English:
[0009] In another embodiment, the invention also provides for articles such as inneiiiners for tires produced from the aforementioned elastomeric compositions.
[0010] Various specific embodiments, versions and examples of the invention will now be described, including preferred embodiments and definitions that are adopted herein for purposes of-understanding the claimed invention.
[0016] Elastomeric composition refers to any composition comprising at least one elastomer as defined above.
[0034] In one embodiment, the SBB is typically a composition of the butyl or halogenated butyl rubber as described above and a copolymer of a polydiene and a partially hydrogenated polydiene selected from the group including styrene, polybutadiene, polyisoprene, polypiperylene, natural rubber, styrene-butadiene rubber, ethylene-propylene diene rubber (EPDM), ethylene-propylene rubber (EPR), styrene-butadiene-styrene and styrene-isoprene-styrene block copolymers.
[0035] A commercial embodiment of the SBB of the present invention is SB Butyl 4266 (ExxonMobil Chemical Company, Houston, TX), having a Mooney viscosity (ML 1+8 at 125C, ASTM D 1646) of from 34 to 44. Further, cure characteristics of SB Butyl 4266 are as follows: MH is 69 +- 6 dN-rn, ML is 11.5 +- 4.5 dN-m (ASTM D2084).
[0048] The elastomer(s) such as discussed above may be prepared by a slurry polymerization, typically in a diluent comprising a halogenated hydrocarbon(s) such as a chlorinated hydrocarbon and/or a fluorinated hydrocarbon including mixtures thereof, (see e.g., WO 2004/058828, WO 2004/058827, WO 2004/058835, WO 2004/058836, WO 2004/058825, WO 2004/067577, and WO 2004/058829)
[0055] In another embodiment, the elastomeric composition may also comprise rubbers of ethylene and propylene derived units such as EPM and EPDM as suitable additional rubbers. Examples of suitable comonomers in making EPDM are ethylidene norbornene, 1,4-hexadiene, dicyclopentadiene, as well as others. These rubbers are described in RUBBER TECHNOLOGY, P 260-283 (1995). A suitable ethylene-propylene rubber is commercially available as VISTALON(TM) (ExxonMobil Chemical Company, Houston, TX).
[0063] The ethylene composition of a polymer can be measured as follows. A thin homogeneous film is pressed at a temperature of about 15OC or greater, then mounted on a Perkin Elmer PE 1760 infrared spectrophotometer. A full spectrum of the sample from 600 cm to 4000 cm is recorded and the monomer weight percent of ethylene can be calculated according to the following equation: Ethylene wt% = 82.585 -111.987X + 30.045 X, wherein X is the ratio of the peak height at 1155 cm and peak height at either 722 cm or 732 cm, whichever is higher.
[0068] The crystallinity of the polymer may also be expressed in terms of crystallinity percent. The thermal energy for the highest order of polypropylene is estimated at 189 J/g. That is, 100% crystallinity is equal to 189 J/g. Therefore, according to the aforementioned heats of fusion, the polymer has a polypropylene crystallinity within the range having an upper limit of 65%, 40%, 30%, 25%, or 20%, and a lower limit of 1%, 3%, 5%, 7%, or 8%.
[0082] In another embodiment, the elastomeric compositions may comprise at least one thermoplastic resin. Thermoplastic resins suitable for practice of the present invention may be used singly or in combination and are resins containing nitrogen, oxygen, halogen, sulfur or other groups capable of interacting with an aromatic functional groups such as halogen or acidic groups. The resins are present in the nanocomposite from 30 to 90 wt% of the nanocomposite in one embodiment, and from 40 to 80 wt% in another embodiment, and from 50 to 70 wt% in yet another embodiment.
[0083] Suitable thermoplastic resins include resins selected from the group consisting or polyamides, polyimides, polycarbonates, polyesters, polysulfones, polylactones, polyacetals, acrylonitrile-butadiene-styrene resins (ABS), polyphenyleneoxide (PPO), polyphenylene sulfide (PPS), polystyrene, styrene- acrylonitrile resins (SAN), styrene maleic anhydride resins (SMA), aromatic polyketones (PEEK, PED, and PEKK) and mixtures thereof.
[0086] Poly(phenylene ether) (PPE) thermoplastic resins which may be used in accordance with this invention are well known, commercially available materials produced by the oxidative coupling polymerization of alkyl substituted phenols. They are generally linear, amorphous polymers having a glass transition temperature in the range of 19OC to 235C. These polymers, their method of preparation and compositions with polystyrene are further described in U.S.
[0087] Other thermoplastic resins which may be used include the polycarbonate analogs of the polyesters described above such as segmented poly (ether co-phthalates); polycaprolactone polymers; styrene resins such as copolymers of styrene with less than 50 mol% of acrylonitrile (SAN) and resinous copolymers of styrene, acrylonitrile and butadiene (ABS); sulfone polymers such as polyphenyl sulfone; copolymers and homopolymers of ethylene and C2 to C8 [alpha]- olefins, in one embodiment a homopolymer of propylene derived units, and in another embodiment a random copolymer or block copolymer of ethylene derived units and propylene derived units, and like thermoplastic resins as are known in the art.
[0093] The elastomer may be present in the elastomeric composition in a range from up to 90 phr in one embodiment, from up to 50 phr in another embodiment, from up to 40 phr in another embodiment, and from up to 30 phr in yet another embodiment. In yet another embodiment, the elastomer may be present from at least 2 phr, and from at least 5 phr in another embodiment, and from at least 5 phr in yet another embodiment, and from at least 10 phr in yet another embodiment.
[0094] In other embodiments, the elastomer, either individually or as a blend (i.e., reactor blends, physical blends such as by melt mixing) of elastomers may be present in the composition from 5 to 90 phr in one embodiment, and from 10 to 80 phr in another embodiment, and from 30 to 70 phr in yet another embodiment, and from 40 to 60 phr in yet another embodiment, and from 5 to 50 phr in yet another embodiment, and from 5 to 40 phr in yet another embodiment, and from 20 to 60 phr in yet another embodiment, and from 20 to 50 phr in yet another embodiment, the chosen embodiment depending upon the desired end use application of the composition.
[0095] The elastomeric compositions may also contain at least one other elastomer or two or more elastomers.
[0096] In certain embodiments and where applicable, the elastomers used in the practice of the invention can be linear, substantially linear, blocky or branched.
[0097] The elastomeric compositions may also include a variety of other components as discussed in greater detail below and may be optionally cured to form cured elastomeric compositions that ultimately are fabricated into end use articles.
[00104] In an embodiment, the functionalized polymer comprises C2-C12 [alpha]- olefin derived units.
[00105] In another embodiment, the functionalized polymer comprises C4-C10 isoolefin derived units.
[00108] Exemplary viscosities (ASTM D445) of the processing aid may range from 10 to 6000 cSt (centiStokes) at 100C in one embodiment, and from 35 to 5000 cSt at 100C in another embodiment, and is greater than 35 cSt at 100C in yet another embodiment, and greater than 100 cSt at 100C in yet another embodiment.
[00114] In yet other embodiments, the processing aid or elastomeric composition may include other components such as the following.
[00125] The NFP may be present in the polyolefm compositions of the invention from 0.1 to 60 wt% in one embodiment, and from 0.5 to 40 wt% in another embodiment, and from 1 to 20 wt% in yet another embodiment, and from 2 to 10 wt% in yet another embodiment, wherein a desirable range may comprise any upper wt% limit with any lower wt% limit described herein.
[00128] The NFP has a viscosity (ASTM D445) of from 0.1 to 3000 cSt at 100C, and from 0.5 to 1000 cSt at 100C in another embodiment, and from 1 to 250 cSt at 100C in another embodiment, and from 1 to 200 cSt at 100C in yet another embodiment, and from 10 to 500 cSt at 100C in yet another embodiment, wherein a desirable range may comprise any upper viscosity limit with any lower viscosity limit described herein.
[00137] Other processing aids include esters, polyethers, and polyalkylene glycols.
[00142] Group II - mildly hydrocracked mineral oils with conventional solvent extraction of aromatics, solvent dewaxing, and more severe hydrofining to reduce sulfur levels to less than or equal to 0.03 wt% as well as removing double bonds from some of the olefinic and aromatic compounds, saturate levels are greater than 95-98% and VI is about 80-120; and
[00144] The processing aid is typically present or used in the manufacturing process from 1 to 70 phr in one embodiment, from 3 to 60 phr in another embodiment, and from 5 to 50 phr in yet another embodiment.
[00162] The modifying agent such as described herein is present in the composition in an amount to achieve optimal air retention as measured by the permeability testing described herein. For example, but not limited to, the additive may be employed from 0.1 to 40 phr in one embodiment, and from 0.2 to 20 phr in another embodiment, and from 0.3 to 10 phr in yet another embodiment.
[00168] Peroxide cure systems or resin cure systems may also be used.
[00169] Heat or radiation-induced crosslinking of polymers may be used.
[00177] The compositions produced in accordance with the present invention typically contain other components and additives customarily used in rubber mixes, such as effective amounts of other nondiscolored and nondiscoloring processing aids, pigments, antioxidants, and/or antiozonants.
[00191] In another application, the elastomeric compositions may be employed in air cushions, pneumatic springs, air bellows, hoses, accumulator bags, and belts such as conveyor belts or automotive belts.
[00192] They are useful in molded rubber parts and find wide applications in automobile suspension bumpers, auto exhaust hangers, and body mounts.
[00200] This brominated, neutralized polymer solution mixture was decanted into a 2000 ml separatory funnel, was then washed with 2000 ml of de-ionized water, and the bottom aqueous layer was drained leaving the polymer solution behind. The polymer solution was transferred to a 4000 ml beaker and the polymer was precipitated out of solution by slowly adding 2000 ml of methanol (Fisher certified A.C.S. grade, 99.9%) to the polymer solution while continuously stirring. The precipitated polymer, which was obtained in a 99+% yield, was dried in a vacuum oven at 35C with a nitrogen gas purge for a one week time period.
[00204] Oxygen permeability was measured using a MOCON OxTran Model 2/61 operating under the principle of dynamic measurement of oxygen transport through a thin film as published by Pasternak et al. in 8 JOURNAL OF POLYMER SCIENCE: PART A-2, P 467 (1970). The units of measure are cc-mm/m-day- mmHg. Generally, the method is as follows: flat film or rubber samples are clamped into diffusion cells which are purged of residual oxygen using an oxygen free carrier gas. The carrier gas is routed to a sensor until a stable zero value is established. Pure oxygen or air is then introduced into the outside of the chamber of the diffusion cells.
[00209] Results of cure and cured physical property testing indicate that use of the functionalized polymer BrPIB (Expt 3) maintains the reduced MOCON Air Permeability obtained when using a PIB NFP processing aid (Control 2) in place of the naphthenic processing oil (Control 1) in the tire innerliner formulation. Expt 3 also has higher Mooney scorch and ts2 cure time values compared to that of the naphthenic processing oil (Control 1), which allows for easier processing in downstream tire manufacturing steps.
[00211] Results of cure and cured physical property testing indicate that use of BrPIB (Expt 6) maintains the reduced MOCON Air Permeability obtained when using a PIB NFP processing aid (Control 5) in the tire innerliner formulation compared to the naphthenic processing oil (Control 4). Expt 3 also has lower Shore A hardness and Modulus values that are more similar to that of the naphthenic processing oil (Control 4) compared to the higher values of the PIB NFP (Control 5), see Table 6. Other cure and cured physical properties are also maintained. TABLE 6.
[00212] The functionalized polymer brominated polyisobutylene (BrPIB, Expt 9) was incorporated into a brominated isobutylene-co-p[alpha]r[alpha]-methylstyrene rubber tire innerliner formulation along with other rubber compounding ingredients (see Table 2) by mixing in a Banbury(TM) internal mixer in a two-step process. Compounds with a naphthenic processing oil, Control 7, and the NFP polyisobutylene processing aid, Control 8, were prepared as comparative examples. Formulations are shown in Table 7.
[00213] Results of cure and cured physical property testing indicate that use of BrPIB (Expt 9) maintains the reduced MOCON Air Permeability obtained when using a PIB NFP processing aid (Control 8) in the tire innerliner formulation compared to the naphthenic processing oil (Control 7). Expt 9 has lower Mooney viscosity and Mooney scorch values that are more similar to those of the naphthenic processing oil (Control 7) compared to the higher Mooney viscosity or lower Mooney scorch values of the PIB NFP (Control 8), see Table 8, which allows for easier processing of the uncured mixes in downstream tire manufacturing steps.

中文:
[0009]在另一个实施方案中,本发明还提供由上述弹性体组合物制备的制品例如轮胎的内衬。
[0010]现在描述本发明的各个特定的实施方案、变型和实施例,其中包括为了理解请求保护的本发明而采用的优选实施方案和定义。
[0016]弹性体组合物是指包含至少一种上面所限定的弹性体的任何组合物。
[0034]在一个实施方案中,SBB通常是如上所述的丁基或卤化丁基橡胶和聚二烯的共聚物与部分氢化的聚二烯的组合物,所述聚二烯选自苯乙烯,聚丁二烯,聚异戊二烯,聚间戊二烯,天然橡胶,苯乙烯-丁二烯橡胶,乙烯-丙烯-二烯橡胶(EPDM),乙烯-丙烯橡胶(EPR)、苯乙烯-丁二烯-苯乙烯和苯乙烯-异戊二烯-苯乙烯嵌段共聚物。基于单体wt%,这些聚二烯在一个实施方案中存在量大于0.3wt%,在另一个实施方案中存在量0.3-3wt%,在又一个实施方案中存在量0.4-2.7wt%。
[0035]本发明的SBB的商业实施方案是SB Butyl4266(ExxonMobil Chemical Company,Houston,TX),其具有34-44的门尼粘度(ML 1+8,125°C,ASTM D 1646)。此外,SB Butyl 4266的固化特性如下:MH是69±6dN·m,ML是11.5±4.5dN·m(ASTM D2084)。
[0048]如上面所述的弹性体(一种或多种)可以通过淤浆聚合,通常在包括卤化烃(一种或多种)如氯化烃和/或氟化烃(包括它们的混合物)的稀释剂中制备(例如参见WO 2004/058828、WO 2004/058827、WO2004/058835、WO 2004/058836、WO 2004/058825、WO 2004/067577和WO 2004/058829)。
[0055]在另一个实施方案中,所述弹性体组合物还可以包含乙烯和丙烯衍生的单元的橡胶如EPM和EPDM作为适合的附加橡胶。适合于制备EPDM的共聚单体的实例是乙叉基降冰片烯,1,4-己二烯,双环戊二烯以及其它单体。这些橡胶在RUBBER TECHNOLOGY,P260-283(1995)中进行了描述。适合的乙烯-丙烯橡胶可作为VISTALONTM商购(ExxonMobil Chemical Company,Houston,TX)。
[0063]聚合物的乙烯组成可以如下测量。在大约150°C或更高的温度下压制薄的均匀薄膜,然后装配在Perkin Elmer PE 1760红外分光光度计上。记录样品在600cm-1-4000cm-1中的完整光谱并可以根据以下公式计算乙烯的单体重量百分率:乙烯wt%=82.585-111.987X+30.045X2,其中X是在1155cm-1处的峰高度与在722cm-1处或732cm-1处的峰高度(按两者中较高者计算)的比值。该聚合物中其它单体的浓度也可以使用这一方法测量。
[0068]聚合物的结晶度还可以按结晶度百分率来表示。聚丙烯的最高级别的热能估计为189J/g。也就是说,100%结晶度等于189J/g。因此,根据上述熔化热,聚合物具有在上限为65%、40%、30%、25%或20%,下限为1%、3%、5%、7%或8%的范围内聚丙烯结晶度。
[0082]在另一个实施方案中,弹性体组合物可以包含至少一种热塑性树脂。适合于本发明实践的热塑性树脂可以单独地或结合地使用并且是含氮、氧、卤素、硫或其它能够与芳族官能团相互作用的基团如卤素或酸基的树脂。该树脂在一个实施方案中以纳米复合材料的30-90wt%,在另一个实施方案中以40-80wt%,在又一个实施方案中以50-70wt%的量存在该纳米复合材料中。在又一个实施方案中,该树脂以大于该纳米复合材料的40wt%,在另一个实施方案中大于60wt%的含量存在。
[0083]适合的热塑性树脂包括选自聚酰胺、聚酰亚胺、聚碳酸酯、聚酯、聚砜、聚内酯、聚缩醛、丙烯睛-丁二烯-苯乙烯树脂(ABS)、聚苯醚(PPO)、聚苯硫醚(PPS)、聚苯乙烯、苯乙烯-丙烯腈树脂(SAN)、苯乙烯-马来酸酐树脂(SMA)、芳族聚酮(PEEK、PED和PEKK)和它们的混合物的树脂。
[0086]可以根据本发明使用的聚(亚苯基醚)(PPE)热塑性树脂是为人熟知的,通过烷基取代的酚的氧化偶合聚合制备的可商购材料。它们通常是玻璃化转变温度为190°C-235°C的线性、无定形聚合物。这些聚合物,它们的制备方法和具有聚苯乙烯的组合物在美国专利号3,383,435中进行了进一步描述。
[0087]可以使用的其它热塑性树脂包括上述聚酯的聚碳酸酯类似物,例如多嵌段(segmented)聚(醚-共聚-苯二甲酸酯);聚己内酯聚合物;苯乙烯树脂例如苯乙烯与小于50mol%丙烯腈的共聚物(SAN)和苯乙烯、丙烯腈和丁二烯的树脂共聚物(ABS);砜聚合物例如聚苯砜;乙烯和C2-C8 α-烯烃的共聚物和均聚物,在一个实施方案中,丙烯衍生的单元的均聚物,在另一个实施方案中,乙烯衍生的单元和丙烯衍生的单元的无规共聚物或嵌段共聚物,和本领域中已知的类似热塑性树脂。
[0093]所述弹性体在弹性体组合物中的存在量在一个实施方案中可以为至多90phr,在另一个实施方案中可以为至多50phr,在另一个实施方案中可以为至多40phr,在又一个实施方案中可以为至多30phr。在又一个实施方案中,所述弹性体的存在量可以为至少2phr,在另一个实施方案中可以为至少5phr,在又一个实施方案中可以为至少5phr,在又一个实施方案中可以为至少10phr。一个合乎需要的实施方案可以包括任何phr上限和任何phr下限的任何组合。
[0094]在其它实施方案中,弹性体(单独地或作为弹性体的共混物(即,反应器共混物、物理共混物例如通过熔融混合))在组合物中的存在量在一个实施方案中可以是5phr-90phr,在另一个实施方案中可以是10-80phr,在又一个实施方案中可以是30-70phr,在又一个实施方案中可以是40-60phr,在又一个实施方案中可以是5-50phr,在又一个实施方案中可以是5-40phr,在又一个实施方案中可以是20-60phr,在又一个实施方案中可以是20-50phr,所选定的实施方案取决于所述组合物的所需的最终用途应用。
[0095]所述弹性体组合物还可以包含至少一种其它的弹性体或两种或更多种弹性体。所述弹性体还可以与其它材料或聚合物结合。
[0096]在某些实施方案中和当适用时,本发明实践中使用的弹性体可以是线性、基本上线性、嵌段或支化的。
[0097]所述弹性体组合物还可以包括下面更详细论述的各种其它组分,并且可以任选地经固化而形成最终被制造成最终用途制品的固化弹性体组合物。
[00104]在一个实施方案中,官能化聚合物包含C2-C12 α-烯烃衍生的单元。
[00105]在另一个实施方案中,官能化聚合物包含C4-C10异烯烃衍生的单元。
[00108]加工助剂的示例性粘度(ASTM D445)在一个实施方案中可以为10-6000cSt(厘沲)(100°C),在另一个实施方案中可以为35-5000cSt(100°C),在又一个实施方案中大于35cSt(100°C),在又一个实施方案中大于100cSt(100°C)。
[00114]在还有的其它实施方案中,加工助剂或弹性体组合物可以包括其它组分例如以下组分。
[00125]NFP在一个实施方案中以0.1-60wt%,在另一个实施方案中以0.5-40wt%,在又一个实施方案中以1-20wt%,在又一个实施方案中以2-10wt%的量存在于本发明的聚烯烃组合物中,其中合乎需要的范围可以包括在此描述的任何wt%上限与任何wt%下限。
[00128]NFP具有在一个实施方案中0.1-3000cSt(100°C),在另一个实施方案中0.5-1000cSt(100°C),在又一个实施方案中1-250cSt(100°C),在又一个实施方案中1-200cSt(100°C),在又一个实施方案中10-500cSt(100°C)的粘度(ASTM D445),其中合乎需要的范围包括这里所述的任何粘度上限与任何粘度下限。
[00137]其它加工助剂包括酯、聚醚和聚亚烷基二醇。
[00142]II组-采用芳族化合物的常规溶剂萃取、溶剂脱蜡和更剧烈加氢精制的温和加氢裂化矿物油,将硫含量降低至低于或等于0.03wt%以及从一些烯属和芳族化合物中除去了双键,饱和物水平高于95-98%,VI是大约80-120;和
[00144]所述加工助剂剂通常在一个实施方案中以1-70phr的量,在另一个实施方案中以3-60phr的量,在又一个实施方案以5-50phr的量存在或用于制造方法。
[00162]所述改性剂例如本文描述的以达到最佳气密性(由在此描述的渗透性试验测量)的量存在于组合物中。例如,但不限制,所述添加剂可以在一个实施方案中以0.1-40phr,在另一个实施方案中以0.2-20phr,在又一个实施方案中以0.3-10phr的量使用。
[00168]还可以使用过氧化物固化体系或树脂固化体系。
[00169]可以使用聚合物的热或辐射诱导交联。
[00177]根据本发明制备的组合物通常含有习惯上用于橡胶混合物的其它组分和添加剂,例如有效量的其它非着色和不变色的加工助剂、颜料、抗氧化剂和/或抗臭氧剂。
[00191]在另一个应用中,所述弹性体组合物可以用于气垫、气压弹簧、气袋、胶管、缓冲袋和带子例如输送带或汽车带。
[00192]它们可用于模塑加工的橡胶部件和并在汽车悬挂减震器,汽车排气悬挂器,和车身固定架上有广泛用途。
[00200]将这种溴化、中和的聚合物溶液混合物倾析到2000ml分液漏斗中,然后用2000ml去离子水洗涤,并排出底部含水层,留下聚合物溶液。将该聚合物溶液转移至4000ml烧杯中,并通过慢慢地将2000ml甲醇(Fisher certified A.C.S.等级,99.9%)添加到聚合物溶液中同时连续地搅拌从溶液中沉淀析出聚合物。在真空烘箱中在35°C下用氮气吹扫一个星期将该沉淀的聚合物(其以99+%产率获得)干燥。然后再溶解该聚合物,再一次再沉淀,然后在真空烘箱中干燥。
[00204]氧气渗透率使用在氧气通过薄膜迁移的动态测量原理下工作的MOCON OxTran Model 2/61测量,如由Pasternak等人在8JOURNAL OF POLYMER SCIENCE:PART A-2 P467(1970)中所公开的那样。测量单位是cc-mm/m2-天-mmHg。一般来说,该方法如下:将平坦薄膜或橡胶样品夹入到扩散池内,该扩散池使用无氧载气吹扫掉残留氧气。将载气输送到传感器,直到确立稳定的0值为止。然后将纯氧气或空气引入到扩散池的腔室的外部。通过薄膜扩散到内室的氧气被输送到传感器,该传感器测量该氧气扩散速率。
[00209]固化和固化的物理性能试验的结果表明:使用官能化聚合物BrPIB(Expt 3)保持了当在轮胎内衬配方中使用PIB NFP加工助剂(对照样品2)代替环烷加工油(对照样品1)时所获得的降低的MOCON空气渗透率。Expt 3与环烷加工油(对照样品1)相比还具有更高的门尼焦烧值和ts2固化时间值,这使得在下游轮胎制造步骤中能够更容易的加工。与当使用PIB NFP(对照样品2)时获得的较高值相比,Expt3还具有更低的肖尔A硬度、模量和正切Delta热积聚值,这更与环烷加工油(对照样品1)的相似,参见表4。其它固化和固化的物理性能也得到保持。
[00211]固化和固化的物理性能试验的结果表明:与环烷加工油(对照样品4)相比,使用BrPIB(Expt 6)保持了当在轮胎内衬配方中使用PIB NFP加工助剂(对照样品5)时所获得的降低的MOCON空气渗透率。与PIB NFP(对照样品5)的较高值相比,Expt 3还具有更低的肖尔A硬度和模量值,这与环烷加工油(对照样品4)更加相似,参见表6。其它固化和固化的物理性能也得到保持。
[00212]通过在BanburyTM密炼机中按两步法混合将官能化聚合物溴化聚异丁烯(BrPIB,Expt 9)连同其它橡胶配混成分(参见表2)引入溴化异丁烯-共聚-对甲基苯乙烯橡胶轮胎内衬配方。制备含有环烷加工油(对照样品7)和含有NFP聚异丁烯加工助剂(对照样品8)的配混物作为对比实施例。配方在表7中示出。
[00213]固化和固化的物理性能试验的结果表明:与环烷加工油(对照样品7)相比,使用BrPIB(Expt 9)保持了当在轮胎内衬配方中使用PIB NFP加工助剂(对照样品8)时所获得的降低的MOCON空气渗透率。与PIB NFP(对照样品8)的较高的门尼粘度或较低的门尼焦烧值相比,Expt 9具有更低的门尼粘度和门尼焦烧值,这与环烷加工油(对照样品7)的那些更加相似,参见表8,这使得未固化混合物能够在下游轮胎制造步骤中更容易加工。与PIB NFP(对照样品8)的较高值相比,Expt 9还具有更低的模量和更高的断裂伸长率值,这与环烷加工油(对照样品7)更加相似,参见表8。其它固化和固化的物理性能也得到包持。