EP1297037A1 - Verzweigte copolymere auf basis von ungesättigten nitrilen und konjugierten dienen - Google Patents

Verzweigte copolymere auf basis von ungesättigten nitrilen und konjugierten dienen

Info

Publication number
EP1297037A1
EP1297037A1 EP01938236A EP01938236A EP1297037A1 EP 1297037 A1 EP1297037 A1 EP 1297037A1 EP 01938236 A EP01938236 A EP 01938236A EP 01938236 A EP01938236 A EP 01938236A EP 1297037 A1 EP1297037 A1 EP 1297037A1
Authority
EP
European Patent Office
Prior art keywords
copolymers
conjugated dienes
unsaturated nitriles
branched
branched copolymers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01938236A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hans Magg
Luigi Marinelli
Rolf Josten
Hans-Rafael Winkelbach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lanxess Deutschland GmbH
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP1297037A1 publication Critical patent/EP1297037A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
    • C08C19/00—Chemical modification of rubber
    • C08C19/02—Hydrogenation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
    • C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
    • C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
    • C08F236/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with nitriles

Definitions

  • the present invention relates to branched copolymers based on unsaturated nitriles and conjugated dienes, a process for the preparation thereof and their use for the production of vulcanizates and for improving the flowability in the case of elastomers and mixtures thereof, in which the elastomers are mixed with the copolymers according to the invention.
  • EP 0 779 300 B1 describes an unsaturated nitrile / conjugated diene copolymer which contains at least 0.03 mol, per 100 mol of monomeric units which form the copolymer molecule, of an alkylthio group having 12 to 16 carbon atoms and at least 3 tertiary carbon atoms and further contains a sulfur atom directly attached to at least one of the tertiary carbon atoms.
  • copolymers described in EP 0 779 300 B1 have a high vulcanization rate, which is required in the injection molding process, and give vulcanizates which have good oil and cold resistance combined with a high mechanical
  • copolymers described in the cited European patent already have improved processing properties, in particular in the injection molding process, it is desirable to provide copolymers based on unsaturated nitriles and conjugated dienes which are much easier to process, especially in the injection molding process can, ie have improved flowability, and which also result in vulcanizates which have a level of properties which gives technically usable moldings. It has now been found that copolymers based on unsaturated nitriles and conjugated dienes have a particularly good flow behavior if they have a certain proportion of chain branches in the molecule.
  • the present invention therefore relates to branched copolymers based on unsaturated nitriles and conjugated dienes, which are characterized in that the bound unsaturated nitrile content is 15 to 50% by weight and the Mooney viscosity is in the range from 15 to 150 M.E. [ML 1 + 4/100 ° C], the chain branch is in the range from 0 to 20 ° (determined by the ⁇ B value) and the solubility measured in methyl ethyl ketone at 20 ° C is> 85% by weight.
  • Copolymers which have a bound unsaturated nitrile content of 15 to 45% by weight and whose Mooney viscosity is in the range from 25 to 85 M.E. lies, which have a chain branch in the range of 4 to 16 ° and whose solubility is greater than 95 wt .-%.
  • Examples of the unsaturated nitriles which can be used to construct the branched copolymers according to the invention are: acrylonitrile, methacrylonitrile and ⁇ -chloroacrylonitrile.
  • Acrylonitrile is preferably used.
  • conjugated dienes examples include 1,3-butadiene, 2,3-dimethylbutadiene, isoprene and 1,3-pentadiene, preferably 1,3-butadiene.
  • the structural monomers mentioned still add other copolymerizable monomers.
  • examples include: monomers containing vinyl groups, such as styrene, ⁇ -methylstyrene and vinylpyridine, non-conjugated dienes, such as vinyl norbornene, dicyclopentadiene and 1,4-hexadiene, unsaturated carboxylic acids, such as acrylic and methyl acrylic acid, fumaric acid and maleic acid, unsaturated carboxylic acid esters, such as methacrylates,
  • Ethyl acrylates methyl methacrylates, propyl acrylates, propyl methacrylates or butyl acrylates or 2-ethylhexyl acrylates.
  • copolymerizable monomers are usually added in amounts of up to 50% by weight, based on the total amount of monomers used.
  • the copolymers according to the invention based on unsaturated nitriles and conjugated dienes have an average molecular weight (M ⁇ determined by the thermal field flow fractionation (ThFFF) method in the range from 2,000 to 150,000, preferably 4,000 to 80,000.
  • the average molecular weight ( M w ) is 80,000 to 8,000,000, preferably 150,000 to 5,000,000, determined by the ThFFF method.
  • the ratio of M w / M n is in the range from 3.5 to 250, preferably 5.0 to 150.
  • the branched copolymers according to the invention are prepared by polymerizing the monomers to be used in a customary manner by the emulsion process in the presence of a chain regulator or molecular weight regulator.
  • a chain regulator or molecular weight regulator When adding the molecular weight regulator, it is important that the regulator is not in one batch, i.e. all at once, is added to the polymerization batch, but in several stages.
  • the molecular weight regulator is added in at least two stages, preferably three or more stages. Even a continuous one
  • the molecular weight regulator can be added in an amount of 5 to 65%, preferably 10 to 60%, based on the total amount of regulator, before the start of the polymerization, and the remaining amount of molecular weight regulator in a subsequent metering at a conversion of 5 to 80%, preferably 10 to 55%, based on the total amount used
  • the polymerization is usually carried out in emulsion with the customary emulsifiers (0.05 to 10 parts by weight per 100 parts by weight of monomers, preferably 0.5 to 3 parts by weight per 100 parts by weight of monomers) based on e.g. Fatty acids, fatty acid esters or fatty acid salts in the presence of a free radical generator (initiator), for example organic or inorganic peroxides, at temperatures in the range of about 5 to 100 ° C.
  • a free radical generator for example organic or inorganic peroxides
  • Other emulsifiers to be mentioned are those based on resin acids (disproportionated or hydrogenated) based on
  • Sulfonates aliphatic or aromatic
  • sulfates aliphatic or aromatic
  • non-ionic surfactants aliphatic or aromatic
  • chain regulators can be used to prepare the copolymers according to the invention, as described in EP 0 779 300 B1, page 3, lines 51-58. Further chain regulators or molecular weight regulators are in the same patent mentioned on page 4 in the 3rd paragraph. Particularly noteworthy are alkylthiols, such as 2,4,4, -trimethylpentan-2-thiol, 2,2 ', 4,6,6'-pentamethylheptan-4-thiol, 2,2', 4,6,6 l , 8 , 8'-Heptamethylnonan-4-thiol and mixtures thereof.
  • alkylthiols such as 2,4,4, -trimethylpentan-2-thiol, 2,2 ', 4,6,6'-pentamethylheptan-4-thiol, 2,2', 4,6,6 l , 8 , 8'-Heptamethylnonan-4-thiol and mixtures thereof.
  • the chain regulators mentioned are used in amounts of 0.05 to 3% by weight, preferably 0.2 to 2% by weight, in particular 0.4 to 1.2% by weight, based on 100 parts by weight of monomer, used in the polymerization of the monomers.
  • the emulsion polymerization should be controlled with the aid of the chain regulator so that the copolymers according to the invention are based on unsaturated ones
  • Nitriles and conjugated dienes can be obtained with the corresponding chain branch.
  • the final conversion is at least 80%, preferably at least 85%.
  • the chain branching of the copolymers according to the invention is determined by the ⁇ g value, specifically according to the following procedure:
  • the ⁇ B value is then calculated using the following formula:
  • ⁇ B ⁇ (0.0167 Hz) - ⁇ (15.92 Hz), where ⁇ is the loss angle of the rubber sample.
  • the sample is heated for 5 minutes at 100 ° C in a rheometer and homogenized.
  • the solubility of the copolymers according to the invention is determined by dissolving the copolymers in methyl ethyl ketone at 20 ° C., filtering and completely removing the solvent by distillation. The undissolved fraction is then determined after drying at temperatures of approximately 80 ° C., if appropriate under vacuum, by appropriate weighing. Drying is carried out to constant weight.
  • the Mooney viscosities are determined in accordance with DIN 53 523 and the bound unsaturated nitrile content is determined in accordance with Kjeldahl analogously to EP 0 779 300 B1, p. 8.
  • Copolymers are determined using the thermal field flow fractionation method. The determination was carried out using the ThFFF Channel T-100 from Wyatt. The polymer obtained is separated into fractions according to the molecular weight. The separation and determination of the molecular weights of the fractions took place in that the partition walls of the separation channel were different
  • Another object of the invention is the use of the branched copolymers according to the invention based on unsaturated nitriles and conjugated dienes for the production of corresponding hydrogenated copolymers.
  • the copolymers according to the invention are usually hydrogenated in the presence of a suitable catalyst in the presence of hydrogen, for example in DE-A 253 913, EP-A 213 422 A, EP-A-174 076, EP-A-134 023 and US Pat. A 4 581 417.
  • the hydrogenation is ended when the desired residual double bond content has been reached.
  • the hydrogenated, branched copolymers obtained have a nitrile content, one
  • the hydrogenation is preferably carried out up to a content of residual double bonds in the range from 0 to 30%, preferably 0.1 to 12%, based on the content of polymerized conjugated dienes.
  • the residual double bond content of the hydrogenated copolymers thus obtained is usually determined in accordance with ASTM D 5670-95.
  • Both the non-hydrogenated and the hydrogenated, branched copolymers can be used for the production of moldings of all types, which are produced by injection molding or extrusion.
  • the copolymers can also be used to improve the flowability of elastomers, such as copolymers based on unsaturated nitrile and conjugated diene, and their hydrogenated secondary products (NBR and HNBR) of Ethylene-vinyl acetate copolymers, polyacrylates, ethene-acrylate elastomers, fluoropolymers and polyvinyl chloride.
  • the copolymers according to the invention are preferably used both in hydrogenated and in non-hydrogenated form for blending NBR and HNBR rubbers.
  • a continuously operated reactor cascade (5 reactors) with 166 parts by weight of water per 100 parts by weight of monomer, 2 parts by weight of potassium fatty acid salt (emulsifier), 34.5 parts by weight of acrylonitrile, 65.5 parts by weight Butadiene, 0.0071 parts by weight of iron (II) sulfate and a portion of the molecular weight regulator 2.2 l , 4,6,6'-pentamethylheptan-4-thiol of 0.15 parts by weight.
  • the reaction is started by adding 0.322 parts by weight of p-menthane hydroperoxide in the form of an emulsion polymerization at 13 ° C.
  • the remaining amount of the molecular weight regulator of 0.74 parts by weight is added and polymerized until the desired final conversion of 87%.
  • the ratio of the amount of molecular weight regulator initially added and the last amount of molecular weight regulator added is 1: 4.9.
  • the polymerization is terminated by adding 0.15 part by weight of diethylhydroxylamine.
  • the reaction solution is then freed of unreacted monomers by heating to 50 ° C. and applying a vacuum of 600 mbar. 0.3% by weight of an alkylated bisphenol is added to the polymer contained as an anti-aging agent.
  • the polymer is precipitated by adding sulfuric acid, separated off and washed thoroughly with water and alkali, and then dried at 130 ° C.
  • the polymerization is carried out with the molecular weight regulator mentioned, but in contrast to the example according to the invention, 0.39 part by weight of the molecular weight regulator is initially metered in and, after a conversion of 45%, 0.17 part by weight of the molecular weight regulator is added become.
  • the polymerization is carried out up to a conversion of 75%, based on the monomers used.
  • the polymer is isolated in the manner described above.
  • the ratio of the initial amount of molecular weight regulator to the amount of molecular weight regulator added later is 2.3: 1.
  • this copolymer was blended with the blend components shown in Table 4 below.
  • a linear NBR Comparative Example 2 was mixed with the same mixture components.
  • the mixture components listed in Table 4 were mixed in an internal mixer under the same mixing conditions.
  • the copolymers were mixed in an internal mixer from Werner & Pfleiderer of the GK 90 type at an initial temperature of the internal mixer of 50 ° C.
  • the polymer was first plasticized for about 30 seconds and then the mixture constituents given in Table 4 were added little by little. Mixing took a total of 3.5 minutes. After the mixture had cooled, the mixture viscosity was determined in accordance with DIN 53 523 in the customary manner.
  • the mixture viscosity of the NBR according to the invention is substantially lower than the mixture viscosity of the linear NBR not according to the invention. This is surprising since, according to Table 2, the Mooney viscosities of the NBR according to the invention and of the NBR according to the invention are practically comparable.
  • the mixture described above was examined in a so-called rheovulometer test.
  • the Rheovulkameter test was carried out with a Rheovulkameter from the company Göttfert, Germany, at a punch / nozzle temperature of 100 ° C, a mold / mold temperature of 180 ° C, at a Injection time of 20 seconds, a pressure of 70 bar and a preheating time of 100 seconds.
  • the mixture is passed through a capillary under the specified pressure and injected into a vulcanization mold.
  • the vulcanization mold is tempered so that the injected mass vulcanizes in the mold during the filling process, but remains in the capillary in the uncured state.
  • the amount of the injected mass in the mold is determined (mold filling), larger quantities (higher degrees of filling) reflecting better processability of the mixture.
  • the vulcanizates are based on the copolymers according to the invention and were produced by heating the above-mentioned rubber mixture in a heating press at 160 ° C. for 10 minutes. After this time, the mixture was cooled and the physical properties of the vulcanizate obtained were determined.
  • the strength, elongation at break and the tension value were determined in accordance with DIN 53 430, the hardness in accordance with DIN 53 53 519 and the compression set in accordance with DIN 53 517. The values determined are shown in Table 7 below. Table 7
  • the branched copolymers according to the invention can be used to produce vulcanizates which are comparable in their essential physical properties to the conventional linear copolymers.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Polymerisation Methods In General (AREA)
EP01938236A 2000-06-07 2001-05-25 Verzweigte copolymere auf basis von ungesättigten nitrilen und konjugierten dienen Withdrawn EP1297037A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10027768A DE10027768A1 (de) 2000-06-07 2000-06-07 Verzweigte Copolymere auf Basis von ungesättigten Nitrilen und konjugierten Dienen
DE10027768 2000-06-07
PCT/EP2001/005970 WO2001094432A1 (de) 2000-06-07 2001-05-25 Verzweigte copolymere auf basis von ungesättigten nitrilen und konjugierten dienen

Publications (1)

Publication Number Publication Date
EP1297037A1 true EP1297037A1 (de) 2003-04-02

Family

ID=7644732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01938236A Withdrawn EP1297037A1 (de) 2000-06-07 2001-05-25 Verzweigte copolymere auf basis von ungesättigten nitrilen und konjugierten dienen

Country Status (13)

Country Link
US (1) US20030171518A1 (enExample)
EP (1) EP1297037A1 (enExample)
JP (1) JP4903973B2 (enExample)
KR (1) KR20030010669A (enExample)
AU (1) AU2001263939A1 (enExample)
BR (1) BR0111517A (enExample)
CA (1) CA2411680C (enExample)
DE (1) DE10027768A1 (enExample)
MX (1) MXPA02012109A (enExample)
PL (1) PL199382B1 (enExample)
RU (1) RU2003100394A (enExample)
TW (1) TWI307347B (enExample)
WO (1) WO2001094432A1 (enExample)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6899500B2 (en) * 2001-06-19 2005-05-31 Illinois Tool Works Inc. Fastner having multiple-bossed lead
CA2409429A1 (en) * 2002-10-17 2004-04-17 Bayer Inc. Hydrogenated nitrile rubber composites with improved proccesability
CA2409436A1 (en) 2002-10-17 2004-04-17 Bayer Inc. Polymer composites comprising low molecular weight nitrile rubber
CA2409434A1 (en) * 2002-10-17 2004-04-17 Bayer Inc. Polymer blends comprising low molecular weight nitrile rubber
CA2535796A1 (en) * 2003-08-22 2005-03-03 Pharmacia & Upjohn Company Llc N-aryl-2-cyanooxazolidinones and their derivatives
DE102007024008A1 (de) * 2007-05-22 2008-11-27 Lanxess Deutschland Gmbh Nitrilkautschuke
EP2423234A1 (de) * 2010-08-31 2012-02-29 LANXESS Deutschland GmbH Kautschukblends aus verschiedenen Nitrilkautschuken
WO2015046559A1 (ja) * 2013-09-30 2015-04-02 日本ゼオン株式会社 ニトリル共重合体ゴムおよびその製造方法
EP2860196A1 (de) 2013-10-14 2015-04-15 LANXESS Deutschland GmbH Nitrilkautschuke mit niedrigen Emissionswerten
JP6864471B2 (ja) * 2016-12-26 2021-04-28 マクセルホールディングス株式会社 熱接着テープおよび熱接着テープの製造方法

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DD154702A1 (de) * 1980-11-25 1982-04-14 Joerg Stricker Verfahren zur herstellung von butadien-acrylnitril-copolymerisaten
DE3329974A1 (de) * 1983-08-19 1985-02-28 Bayer Ag, 5090 Leverkusen Herstellung von hydrierten nitrilkautschuken
DE3529252A1 (de) * 1985-08-16 1987-02-19 Bayer Ag Verfahren zur selektiven hydrierung ungesaettigter verbindungen
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WO1996006868A1 (en) * 1994-08-29 1996-03-07 Nippon Zeon Co., Ltd. Unsaturated nitrile-conjugated diene copolymer, process for producing the same, and vulcanizable rubber composition
JP3603344B2 (ja) * 1994-09-07 2004-12-22 日本ゼオン株式会社 不飽和ニトリル−共役ジエン共重合体、その製造方法および加硫性ゴム組成物
JP3579929B2 (ja) * 1994-08-29 2004-10-20 日本ゼオン株式会社 不飽和ニトリル−共役ジエン共重合体、その製造方法および加硫性ゴム組成物
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Also Published As

Publication number Publication date
PL358983A1 (en) 2004-08-23
JP2003535931A (ja) 2003-12-02
KR20030010669A (ko) 2003-02-05
CA2411680A1 (en) 2002-12-04
CA2411680C (en) 2011-07-26
US20030171518A1 (en) 2003-09-11
TWI307347B (en) 2009-03-11
MXPA02012109A (es) 2003-06-06
JP4903973B2 (ja) 2012-03-28
PL199382B1 (pl) 2008-09-30
WO2001094432A1 (de) 2001-12-13
RU2003100394A (ru) 2004-07-10
AU2001263939A1 (en) 2001-12-17
BR0111517A (pt) 2003-05-06
DE10027768A1 (de) 2001-12-13

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