US20060241244A1 - Oriented thermoplastic elastomer film and process for producing the same - Google Patents

Oriented thermoplastic elastomer film and process for producing the same Download PDF

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Publication number
US20060241244A1
US20060241244A1 US10/548,064 US54806403A US2006241244A1 US 20060241244 A1 US20060241244 A1 US 20060241244A1 US 54806403 A US54806403 A US 54806403A US 2006241244 A1 US2006241244 A1 US 2006241244A1
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Prior art keywords
nylon
film
thermoplastic elastomer
oriented thermoplastic
elastomer
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Abandoned
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US10/548,064
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English (en)
Inventor
Yoshihiro Soeda
Haishung Tsou
Foshee Caraway
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Yokohama Rubber Co Ltd
ExxonMobil Chemical Patents Inc
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Individual
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Publication of US20060241244A1 publication Critical patent/US20060241244A1/en
Assigned to EXXONMOBIL CHEMICALS PATENTS, INC., THE YOKOHAMA RUBBER CO., LTD. reassignment EXXONMOBIL CHEMICALS PATENTS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SOEDA, YOSHIHIRO, TSOU, HAISHUNG ANDY, CARAWAY, FOSHEE JOYCE
Priority to US12/648,057 priority Critical patent/US7879272B2/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • C08L23/283—Halogenated homo- or copolymers of iso-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/254—Polymeric or resinous material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/268—Monolayer with structurally defined element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/269—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component

Definitions

  • the present invention relates to an oriented thermoplastic elastomer film having reduced permeability and improved fatigue resistance and also to a method of preparing the same. More particularly, the present invention relates to a process for producing a thermoplastic elastomer film composition with enhanced planar orientation for reduction in gas permeability and a process for producing a pneumatic tire using the same.
  • EP722850B1 disclosed a low-permeability thermoplastic elastomer composition that is superior as a gas-barrier layer in pneumatic tires.
  • This thermoplastic composition comprises a low-permeability thermoplastic matrix such as polyamides or blends of polyamides, in which a low-permeability rubber such as brominated poly(isobutylene-co-p-methylstyrene) (i.e., or BIMS) is dispersed.
  • BIMS brominated poly(isobutylene-co-p-methylstyrene)
  • Viscosity ratio between the thermoplastic matrix and the rubber dispersion was specified in order to achieve phase continuity in thermoplastic and fine rubber dispersions. Criticality of smaller rubber dispersions was recognized in EP969039A1 in these thermoplastic elastomers for delivering acceptable durability especially for their usage as innerliners in pneumatic tires.
  • thermoplastic elastomer film for property enhancement and for permeability reduction was disclosed conceptually. No experimental data were provided in this patent application. Further, the process specified in this application involves bi-axial orientation of cast film through drafting, tentering, and heatsetting by assuming the film in discussion has the strain hardening characteristics and suitable stretching dynamics. In the present invention, the planar orientation in a thermoplastic elastomer cast film is imposed simply by the film casting and/or film blowing process and film blowning for the improvement in film properties. This thermoplastic elastomer film does not have the suitable stretching dynamics for it to be oriented by a sequential bi-axial orientation process.
  • the objects of the present invention are to provide an oriented thermoplastic elastomer film having a reduced gas permeability and improved fatigue resistance and also to provide a method of preparing the same.
  • an oriented thermoplastic elastomer film having reduced permeability and improved fatigue resistance comprising a dynamically vulcanized polymer blend of (A) a halogenated isobutylene elastomer and (B) polyamide, the film is produced by casting or blowing the above polymer blend under the condition such that a shear rate at a die lip for casting or blowing is regulated to control the molecular arrangement in the film, whereby the planar birefringence (PBR) of the resultant film becomes greater or equal to 0.002, preferably the PBR is 0.004 or more.
  • PBR planar birefringence
  • the present invention relates to an oriented thermoplastic elastomer film having reduced permeability and improved fatigue resistance and to a method of preparing the same.
  • the present invention relates to film casting and blowing processes for producing a thermoplastic elastomer film with enhanced planar orientation and a process for producing a pneumatic tire using the same.
  • the preferred planar birefringence of the oriented thermoplastic elastomer film is greater or equal to 0.002.
  • the orientation could be imposed by either increasing wind-up speed during casting and blowing or increasing the blow-up ratio during film blowing.
  • FIG. 1 shows the correlation between the planar orientation of the film and the permeability thereof.
  • thermoplastic elastomer composition is a blend of a halogenated isobutylene elastomer and a polyamide, which is subjected to dynamic vulcanization.
  • dynamic vulcanization is used herein to connote a vulcanization process in which the engineering resin and a vulcanizable elastomer are vulcanized under conditions of high shear. As a result, the vulcanizable elastomer is simultaneously crosslinked and dispersed as fine particles of a “micro gel” within the engineering resin matrix.
  • Dynamic vulcanization is effected by mixing the ingredients at a temperature which is at or above the curing temperature of the elastomer in equipment such as roll mills, Banbury® mixers, continuous mixers, kneaders or mixing extruders, e.g., twin screw extruders.
  • the unique characteristic of the dynamically cured compositions is that, notwithstanding the fact that the elastomer component may be fully cured, the compositions can be processed and reprocessed by conventional rubber processing techniques such as extrusion, injection molding, compression molding, etc. Scrap or flashing can be salvaged and reprocessed.
  • the halogenated isobutylene elastomer component include copolymers of isobutylene and para-alkylstyrene, such as described in European Patent Application 0 344 021.
  • the copolymers preferably have a substantially homogeneous compositional distribution.
  • Preferred alkyl groups for the para-alkyl styrene moiety include alkyl groups having from 1 to 5 carbon atoms, primary haloalkyl, secondary haloalkyl having from 1 to 5 carbon atoms and mixtures thereof.
  • a preferred copolymer comprises isobutylene and para-methylstyrene.
  • Suitable halogenated isobutylene elastomer components include copolymers (such as brominated isobutylene-paramethylstyrene copolymers) having a number average molecular weight Mn of at least about 25,000, preferably at least about 50,000, preferably at least about 75,000, preferably at least about 100,000, preferably at least about 150,000.
  • the copolymers may also have a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn), i.e., Mw/Mn of less than about 6, preferably less than about 4, more preferably less than about 2.5, most preferably less than about 2.0.
  • suitable halogenated isobutylene elastomer components include copolymers (such as brominated isobutylene-paramethylstyrene copolymers) having a Mooney viscosity (1+4) at 125° C. (as measured by ASTM D 1646-99) of 25 or more, preferably 30 or more, more preferably 40 or more.
  • Preferred brominated copolymers of isobutylene and para-methylstyrene include those having 5 to 12 weight % para-methylstyrene, 0.3 to 1.8 mol % brominated para-methylstyrene, and a Mooney viscosity of 30 to 65(1+4) at 125° C. (as measured by ASTM D 1646-99).
  • the halogenated isobutylene elastomer component (A) can be prepared from isobutylene and about 0.5 to 25% by weight, preferably about 2 to 20% by weight, based upon the total amount of the comonomers, of p-alkylstyrene, preferably p-methylstyrene, followed by the halogenation.
  • the content of the halogen e.g., Br and/or Cl, preferably Br
  • copolymerization can be carried out in a known manner as described in, for example, European Patent Publication No. EP-34402/A published Nov. 29, 1989 and the halogenation can be carried out in a known method as described in, for example, U.S. Pat. No. 4548995.
  • the halogenated isobutylene elastomer preferably has the number-average molecular weight (Mn) of at least about 25,000, more preferably at least about 100,000 and a ratio of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn), i.e., Mw/Mn of preferably less than about 10, more preferably less than about 8.
  • the polyamides usable in the present invention are thermoplastic polyamides (nylons) comprise crystalline or resinous, high molecular weight solid polymers including copolymers and terpolymers having recurring amide units within the polymer chain.
  • Polyamides may be prepared by polymerization of one or more epsilon lactams such as caprolactam, pyrrolidione, lauryllactam and aminoundecanoic lactam, or amino acid, or by condensation of dibasic acids and diamines. Both fiber-forming and molding grade nylons are suitable.
  • polyamides examples include polycaprolactam (Nylon 6), polylauryllactam (Nylon 12), polyhexamethyleneadipamide (Nylon 66), polyhexamethyleneazelamide (Nylon 69), polyhexamethylenesebacamide (Nylon 610), polyhexamethyleneisophthalamide (Nylon 6 IP), Nylon 612, Nylon 46, Nylon MXD 6, Nylon 6/66 and the condensation product of 11-amino-undecanoic acid (Nylon 11). Additional examples of satisfactory polyamides (especially those having a softening point below 275° C.) are described in Kirk-Othmer, Encyclopedia of Chemical Technology, v. 10, page 919, and Encyclopedia of Polymer Science and Technology, Vol. 10, pages 392-414. Commercially available thermoplastic polyamides may be advantageously used in the practice of this invention, with linear crystalline polyamides having a softening point or melting point between 160° C.-230° C. being preferred.
  • the amounts of the elastomer (A) and the polyamide (B) usable in the present invention is preferably 95 to 25 parts by weight and 5 to 75 parts by weight, more preferably 90 to 25 parts by weight and 10 to 75 parts by weight, respectively, provided that the total amount of the components (A) and (B) is 100 parts by weight.
  • the elastomer composition according to the present invention may contain, in addition to the above-mentioned essential ingredients, a vulcanization or cross-linking agent, a vulcanization or cross-linking accelerator, various types of oils, an antiaging agent, reinforcing agent, plasticizer, softening agent, or other various additives generally mixed into general rubbers.
  • the compounds are mixed and vulcanized by general methods to make the composition which may then be used for vulcanization or cross-linking.
  • the amounts of these additives added may be made the amounts generally added in the past so long as they do not run counter to the object of the present invention.
  • Nylon 1 A blend of N11 (Rilsan BESN O TL) and N6/66 (Ube 5033B)
  • Nylon 2 N6/66 (CM6001FS)
  • Additive 1 Plasticizer: N- butylbenzenesulfonamide, Compatibilizer: AR-201
  • Additive 2 Stabilizer: Irganox 1098, Tinuvin 622LD, and CuI
  • BIMS Brominated copolymer of isobutylene and para-methylstyrene sold under the tradename EXXPRO 89-4 by ExxonMobil Chemical Company having a mooney viscosity of about 45, approximately 5 weight % para-methylstyrene and about 0.75 mol % bromine
  • D 1 is the equivalent diameter of individual dispersion and n 1 is the number of the dispersion with an equivalent diameter of D 1 .
  • the oxygen permeation measurements were done using a Mocon OX-TRAN 2/61 permeability tester at 60° C.
  • n1, n2, and n3 are refractive indices along the machine direction, the transverse direction, and the film normal direction, respectively.
  • BIMS was pre-compounded with curatives in a Banbury internal mixer and pelletized with the anti-block agent prior to its mixing with Nylon.
  • Mixing and dynamic vulcanization of Nylon and BIMS were done in a twin-screw extruder at about 230° C. These mixes were then cast or blown into films. 2′′ diameter disks were punched out from these films and conditioned in a vacuum oven at 60° C. overnight prior to the permeability measurements. Oxygen permeation values of these films at 60° C. were measured using a Mocon OX-TRAN 2/61 permeability tester. Principal refractive indices along the three principal directions of these films were determined using a Metricon prism-coupling device.
  • the operation wavelength was 632.8 nm generated by a low-power He-Ne laser.
  • 1, 2, and 3 refer to machine, transverse, and normal (normal to the film plane) directions, respectively.
  • Nylon 1 matrix with the addition of plasticizer and compatibilzer was used as shown in Table 1.
  • Nylon 1 matrix with plasticizer has its viscosity closely match with that of BIMS.
  • MBTS is a cure retarder and DM16D is a viscosity enhancer. Both can react with benzylic bromine of BIMS and affect its reactive compatibilization with Nylon. Because of the this interfacial bonding modification between BIMS and Nylon with MBTS and DM16D, Nylon orientation during film casting or blowing could be affected. As shown in Table 1, reduction in cast film thickness through the increase in wind-up speed with the same cast die results in an increase in planar orientation and a corresponding reduction in permeability.
  • Nylon 1 matrix was used but without the plasticizer and compatibilizer.
  • 6PPD could be a curative at the mixing temperature of 230° C. by crosslinking BIMS through benzylic bromines and, hence, removing them from reactive compatibilization.
  • DM16D is a viscosity enhancer for BIMS that also react with benzylic bromine of BIMS. This modification of the interfacial bonding with the usage of DM16D and 6PPD could significantly lower the planar orientation and raise the film permeability as shown in Table 2. The results are shown in FIG. 1 . Regardless, a good correlation could be found between PBR and permeability.
  • Nylon 2 matrix without N11 and without plasticizer, was used.
  • viscosity modifier such as DM16D and 6PPD
  • concentration used for the anti-blocking agents listed in Table 3 is 0.5 to 1 phr.
  • using ZnO as the anti-blocking agent could significantly affect the orientation.
  • This anti-blocking agent may act as curative and, hence, remove benzylic bromines from BIMS for its reactive compatibilization with Nylon.

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US10/548,064 2003-03-06 2003-03-06 Oriented thermoplastic elastomer film and process for producing the same Abandoned US20060241244A1 (en)

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PCT/US2003/006560 WO2004081116A1 (fr) 2003-03-06 2003-03-06 Film elastomere thermoplastique oriente et son procede de production

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EP (1) EP1599542B1 (fr)
JP (1) JP2006514138A (fr)
CN (1) CN100473692C (fr)
AU (1) AU2003216509A1 (fr)
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US11676079B2 (en) 2009-05-08 2023-06-13 Causam Enterprises, Inc. System and method for generating and providing dispatchable operating reserve energy capacity through use of active load management
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JP2006315339A (ja) * 2005-05-13 2006-11-24 Yokohama Rubber Co Ltd:The 熱可塑性エラストマーフィルム
CA2627299C (fr) 2005-10-27 2011-12-20 Exxonmobil Chemical Patents Inc. Construction comprenant une couche de liaison
EP2502742B1 (fr) 2005-10-27 2017-06-21 ExxonMobil Chemical Patents Inc. Construction comprenant une couche de liaison pour bandage pneumatique
RU2406609C2 (ru) 2005-10-27 2010-12-20 Эксонмобил Кемикал Пэйтентс Инк. Конструкция, содержащая соединительный слой
JP5328358B2 (ja) 2005-10-27 2013-10-30 エクソンモービル ケミカル パテンツ，インコーポレイティド 低透過性熱可塑性エラストマー組成物
CN101356065B (zh) 2006-01-10 2011-12-14 横滨橡胶株式会社 具有低空气渗透性的热塑性聚合物组合物的层压材料及使用该层压材料作为内衬的充气轮胎
WO2007111584A1 (fr) * 2006-03-24 2007-10-04 The Yokohama Rubber Co., Ltd. Composition d'elastomere thermoplastique presentant d'excellentes proprietes a basse temperature
US8846792B2 (en) 2006-10-26 2014-09-30 The Yokohama Rubber Co., Ltd. Construction comprising tie layer
CN101541530B (zh) 2006-10-26 2015-09-09 埃克森美孚化学专利公司 低湿气渗透性层压结构
JP4821868B2 (ja) * 2009-03-13 2011-11-24 横浜ゴム株式会社 熱可塑性エラストマー組成物
US8809455B2 (en) * 2009-08-27 2014-08-19 Exxonmobil Chemical Patents Inc. Elastomeric compositions and their use in articles
JP5736677B2 (ja) * 2010-06-25 2015-06-17 横浜ゴム株式会社 熱可塑性エラストマー組成物およびその製造方法
EP2861662B1 (fr) * 2012-06-19 2019-09-25 The Yokohama Rubber Co., Ltd. Composition d'élastomère thermoplastique et procédé de production de celle-ci
JP6238990B2 (ja) 2012-09-06 2017-11-29 エクソンモービル ケミカル パテンツ，インコーポレイティド タイ層を含む構造体
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EP1599542B1 (fr) 2014-06-25
US7879272B2 (en) 2011-02-01
CN100473692C (zh) 2009-04-01
WO2004081116A1 (fr) 2004-09-23
US20100113701A1 (en) 2010-05-06
CN1751098A (zh) 2006-03-22
CA2516066A1 (fr) 2004-09-23
CA2516066C (fr) 2010-06-08
JP2006514138A (ja) 2006-04-27
AU2003216509A1 (en) 2004-09-30
EP1599542A1 (fr) 2005-11-30
AU2003216509A8 (en) 2004-09-30

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