US20150099826A1 - Treated Fillers, Compositions Containing Same, and Articles Prepared Therefrom - Google Patents

Treated Fillers, Compositions Containing Same, and Articles Prepared Therefrom Download PDF

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Publication number
US20150099826A1
US20150099826A1 US14/508,623 US201414508623A US2015099826A1 US 20150099826 A1 US20150099826 A1 US 20150099826A1 US 201414508623 A US201414508623 A US 201414508623A US 2015099826 A1 US2015099826 A1 US 2015099826A1
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United States
Prior art keywords
treated
filler
slurry
treating
silica
Prior art date
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Abandoned
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US14/508,623
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English (en)
Inventor
Justin Jonathan Martin
Peter Lawrence Votruba-Drzal
Timothy Allen Okel
Raphael O. Kollah
Truman Wilt
Clint Steven Edelman
Brittany Smith
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PPG Industries Ohio Inc
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PPG Industries Ohio Inc
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Application filed by PPG Industries Ohio Inc filed Critical PPG Industries Ohio Inc
Priority to US14/508,623 priority Critical patent/US20150099826A1/en
Publication of US20150099826A1 publication Critical patent/US20150099826A1/en
Assigned to PPG INDUSTRIES OHIO, INC. reassignment PPG INDUSTRIES OHIO, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WILT, TRUMAN, EDELMEN, CLINT STEVEN, KOLLAH, RAPHAEL O., MARTIN, JUSTIN J., OKEL, TIMOTHY A., SMITH, Brittany, VOTRUBA-DRZAL, PETER L.
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
    • 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
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3063—Treatment with low-molecular organic compounds
    • 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
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/42—Introducing metal atoms or metal-containing groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • 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
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • 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
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • 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
    • C08K5/54—Silicon-containing compounds
    • 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
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
    • C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/08—Ingredients agglomerated by treatment with a binding agent
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; 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
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
    • 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
    • C08L7/00—Compositions of natural rubber
    • C08L7/02—Latex
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C08L9/08—Latex
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3072—Treatment with macro-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/3081—Treatment with organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/28—Compounds of silicon
    • C09C1/30—Silicic acid
    • C09C1/309—Combinations of treatments provided for in groups C09C1/3009 - C09C1/3081
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/10—Treatment with macromolecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
    • C09C3/12—Treatment with organosilicon compounds
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • C04B14/066—Precipitated or pyrogenic silica
    • 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
    • C08K9/00—Use of pretreated ingredients
    • 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
    • C08L2666/54—Inorganic substances
    • C08L2666/58—SiO2 or silicates

Definitions

  • the present invention is related to a process for the preparation of treated filler, treated filler produced by the process, and compositions and articles containing such treated filler.
  • silica/silane filler systems to reduce the rolling resistance and improve the wet traction of passenger car and truck tires is known in the art.
  • a reduction of rolling resistance results in less fuel consumption.
  • silica has played a major role in the emergence of the green tire, which boasts a large improvement in rolling resistance compared to past technologies.
  • the direct cross-linking of silica (via coupling) into a highly cross-linked polymer matrix, while minimizing interactions between silica particles, is believed to be of vital importance to desirable dynamic mechanical properties of rubber used in the production of passenger car and truck tires. It has been noted that in natural rubber (typically used in the production of truck tires), the proteins present from natural rubber biosynthesis can adsorb preferentially to the silica surface, interfering with the in-situ coupling reaction. Increased dump temperatures, which might improve the coupling efficiency, have also been shown to degrade natural rubber. Thus, there continues to be a need in the rubber industry for improved silica-rubber coupling materials.
  • high surface area filler materials can cause an undesirable increase in viscosity thereby limiting the amount of high surface area material that can be included in the rubber composition due to process problems.
  • high surface materials e.g., precipitated silica
  • materials which can serve as to render the high surface materials more compatible with the polymeric matrix into which they are being incorporated improve processing viscosity and prevent phase separation of the high surface materials from the polymeric matrix.
  • a process for producing treated filler that includes: (a) treating a slurry that includes untreated filler where the untreated filler has not been previously dried, with a treating composition that includes a treating agent, thereby forming a treated filler slurry; and (b) drying the treated filler slurry to produce treated filler.
  • the treating agent can include at least one of an amino acid and/or a polypeptide.
  • a process for producing treated precipitated silica that includes: (a) combining an alkali metal silicate and an acid to form a slurry that includes untreated silica, where the untreated silica has not been previously dried; (b) treating said slurry with a treating composition that includes a treating agent, thereby forming a treated slurry; and (c) drying said treated slurry to produce treated precipitated silica.
  • the treating agent can include at least one of an amino acid and/or a polypeptide.
  • a process for producing a treated precipitated silica that includes: (a) combining an alkali metal silicate and an acid to form an untreated slurry that includes untreated silica, where the untreated silica has not been previously dried; (b) drying the untreated slurry to produce dried precipitated silica; (c) forming an aqueous slurry of the dried precipitated silica with a treating composition that includes a treating agent, and, optionally, a coupling agent and/or, optionally, a non-coupling agent to form a treated precipitated silica slurry; and (d) drying the treated precipitated silica slurry to produce a dried treated precipitated silica.
  • the treating agent can include at least one of an amino acid and/or a polypeptide.
  • treated filler prepared by the processes described herein, as well as rubber compositions such as rubber compounding compositions including the treated filler, and rubber articles that include the treated filler of the present invention.
  • the present invention provides a process for producing treated filler.
  • the process can include: (a) treating a slurry that can include untreated filler where the untreated filler has not been previously dried, with a treating composition comprising a treating agent, thereby forming a treated filler slurry; and (b) drying the treated filler slurry to produce treated filler.
  • filler such as, treated and/or untreated filler
  • the term “not been previously dried” means filler that, prior to the treatment process, has not been dried to a moisture content of less than 20 percent by weight.
  • untreated filler does not include filler that has been previously dried to a moisture content of less than 20 percent by weight and then rehydrated.
  • filler means an inorganic material such as an inorganic oxide that can be used in a polymer composition to improve at least one property of the polymer.
  • slurry means a mixture including at least filler and water.
  • molecular weight values of polymers such as weight average molecular weights (Mw) and number average molecular weights (Mn) are determined by gel permeation chromatography using appropriate standards, such as polystyrene standards.
  • polydispersity index (PDI) values represent a ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the polymer (i.e., Mw/Mn).
  • polymer means homopolymers (e.g., prepared from a single monomer species), copolymers (e.g., prepared from at least two monomer species), and graft polymers.
  • (meth)acrylate and similar terms, such as “(meth)acrylic acid ester” means methacrylates and/or acrylates.
  • (meth)acrylic acid means methacrylic acid and/or acrylic acid.
  • linear or branched groups such as linear or branched alkyl
  • linear or branched alkyl are herein understood to include: a methylene group or a methyl group; groups that are linear, such as linear C 2 -C 36 alkyl groups; and groups that are appropriately branched, such as branched C 3 -C 36 alkyl groups.
  • “optionally substituted” group means a group, including but not limited to, alkyl group, cycloalkyl group, heterocycloalkyl group, aryl group, and/or heteroaryl group, in which at least one hydrogen thereof has been optionally replaced or substituted with a group that is other than hydrogen, such as, but not limited to, halo groups (e.g., F, Cl, I, and Br), hydroxyl groups, ether groups, thiol groups, thio ether groups, carboxylic acid groups, carboxylic acid ester groups, phosphoric acid groups, phosphoric acid ester groups, sulfonic acid groups, sulfonic acid ester groups, nitro groups, cyano groups, hydrocarbyl groups (including, but not limited to: alkyl; alkenyl; alkynyl; cycloalkyl, including poly-fused-ring cycloalkyl and polycycloalkyl; heterocycloalkyl;
  • halo groups e.g
  • hydrocarbyl and similar terms, such as “hydrocarbyl substituent,” means: linear or branched C 1 -C 36 alkyl (e.g., linear or branched C 1 -C 10 alkyl); linear or branched C 2 -C 36 alkenyl (e.g., linear or branched C 2 -C 10 alkenyl); linear or branched C 2 -C 36 alkynyl (e.g., linear or branched C 2 -C 10 alkynyl); C 3 -C 12 cycloalkyl (e.g., C 3 -C 10 cycloalkyl); C 5 -C 18 aryl (including
  • Representative alkyl groups include but are not limited to methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, neopentyl, hexyl, heptyl, octyl, nonyl and decyl.
  • Representative alkenyl groups include but are not limited to vinyl, allyl and propenyl.
  • Representative alkynyl groups include but are not limited to ethynyl, 1 propynyl, 2-propynyl, 1-butynyl, and 2-butynyl.
  • Representative cycloalkyl groups include but are not limited to cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cyclooctyl substituents.
  • Representative aralkyl groups include but are not limited to benzyl, and phenethyl.
  • substituted hydrocarbyl and similar terms, such as “functional hydrocarbyl” (or hydrocarbyl having at least one functional group) as used herein means a hydrocarbyl group in which at least one hydrogen thereof has been substituted with a group that is other than hydrogen, such as, but not limited to, halo groups, hydroxyl groups, ether groups, thiol groups, thio ether groups, carboxylic acid groups, carboxylic acid ester groups, phosphoric acid groups, phosphoric acid ester groups, sulfonic acid groups, sulfonic acid ester groups, nitro groups, cyano groups, hydrocarbyl groups (e.g., alkyl, alkenyl, alkynyl, cycloalkyl, aryl, and aralkyl groups), heterocycloalkyl groups, heteroaryl groups, and amine groups, such as —N(R 11 ′)(R 12 ′) where R 11 ′ and R 12 ′ are each independently
  • alkyl as used herein, in accordance with some embodiments, means linear or branched alkyl, such as but not limited to, linear or branched C 1 -C 25 alkyl, or linear or branched C 1 -C 10 alkyl, or linear or branched C 2 -C 10 alkyl.
  • alkyl groups from which the various alkyl groups of the present invention can be selected from include, but are not limited to, those recited previously herein.
  • Alkyl groups of the various compounds of the present invention can, with some embodiments, include one or more unsaturated linkages selected from —CH ⁇ CH— groups and/or one or more —C ⁇ C— groups, provided the alkyl group is free of two or more conjugated unsaturated linkages. With some embodiments, the alkyl groups are free of unsaturated linkages, such as CH ⁇ CH groups and —C ⁇ C— groups.
  • cycloalkyl as used herein, in accordance with some embodiments, means groups that are appropriately cyclic, such as but not limited to, C 3 -C 12 cycloalkyl (including, but not limited to, cyclic C 5 -C 7 alkyl) groups. Examples of cycloalkyl groups include, but are not limited to, those recited previously herein.
  • cycloalkyl as used herein in accordance with some embodiments also includes: bridged ring polycycloalkyl groups (or bridged ring polycyclic alkyl groups), such as but not limited to, bicyclo[2.2.1]heptyl (or norbornyl) and bicyclo[2.2.2]octyl; and fused ring polycycloalkyl groups (or fused ring polycyclic alkyl groups), such as, but not limited to, octahydro-1H-indenyl, and decahydronaphthalenyl.
  • bridged ring polycycloalkyl groups or bridged ring polycyclic alkyl groups
  • fused ring polycycloalkyl groups or fused ring polycyclic alkyl groups
  • heterocycloalkyl as used herein, in accordance with some embodiments, means groups that are appropriately cyclic (having at least one heteroatom in the cyclic ring), such as but not limited to, C 3 -C 12 heterocycloalkyl groups or C 5 -C 7 heterocycloalkyl groups, and which have at least one hetero atom in the cyclic ring, such as, but not limited to, O, S, N, P, and combinations thereof.
  • heterocycloalkyl groups include, but are not limited to, imidazolyl, tetrahydrofuranyl, tetrahydropyranyl, and piperidinyl.
  • heterocycloalkyl as used herein, in accordance with some embodiments, also includes: bridged ring polycyclic heterocycloalkyl groups, such as but not limited to, 7-oxabicyclo[2.2.1]heptanyl; and fused ring polycyclic heterocycloalkyl groups, such as but not limited to, octahydrocyclopenta[b]pyranyl, and octahydro 1H isochromenyl.
  • aryl includes C 5 -C 18 aryl, such as C 5 -C 10 aryl (and includes polycyclic aryl groups, including polycyclic fused ring aryl groups).
  • Representative aryl groups include but are not limited to phenyl, naphthyl, anthracynyl and triptycenyl.
  • heteroaryl means aryl groups having at least one heteroatom in the ring, and includes but is not limited to C 5 -C 18 heteroaryl, such as but not limited to C 5 -C 10 heteroaryl (including fused ring polycyclic heteroaryl groups) and means an aryl group having at least one hetero atom in the aromatic ring, or in at least one aromatic ring in the case of a fused ring polycyclic heteroaryl group.
  • heteroaryl groups include, but are not limited to, furanyl, pyranyl, pyridinyl, isoquinoline, and pyrimidinyl.
  • fused ring polycyclic-aryl-alkyl group and similar terms such as, fused ring polycyclic-alkyl-aryl group, fused ring polycyclo-aryl-alkyl group, and fused ring polycyclo-alkyl-aryl group means a fused ring polycyclic group that includes at least one aryl ring and at least one cycloalkyl ring that are fused together to form a fused ring structure.
  • fused ring polycyclic-aryl-alkyl groups include, but are not limited to indenyl, 9H-flourenyl, cyclopentanaphthenyl, and indacenyl.
  • aralkyl as used herein, and in accordance with some embodiments, includes but is not limited to C 6 -C 24 aralkyl, such as but not limited to C 6 -C 10 aralkyl, and means an aryl group substituted with an alkyl group. Examples of aralkyl groups include, but are not limited to, those recited previously herein.
  • Suitable untreated fillers for use in process of the present invention can include a wide variety of materials known to one having ordinary skill in the art.
  • Non-limiting examples can include inorganic oxides such as inorganic particulate and amorphous solid materials which possess either oxygen (chemisorbed or covalently bonded) or hydroxyl (bound or free) at an exposed surface, such as but not limited to oxides of the metals in Periods 2, 3, 4, 5 and 6 of Groups Ib, IIb, IIIa, IIIb, IVa, IVb (except carbon), Va, VIIa, VIIa and VIII of the Periodic Table of the Elements in Advanced Inorganic Chemistry: A Comprehensive Text by F. Albert Cotton et al, Fourth Edition, John Wiley and Sons, 1980.
  • suitable inorganic oxides can include but are not limited to aluminum silicates, silica such as silica gel, colloidal silica, precipitated silica, and mixtures thereof.
  • the inorganic oxide can be silica with some embodiments.
  • the inorganic oxide can include precipitated silica, colloidal silica, and mixtures thereof.
  • the silica can have an average ultimate particle size of less than 0.1 micron, or greater than 0.001 micron, or from 0.01 to 0.05 micron, or from 0.015 to 0.02 micron, as measured by electron microscope.
  • the silica can have a surface area of from 25 to 1000 square meters per gram, such as from 75 to 250 square meters per gram, or from 100 to 200 square meters per gram, as determined by the Brunauer, Emmett, and Teller (BET) method in accordance with ASTM D1993-91.
  • BET Brunauer, Emmett, and Teller
  • the filler is precipitated silica.
  • the untreated filler slurry is treated with a treating composition that can include a treating agent.
  • the treating agent can act as a coupling agent.
  • the term “coupling agent” as used herein means a material that binds (ionically or covalently) to (i) groups present on the surface of the filler particle (such as on the silica surface), as well as to (ii) functional groups present on the component(s) of the polymeric matrix into which the filler is incorporated.
  • the filler particles can be “coupled” to the components in the polymeric matrix.
  • the treating agent can act as a non-coupling agent.
  • non-coupling agent as used herein means a material that serves to compatibilize the treated filler with the polymeric composition in which the treated filler ultimately is used. That is, the non-coupling agent can affect the free surface energy of the treated filler particles to make the treated filler particles have a surface energy similar to that of the polymeric composition. This facilitates incorporation of the treated filler into the polymeric composition, and can serve to improve (such as, decrease) mix viscosity of the composition. It should be noted that non-coupling agents are not expected to couple with the rubber matrix beyond Van der Waal interactions. As used herein, the term “non-coupling agent” can be used interchangeably with “compatibilizer”.
  • treatment agents may simultaneously function as both a coupling agent and a non-coupling agent/compatibilizer.
  • the treating agents utilized in the methods of the present invention include at least one of (i) an amino acid and (ii) a polypeptide, and derivatives thereof.
  • amino acid as used herein means an organic compound having both primary amine (—NH 2 ) and carboxylic acid (—COOH) groups.
  • the amino acid of the treating agent can be represented by the following Formula (A):
  • R is selected from substituted and unsubstituted hydrocarbyl groups.
  • the substituents of the substituted hydrocarbyl groups from which R of Formula (A) can be selected include, but are not limited to, those substituents described herein.
  • the amino acids used with several embodiments of the present invention can be selected from chiral molecules, in which at least one carbon thereof is an asymmetric carbon, and/or achiral molecules.
  • a non-limiting example of an achiral amino acid is glycine. While the majority of amino acids are 1-amino acids (including the proteinogenic amino acids), the term amino acid as utilized herein includes 1- and d-enantiomers of amino acids.
  • Amino acids useful with various embodiments of the present invention include proteinogenic and/or non-proteinogenic amino acids.
  • a proteinogenic amino acid is one that is incorporated into a protein during translation.
  • Proteinogenic amino acids include the twenty classic amino acids (alanine, arginine, asparagine, aspartic acid, cysteine (and the oxidation products thereof, including, for example and without limitation, cystine), glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine) as well as formylmethionine, selenocysteine, and pyrrolysine.
  • Non-proteinogenic amino acid is not incorporated into a protein during translation, though it can be incorporated post-translationally.
  • Non-proteinogenic amino acids include natural amino acids (i.e. those made by a living organism) and non-natural amino acids (i.e. synthetic amino acids).
  • synthetic amino acid means those amino acids that are engineered or produced as a result of human intervention, and which are not naturally produced by a living organism in the absence of human intervention.
  • Non-proteinogenic amino acids include, but are not limited to, ⁇ -amino acids (such as, for example and without limitation, ⁇ -alanine), d-amino acids, homo-amino acids, pyruvic acid derivatives, 3-substituted alanine derivatives, glycine derivatives, ring-substituted phenylalanine and tyrosine derivatives, diamino acids, and N-methyl amino acids. Both proteinogenic and non-proteinogenic amino acids are useful with various embodiments of the present invention.
  • the treating agent(s) useful in the present methods can include a polypeptide in addition to or as an alternative to an amino acid.
  • polypeptide means a chain of two or more amino acid residues in which each pair of amino acid residues is joined by a divalent peptide (—C( ⁇ O)NH—) group.
  • amino acid residue means an amino acid monomer, or single amino acid, that is part of a polypeptide.
  • divalent peptide group includes both cis and trans isomers.
  • the amino acid whether proteinogenic or non-proteinogenic, includes a side chain that optionally includes one or more substitutents (or functional groups), such as R of Formula (A) above.
  • a non-exclusive list of substituents that can be included on the amino acid side chain includes the general categories of alkyls, alkenyls, alkynyls, phenyls, benzyls, halos (including fluoro, chloro, bromo, and iodo groups), hydroxyls, carbonyls, aldehydes, haloformyls, carbonate esters, carboxylates, carboxyls, esters, methoxys, hydroperoxys, peroxys, ethers, hemiacetals, hemiketals, acetals, ketals, orthoesters, methylenedioxys, orthocarbonate esters, carboxamides, primary amines, secondary amines, tertiary amines, quarternary ammonium
  • derivatives means salts, ring opened products, and substituted products.
  • amino acids by definition, include at least two functional groups, the primary amine and primary carboxyl groups, and thus the side chain need not include a functional group.
  • the treating agent includes an amino acid having a polar side chain.
  • polar groups that can be on or define the polar side chain of the amino acid include, but are not limited to, hydroxyl, thiol, carboxyl, phenol, amine, carboxamide, imidazole, and indole groups.
  • amino acids having a polar side chain include, but are not limited to, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, histidine, lysine, serine, threonine, tryptophan, and tyrosine.
  • the side chain need not be charged in order for it to be polar, and that is sufficient that the side chain be attracted to/attractive to water.
  • the polar side chain of the amino acids useful in the present invention are ionizable, or ionized, side chains having, for example and without limitation, hydroxyl, phenol, thiol, imidazole, guanidinium, amine, and ammonium groups.
  • amino acids having an ionizable or ionized side chain include, but are not limited to, cysteine, tyrosine, aspartic acid, glutamic acid, lysine, arginine, and histidine.
  • amino acids, proteinogenic or non-proteinogenic, that have functional sidechains for example, and without limitation, polar and/or ionizable/ionized side chains
  • sidechains for example, and without limitation, polar and/or ionizable/ionized side chains
  • Amino acids useful in the present invention can be synthesized as is known in the art (e.g. Organic Chemistry by John McMurry (4 th Ed), Brooks/Cole Publishing Co. (1996), Chapter 27), or can be obtained from any suitable commercial source, for example from Sigma-Aldrich Corp. (St. Louis, Mo., USA) and Thermo Fisher Scientific, Inc. (Waltham, Mass., USA).
  • the amino acids of the treating agent(s) of the present invention are at least one of free cysteine, cystine, arginine, histidine, tyrosine, methionine, and proline
  • the polypeptide includes residues of cysteine, cystine, arginine, histidine, tyrosine, methionine, and proline.
  • the amino acid is a free amino acid and is at least one of cysteine and/or 1-arginine
  • the polypeptide includes residues of cysteine and/or 1-arginine.
  • the treating composition can further include a first or additional coupling agent that is different than the treating agent.
  • the coupling agent can include any of a variety of organosilanes. Examples of suitable organosilanes that can be used with some embodiments of the present invention include those represented by Formula (I):
  • R 1 is independently for each “a”, a hydrocarbyl group having 1 to 36 carbon atoms and a functional group.
  • the functional group of the hydrocarbyl group is vinyl, allyl, hexenyl, epoxy (oxirane), glycidoxy, (meth)acryloxy, sulfide, isocyanato (—NCO), polysulfide, mercapto, or halogen.
  • R 2 is independently for each “b” a hydrocarbyl group having from 1 to 36 carbon atoms or hydrogen.
  • X of Formula (I) is independently halogen or alkoxy having 1 to 36 carbon atoms; subscript “a” is 0, 1, 2, or 3; subscript “b” is 0, 1, or 2; (a+b) is 1, 2, or 3. With some embodiments, there is the proviso that when b is 1, (a+b) is 2 or 3. With some further embodiments of the present invention, the treating composition further a coupling agent represented by Formula (I), in which X is alkoxy; a is 1; b is 0; and the functional group of the hydrocarbyl of R 1 , is halogen.
  • halo-functional organosilanes such as those represented by Formula (I), include, but are not limited to, (4-chloromethyl-phenyl)trimethoxysilane, (4-chloromethyl-phenyl)triethoxysilane, [2-(4-chloromethyl-phenyl)-ethyl]trimethoxysilane, [2-(4-chloromethyl-phenyl)-ethyl]triethoxysilane, (3-chloro-propenyl)-trimethoxysilane, (3-chloro-propenyl)-triethoxysilane, (3-chloro-propyl)-triethoxysilane, (3-chloro-propyl)-trimethoxysilane, trimethoxy-(2-p-tolyl-ethyl)silane and/or triethoxy-(2-p-tolyl-ethyl)silane.
  • the additional coupling agent can be present in the slurry in an amount ranging from 0.25 to 30.0 weight percent, such as 1 to 15 weight percent, or 5 to 10 weight percent based on the total mass of SiO 2 which has been precipitated.
  • the treating composition useful in the process of the present invention also can further include a sulfur-containing organosilane that is different from the aforementioned optional organosilane coupling agents, such as represented by Formula (I).
  • a sulfur-containing organosilane that is different from the aforementioned optional organosilane coupling agents, such as represented by Formula (I).
  • Non-limiting examples of such materials can include, but are not limited to, organosilanes represented by the following Formula (II):
  • R 3 independently for each “c” can be a hydrocarbyl group having 1 to 12 carbon atoms and a functional group.
  • the functional group can be sulfide, polysulfide or mercapto.
  • R 4 independently for each “d” can be a hydrocarbyl group having from 1 to 18 carbon atoms or hydrogen.
  • Each Y each can independently be halogen or an alkoxy group having 1 to 12 carbon atoms.
  • Subscript “c” can be 0, 1, 2, or 3; subscript “b” can be 0, 1, or 2; and c+d can be 1, 2, or 3. With some embodiments, there is the proviso that when b is 1 then a+b is 2 or 3.
  • the R 3 and R 4 groups of Formula (II) can be selected such that they can react with the polymeric composition in which the treated filler can be incorporated.
  • the sulfur-containing organosilane can include bis(alkoxysilylalkyl)polysulfides represented by following Formula (III):
  • alk represents a divalent hydrocarbon radical having from 1 to 18 carbon atoms; n′ is an integer from 2 to 12; and Z′ is:
  • R 5 is independently an alkyl group having from 1 to 4 carbon atoms or phenyl
  • each R 6 is independently an alkoxy group having from 1 to 8 carbon atoms, a cycloalkoxy group with from 5 to 8 carbon atoms, or a straight or branched chain alkylmercapto group with from 1 to 8 carbon atoms.
  • the R 5 and R 6 groups can be the same or different.
  • the divalent alk group can be straight or branched chain, a saturated or unsaturated aliphatic hydrocarbon group or a cyclic hydrocarbon group.
  • Non-limiting examples of bis(alkoxysilylalkyl)-polysulfides can include bis(2-trialkoxysilylethyl)-polysulfides in which the trialkoxy group can be trimethoxy, triethoxy, tri(methylethoxy), tripropoxy, tributoxy, etc. up to trioctyloxy and the polysulfide can be either di-, tri-, tetra-, penta-, or hexasulfide, or mixtures thereof.
  • Non-limiting examples can include the corresponding bis(3-trialkoxysilylpropyl)-, bis(3-trialkoxysilylisobutyl), -bis(4-trialkoxysilylbutyl)-, etc. up to bis(6-trialkoxysilyl-hexyl)-polysulfides.
  • bis(alkoxysilylalkyl)-polysulfides are described in U.S. Pat. No. 3,873,489, column 6, lines 5-55, and in U.S. Pat. No. 5,580,919, at column 11, lines 11-41.
  • Further non-limiting examples of such compounds can include: 3,3′ bis(trimethoxysilylpropyl)disulfide, 3,3′-bis(triethoxysilylpropyl)tetrasulfide,
  • M′ is silicon
  • L is halogen or —OR 8
  • Q is hydrogen, C 1 -C 12 alkyl, or halo-substituted C 1 -C 12 alkyl
  • R 7 is C 1 -C 12 alkylene
  • R 8 is C 1 -C 12 alkyl or alkoxyalkyl containing from 2 to 12 carbon atoms
  • the halogen or (halo) groups being chloro, bromo, iodo or fluoro
  • n is 1, 2 or 3.
  • mercaptoorganometallic reactants having two mercapto groups can be used.
  • Non-limiting examples of useful mercaptoorganometallic compounds include but are not limited to mercaptomethyltrimethoxysilane, mercaptoethyltrimethoxysilane, mercaptopropyltrimethoxysilane, mercaptomethyltriethoxysilane, mercaptoethyltripropoxysilane, mercaptopropyltriethoxysilane, (mercaptomethyl)dimethylethoxysilane, (mercaptomethyl)methyldiethoxysilane, 3-mercaptopropyl-methyldimethoxysilane, and mixtures thereof.
  • the sulfur-containing organosilane can be a mercaptoorganometallic compound such as a mercaptosilane different from the organosilane used in the treating composition of step (a), for example, mercaptopropyltrimethoxysilane and/or mercaptomethyltriethoxysilane.
  • the sulfur-containing organosilane represented by Formula (IV), which is different from the aforementioned organosilane coupling agent represented by Formula (I), that can be used in step (a) of the process of the present invention can be a mercaptoorganometallic compound in which the mercapto group is blocked, i.e., the mercapto hydrogen atom is replaced by another group.
  • Blocked mercaptoorganometallic compounds can have an unsaturated heteroatom or carbon bound directly to sulfur via a single bond.
  • Non-limiting examples of specific blocking groups can include thiocarboxylate ester, dithiocarbamate ester, thiosulfonate ester, thiosulfate ester, thiophosphate ester, thiophosphonate ester, and thiophosphinate ester.
  • a deblocking agent can be added to the polymeric compound mixture to deblock the blocked mercaptoorganometallic compound.
  • a catalyst such as, tertiary amines, Lewis acids or thiols, can be used to initiate and promote the loss of the blocking group by hydrolysis or alcoholysis to liberate the corresponding mercaptoorganometallic compounds.
  • Non-limiting examples of blocked mercaptosilanes can include but are not limited to 2-triethoxysilyl-1-ethyl thioacetate, 3-trimethoxy-silyl-1-propyl thiooctoate, bis-(3-triethoxysilyl-1-propyl)-methyldithiophosphonate, 3-triethoxysilyl-1-propyldimethylthiophosphinate, 3-triethoxysilyl-1-propylmethylthiosulfate, 3-triethoxysilyl-1-propyltoluenethiosulfonate, and mixtures thereof.
  • the amount of these optional sulfur-containing organosilanes can vary widely and can depend upon the particular material selected.
  • the amount of these optional sulfur-containing organosilanes can be greater than 0.1% based on the weight of untreated filler, such as from 0.5% to 25% based on the weight of untreated filler, or from 1% to 20%, or from 2% to 15%.
  • the treating composition can further include a halo-functional organosilane, which includes a monomeric, dimeric, oligomeric and/or or polymeric compound possessing halogen functionality and alkanedioxysilyl functionality derived from: (i) polyhydroxyl-containing compounds in which the alkanedioxy group is covalently bonded to a single Si atom through Si—O bonds to form a ring; and/or (ii) the alkanedioxy groups are covalently bonded to at least two Si atoms through Si—O bonds to form a dimer, oligomer, or polymer in which adjacent silyl units are bonded to each other through bridged alkanealkoxy structures.
  • halo-functional organosilanes are described in detail in United States Published Patent Application No. 2011/0003922A1, published Jan. 6, 2011, at paragraphs [0020] to [0057], the cited portions of which are incorporated by reference herein.
  • the treating composition can optionally further include a first or additional non-coupling agent/compatibilizer that is different from the treating agent.
  • the additional non-coupling agent/compatibilizer can be selected from saturated biopolymers, saturated fatty acids, saturated organic acids, saturated polymer emulsions, saturated polymer coating composition, and mixtures thereof.
  • the additional non-coupling agent/compatibilizer can alternatively or further include a surfactant selected from anionic, nonionic and amphoteric surfactants, and mixtures thereof. As used herein, the term surfactant excludes amino acid surfactants.
  • the additional non-coupling agent//compatibilizer can, with some embodiments, be present in an amount of from greater than 1% to 25% by weight based on the total weight of untreated filler, such as the total mass of SiO 2 which has been precipitated.
  • the additional non-coupling agent/compatibilizer can be chosen from salts of fatty acids, alkyl sarcosinates, salts of alkyl sarcosinates, and mixtures thereof. Specific non-limiting examples of such can be found in U.S. Pat. No. 7,569,107 at column 5, line 9, to column 7, line 21, the cited portions of which are incorporated by reference herein.
  • the additional non-coupling agent/compatibilizer can include one or more anionic surfactants selected from sodium stearate, ammonium stearate, ammonium cocoate, sodium laurate, sodium cocyl sarcosinate, sodium lauroyl sarcosinate, sodium soap of tallow, sodium soap of coconut, sodium myristoyl sarcosinate, and/or stearoyl sarcosine acid.
  • anionic surfactants selected from sodium stearate, ammonium stearate, ammonium cocoate, sodium laurate, sodium cocyl sarcosinate, sodium lauroyl sarcosinate, sodium soap of tallow, sodium soap of coconut, sodium myristoyl sarcosinate, and/or stearoyl sarcosine acid.
  • the additional non-coupling agent/compatibilizer is present in an amount of from greater than 1% up to and including 25% by weight, for example 2.0% to 20.0%, or 4% to 15%, or 5% to 12% by weight based on the total weight of the untreated filler, such as total mass of SiO 2 that has been precipitated.
  • the additional non-coupling agent/compatibilizer can be a non-coupling organosilane.
  • Non-limiting examples of non-coupling silanes from which the additional non-coupling agent/compatibilizer can selected include octadecyltriethoxysilane, octadecyltrichlorosilane, octadecyltrimethoxysilane, propyltriethoxysilane, propyltrimethoxysilane, propyltrichlorosilane, n-octyltrimethoxysilane, n-octyltriethoxysilane, n-octyltrichlorosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, and/or n-hexyltrichlorosilane.
  • any of the aforementioned organosilanes including the organosilane having the structure (I) as described above, can, with some embodiments, include partial hydrolyzates thereof.
  • the untreated filler used with various embodiments of the present invention can be prepared using any of a variety of art-recognized methods.
  • the untreated filler can prepared by combining an aqueous solution of soluble metal silicate with acid solution to form a silica slurry; the silica slurry optionally can be aged; acid or base can be added to the optionally aged silica slurry to adjust pH of the slurry; the silica slurry can be filtered, optionally washed, and then dried using art-recognized techniques.
  • a treatment composition such as any of those described above can be added at any step in the above-described process prior to drying in accordance with various embodiments of the present invention.
  • the present invention is directed to a process for producing a treated precipitated silica that includes:
  • step (d) forming an aqueous slurry of the dried precipitated silica of step (c) with the treatment composition that includes the treating agent to form a treated silica slurry;
  • an aqueous slurry of the dried precipitated silica (treated or untreated) can be prepared, and a treatment composition can then be added to form a treated slurry of precipitated silica, which is subsequently re-dried to produce a treated precipitated silica.
  • precipitated silica of any of the foregoing embodiments can be included in a polymer blend and compounded with a treatment composition as described previously herein.
  • Suitable metal silicates that can be used with some embodiments of the present invention can include a wide variety of materials known in the art. Non-limiting examples can include but are not limited to alumina silicate, lithium silicate, sodium silicate, potassium silicate, and mixtures thereof.
  • the metal silicate can be represented by the following structural formula: M 2 O(SiO2) x wherein M can be alumina, lithium, sodium or, potassium, and x can range from 0.1 to 4.
  • Suitable acids that can be used with some embodiments of the present invention can be selected from a wide variety of acids known in the art. Non-limiting examples can include but are not limited to mineral acids, organic acids, carbon dioxide, sulfuric acid, and mixtures thereof.
  • the treated fillers which are prepared by the processes of the present invention are suitable for inclusion in organic polymeric compositions.
  • the treated filler materials prepared by the process of the present invention are useful with some embodiments in rubber compounding compositions, such as rubber compositions used in the manufacture of tires and tire components such as tire treads.
  • Polymeric compositions into which treated fillers prepared according with the method of the present invention include, but are not limited to, those described in Kirk Othmer Encyclopedia of Chemical Technology , Fourth Edition, 1996, Volume 19, pp 881-904, which description is herein incorporated by reference.
  • the treated filler prepared in accordance with various embodiments of the present invention can be admixed with the polymer or the polymerizable components thereof while the physical form of the polymer or polymerizable components is in any liquid or compoundable form such as a solution, suspension, latex, dispersion, and the like.
  • the polymeric compositions containing the treated filler of the present invention can be milled, mixed, molded and, optionally, cured, by any manner known in the art, to form a polymeric article.
  • Classes of polymers can include but are not limited to thermoplastic and thermosetting resins, rubber compounds and other polymers having elastomeric properties.
  • the aforementioned polymers can include, for example, alkyd resins, oil modified alkyd resins, unsaturated polyesters, natural oils (e.g., linseed, tung, soybean), epoxides, nylons, thermoplastic polyester (e.g., polyethyleneterephthalate, polybutyleneterephthalate), polycarbonates, i.e., thermoplastic and thermoset, polyethylenes, polybutylenes, polystyrenes, polypropylenes, ethylene propylene co- and terpolymers, acrylics (homopolymer and copolymers of acrylic acid, acrylates, methacrylates, acrylamides, their salts, hydrohalides, etc.), phenolic resins, polyoxymethylene (homopolymers and copolymers), polyurethanes, polysulfones, polysulfide rubbers, nitrocelluloses, vinyl butyrates, vinyls (vinyl chloride and/or vinyl acetate containing polymers
  • the amount of treated filler that can be used in a polymeric composition can vary widely depending upon the polymeric composition and the desired properties of the article to be formed from the polymeric composition.
  • the amount of treated filler present in the polymeric composition can range from 5 up to 70 weight %, based on the total weight of the polymeric composition.
  • the polymeric composition can include an organic rubber.
  • organic rubber can include but are not limited to natural rubber; those formed from the homopolymerization of butadiene and its homologues and derivatives such as: cis-1,4-polyisoprene; 3,4-polyisoprene; cis-1,4-polybutadiene; trans-1,4-polybutadiene; 1,2-polybutadiene; and those formed from the copolymerization of butadiene and its homologues and derivatives with one or more copolymerizable monomers containing ethylenic unsaturation such as styrene and its derivatives, vinyl-pyridine and its derivatives, acrylonitrile, isobutylene and alkyl-substituted acrylates such as methyl methacrylate.
  • Non-limiting examples can include styrene-butadiene copolymer rubber composed of various percentages of styrene and butadiene and employing the various isomers of butadiene as desired (hereinafter “SBR”); terpolymers of styrene, isoprene and butadiene polymers, and their various isomers; acrylonitrile-based copolymer and terpolymer rubber compositions; and isobutylene-based rubber compositions; or a mixture thereof, as described in, for example, U.S. Pat. Nos. 4,530,959; 4,616,065; 4,748,199; 4,866,131; 4,894,420; 4,925,894; 5,082,901; and 5,162,409.
  • SBR styrene-butadiene copolymer rubber composed of various percentages of styrene and butadiene and employing the various isomers of butadiene as desired
  • SBR ter
  • Non-limiting examples of suitable organic polymers can include copolymers of ethylene with other high alpha olefins such as propylene, butene-1 and pentene-1 and a diene monomer.
  • the organic polymers can be block, random, or sequential and can be prepared by methods known in the art such as but not limited to emulsion (e.g. e-SBR) or solution polymerization processes (e.g., s-SBR).
  • Further non-limiting examples of polymers for use in the present invention can include those which are partially or fully functionalized including coupled or star-branched polymers.
  • organic rubbers can include polychloroprene, chlorobutyl and bromobutyl rubber as well as brominated isobutylene-co-paramethylstyrene rubber.
  • the organic rubber can be polybutadiene, s-SBR and mixtures thereof.
  • the polymeric composition can be a curable rubber.
  • curable rubber is intended to include natural rubber and its various raw and reclaimed forms as well as various synthetic rubbers.
  • curable rubber can include combinations of SBR and butadiene rubber (BR), SBR, BR and natural rubber and any other combinations of materials previously disclosed as organic rubbers.
  • BR butadiene rubber
  • rubber elastomer
  • rubbery elastomer can be used interchangeably, unless indicated otherwise.
  • the terms “rubber composition”, “compounded rubber” and “rubber compound” are used interchangeably to refer to rubber which has been blended or mixed with various ingredients and materials, and such terms are well-known to those having skill in the rubber mixing or rubber compounding art.
  • Rubber compositions that include the treated filler produced by the process of the present invention and can be used in the manufacture of a myriad of rubber articles, such as for example, a tire at least one component of which, e.g., the tread, comprises the cured rubber composition, as well as other rubber articles such as shoe soles, hoses, seals, cable jackets, gaskets, belts, and the like. Rubber compositions comprising the treated filler produced by the process of the present invention are particularly advantageous for use in the manufacture of tire treads exhibiting low rolling resistance and high wear resistance, including when the tire treads are based on natural rubber. Moreover, with some embodiments, lower cure temperatures can be achieved for such natural rubber compositions containing the treated filler produced by the process of the present invention.
  • the treated filler of the present invention (as a powder, granule, pellet, slurry, aqueous suspension or solvent suspension) may be combined with base material, i.e., material used in the product to be manufactured, to form a mixture referred to as a masterbatch.
  • base material i.e., material used in the product to be manufactured
  • the treated filler may be present in higher concentration than in the final product. Aliquots of this mixture are typically added to production-size quantities during mixing operations in order to aid in uniformly dispersing very small amounts of such additives to polymeric compositions, e.g., plastics, rubbers and coating compositions.
  • the treated filler may be combined with emulsion and/or solution polymers, e.g., organic rubber comprising solution styrene/butadiene (SBR), polybutadiene rubber or a mixture thereof, to form a masterbatch.
  • emulsion and/or solution polymers e.g., organic rubber comprising solution styrene/butadiene (SBR), polybutadiene rubber or a mixture thereof.
  • SBR solution styrene/butadiene
  • One contemplated embodiment is a masterbatch comprising a combination of organic rubber, water-immiscible solvent, treated filler and optionally, processing oil.
  • Such a product may be supplied by a rubber producer to a tire manufacturer.
  • the benefit to the tire manufacturer of using a masterbatch is that the treated filler is uniformly dispersed in the rubber, which results in minimizing the mixing time to produce the compounded rubber.
  • the masterbatch may contain from 10 to 150 parts of treated silica per 100 parts of rubber (phr), preferably, from 20 to 130 phr, more preferably, from 30 to 100 phr, and most preferably, from 50 to 80 phr.
  • the silica CTAB surface area values reported in the examples of this application were determined using a CTAB solution and the hereinafter described method.
  • the analysis was performed using a Metrohm 751 Titrino automatic titrator, equipped with a Metrohm Interchangeable “Snap-In” 50 milliliter burette and a Brinkmann Probe Colorimeter Model PC 910 equipped with a 550 nm filter.
  • a Mettler Toledo HB43 or equivalent was used to determine the 105° C. moisture loss of the silica and a Fisher Scientific CentrificTM Centrifuge Model 225 was used for separating the silica and the residual CTAB solution.
  • the excess CTAB was determined by auto titration with a solution of AEROSOL® OT (dioctylsodium sulfosuccinate, available from Cytec Industries, Inc.) until maximum turbidity was attained, which was detected with the probe colorimeter. The maximum turbidity point was taken as corresponding to a millivolt reading of 150. Knowing the quantity of CTAB adsorbed for a given weight of silica and the space occupied by the CTAB molecule, the external specific surface area of the silica was calculated and reported as square meters per gram on a dry-weight basis.
  • AEROSOL® OT dioctylsodium sulfosuccinate, available from Cytec Industries, Inc.
  • Solutions required for testing and preparation included a buffer of pH 9.6, cetyl [hexadecyl]trimethyl ammonium bromide (CTAB, also known as hexadecyl trimethyl ammonium bromide, technical grade), AEROSOL® OT and 1N sodium hydroxide.
  • the buffer solution of pH 9.6 was prepared by dissolving 3.101 g of orthoboric acid (99%; technical grade, crystalline) in a one-liter volumetric flask, containing 500 milliliters of deionized water and 3.708 grams of potassium chloride solids (Fisher Scientific, Inc., technical grade, crystalline). Using a burette, 36.85 milliliters of the 1N sodium hydroxide solution was added. The solution was mixed and diluted to volume.
  • the CTAB solution was prepared using 11.0 g + ⁇ 0.005 g of powdered CTAB onto a weighing dish.
  • the CTAB powder was transferred to a 2-liter beaker and the weighing dish was rinsed with deionized water.
  • Approximately 700 milliliters of the pH 9.6 buffer solution and 1000 milliliters of distilled or deionized water was added to the 2-liter beaker and stirred with a magnetic stir bar.
  • a large watch glass was placed on the beaker and the beaker was stirred at room temperature until the CTAB powder was totally dissolved.
  • the solution was transferred to a 2-liter volumetric flask, rinsing the beaker and stir bar with deionized water.
  • the bubbles were allowed to dissipate, and the solution diluted to volume with deionized water. A large stir bar was added and the solution mixed on a magnetic stirrer for approximately 10 hours. The CTAB solution can be used after 24 hours and for only 15 days.
  • the AEROSOL® OT solution was prepared using 3.46 g + ⁇ 0.005 g, which was placed onto a weighing dish. The AEROSOL® OT on the weighing dish was rinsed into a 2-liter beaker, which contained about 1500 milliliter deionized water and a large stir bar. The AEROSOL® OT solution was dissolved and rinsed into a 2-liter volumetric flask. The solution was diluted to the 2-liter volume mark in the volumetric flask. The AEROSOL® OT solution was allowed to age for a minimum of 12 days prior to use. The shelf life of the AEROSOL® OT solution is 2 months from the preparation date.
  • the pH of the CTAB solution was verified and adjusted to a pH of 9.6 + ⁇ 0.1 using 1N sodium hydroxide solution.
  • the burette tip and the colorimeter probe were placed just below the surface of the solution, positioned such that the tip and the photo probe path length were completely submerged. Both the tip and photo probe were essentially equidistant from the bottom of the beaker and not touching one another.
  • minimum stirring setting of 1 on the Metrohm 728 stirrer
  • the colorimeter was set to 100% T prior to every blank and sample determination and titration was initiated with the AEROSOL® OT solution. The end point was recorded as the volume (ml) of titrant at 150 mV.
  • the CTAB solution was pipetted into a clean container minus the separated solids, referred to as the “centrifugate”.
  • the centrifugate For sample analysis, 50 milliliters of deionized water was placed into a 150-milliliter beaker containing a stir bar. Then 10 milliliters of the sample centrifugate was pipetted for analysis into the same beaker. The sample was analyzed using the same technique and programmed procedure as used for the blank solution.
  • the BET surface area values reported in the examples of this application were determined in accordance with the Brunauer-Emmet-Teller (BET) method in accordance with ASTM D1993-03.
  • the BET surface area was determined by fitting five relative-pressure points from a nitrogen sorption isotherm measurement made with a Micromeritics TriStar 3000TM instrument.
  • a flow Prep-060TM station provided heat and a continuous gas flow to prepare samples for analysis. Prior to nitrogen sorption, the silica samples were dried by heating to a temperature of 160° C. in flowing nitrogen (P5 grade) for at least one (1) hour.
  • the weight percent carbon (C) and sulfur (S) values reported in the examples of this application were determined using a Flash 2000 elemental analyzer. This system was set up to monitor carbon and sulfur. Typical parameters included: the combustion furnace being set to 950° C., the GC oven temperature being set to 65° C., the carrier helium gas flow rate being set to 140 mL/min, the reference helium gas flow rate being set to 100 mL/min, the oxygen flow rate being set to 250 mL/min and oxygen injection time of 5 seconds. For a given run, calibration standards, samples, and controls were typically run. To each 8-10 mg of vanadium pentoxide (V 2 O 5 ) was added. The sample size was between 2-4 mg and they were sealed in tin capsules prior to analysis. If the control standard was not within ⁇ 10% relative of the known accepted value or the samples run in duplicate do not match ( ⁇ 5% relative), the entire sample run was reanalyzed.
  • V 2 O 5 vanadium pentoxide
  • the weight percent mercaptan (SH) values reported in the examples of this application were determined using a back-titration method.
  • the samples were dispersed in 75 mL of 2-propanol, followed by addition of excess 0.1N Iodine solution.
  • the test solution was then flushed with nitrogen, capped and allowed to stir for 15 minutes.
  • the unreacted iodine was subsequently back-titrated with standardized 0.05N sodium thiosulfate to a colorless end point.
  • Sodium silicate (50.4 liters) and 3.2 liters of sulfuric acid were added simultaneously over a period of 90 minutes.
  • the sodium silicate was added via an open tube near the bottom of the tank at a rate of 560 ml/min and the sulfuric acid was added directly above the secondary high speed mixer blades.
  • the acid addition rate averaged 36.0 ml/min over the course of the 90 minute simultaneous addition step.
  • a 100 minute age step was initiated.
  • the pH of the solution was adjusted to 8.5 using sulfuric acid.
  • the secondary high speed agitator was turned off.
  • Sodium stearate, 1244 g was sprinkled into the reactor slowly over the course of 15-20 minutes.
  • the reaction mixture completed ageing under stirring for the remainder of the 100 minutes.
  • the temperature was maintained at 87° C.
  • sulfuric acid was added to reach a final batch pH of 4.8.
  • the mixture was pumped into a filter press and washed until the conductivity of the rinse water measured less than 1000 microsiemens. About 75% of the expected initial silica mass was recovered and transferred back into a 150 L reactor. Approximately 20 L of city water at ambient temperature were added and the filter cake was re-liquefied using the main agitator. At this point, 710 grams of L-cysteine hydrochloride monohydrate were added at a treatment ratio of ⁇ 7.0 parts per hundred of silica (PHS). The pH was raised to 4.0 with 50% NaOH and the left to sit for 48 hours before being sent back through the filter press until the rinse water reached a conductivity of 1000 microsiemens.
  • the resulting filter cake was reslurried with water to form a pumpable slurry and spray dried using a Niro spray drier (Utility Model 5 with Type FU-1 rotary atomizer, purchased from Niro, Inc.).
  • the physical properties of the synthesized silicas are summarized in Table 1, demonstrating that the amino acid cysteine places a measurable sulfur content on the silica surface.
  • Example A inventive and comparative silicas The model passenger tread formulations used to compare the Example A inventive and comparative silicas is shown in Table 2.
  • the formulations were mixed using one non-productive pass, allowing the compound to cool, followed by a mill finish on a two roll mill.
  • the mixer speed was adjusted to 85 rpm and a starting temperature of 150° F.
  • Both the solution SBR, BUNA® VSL 5228-2 (vinyl content: 52%; styrene content: 28%; Treated Distillate Aromatic Extract (TDAE) oil content: 37.5 parts per hundred rubber (phr); Mooney viscosity (ML(1+4)100°) C.): 50) obtained commercially from LANXESS, and butadiene rubber (BR), BUDENETM 1207 (cis 1,4 content 98%; Mooney viscosity (ML(1+4)100°) C.): 55) obtained commercially from The Goodyear Tire & Rubber Company, polymers were added to the mixer.
  • RM sulfur Rubber Makers sulfur
  • 100% active obtained commercially from Taber, Inc.
  • SANTOCURE® CBS SANTOCURE® CBS
  • n-cyclohexyl-2-benzothiazolesulfenamide obtained commercially from Harwick Standard
  • diphenylguanidine obtained commercially from Harwick Standard Inc.
  • the cysteine material without coupling agent Si-69 produces a compound that has a lower Mooney viscosity ML (1+4) than the comparative control, improved toughness, similar rolling resistance and a reduction in the filler-filler interaction.
  • Si-69 is used in combination with cysteine, a drop in the rolling resistance (as indicated by tangent delta at 60° C.) is observed and a lower elongation is seen indicating that reinforcement is given by the cysteine.
  • Precipitated silica slurry was produced through the sulfuric acid neutralization of a sodium silicate. This slurry was filtered and washed to produce a filter cake. This filter cake was mixed with a Cowles blade to form a solid in liquid suspension. The percent solids of this liquefied slurry was determined and used to determine the amount of treatment applied for the respective examples according to Equation 1.
  • the L-arginine (98.5%+; Sigma Aldrich) was added and mixed with a Cowles blade for a minimum of 10 minutes.
  • This treated slurry was than dried in a Niro spray drier (inlet temperature about 400° C.; outlet temperature about 105° C.). The moisture content of the spray dried powders was between 4-7 weight percent.
  • the spray dried powders were granulated using an Alexanderwerk WP 120 ⁇ 40 Roller Compactor using a feed screw speed of 54.5 rpm, a roll compactor speed of 4.6 rpm, a crusher speed of 55.0 rpm, a screen gap of 1.5 mm, a vacuum pressure of 26.2 BAR and at a granulation pressure of 20 BAR.
  • the physical and chemical properties are shown in Table 4.
  • Treatment(g) Weight of slurry(g)*solids(wt. %/100)*1.00% Equation 1:
  • the silica was mixed in the rubber compound indicated in Example A.
  • the properties of the rubber compounds are shown in Table 5.

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