technique S.A. | Rubber composition for a tire, based on diene elastomer and a reinforcing titanium oxide |
| US6835769B2 (en) | 1999-05-28 | 2004-12-28 | Michelin Recherche Et Technique S.A. | Rubber composition for a tire, based on diene elastomer and a reinforcing titanium oxide |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |