JPH0641374A - Epdm/epr composition comprising filled with material for white sidewall tire compound - Google Patents

Abstract

PURPOSE:To provide white sidewall compound, comprising a blend of EPDM with EPR, a thermoplastic polymeric additive for increasing the crystallinity and a non-black mineral filler and applicable to the black sidewall of a tire without using an adhesive. CONSTITUTION:The compound comprises (A) 100 pts.wt. polymer blend containing (1) at least about 10-95 pts.wt. polyolefin produced from monomers having at least two carbon atoms and a mixture thereof and having about 0.5-13wt.% crystallinity and (2) about 5-90 pts.wt. thermoplastic polymeric additive for increasing the crystallinity (e.g. polyethylene), (B) a filler in an amount of about 20-200 pts.wt. based on 100 pts.wt. polymer blend and (C) a processing aid and a mixture thereof in an amount of about 20-150 pts.wt. based on 100 pts.wt. polymer blend.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates generally to compositions for white sidewall tire compounds. White sidewall tire compounds include ethylene-propylene-diene terpolymers, herein referred to as EPDM, ethylene-propylene copolymers, herein referred to as EPR, or other similar olefin type polymers. Or a blend thereof with a thermoplastic polymeric additive for increasing crystallinity, such as polyethylene or polypropylene homopolymers and ethylene / octene and ethylene / butene copolymers. There is. More particularly, the compound contains a non-black mineral filler as a substitute for carbon black. Frequently, to prevent contaminants such as oils and antioxidants (ie, p-phenylenediamines) from migrating into the white sidewall compound, a stain shielding skim (sometimes 20-30 mils thick) is used. ) Is inserted at the interface of the black and white sidewall compounds. The white sidewall compound is
With heat and some pressure and without solvent or water based adhesives, it is glued directly to the dirt shield skims (optional) or black sidewalls of bare tires or pneumatic tires. In addition, a thin thermoplastic film can be provided between the white sidewall compound and the stain shield skim or the black sidewall to improve the adhesion between them.

[0002]

BACKGROUND OF THE INVENTION Tires with white or decorative sidewalls are generally manufactured by making white sidewalls in-situ, applying a thin black coating strip thereon, and vulcanizing the tire. There is. The purpose of the coated piece is to protect the white sidewall during handling and vulcanization so that it does not discolor upon contact with the tire's contaminated black components or mold remnants. After the tire has been vulcanized and cooled, the coated piece is buffed to expose the white sidewall. Nevertheless, the white sidewalls are relatively soft and may become contaminated, marked or abraded during transportation with other tires and during and after general handling prior to their installation in a vehicle. is there.

Accordingly, white sidewall compounds having improved deformation resistance and resistance over common compounds and white sidewalls that can be applied to tires after vulcanization thereby eliminating the need for strips and subsequent stripping operations. The need for is recognized in the art. The white sidewall composition can also be applied to vulcanized tires without the use of an adhesive system. An example of an unvulcanized applique that is vulcanized with a green tire is described in US Pat. No. 5,058,647, and an example of an unvulcanized applique applied to a vulcanized tire is US Pat. 5,049,22
0. However, neither patent teaches the use of stiffer EPDM / EPR based compounds.

Various EPDMs with high crystallinity are known, but their use in white sidewalls is unknown. US Pat. No. 5,086,121, for example, relates to thermoplastic olefin compositions. In this composition, a polyolefin component such as high density polyethylene and two rubber components are provided, only one of which is vulcanized by a vulcanization package. For example, the two rubbers used can include halogenated butyl rubber and EPDM. Only certain halogenated butyl rubbers are vulcanized by the addition of certain vulcanization packages, such as the zinc oxide system. The second rubber component remains unvulcanized. The preferred EPDM is a highly crystalline terpolymer. Thus, this patent discloses unvulcanized EPDM in the presence of a polyolefin such as high density polyethylene. It is also noted that such compositions provide improved physical properties, such as improved tensile strength.

US Pat. No. 4,036,912 discloses a thermoplastic polymer blend of, for example, EPDM polymer and crystalline polypropylene. The formulation has relatively high tensile strength and high structural integrity. No vulcanizing agents or crosslinkers were used to achieve these properties. The polymers are mixed in the range of about 5 parts to about 200 parts polypropylene to 100 parts EPDM by weight.

US Pat. No. 3,941,859 discloses highly crystalline EPDM polymers which have been blended with polyolefins to produce blends having excellent tensile strength. No vulcanization package is used.
Similarly, U.S. Pat. No. 3,919,358 also discloses crystalline EPDM blended with a polyolefin.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a circumferentially adaptable white sidewall in the groove of a black sidewall of a tire which has been vulcanized using heat and some pressure.

It is another object of the present invention to provide a white sidewall compound containing a blend of EPDM and EPR with a thermoplastic crystallinity increasing polymeric additive and a non-black mineral filler. is there.

It is a further object of the present invention to provide a white sidewall compound that can be applied to the black sidewalls of a tire without the use of an adhesive.

Yet another object of the present invention is to provide a thermoplastic layer of material which can be inserted between the white and black sidewalls of a tire to apply the former thereto.

It is another object of the present invention to provide a method for applying a tire white sidewall to a black sidewall without the use of an adhesive.

A black sidewall portion is defined which defines a circumferential groove into which the at least partially vulcanized and non-black mineral filled thermoplastic polymeric object composition is adhered. It is yet another object of the invention to provide a tire having.

Generally, the present invention is prepared from (A) 100 parts by weight, (1) at least about 10-95 parts by weight of monomers having at least 2 carbon atoms and mixtures thereof. A polymer blend comprising a polyolefin having a crystallinity of about 0.5 to about 13% by weight, and (2) about 5-90 parts by weight of a thermoplastic crystallinity increasing polymeric additive. , (B) about 20-200 parts by weight per 100 parts of the polymer blend, a filler selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) 100 parts. Solvent- or water-based adhesive prepared from a thermoplastic polymeric polymeric composition of matter comprising about 20-150 parts by weight per weight of said polymer blend of processing aids and mixtures thereof. General vulcanized without using The present invention relates to a non-black mineral-filled white sidewall compound that can adhere to tire sidewalls.

Also provided is a tire which is at least partially vulcanized and has sidewalls, to which a non-black mineral filled thermoplastic white sidewall compound is applied to form white sidewalls, And bonding the white sidewalls to the tire sidewalls under sufficient pressure and heat to provide acceptable adhesion without the use of solvent or water based adhesives. Also included in the present invention is a method of applying a thermoplastic, non-black, mineral-filled white sidewall compound to conventional vulcanized tire sidewalls.

The present invention also relates to the sidewall portion and 100 parts by weight of (A) adhered thereto, (1) at least about 10-95 parts by weight of monomers having at least 2 carbon atoms and those. Produced from a mixture of
5-a polyolefin having a crystallinity of about 13% by weight,
And (2) a polymer blend comprising (b) about 5-90 parts by weight of a thermoplastic crystallinity increasing polymeric additive.
About 20-200 parts by weight of filler per 100 parts of the polymer blend, selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) 10.
About 20-150 parts by weight per 0 part of the polymer formulation;
Also provided is a tire having a non-black, mineral-filled, white sidewall compound made from a thermoplastic polymeric composition of matter comprising processing aids and mixtures thereof.

At least one or more of the above objects that will be apparent to those skilled in the art are described in more detail with reference to the following specification.

[0017]

As described above, the white sidewall compound used in the present invention is made of EPDM, EPR.
Alternatively, it contains a blend of other similar olefinic polymers made from monomers having at least 2 carbon atoms. The word EPDM is ASTM-D-1418-85
It is used in the sense of its definition as found in and is meant to mean a terpolymer of ethylene, propylene and diene monomers having residual unsaturation of the diene in the side chain. ing. An exemplary method for making such a terpolymer is U.S. Pat. No. 3,280,0.
82, the disclosure of which is hereby incorporated by reference. The preferred polymers have about 50 to about 95 wt% ethylene and about 0 to about 12 wt% diene, the balance of the polymer being propylene or other similar olefin type polymers.

The diene monomer used in making the EPDM terpolymer is preferably a non-conjugated diene. Examples of non-conjugated dienes that can be used are dicyclopentadiene,
Alkyldicyclopentadiene, 1,4-pentadiene, 1,4-hexadiene, 1,5-hexadiene, 1,
4-heptadiene, 2-methyl-1,5-hexadiene, cyclooctadiene, 1,4-octadiene, 1,7
-Octadiene, 5-ethylidene-2-norbornene,
5-n-propylidene-2-norbornene, 5- (2-
Methyl-2-butenyl) -2-norbornene and the like. A typical EPDM has a Mooney viscosity (ML) of about 52.
/ 4,125 ° C.), Vistalon ^R MD-744 (Exxon Chemical is a terpolymer having a 60/40% by weight of ethylene / propylene (E / P) ratio and 2.7 wt% of the unsaturated Company).

Amorphous EPDMs or EPRs
EPDMs and E having high crystallinity as opposed to those
The former can also be used, although PRs are particularly useful and preferred. Examples include the Loyaren ^R 37
5 (Uniroyal Chemical Company) and Epsin ^R 5508 and Epsin ^R MDE-249 (Copolymer Rubber and Chemical Corporation)
Is included. Royaren ^R 375 is about 50.8 Mooney viscosity (ML / 4,125 ℃), 75 /25 % by weight of E
/ P ratio and about 2.0% by weight unsaturation (dicyclopentadiene) and a weight average molecular weight of about 190,000. Epsin ^R 5508 is about 55.6 Mooney viscosity (ML / 4,125 ℃), 73 /27 % by weight of E /
It has a P ratio and an unsaturation of about 3.7% by weight. About 5
Mooney viscosity of 6 (ML / 4, 125 ° C), 71/29
Wt% E / P ratio and about 1.7 wt% unsaturation (5-
It is also possible to use epsin ^R MDE-249 an experimental terpolymer having a ethylidene-2-norbornene). In making a white sidewall compound for practicing the present invention, a Mooney viscosity of about 53 (ML / 4, 12) was used.
5 ° C.), an ethylene / propylene (E / P) ratio of about 60/40% by weight, about 2.7% by weight of unsaturated (5-ethylidene-2-norbornene) and a weight average molecular weight of about 360,000. Vistalon ^R M which is EPDM rubber
D-744 (Exon Chemical Company) is also useful. A more complete discussion of such polymers is in our present pending application, US patent application Ser. No. 07 /
594,457, the subject matter of which is hereby incorporated by reference.

The word EPR refers to ASTM D-1418.
Used in the sense of its definition as found in -85, and means a copolymer of ethylene and propylene. The preferred copolymer contains about 30-95% by weight ethylene, with the balance being 100% by weight propylene. A typical EPR is about 75
Vistaron ^R 719 with an E / P ratio of / 25% by weight
(Exon Chemical Company).

Copolymers of ethylene and butene are also useful in the production of the white sidewall compound of the present invention. This particular copolymer has about 82 wt% ethylene, and the balance to make 100% is butene. A typical ethylene / butene copolymer is GERS-1085 (Union Carbide Corporation) having an Mw measured by GPC of at least about 221,000. Other similar olefinic polymers (eg, ethylene / octene copolymers) can also be used in the practice of this invention. Generally speaking, about 2% by weight
Polyolefins having a higher crystallinity and selected from the group consisting of polyolefins prepared from monomers having at least 2 carbon atoms can be used. For discussion purposes here, EPDM, EPR
In addition, any reference to similar olefin polymers includes any polyolefin of the present invention.

To be useful as a white sidewall compound in the present invention, EPDM has a crystallinity of from about 0.5 to about 13% by weight from the ethylene component, at least about 30,000 to about 120,000. Mn measured by GPC, and Mw measured by GPC of at least about 100,000 to about 375,000.
It is preferable to have Similarly, EPR has a crystallinity (ethylene) of from about 0.5 to about 13% by weight and a GP of at least about 30,000 to about 120,000. A high degree of crystallinity to give a white sidewall compound that does not require vulcanization and does not require an adhesive such as those based on any type of solvent to adhere the white sidewall of the tire to the black sidewall ( EPDM with at least 2% by weight) and weight average molecular weight (Mw = 100,000)
Or, they have found that EPR is suitable.

In addition to the above polyolefins, about 0.5
Amorphous polyolefins having crystallinity up to wt% and made from monomers having at least 2 carbon atoms can be used. To have utility in the present invention, polyolefins having crystallinity less than 2 wt% are listed in various amounts in Table I.
It may be blended with one or more polymeric additives for increasing the thermoplastic crystallinity. Also, for each discussion,
This component of the polymer composition is herein EPDM, EP
It may be referred to as R or another polyolefin.

Polymeric additives for increasing thermoplastic crystallinity which may be used in the polymer blends of the present invention include the group consisting of polyolefin homopolymers, random copolymers and block copolymers. Selected from. Homopolymers include
Includes polyethylene and polypropylene. Irregular copolymers include poly (ethylene-co-propylene)
Copolymers are included. Block copolymers include poly (ethylene-b-octene) and poly (ethylene-b
-Butene) copolymers are included. It is also possible to use mixtures of the abovementioned polymers, or approximately 10-95 parts by weight using a homopolymer and compounded with about 5-90 parts by weight of a crystallinity increasing polymeric additive. It is also possible to make a total of 100 parts of the polymer including the EPDM or EPR polymer.

Representative examples of commercially available thermoplastic crystallinity increasing polymeric additives that can be blended with EPDM, EPR or other similar polyolefins are set forth in Table I at peak melting temperatures and The material is shown with a differential scanning calorimeter (DSC) crystallinity percentage at a heating rate of 10 ° C. min.

[0026]

[Table 1] Table I Polymer Additives for Increasing Thermoplastic Crystallinity Ethylene Homopolymers Temperature, ° C * % Crystallinity Polywax 2000 ^a 128 89.9 Polywax 3000 ^b 121 93.2 LDPE 722 ^c 112 39.1 LDPE 132 ^d 109 27.7 LDPE 640 ^e 113 39.9 LDPE 768 ^f 119 45.8 LDPE CG-2523 ^g 111 53.6 HDPE 12065 ^h 134 66.8 HDPE 62013 ⁱ 131 61.2 Petrolite E-3020 ^j 116 85.9 Polypropylene homopolymers Yeast bond D-7682-109S ^k 153 4.7 A-FAX 500 ^l 155 5.8 Ethylene / propylene copolymers RLX-020 ^m 152 35.8 Ethylene / Octene copolymers Attan 4003 ⁿ 123 36.9 Tan 4001 ^o 124 35.0 Dowlex 2047A ^p 124 39.8 Dowlex 2045 ^q 124 42.2 Dowlex 2038 ^r 127 53.6 Dowlex 2027 ^s 113 41.5 Ethylene / butene copolymer GERS-1085 ^t 71 2.3 *) Peak melting temperature a) High melting point polyethylene (Petrolite) having a molecular weight of about 2000 b) High melting point polyethylene (Petrolite) having a molecular weight of about 3000 c) Low density polyethylene resin, density 0.916 ( Dow·
Chemical) d) Low density polyethylene resin, density 0.919 (Dow
Chemical) e) Low density polyethylene resin, density 0.922 (Dow.
Chemical) f) Low density polyethylene resin, density 0.930 (Dow
Chemical) g) Low density polyethylene resin, density 0.923 (Dow
Chemical) h) High Density Polyethylene Resin, Density 0.94 (Dow Chemical) i) High Density Polyethylene Resin, Density 0.94 (Dow Chemical) j) Petroleum-Derived Oxidized Carbonization with Oxidation of 22 Hydrogen (Petrolite) k) Amorphous polypropylene (Eastman Chemical) l) Amorphous polypropylene (Highmont USA Inc.) m) Ethylene / propylene copolymer (2% ethylene) with a molecular weight of about 400,000. Phillips petroleum) n) ethylene-octene copolymer, density 0.905 (Dow Chemical) o) ethylene-octene copolymer, density 0.912 (Dow Chemical) p) ethylene-octene copolymer, density 0.917 (Dow Chemical) q) ethylene-octene copolymer, density 0.920 (Dow Chemical) Cal) r) ethylene-octene copolymer, density 0.935 (Dow Chemical) s) ethylene-octene copolymer, density 0.941 (Dow Chemical) t) ethylene-octene copolymer (about 82%) Ethylene), density 0.884 (Union Carbide Corporation) for increasing thermoplastic crystallinity when the polymer blend contains a relatively large amount of polyolefins having a crystallinity of less than 2% by weight. Polymeric additives are necessary or even more important. However, even if the selected polyolefin has a crystallinity greater than 2% by weight, the thermoplastic crystallinity-increasing polymeric additive of the present invention is resistant to deformation, abrasion, resistance, stain resistance, etc. To serve. The composition used to make the white sidewall compound is 100 parts by weight of EPDM, EPR or other similar type olefinic polymers containing a mixture of two or more types, all discussed below. Included are essentially added thermoplastic crystallinity increasing polymeric additives, fillers and processing oils, and optionally blends with other ingredients.

With regard to non-black mineral fillers initially, suitable fillers are hard clays, soft clays, chemically modified clays, calcined clays, mica, talc, alumina trihydrate. , Calcium carbonate, titanium dioxide, amorphous precipitated hydrated silica, silicates, silicon dioxide and mixtures thereof. These fillers are
It may be partially or completely replaced by "black" fillers, namely carbon black and other related petroleum-derived materials.

The four basic types of clay are commonly used with reinforcing fillers for rubber elastomers. Different types of clay can be air floated, water washed,
Included are those that have been calcined and those that have been surface treated or chemically modified.

Air-floated clay is the cheapest and most widely used. They are divided into two general groups and offer a wide range of strengthening and fillability. Hard clay is about 20 per 100 parts of polymer
An amount of -200 parts (phr), preferably about 65-175
Used in an amount of phr. Commercially available hard clay can be used. The preferred air-floated hard clays used are Splex ^R , Baden R ^R , LGB ^R all commercially available from JM Hoover Corporation / 10 air-floated soft clays.
It is used in an amount of about 20 to about 200 parts per phr of polymer (phr), preferably in an amount of about 75-175 phr. The preferred air-floated soft clay used is J.
Paragon ^R , Hi-White R ^R , and K-78 ^R , commercially available from M. Hoover Corporation.

Washed clay is generally considered a semi-reinforcing filler. This particular type of clay is further refined with respect to particle size by the water-fractionation method. This method allows the production of clay within controlled particle size ranges. The preferred range of washed clay is very similar to the preferred amount of air-floated soft clay described above.
Some examples of suitable water washed clays are Polyfill ^R DL, Polyfill ^R F, Polyfill ^R FB, Polyfill ^R HG-9.
0, polyfill ^R K and polyfill ^R XB and is included, all of which are commercially available from J.M. Huber Corporation.

The third type of clay includes calcined clay. Clays generally contain about 14% water of hydration, and most of this can be removed by calcination. The amount of bound water removed determines the degree of calcination. The preferred range of calcined clay is very similar to the preferred amount of air-floated soft clay described above. Some examples of suitable calcined clays include Polyfill ^R 40, Polyfill ^R 70 and Polyfill ^R 80, all of which are commercially available from JM Huber Corporation.

The fourth type of clay includes chemically modified reinforcing clays. Modifying the surface of individual particles with a multifunctional silane binder imparts crosslinking capacity to the clay. 100 chemically modified clay
It is used in an amount of about 20 to about 200 parts per part of polymer (phr), preferably in an amount of about 60-175 phr. Generally, the specific gravity of most clays is about 2.60 at 25 ° C. Suitable chemically modified clays are commercially available from JM Hoover Corporation and they include Nucap ^R 100, Nucap ^R 200, Nucap ^R 190, Nucap ^R 290, Nuloc ^R 321. , Nuloc ^R 390 and Polyfill ^R 36
8 are included.

Other useful non-black fillers include amorphous silica (silicon dioxide). Silicas are generally classified as wet-step hydrated silicas because they are produced by a chemical reaction in water from which they precipitate as ultrafine spherical particles. The upper useful range is limited by the high viscosity imposed by this type of filler. A few examples of commercially available silicas which may be used, high everything is manufactured by PPG Industries - Sil ^R 215, high - sill ^R 2
33, Hi-Sil ^R EP and Siren ^R D.
Also, a number of useful commercial grades of various silicas are available from JM.
Available from Hoover Corporation.

The finely ground calcium carbonate is present in an amount of about 20 to about 200 parts per 100 parts of polymer (phr).
It is preferably used in an amount of about 35-90 phr. Calcium carbonate generally has a specific gravity of about 2.71, and Harwick Chemicals, JM Hoover
It is commercially available from a number of suppliers including Corporation, Georgia Marble, Genster Stone Products and Omia Incorporated.

Titanium dioxide is present in an amount of about 5 to about 80 parts (phr) per 100 parts of polymer, preferably about 10-50.
Used in an amount of phr. Both rutile and anatase titanium dioxide can be used, but the rutile form is preferred and it has a specific gravity of, for example, 3.90 and is commercially available from the DuPont Company. is a white powder Chipyua ^R R-960
Such products are included.

Other commercially available non-black mineral fillers that can be used to carry out the present invention include talc (magnesium silicate), mica (a mixture of sodium and potassium aluminum silicate) and alumina trihydrate. Is included.

The optional components include, for example, a small amount of EPDM.
Other elastomers (eg, butyl elastomer, neutralized sulfonated EPDM, neutralized sulfonated butyl) as well as common amounts of other common reagents such as zinc oxide, stearic acid, antioxidants , Anti-ozone agents, flame retardants, and the like.

With regard to processing aids, it is included to improve the processing performance of the composition (ie to reduce mixing time and increase sheet production rate),
And it includes processing oils and waxes. Processing oil in an amount in the range of about 20 to about 150 phr processing oil, preferably in an amount in the range of about 60 to about 135 phr,
included. Suitable processing oils are paraffinic oils such as Sunpal 150, available from Sun Oil Company,
Is. Other petroleum-derived oils, including naphthenic oils, are also useful.

Mixing ingredients using an internal mixer (eg, Banbury mixer), extruder, and / or two-roll mill, or other mixer suitable for producing a viscous, relatively uniform mixture. Can be mixed. When using a Type B Banbury internal mixer in a preferred manner, a dry or powdered material such as a filler is added first, followed by the liquid process oil, and finally the polymer. It can also be referred to as the top-down mixing technique).

During tire construction, a 20-30 mil film of unvulcanized pollution control skim feedstock is applied over the black sidewalls in the region of the grooves along the white sidewall perimeter. When the tire is properly vulcanized, the white sidewall grooves that characterize a 20-30 mil film of pollution control skim are buffed prior to application of the white sidewall compound. The white sidewall compound can be extruded using heat and some pressure into a circumferential groove located in the black sidewall region of the tire. The ideal temperature of the white side wall extrudate is about 205 ° -3
Between 20 ° F (96 ° -160 ° C). The mineral-filled white sidewall compound is self-adhesive without the use of solvent or water based adhesives. Also, due to the thermoplastic behavior of the mineral-filled EPDM / EPR compositions of the present invention, no sulfur-accelerator vulcanization package is required. In addition, the thermoplastic EPDM / EPR compounds are expected to produce excellent ozone denaturation and climate resistance. As mentioned above, the composition may include EPDM, EPR or other polyolefins, as well as blends thereof.

The present invention may also use thermoplastic films to improve the compatibility between the EPDM or EPR white sidewall compounds described herein and the black sidewalls. The thin thermoplastic film of the present invention comprises a polyolefin prepared from a monomer or monomers having 2 to about 8 carbon atoms, such as polyethylene, polypropylene, polybutene, polyoctene, and ethylene-vinyl acetate copolymers and Blends thereof may be included.
In general, film thicknesses can range between about 2 and about 20 mils, although higher thicknesses can be used and are therefore not excluded.

The thickness mils and peak melting temperature (measured using a differential scanning calorimeter) for the two high density polyethylene films used to practice the invention are shown in Table II.

[0043]

Table II Thermoplastic film lining thickness (mil) Tm, ° C (by DSC) High molecular weight polyethylene film P150 ^a 6 139.4 P550 ^a 20 140.5 a) Stamilan UH ^R (Engineering Plastics-DSM ) Three white sidewall compounds within the scope of the disclosure were made to demonstrate the practice of the invention. The selected EPDM polymers include, epsin ^R MDE-249, and Vistalon ^R
MD-744 was included. The properties of each polymer are shown in Table III below.

[0044]

TABLE 3 TABLE III EPDM polymer properties research epsin ^R Vistalon ^{R MDE-249 MD-744 ML} / 4,125 ℃ 56 53 ethylene content, wt% 71 60 crystallinity, wt% 9.3 <1 Tg, ° C (according to DSC) -47.5-56.4 Tm, ° C (according to DSC) 38.3 41.6 Unsaturation,% 1.7 2.7 Unsaturation type ENB ^a ENB ^a Mn 106,000 73,200 Mw 332,900 360,400 Mn / Mw ratio 3.14 4.92 a) 5-Ethylidene-2-norbornene A white sidewall compound of the present invention was prepared according to the composition shown in Table IV below. Parts and percentages are by weight unless otherwise stated. These examples are provided for the purpose of further illustrating the nature of the invention and should not be considered as a limitation on the scope thereof.

[0045]

TABLE 4 TABLE IV white sidewall Compound Compound No. 1 2 3 Vistalon ^R MD-744 60 - - epsin ^{R MDE-249 - 60 60 HDPE} -12065 40 40 - Dow Rex ^R 2047A ^a - - 40 Nukappu ^R 190 Clay 20 20 20 TiO ₂ 10 10 10 Sunpar ^R 150 Oil ^b 11 11 11 Ultra Marine Blue ^c 0.30 0.30 0.30 Antioxidant ^d 1 1 1 Total 142.3 142.3 142.3 a) Ethylene-octene Polymer b) Flash Point at 495 ° C, Refractive Index of 1.4805 and 0.2.
Paraffinic processing oil having a specific gravity of 8740 c) Inorganic blue pigment produced by heating sulfur, clay, alkali and a reducing agent at high temperature. Colorant for rubber products, especially white sidewall compounds.

D) 2,2 'Methylene-bis- (4-methyl-6-tertiary-butylphenol) In order to demonstrate the practice of this invention, a white sidewall compound is adhered to the bottom in Table V below. A conventional sulfur vulcanized black sidewall compound according to the composition shown was prepared.

[0047]

[Table 5] Table V Black sidewall raw material for passenger cars Polybutadiene 60 Natural rubber 40 FEF carbon black (ASTM N-550) 55 Zinc oxide 3 Stearic acid 1.50 Santoflex 13 ^a 3.33 Wax compound 3.0 Antioxidant ^b 1.5 naphthenic processing oil 13.0 resin oil compound ^c 4.0 rubber masterbatch 184.33 cristex sulfur 2.62 santocure NS ^d 0.80 total 187.75 a) N- (1,3-) Dimethylbutyl) -N'-phenyl-
Paraphenylenediamine b) Polymerized 2,2,4-trimethyl-1,2-dihydroquinoline c) Blends of petroleum hydrocarbons and tar oil rosin d) N-tert-butyl-2-benzothiazyl-
Sulfonamide It is also commonly used in tires with white sidewalls to protect against pollution caused by leaching due to antioxidants, aromatic processing oil colors, etc. that adversely affect the white sidewall compounds in the tire. Target. The pollution control skim feed composition is not new to the present invention and a typical formulation is shown in Table VI below. The white sidewall compound of the present invention was also adhered to the pollution shielding material.

[0048]

Table 6 Table VI Contamination shielding skim raw material Skim raw material Natural rubber 30 Chlorobutyl 25 EPDM 20 Polybutadiene 25 HAF black (ASTM N-330) 30 Naphthenic processing oil 10 Wax compound 3 Alkylphenol formaldehyde resin 2 Rubber masterbatch 145.0 Rubber Masterbatch 145.0 Zinc oxide 3.0 Stearic acid 1.20 Cristex Sulfur 2.62 Altax-MBTS ^a 0.70 Brutac 710 ^b 1.17 Total 153.69 a) Benzothiazyl disulfide b) Alkylphenol disulfide, Sulfur content 29.4-
31.8% by weight, specific gravity 1.18 Thermoplastic white sidewall compound provided in Table IV,
Tubing or extruding into circumferential grooves located in the black sidewalls of the vulcanized tire, preferably at temperatures above 132 ° C. The grooves themselves are formed in the black sidewalls during vulcanization of the tire. Before applying the thermoplastic white sidewall material,
The groove should be buffed, preferably using a wire brush. The buffing removes the demolding residue as well as surface "blooms" or sulfur, oils, etc. that may reduce the level of adhesion between the white and black sidewalls. Buffing also increases the amount of surface area between the thermoplastic white sidewalls and the vulcanized tire. To minimize discoloration of the white sidewalls, the pollution shielding skim shown in Table VI (approximately 2
A thickness of 0-30 mils) can be applied to the black sidewalls during the manufacture of unvulcanized tires. The width and depth of the circumferential groove can be varied.

Referring to the drawings, a typical tire is generally designated by the numeral 10 in FIG. Tire 1
0 is typically pneumatic, and thread 100,
Includes thread reinforced belts 12, 13, body ply 14, liner 15, bead 16, first bead apex 18, bead tip 19, second bead apex 20, sidewall 21 and shoulder 22. It should be understood that the invention is not limited by any particular tire construction or to pneumatic tires as opposed to bare tires, as the tire design can vary.

In the manufacture of tires with white sidewalls in general, it is common to provide a stain shielding skim feedstock whose purpose is to process oils, antioxidants that will discolor or stain the white sidewalls. And suppressing the migration of other components. The pollution control skim feedstock 23 is depicted in FIG. 2 for such purpose, and is otherwise a common ingredient.

The tire 1 has a white side wall, which is generally 25.
For zero application, a circumferential groove 26 is provided as depicted in FIG. The circumferential groove 26 may be formed by buffing the sidewall 21 in the area depicted by arrow A in FIG. 2 after the tire has been vulcanized, or it may be vulcanized during vulcanization. Can also be used in a properly designed tire mold. The dimensions of the circumferential groove 26 can vary depending on the amount of white sidewalls desired for modern styles and appearance. Generally, it has a width of about 0.5-1 inch (1.25-2.5 cm) as indicated by W and about 0.1875 inch (0.48) as indicated by D.
The depth of the contamination shielding skim raw material 23 does not exceed the thickness of the contamination shielding skim raw material 23. Typical dimensions are 0.75 inch (1.91 cm) wide and 0.1 inch (0.25 cm) deep.

The white sidewalls 25 are applied to the circumferential grooves 26 in the unvulcanized state by any suitable means such as extrusion. Preferably, a thin layer or sheet of thermoplastic film 28 is applied between the circumferential groove 26 and the white sidewall 25 to improve adhesion between them and provide additional stain resistance. Nevertheless, film 28
Is optional.

After the application of the white sidewall 25, it is about 8-2.
Heat at about 133 ° -160 ° C for about 5-30 seconds under a slight pressure on the order of 00 psi. This application of heat and pressure is sufficient to bond the white sidewalls to the stain shielding skim feedstock without the need to use solvent or water based adhesives, but the use of either adhesive It should not be considered as a means for doing anything outside the scope of the invention. Sidewall 25 is preferably about 90 mils thick, designated T, and provides an outer surface 29 slightly below outer surface 30 of sidewall 21, as depicted in FIG. Of course, the thickness of the side wall 25 can be changed,
And, it may be more than the depth of the white side wall 26.

The composition of the white sidewall 25, which is harder than the conventional rubber compound used for the white sidewall, results in a more resistant sidewall with improved resistance to abrasion, scuffing, edging, damage and the like. To be Moreover, since the white sidewalls are applied after the tire has been built, the use of a covering strip to protect the common white sidewalls during fabrication and vulcanization is omitted along with the need for subsequent removal.

Although the practice of this invention is preferably used after vulcanization during the manufacture of freshly manufactured tires, it is also within the scope of this invention to subject the tire to less than overall vulcanization. is there. Further, the method of the present invention is not limited to freshly manufactured tires, as long as the circumferential grooves 26 are buffed in existing tires for conversion to white sidewall tires. In this way, application can be made at the point of sale in response to immediate demand. For such off-plant applications, the method of the present invention has recently been practiced by applying the thermoplastic white sidewall compound in the form of pieces or in a fully molded annulus. If desired, thermoplastic films can be used and the bond can be increased by application of heat in an amount of about 133 ° -160 ° C. and pressure of about 8 to about 200 psi.

Application of white sidewalls according to the method of the present invention is illustrated in FIG.
Is shown in the block diagram of FIG. 1, which includes as a first step providing a tire that is at least partially vulcanized and has sidewall boxes 31. A circumferential groove is then formed in the sidewall of the tire during vulcanization of box 32. A non-black mineral-filled thermoplastic white sidewall compound is placed on the black sidewall of the tire in a box 33.
Applied by. Application includes the optional step of applying a thin sheet of thermoplastic film by box 34 between the tire's white sidewall compound and the black compound.

As discussed above, the preferred mode of application is the circumferential direction of the tire by box 32 before vulcanization or by buffing the circumferential groove in the black side wall after vulcanization by box 35. The step of providing a circumferential groove in the black sidewall located at.

After application of the white sidewall compound and optional thermoplastic film to the circumferential groove, the method involves bonding the white sidewall with heat and some pressure by the box 36. When the white sidewall compound is cooled to room temperature, the tire is ready for use.

Thus, the physical construction of a typical tire to which the white sidewalls of the present invention have been applied and the method of application have been described, but the adhesion obtained without the use of solvent or water based adhesives. Test results indicating the degree are reported.

In the examples below, the white sidewall compound of Example 1 in Table IV was applied to the black sidewall compound of Table V with or without a layer of thermoplastic film between them. The exemplified compositions are provided for the purpose of further illustrating the nature of the invention and are not intended to limit the scope thereof. Table IV
The white sidewall compound of was also applied to the pollution shielding skim compound of Table VI. Adhesion test pads of various raw materials were prepared for peel adhesion testing according to the following steps.

Detailed Peel Adhesion Test Process A thermoplastic white sidewall compound and vulcanized stain shield skim are required to make an adhesion test pad containing a 6 × 6 inch rubber reinforced layer according to the following process. I went to

Approximately 7 to make rubber-to-rubber adhesion test pads using a 1.10 x 20 inch two roll mill.
A 5 mil thick stain shield skim or about 25 mil thermoplastic white sidewall sheet was produced.

2. Unreinforced pollution shielding skim 75 mil 6
Approximately 35 x 6 inches in positive pressure mold at 149 ° C
Vulcanized over a period of minutes.

3. Wire brush buffing a 6x6 inch unreinforced sheet of vulcanized pollution control skim using a 1.5 inch wide and 10 inch diameter wire brush installed on a floor model vacuum cleaner. did.

4. A 25 mil thick 6 x 6 inch sheet of unreinforced thermoplastic white sidewalls was applied to the buffed surface of a vulcanized unreinforced stain shield skim. A combination of thermoplastic white sidewalls and a buffed and vulcanized pollution control skim is coated with a layer of Mylar film and placed in a metal vulcanization type cavity (cavity dimensions: 6x6x0.100 inches). It was

Very low molding pressure (<200 psi-press platen contact) with a bond pad consisting of a 5.75 mil buffed vulcanized unreinforced stain shield skim and a 25 mil layer of unreinforced thermoplastic white sidewalls. And about 14
Pressure was applied in a 6x6x0.100 inch vulcanization mold using a vulcanization temperature of 9 ° C for about 6 minutes. The adhesion test pad was allowed to equilibrate for 24 hours before testing.

6. A number of 6 inch long, 1 inch wide test samples were prepared for peel adhesion testing using a clicker machine and a 1 inch wide die.

7. Testing machine: Model 1130 Instron ^R Universal Tester - a constant speed separation type of test machine of the jar. The machine was equipped with a suitable grip to allow the sample to be clamped tightly and not to slip during the test.

AST a 8.1 inch wide sample at 2 inches per minute (both crosshead and chart speed).
It was tested using the adhesion test shown in MD-413 (Mechanical Method). Peel adhesion strength at room temperature (ie 23
C.) and optionally 38 ° and 50 ° C.
Was measured at. The test sample was preheated to an elevated temperature for 15 minutes before testing.

9. Adhesive strength, peel adhesive strength (pound /
Inch) = pound force × sample width.

In Table VII, the black sidewalls of Table V in both vulcanized and unvulcanized form as well as the white sidewall formulation in Example 1 of Table VI with and without high density polyethylene liner were used. Combined together. The thickness of the polyethylene liner itself could be anywhere from 5-18 mils.
The heat and pressure conditions were as specified.

[0072]

Table VII Table VII Black Sidewall / White Sidewall Adhesion Study Example No. 1 2 3 4 5 6 Black Sidewall Vulcanized Vulcanized Vulcanized Unvulcanized Unvulcanized Vulcanized * HDPE Liner ----- 10 mil 10 mil 20 mil --- White sidewall test pad manufacture (1) (2) (3) (3) (4) (2) (1) Leister manual heating gun-heat setting number 9 (peak hot air temperature, 442 ° C) Was used to bond the white sidewall to the black sidewall.

(2) Compression molded (no liner)-
<200 psi platen pressure (3) compression molded with 10 mil HDPE liner − <200 psi platen pressure (4) compression molded with 20 mil HDPE liner − <200 psi platen pressure * wire brush as above Buffed Pad Surface Table VIII reports peel adhesion properties for Examples Nos. 1-6.

[0074]

Table VIII Table VIII Peel adhesion between black sidewall and white sidewall compound Example No. 1 2 3 4 5 6 23 ° C. raw material to raw material bond lb / in 0.6 0.9 0.9 1.3>38> 35 > 23 Tire damage (A) (A) (A) (B) (B) (D) Raw material-to-raw material adhesion at 38 ° C. ^(a) lbs / inch --- --- --->18>33> 11 Tire damage −−−−−− (B) (B) (C) Adhesion of raw material to raw material at 50 ° C. ^(a) pound / inch −−−−−−>4.5>25> 4 Tire damage --- -(C) (D) (C) (a) Sample preheated for 15 minutes before testing (A) = Separation between black sidewall / white sidewall compound (B) = some in black sidewall compound Torn. The strip of black sidewalls adhered to the HDPE liner and the white sidewalls showed some stretching and necking during the test.

(C) = White sidewall compound stretched and broke during the initial peel adhesion test. Essentially no tearing occurred at the black sidewall / white sidewall interface.

(D) = White sidewall compound experienced significant elongation and necking prior to separation at the black sidewall / white sidewall interface. At the broken interface, a thin black film of black sidewall compound adhered to the white sidewall compound.

Next, in Table IX, a vulcanized stain shield skim from Table VI of a 75 mil thick 6 × 6 inch slab was mechanically wire brush buffed and individually vulcanized. Very low molding pressure (<6 min
200 psi-press platen contact) and about 149 ° C
Molded into three white sidewall compounds in Table IV at temperatures of No polyethylene film liner was used. Peel adhesion tests at temperatures in the range of 23 ° C-50 ° C were conducted and are reported in Table IX.

[0078]

Table IX Table IX Peel adhesion between pollution control skim and white sidewall compound Example No. 1 2 3 Raw material to raw material adhesion at 23 ° C. lb / inch>10.2>15.6> 18.2 Tire failure (E) (E) (E) Adhesion of raw material to raw material at 38 ° C. ^(a) Pound / inch>5.4>8.3> 12.1 Tire damage (E) (E) (E) Raw material at 50 ° C. Adhesion to raw materials ^(a) lb / inch>3.8>5.7> 9.3 Tire breakage (E) (E) (E) (a) Sample preheated for 15 minutes before test (A) = Prior to separation at the dirt-shielding skim / white sidewall interface, the mineral-filled white sidewall compound experienced considerable elongation and some necking. At the broken interface, a thin black film of stain-blocking skim adhered to the surface of the white sidewall compound. In some cases, a small portion of the white sidewall compound was observed on the surface of the stain shield skim.

In conclusion, the semi-crystalline thermoplastic EPD
Use of a mineral filled white sidewall compound containing a blend of M, EPR or other olefin type polymers and a thermoplastic crystallinity increasing polymeric additive sufficient heat and some pressure It should be apparent from the above examples and specification that it provides a white sidewall composition that can be adhered to the surface of the black sidewall of a vulcanized tire with and without an adhesive. Fully acceptable peel adhesion, including either white side walls and wire black buffed passenger side black side walls or stain shield skim compounds, occurs at test temperatures in the range 23 ° -50 ° C without the polyethylene liner. It was After the peel adhesion test, a small portion (piece) of the white side wall adhered to either the black side wall for passenger cars or the stain shielding skim. In addition, a thermoplastic film can be inserted between the white and black sidewalls to further improve adhesion.

The present invention is directed to the disclosure of the particular types of thermoplastic films or EPDMs exemplified herein, other typical EPDM, EPR or other olefin type polymers provided herein, or herein. It is not limited by the disclosure of the polymer for increasing crystallinity, and the examples thereof are merely provided for explaining the practice of the present invention. Those of ordinary skill in the art will be aware of other thermoplastic films, or other EPDs, in accordance with the disclosure provided above.
Other similar olefin polymers, including M, EPR or ethylene and butene and ethylene and octene copolymers could be readily selected. Similarly, the invention need not be limited to the particular thermoplastic crystallinity increasing polymeric additives, fillers and processing aids illustrated or amounts thereof. Finally, although the present invention does not require the use of solvents or adhesives between the white sidewall composition and the black sidewall, the use of any of them is a means of defeating the practice of the invention. Should not be considered.

Accordingly, any of the modifications disclosed herein can be readily determined without departing from the scope of the invention disclosed and described herein. Moreover, the scope of the invention should include all modifications and variations that fall within the scope of the appended claims.

The main features and aspects of the present invention are as follows.

1. (A) 100 parts by weight, (1) at least about 10-
95 parts by weight of polyolefins having a crystallinity of about 0.5 to about 13% by weight prepared from monomers having at least 2 carbon atoms and mixtures thereof, and (2) about 5-90. A polymer blend comprising, by weight, a thermoplastic crystallinity increasing polymeric additive; (B) about 20-200 per 100 parts of the polymer blend.
Parts by weight of a filler selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) about 20-150 per 100 parts of the polymer blend.
A conventional vulcanization without the use of solvent or water based adhesives made of parts by weight of the thermoplastic polymeric composition of an object comprising processing aids and mixtures thereof. Non-black mineral-filled white sidewall compound capable of adhering to tire sidewalls.

2. The thermoplastic crystallinity increasing polymeric additives include polyethylene and polypropylene homopolymers, poly (ethylene-co-propylene) disordered copolymers, and poly (ethylene-b-octene) and poly.
A non-black mineral-filled white sidewall compound as described in 1 above, selected from the group consisting of (ethylene-b-butene) copolymers.

3. The non-black, mineral-filled white sidewall compound of claim 1, wherein the polyolefin further comprises a diene monomer component.

4. The non-black mineral-filled white sidewall compound of claim 3, wherein the polyolefin comprises EPDM.

5. The EPDM has an ethylene content in the range of about 50-95% by weight, about 100,000 to about 375,000.
A non-black, mineral-filled white sidewall compound as described in 4 above, having a weight average molecular weight of 0 and a crystallinity of about 0.5 to about 13% by weight. 6. The EPDM has an ethylene content in the range of about 71% by weight, a weight average molecular weight of about 332,000, and about 9.3.
A non-black, mineral-filled white sidewall compound as described in 5 above, having a crystallinity of wt%.

7. The non--5 of 5 above, wherein said EPDM has an ethylene content in the range of about 60% by weight, a weight average molecular weight of about 360,000, and a crystallinity of about 1% by weight or less.
White sidewall compound filled with black mineral.

8. The non-black mineral filler is hard clay, soft clay, chemically modified clay, calcined clay, mica, talc, alumina trihydrate, calcium carbonate, titanium dioxide, amorphous precipitated hydrated silica. A non-black mineral-filled white sidewall compound of item 1 above, selected from the group consisting of: silicates, silicon dioxide, and mixtures thereof.

9. 9. The non-black mineral-filled white sidewall compound of claim 8 wherein the processing aid is selected from the group consisting of paraffinic oils, naphthenic oils and waxes, and mixtures thereof.

10. The non-black, mineral-filled white sidewall compound of claim 9, wherein the mineral filler comprises about 20 parts by weight clay and the white sidewall compound comprises about 11 parts by weight processing oil.

11. A tire that is at least partially vulcanized and has sidewalls is provided, and a non-black, mineral-filled thermoplastic white sidewall compound is applied to the tire sidewalls to form white sidewalls, and the white sidewalls are A general vulcanization comprising bonding under sufficient pressure and heat to provide acceptable adhesion to the tire sidewalls without the use of solvent or water based adhesives. A method of applying a thermoplastic non-black mineral-filled white sidewall compound to a tire sidewall.

12. The non-black mineral-filled white sidewall compound comprises (A) 100 parts by weight of (1) at least about 10-95.
About 0.5 to about 13 prepared from parts by weight of monomers having at least 2 carbon atoms and mixtures thereof.
A polymer blend comprising a polyolefin having a crystallinity of wt%, and (2) about 5-90 parts by weight of a thermoplastic crystallinity increasing polymeric additive, (B) 100 parts of About 20-200 per polymer blend
Parts by weight of a filler selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) about 20-150 per 100 parts of the polymer blend.
The method of claim 11 prepared by mixing together parts by weight of processing aids and mixtures thereof.

13. The thermoplastic crystallinity increasing polymeric additives include polyethylene and polypropylene homopolymers, poly (ethylene-co-propylene) disordered copolymers, and poly (ethylene-b-octene) and poly.
13. The method according to 12 above, which is selected from the group consisting of (ethylene-b-butene) copolymers.

14. The method of 13 above, wherein the polyolefin further comprises a diene monomer component.

15. 14. The non-black mineral-filled white sidewall compound of 14 above, wherein the polyolefin comprises EPDM.

16. The non-black mineral filler is hard clay, soft clay, chemically modified clay, calcined clay, mica, talc, alumina trihydrate, calcium carbonate,
12. The above 12 non-black mineral filled white sidewall compound selected from the group consisting of titanium dioxide, amorphous precipitated hydrated silica, silicates, silicon dioxide, and mixtures thereof.

17. 16. The non-black mineral-filled white sidewall compound of claim 16, wherein the processing aid is selected from the group consisting of paraffinic oils, naphthenic oils and waxes, and mixtures thereof.

18. 17. The non-black, mineral-filled white sidewall compound of 17 above, wherein the mineral filler comprises about 20 parts by weight clay and the white sidewall compound comprises about 11 parts by weight processing oil.

19. The method of claim 11 wherein said providing step comprises the step of forming a circumferential groove in said sidewall of said tire for receiving said thermoplastic white sidewall compound and cleaning said sidewall.

20. 20. The method of claim 19 including the additional step of applying a thermoplastic film to the circumferential grooves to improve compatibility prior to the step of applying the thermoplastic white sidewall compound.

21. The method of claim 11 including the additional step of applying a thermoplastic film to the sidewalls to improve compatibility prior to the step of applying the thermoplastic white sidewall compound.

22. The bonding step is about 133 ° -about 160
The method of claim 11 carried out at a temperature of ° C and at a pressure of about 8 to about 200 psi.

23. The sidewall portion and 100 parts by weight of (A) adhered thereto, (1) at least about 10-95.
About 0.5 to about 13 prepared from parts by weight of monomers having at least 2 carbon atoms and mixtures thereof.
A polymer blend comprising a polyolefin having a crystallinity of wt%, and (2) about 5-90 parts by weight of a thermoplastic crystallinity increasing polymeric additive, (B) 100 parts of About 20-200 per polymer blend
Parts by weight of a filler selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) about 20-150 per 100 parts of the polymer blend.
Si prepared from parts by weight of a thermoplastic polymeric composition comprising processing aids and mixtures thereof.
non-black mineral filled white sidewall compound and sidewall attached to d wall area
A tire with l area.

24. The thermoplastic crystallinity increasing polymeric additives include polyethylene and polypropylene homopolymers, poly (ethylene-co-propylene) disordered copolymers, and poly (ethylene-b-octene) and poly.
23. The tire of 23 above, selected from the group consisting of (ethylene-b-butene) copolymers.

25. The tire of claim 23, wherein the polyolefin further comprises a diene monomer component.

26. The tire of claim 23, wherein the polyolefin comprises EPDM.

27. The EPDM has an ethylene content in the range of about 50-95% by weight, about 100,000-about 375.0.
Weight average molecular weight of 00, and about 0.5 to about 13% by weight
26 non-black mineral-filled white sidewall compound having a crystallinity of

28. The tire of claim 27, wherein the EPDM has an ethylene content of about 71 wt%, a weight average molecular weight of about 332,000, and a crystallinity of about 9.3 wt%.

29. The tire of claim 27, wherein the EPDM has an ethylene content of about 60% by weight, a weight average molecular weight of about 360,000, and a crystallinity of less than about 1% by weight.

30. The non-black mineral filler is hard clay, soft clay, chemically modified clay, calcined clay, mica, talc, alumina trihydrate, calcium carbonate,
23. The tire of claim 23 selected from the group consisting of titanium dioxide, amorphous precipitated hydrated silica, silicates, silicon dioxide, and mixtures thereof.

31. The tire of claim 30, wherein the processing aid is selected from the group consisting of paraffinic oils, naphthenic oils and waxes and mixtures thereof.

32. The tire of claim 31, wherein the mineral filler comprises about 20 parts by weight clay and the white sidewall compound comprises about 11 parts by weight processing oil.

[Brief description of drawings]

FIG. 1 is a side elevational view of a tire depicting white sidewalls.

FIG. 2 is a partial enlarged view of a molded tire before forming a circumferential groove therein.

FIG. 3 is a partial close-up view of the tire similar to FIG. 2 but depicted in FIG. 1 depicting the circumferential groove in the sidewall portion.

4 is a partially further enlarged cross-sectional view taken substantially along line 4-4 of FIG.

FIG. 5 is a further enlarged exploded view depicting the white sidewalls of the present invention, layers of thermoplastic film and circumferential grooves in the black sidewall portion of the tire.

FIG. 6 is a schematic flow chart displaying the steps of the method according to the invention.

Claims (3)

[Claims] 1. About 0.5-prepared from 100 parts by weight of (A), (1) at least about 10-95 parts by weight of monomers having at least 2 carbon atoms and mixtures thereof. A polymer blend comprising a polyolefin having a crystallinity of about 13% by weight, and (2) about 5-90 parts by weight of a thermoplastic crystallinity increasing polymeric additive, (B) 100 parts. About 20-200 per polymer blend of
Parts by weight of a filler selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) about 20-150 per 100 parts of the polymer blend.
A conventional vulcanization without the use of solvent or water based adhesives made of parts by weight of the thermoplastic polymeric composition of an object comprising processing aids and mixtures thereof. Non-black mineral-filled white sidewall compound capable of adhering to tire sidewalls. 2. Providing a tire that is at least partially vulcanized and has sidewalls, and applying a non-black mineral-filled thermoplastic white sidewall compound to the tire sidewalls to form white sidewalls, And bonding the white sidewalls to the tire sidewalls under sufficient pressure and heat to provide acceptable adhesion without the use of solvent or water based adhesives. A method of applying a thermoplastic non-black mineral-filled white sidewall compound to a typical vulcanized tire sidewall. 3. The sidewall portion and 100 parts by weight of (A) adhered thereto, (1) at least about 10-95.
About 0.5 to about 13 prepared from parts by weight of monomers having at least 2 carbon atoms and mixtures thereof.
A polymer blend comprising a polyolefin having a crystallinity of wt%, and (2) about 5-90 parts by weight of a thermoplastic crystallinity increasing polymeric additive, (B) 100 parts of About 20-200 per polymer blend
Parts by weight of a filler selected from the group consisting of reinforcing or non-reinforcing fillers and mixtures thereof, and (C) about 20-150 per 100 parts of the polymer blend.
Si prepared from parts by weight of a thermoplastic polymeric composition comprising processing aids and mixtures thereof.
Non-black mineral-filled white sidewall compound and sidewall attached to dew area
A tire with l area.