Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/14—Peroxides
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
  • C08K5/098—Metal salts of carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/04—Carbon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/02—Elements
  • C08K3/06—Sulfur
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/10—Esters; Ether-esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/20—Carboxylic acid amides
• • 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
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/04—Homopolymers or copolymers of ethene
  • C08L23/08—Copolymers of ethene
  • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
  • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
• • 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
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• • 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
  • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L7/00—Compositions of natural rubber
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2310/00—Masterbatches
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2312/00—Crosslinking
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/04—Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof

Definitions

• the present invention relates to curing systems for compositions containing halogenated isomonoolefin/para-alkylstyrene copolymer elastomers and blends thereof with other polymers.
• U.S. Patent 4,713,409 discloses vulcanizable polymer compositions comprising a rubbery polymer such as natural rubber, ethylene/propylene rubber, ethylene/propylene/diene rubber, GR-S, nitrile rubber, neopyryene rubber and blends thereof, cured using a combination of at least 25 parts by weight per hundred parts rubber (phr) of a zinc dimethacrylate and a cure effective amount of a peroxide curing agent.
• a rubbery polymer such as natural rubber, ethylene/propylene rubber, ethylene/propylene/diene rubber, GR-S, nitrile rubber, neopyryene rubber and blends thereof.
• Patent 4,857,571 discloses a free radical curing system for saturated and unsaturated elastomer compositions which is based on a combination of a free radical generating agent such as an organic peroxide and a polyfunctional monomer co-agent which is capable of reacting with the free radical generator to crosslink the elastomer composition. Similar compositions are also disclosed in U.S. Patent 5,288,446.
• U.S. Patent 4,987,192 discloses colored tire stocks which are preferably based on a blend of chlorobutyl rubber, natural rubber and EPDM rubbers which are both covalently and ionically crosslinked using a curing system containing conventional sulfur-containing curatives in combination with a zinc dimethacrylate and an organic peroxide.
• Crosslinking in these and similar systems generally relies on the creation of free radical sites along the polymer chain and the addition of the difunctional acrylate or methacrylate monomer at these sites to effect crosslinking.
• U.S. Patent 5,162,445 discloses halogenated elastomeric random copolymers of an isomonoolefin such as polyisobutylene and a para-alkylstyrene such as para- methylstyrene, referred to herein as BIMS rubber. These copolymers are devoid of ethylenic unsaturation thereby enhancing their resistance to heat, solvents and ozone and may be readily crosslinked by nucleophilic or ionic reactions involving the benzylic halide group present along the polymer chain.
• Suitable crosslinking agents include a combination of zinc oxide and stearic acid, or zinc stearate alone used at level above about 3.0 parts by weight per hundred parts rubber (phr).
• Zinc diethyldithiocarbamate is also an effective curative for BIMS rubber.
• Zinc stearate is also known as an effective curative for elastomer compositions based on a blend of the BIMS rubber and unsaturated diolefin rubbers such as polyisoprene, natural rubber or polybutadiene, as disclosed in copending U.S. application SN 08/433,773, filed May 3, 1995.
• the cure level of zinc stearate used in such curable blends ranges from about 0.05 to less than 3 parts by weight phr.
• One of the major goals in exploring curing systems for BIMS elastomers is to uncover curatives which will not only effectively cure the BIMS elastomer by itself, but will also cure blends of BIMS elastomers with other chemically diverse polymers such as saturated or olefinically unsaturated elastomers or plastomers such that a relatively balanced cure for each individual elastomeric component of such blends is achieved.
• the invention provides a curable polymeric composition
• a curable polymeric composition comprising a mixture of a chlorinated or brominated elastomeric, random interpolymer of a C to C isomonoolefin and a para-alkylstyrene comonomer, and a cure effecting amount of curative mixture comprising an organic peroxide and an elastomer-soluble polyvalent metal salt of an unsaturated carboxylic acid containing 3-300 carbon atoms, more preferably an alpha or beta unsaturated monocarboxylic acid containing 3 to 6 carbon atoms.
• the invention also provides for curable polymer blend compositions containing the components listed above and additionally containing at least one other co-curable polymer component which may be a saturated or olefinically unsaturated polymer.
• the polyvalent metal salt curing agents of the present invention provide for fast cure and low reversion cures in halogenated C 4 -C isomonoolefin/para-alkylstyrene elastomer systems when combined with an organic peroxide, and also effectively cure compositions based on a blend of the halogenated copolymers and a second saturated or unsaturated polymer component.
• the halogenated C 4 - C 7 isomonoolefin/para-alkylstyrene elastomers (BIMS) used in the present invention are the halogenation product of random copolymers of a C - C isomonoolefin, such as isobutylene, and a para-alkylstyrene comonomer, preferably para-methylstyrene containing at least about 80%, more preferably at least about 90% by weight of the para isomer, and wherein at least some of the alkyl substituent groups present in the styrene monomer units contain halogen.
• Preferred materials may be characterized as isobutylene interpolymers containing the following monomer units randomly spaced along the polymer chain: l ' and 2 .
• R and R 1 are independently hydrogen, lower alkyl, preferably Ci to C 4 alkyl, and X is bromine or chlorine, and wherein the inte ⁇ olymer is otherwise substantially free of ring halogen or halogen in the polymer backbone chain.
• R and R' are each hydrogen.
• Up to about 65 mole % of the para-alkylstyrene present in the inte ⁇ olymer structure may be the halogenated structure (2) above, more preferably from about 5 to 60 mole %.
• elastomeric random copolymers of isobutylene and para-methylstyrene containing from about 0.5 to about 20 wt% para- methylstyrene wherein up to about 60 mole % of the methyl substkuent groups present on the benzyl ring contain a bromine or chlorine atom, preferably a bromine atom.
• These copolymers have a substantially homogeneous compositional distribution such that at least 95% by weight of the polymer has a para-alkylstyrene content within 10% of the average para-alkystyrene content of the polymer.
• Mw/Mn molecular weight distribution
• the copolymers may be prepared by slurry polymerization of the monomer mixture using a Lewis Acid catalyst, followed by halogenation, preferably bromination, in solution in the presence of halogen and a radical initiator such as heat and/or light and/or a chemical initiator.
• a Lewis Acid catalyst followed by halogenation, preferably bromination, in solution in the presence of halogen and a radical initiator such as heat and/or light and/or a chemical initiator.
• Preferred brominated copolymers generally contain from about 0.01 to about 10 mole % of bromomethyl groups, most of which is monobromomethyl, with less than 0.05 mole % dibromomethyl substituents present in the copolymer.
• These copolymers, their method of preparation, their method of cure and graft or fijnctionalized polymers derived therefrom are more particularly disclosed in U.S. Patent No. 5,162,445, the complete disclosure of which is inco ⁇ orated herein by reference
• Suitable metal salts of unsaturated carboxylic acids useful as a curative component for the BIMS elastomer compositions in the present invention are soluble in organic solvent and in the rubber medium and are derived from unsaturated acids containing 3 to 300 carbon atoms, more preferably 3 to 20 carbon atoms.
• the acids are alpha or beta unsaturated monocarboxylic acids containing from 3 to 6 carbon atoms, including carboxylic carbon.
• Suitable acids include acrylic, methacrylic, oleic, linoleic and crotonic acids, with acrylic and methacrylic acids most preferred.
• the metal cation may be selected from poly - (di or tri) valent metals such as zinc, iron, cadmium, bismuth, aluminum, magnesium and calcium, with zinc being most preferred.
• the level of metal salt curing agent inco ⁇ orated into the composition is an amount effective to cure or co-cure the polymer composition. This level may generally range from about 0.5 to about 10 wt%, based on the polymer content of the composition, more preferably from about 1 to 7.5 wt%, and most preferably from about 2 to 6 wt%.
• Peroxide crosslinking co-curatives which may be employed include organic peroxides such as dicumyl peroxide, benzoyl peroxide, bis - (t-butyl peroxy) diisopropyl benzene, t-butyl peroxide, t-butyl perbenzoate, 2, 5 - dimethyl-2, 5-di-t-butyl peroxy hexane and like materials.
• organic peroxides such as dicumyl peroxide, benzoyl peroxide, bis - (t-butyl peroxy) diisopropyl benzene, t-butyl peroxide, t-butyl perbenzoate, 2, 5 - dimethyl-2, 5-di-t-butyl peroxy hexane and like materials.
• organic peroxides such as dicumyl peroxide, benzoyl peroxide, bis - (t-butyl peroxy) diisopropyl benzen
• the peroxide co-curative is also employed in an amount sufficient to co-cure the polymer composition. Generally, such amounts may range from about 0.2 to about 6 wt%, based on the elastomer content of the composition, more preferably from about 1 to 5 wt%.
• the unsaturated acid metal salts function as a co-curative when combined with an organic peroxide also for the co-curing of blend systems containing the BLMS elastomer and one or more saturated or olefincially unsaturated polymers.
• Suitable blend polymers include one or a mixture of saturated polymers.
• saturated polymer it is meant to include those polymers which have saturated backbone but may have pendant unsaturation.
• Illustrative of such polymers are low, medium or high density polyethylene or copolymers of ethylene with up to about 50 wt% of a C 3 to Cg monoolefin such as propylene, butene-1, hexene-1 and the like.
• Preferred ethylene polymers are polyethylene and elastomeric copolymers of ethylene containing up to about 35 wt% of polymerized propylene, and EPDM, such as elastomeric copolymers of ethylene, propylene and a non-conjugated diene such as ethylidene- norbornene.
• Particularly preferred ethylene copolymers are plastomers polymerized using metallocene polymerization catalyst, such as copolymers of ethylene with from about 5 to 30 wt% of hexene-1 or butene-1, such as available under the EXACTTM tradename from Exxon Chemical Co.
• Suitable ethylene polymers useful as blend components generally exhibit a Melt
• the second polymer component or mixture of polymer components may be present in the composition at a level of from about 1 to 99 parts by weight per 99 to 1 parts by weight of the BIMS elastomer. Most preferred blends are those containing about 20 to 80% by weight of the BIMS elastomer based on the polymer content of the blend.
• Compositions of the invention which also contain an olefincially unsaturated polymer component may also optionally contain auxiliary curatives such as accelerated sulfur vulcanization systems to modify the cure properties. These include sulfur or mixtures of sulfur and sulfur-containing accelerators and/or phenol-formaldehyde resins.
• Suitable accelerators include benzothiazyl disulfide, N-oxydiethylene benzothiazole-1-sulfenamide, 2-mercaptoben-zothiazole, alkyl phenol disulfides, alkyl- thiuram sulfides, m-phenylenebismaleimide, N, N'-diarylguanidines, dialkyl and diaryl- dithiocarbamates, N-cyclohexyl-2-benzothiazole sulfenamide and like materials.
• Suitable dialkyldithiocarbamates include the dialkyldithiocarbamates of zinc, bismuth, cadmium, copper, lead, selenium, and tellurium wherein the alkyl group contains from 1 to 5 carbon atoms, piperidinium pentamethylenedithiocarbamate and mixtures thereof
• Suitable diarylthiocarbamates include the diaryldithiocarbamar.es of zinc, bismuth, cadmium, copper, lead, selenium, tellurium, and mixtures thereof
• Suitable alkyl thiuram sulfides include dipentamethylene thiuram tetrasulfide, tetrabutylthiuram disulfide, tetraethylthiuram disulfide, tetramethylthiuram monosulfide, tetrabenzyl thiuram disulfide, and mixtures thereof.
• Sulfur and vulcanization accelerators are normally added to the composition at levels in the range of from about 0.5 to about 8% by weight, based on the weight of elastomer present in the composition.
• the accelerated sulfur curing system may also be used as a cocurative in curing systems also containing zinc oxide or an equivalent thereof, as an auxiliary curative agent.
• Zinc oxide is normally used in such systems at a level of from about 0.2 to about
• the present invention provides for particularly good low cure reversion where zinc oxide is present at levels in the range of from about 0.5 to about 5.0 parts by weight per 100 parts by weight of elastomer.
• the elastomer polymer composition may also contain other additives such as lubricants, fillers, plasticizers, tackifiers, coloring agents, blowing agents, and antioxidants.
• fillers examples include inorganic filers such as reinforcing grade carbon black, silica, calcium carbonate, talc and clay, and organic fillers such as high-styrene resin, coumarone-indene resin, phenolic resin, lignin, modified melamine resins and petroleum resins.
• lubricants include petroleum-type lubricants such as oils, paraffins, and liquid paraffins, coal tar-type lubricants such as castor oil, linseed oil, rapeseed oil and coconut oil; tall oil; waxes such as beeswax, carnauba wax and lanolin; fatty acids and fatty acid salts such as linoleic acid, palmitic acid, barium stearate, calcium stearate and zinc laurate; and synthetic polymeric substances such as petroleum resins.
• plasticizers include hydrocarbon oils, e.g., paraffin, aromatic and napththenic oils, phthalic acid esters, adipic acid esters, sebacic acid esters and phosphoric acid-type plasticizers.
• tackifiers are petroleum resins, coumarone-indene resins, te ⁇ ene- phenol resins, and xylene/formaldehyde resins.
• coloring agents are inorganic and organic pigments.
• blowing agent examples include sodium bicarbonate, ammonium carbonate, N.N 1 -dinitrosopenta-methylenetetramine, azocarbonamide, azobisisobutyronitrile, benzenesulfonyl hydrazide, toluenesulfonyl hydrazide, calcium amide, p-toluenesulfonyl azide, salicylic acid, phthalic acid and urea.
• the vulcanizable composition may be prepared and blended using any suitable mixing device such as an internal mixer (Brabender Plasticorder), a Banbury Mixer, a mill mixer, a kneader or a similar mixing device.
• Blending temperatures and times may range from about 35°C to 180°C and 4 to 10 minutes respectively.
• the mixture is then vulcanized by the further mixing-in of the crosslinking agents at a relatively low temperature, followed by heating the resulting blend to a temperature of from about 100° to 200°C, more preferably from about 110° to 180°C for a period of time ranging from about 1 to 60 minutes.
• Molded articles such as belts, tire components and hoses are prepared by shaping the prevulcanized formulation using an extruder or a mold, and subjecting the composition to temperatures and curing times as set forth above.
• EXACTTM 5008 a copolymer of ethylene and butene having a melt index of 10 and a density of 0.865
• EXACTTM 3028 a copolymer of ethylene and butene having a melt index of 1.0 and a density of 0.900
• SLP-9053 a copolymer of ethylene and butene having a melt index of 4 and a density of 0.865 VTSTALONTM 2504 - an elastomeric te ⁇ olymer of ethylene (57.5 wt%) propylene and ethylidene-norbornene (4.7 wt%) having a Mooney Viscosity (1+4) 125°C of 25.
• FLEXONTM 815 paraffinic processing oil SARETTM 634 — zinc dimethacrylate available from
• Rubber masterbatches as disclosed in Table 1 were prepared by blending the
• Examples E-J as shown in Table 2 were formulated with both the zinc dimethacrylate and peroxide curing agents and evaluated for curing and physical properties as described in Example 1, except that Sample G was mixed in the two roll mill at 140°C instead of 60°C.
• Table II demonstrates that blends of BIMS and the identified polymers give good initial cure and physical properties and good retention of physical properties after heat aging.
• Example K BIMS (Sample K) and a series of six blends thereof with olefinically unsaturated polymers (Samples L-Q) as shown in Table HI were formulated and evaluated for curing and physical properties as described in Example 1.
• N and P contain the curatives of the present invention whereas Samples M, O and Q contain a conventional sulfur accelerated zinc oxide curing system.
• the data in Table m shows that blends of BIMS and the identified olefinically unsaturated polymers obtain poor heat aging properties.
• the crosslinked vulcanized compositions of this invention have an unusual balance of physical properties and are useful as coatings, adhesives and in molded and extruded mechanical, automotive and industrial goods such as tires, hosing, belting and like applications.

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  • 1997-09-19 AT AT0911597A patent/AT410094B/de not_active IP Right Cessation
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