WO2012006133A1 - Cellulose ester and cellulose esters/elastomer compositions and processes for making - Google Patents
Cellulose ester and cellulose esters/elastomer compositions and processes for making Download PDFInfo
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- WO2012006133A1 WO2012006133A1 PCT/US2011/042266 US2011042266W WO2012006133A1 WO 2012006133 A1 WO2012006133 A1 WO 2012006133A1 US 2011042266 W US2011042266 W US 2011042266W WO 2012006133 A1 WO2012006133 A1 WO 2012006133A1
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
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- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/12—Cellulose acetate
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- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/10—Esters of organic acids, i.e. acylates
- C08L1/14—Mixed esters, e.g. cellulose acetate-butyrate
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- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/16—Esters of inorganic acids
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/16—Esters of inorganic acids
- C08L1/18—Cellulose nitrate, i.e. nitrocellulose
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- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/20—Esters of both organic acids and inorganic acids
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/22—Cellulose xanthate
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/22—Cellulose xanthate
- C08L1/24—Viscose
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/32—Cellulose ether-esters
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- 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
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- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
Definitions
- This invention belongs to the field of cellulose ester chemistry, particularly to cellulose esters comprising compatibilizers and optionally, plasticizers.
- the invention also belongs to the field of cellulose
- ester/elastomer compositions comprising at least one elastomer and at least one additive wherein the additive is at least one selected from the group consisting of a compatibilizer and a plasticizer.
- Processes for producing the cellulose ester compositions and the cellulose ester/elastomer compositions are also provided.
- This invention relates to the dispersion of cellulose esters in elastomers as small particles to improve the mechanical and physical properties of the elastomer.
- Polar cellulose esters CE are incompatible with non-polar elastomers.
- high melting cellulose esters do not melt at typical melt processing temperature of elastomers. These factors make dispersion of cellulose esters into elastomers difficult via most industrially utilized melt mixing process. Due to the above problems, cellulose esters are not an obvious choice as an additive to non-polar elastomers.
- This invention can overcome these difficulties by using plasticizers where necessary to help reduce the melt temperature of cellulose esters and by using compatibilizers to help improve mixing and compatibility of cellulose esters and elastomers.
- compatibilizers can also improve mechanical and physical properties of the cellulose ester/elastomer compositions by improving the interfacial interaction/bonding between the cellulose ester and the elastomer.
- These cellulose ester/elastomer compositions can be used in rubber/elastomeric applications ranging from tires, hoses, belts, gaskets, automotive parts, and the like.
- a process of dispersing cellulose esters in elastomers involves melting or softening cellulose esters so that the cellulose esters can flow and subsequently break down into small particles (dispersion) under shear processing. After dispersion, the cellulose esters can re-solidify upon cooling to room temperature to reinforce the rubber.
- a cellulose ester composition comprising at least one cellulose ester, at least one compatibilizer, and optionally, and at least one plasticizer.
- a cellulose ester/elastomer composition comprising at least one elastomer, at least one cellulose ester, and at least one additive; wherein the additive is at least one selected from the group consisting of a compatibilizer and a plasticizer.
- a process for producing the cellulose ester composition comprising contacting at least one cellulose ester, at least one compatibilizer, and optionally, at least one plasticizer.
- a process for producing a cellulose ester/elastomer composition comprising mixing at least one elastomer, at least one cellulose ester, and at least one additive for a sufficient time and temperature to disperse the cellulose ester to produce the cellulose ester/elastomer composition; wherein the additive is at least one selected from the group consisting of a compatibilizer and a plasticizer.
- a cellulose ester composition comprising at least one cellulose ester, at least one compatibilizer, and optionally, at least one plasticizer.
- the cellulose ester utilized in this invention can be any that is known in the art.
- the cellulose esters of the present invention generally comprise repeating units of the structure:
- R , R , and R are selected independently from the group consisting of hydrogen or straight chain alkanoyi having from 2 to 10 carbon atoms.
- the substitution level is usually express in terms of degree of substitution (DS), which is the average number of substitutents per anhydroglucose unit (AGU).
- AGU anhydroglucose unit
- conventional cellulose contains three hydroxyl groups in each AGU unit that can be substituted; therefore DS can have a value between zero and three.
- low molecular weight cellulose mixed esters can have a total degree of substitution ranged from about 3.08 to about 3.5.
- Native cellulose is a large polysaccharide with a degree of polymerization from 700 - 2,000, and thus the assumption that the maximum DS is 3.0 is approximately correct.
- DS is a statistical mean value, a value of 1 does not assure that every AGU has a single substitutent. In some cases, there can be unsubstituted anhydroglucose units, some with two and some with three substitutents, and more often than not the value will be a noninteger. Total DS is defined as the average number of all of substituents per anhydroglucose unit.
- the degree of substitution per AGU can also refer to a particular substitutent, such as, for example, hydroxyl, acetyl, butyryl, or propionyl.
- the cellulose ester utilized can be a cellulose triester or a secondary cellulose ester.
- cellulose triesters include, but are not limited to, cellulose triacetate, cellulose tripropionate, or cellulose tributyrate.
- secondary cellulose esters include cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate. These cellulose esters are described in U.S. Patents 1 ,698,049; 1 ,683,347; 1 ,880,808; 1 ,880,560;
- the cellulose esters have at least 2 anhydroglucose rings and typically have between 2 and 5,000
- anhydroglucose rings The number of anhydroglucose units per molecule is defined as the degree of polymerization (DP) of the cellulose ester.
- Cellulose esters typically have an inherent viscosity (IV) of about 0.2 to about 3.0 deciliters/gram or about 1 to about 1 .5, as measured at a temperature of 25°C for a 0.25 gram sample in 100 ml of a 60/40 by weight solution of
- the total degree of substitution per anhydroglucose unit (DS/AGU) of the cellulose esters useful herein can range from about 0.5 to about 2.8, from about 1 .5 to about 3.0, and from about 1 .7 to about 2.7.
- cellulose esters include, but are not limited to, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate (CAP), cellulose acetate butyrate (CAB), cellulose propionate butyrate, and the like.
- Cellulose acetate useful herein typically has a DS/AGU for acetyl of about 2.0 to about 2.5.
- CAP and CAB typically have a total DS/AGU of about 1 .7 to about 2.8.
- Cellulose esters can be produced by any method known in the art. Examples of processes for producing cellulose esters are taught in Kirk- Othmer, Encyclopedia of Chemical Technology, 5 th Edition, Vol. 5, Wiley- Interscience, New York (2004), pp. 394-444. Cellulose, the starting material for producing cellulose esters, can be obtained in different grades and sources such as from cotton linters, softwood pulp, hardwood pulp, corn fiber and other agricultural sources, and bacterial cellulose, among others.
- cellulose esters One method of producing cellulose esters is esterification of the cellulose by mixing cellulose with the appropriate organic acids, acid anhydrides, and catalysts. Cellulose is then converted to a cellulose triester. Ester hydrolysis is then performed by adding a water-acid mixture to the cellulose triester, which can then be filtered to remove any gel particles or fibers. Water is then added to the mixture to precipitate the cellulose ester. The cellulose ester can then be washed with water to remove reaction byproducts followed by dewatering and drying.
- the cellulose triesters to be hydrolyzed can have three substitutents selected independently from alkanoyls having from 2 to 10 carbon atoms.
- Examples of cellulose triesters include cellulose triacetate, cellulose tripropionate, and cellulose tributyrate or mixed triesters of cellulose such as cellulose acetate propionate, and cellulose acetate butyrate.
- These cellulose esters can be prepared by a number of methods known to those skilled in the art.
- cellulose esters can be prepared by heterogeneous acylation of cellulose in a mixture of carboxylic acid and anhydride in the presence of a catalyst such as H 2 SO 4 .
- Cellulose triesters can also be prepared by the homogeneous acylation of cellulose dissolved in an appropriate solvent such as LiCI/DMAc or LiCI/NMP.
- cellulose triesters also encompasses cellulose esters that are not completely substituted with acyl groups.
- cellulose triacetate commercially available from Eastman Chemical Company, Inc., Kingsport, TN, U.S.A., typically has a DS from about 2.85 to about 2.95.
- acyl substitutents After esterification of the cellulose to the triester, part of the acyl substitutents are removed by hydrolysis or by alcoholysis to give a secondary cellulose ester.
- the distribution of the acyl substituents can be random or non- random.
- Secondary cellulose esters can also be prepared directly with no hydrolysis by using a limiting amount of acylating reagent. This process is particularly useful when the reaction is conducted in a solvent that will dissolve cellulose. All of these methods yield cellulose esters that are useful in this invention.
- the secondary cellulose esters useful in the present invention have a weight average molecular weight (Mw) from about 5,000 to about 400,000 as measured by GPC. In a further embodiment, the Mw is from about 10,000 to about 300,000. In yet further embodiments, the Mw ranges from about 10,000 to about 250,000; from about 10,000 to about 100,000, and from about 15,000 to about 80,000.
- Mw weight average molecular weight
- the most common commercial secondary cellulose esters are prepared by initial acid catalyzed heterogeneous acylation of cellulose to form the cellulose triester. After a homogeneous solution in the corresponding carboxylic acid of the cellulose triester is obtained, the cellulose triester is then subjected to hydrolysis until the desired degree of substitution is obtained. After isolation, a randomly secondary cellulose ester is obtained. That is, the relative degree of substitution (RDS) at each hydroxyl is roughly equal.
- RDS relative degree of substitution
- low molecular weight mixed cellulose esters can be utilized as disclosed in U.S. Patent Application Serial No. 10/796,176, herein incorporated by reference to the extent it does not contradict the statements herein.
- the low molecular weight mixed cellulose ester has the following properties: a total degree of substitution per anhydroglucose unit of from about 3.08 to about 3.50, having the following substitutions: a degree of substitution per anhydroglucose unit of hydroxyl of no more than about 0.70,
- a degree of substitution per anhydroglucose unit of acetyl of from about 1 .20 to about 2.34;
- M w weight average molecular weight
- the low molecular weight cellulose mixed ester has the following properties:
- a degree of substitution per anhydroglucose unit of acetyl of from about 0.20 to about 0.80;
- M w weight average molecular weight
- the low molecular weight cellulose mixed ester has the following properties: a total degree of substitution per anhydroglucose unit of from about 3.08 to about 3.50, having the following substitutions:
- a degree of substitution per anhydroglucose unit of acetyl of from about 0.10 to about 0.50;
- M w weight average molecular weight
- the cellulose esters useful in the present invention can be prepared using techniques known in the art and can be commercially obtained, e.g., from Eastman Chemical Company, Kingsport, TN, U.S.A.
- the cellulose esters utilized in this invention can also contain chemical functionality and are described herein as either derivatized, modified, or functionalized cellulose esters.
- Functionalized cellulose esters are produced by reacting the free hydroxyl groups of cellulose esters with a bifunctional reactant that has one linking group for grafting to the cellulose ester and one functional group to provide a new chemical group to the cellulose ester.
- bifunctional reactants include succinic anhydride which links through an ester bond and provides acid functionality; mercaptosilanes which links through alkoxysilane bonds and provides mercapto functionality; and isocyanotoethyl methacrylate which links through a urethane bond and gives methacrylate functionality.
- functionalized cellulose esters are produced by reacting the free hydroxyl groups of the cellulose esters with a bifunctional reactant producing a cellulose ester with at least one functional group selected from the group consisting of unsaturation (double bonds), carboxylic acids, acetoacetate, acetoacetate imide, mercapto, melamine, and long alkyl chains.
- the cellulose esters containing unsaturation is produced by reacting a cellulose ester containing residual hydroxyl groups with an acrylic based compound and m- isopropyenyl-a,a'-dimethylbenzyl isocyanate.
- the grafted cellulose ester is a urethane-containing product having pendant (meth)acrylate and a- methylstyrene moieties.
- the cellulose esters containing unsaturation is produced by reacting maleic anhydride and a cellulose ester in the presence of an alkaline earth metal or ammonium salt of a lower alkyl monocarboxylic acid catalyst, and at least one saturated monocarboxylic acid have 2 to 4 carbon atoms.
- the cellulose esters containing unsaturation is produced from the reaction product of (a) at least one cellulosic polymer having isocyanate reactive hydroxyl functionality, and (b) at least one hydroxyl reactive poly(alpha,beta
- the cellulose esters containing carboxylic acid functionality is produced by reacting a cellulose ester and a mono- or di-ester of maleic or furmaric acid, thereby obtaining a cellulose derivative having double bond functionality.
- the cellulose esters containing carboxylic acid functionality has a first and second residue, wherein the first residue is a residue of a cyclic dicarboxylic acid anhydride and the second residue is a residue of an oleophilic
- the cellulose esters containing carboxylic acid functionality are cellulose acetate phthalates, which can be prepared by reacting cellulose acetate with phthalic anhydride.
- the cellulose esters containing acetoacetate functionality are described in U.S. Patent 5,292,877; which is incorporated by reference to the extent it does not contradict the statements herein.
- the cellulose esters containing acetoacetate functionality are produced by contacting: (i) cellulose; (ii) diketene, an alkyl acetoacetate, 2,2,6, trimethyl-4H 1 ,3-dioxin-4-one, or a mixture thereof, (iii) a solubilizing amount of solvent system comprising lithium chloride plus a carboxamide selected from the group consisting of 1 -methyl-2-pyrolidinone, N,N dimethylacetamide, or a mixture thereof.
- acetoacetate imide functionality are described in U.S. Patent 6,369,214 which is incorporated by reference to the extent it does not contradict the statements herein.
- Cellulose esters containing acetoacetate imide functionality are the reaction product of a cellulose ester and at least one acetoacetyl group and an amine functional compound comprising at least one primary amine.
- the cellulose ester is grafted with a silicon- containing thiol component which is either commercially available or can be prepared by procedures known in the art.
- silicon-containing thiol compounds include, but are not limited to, (3- mercaptopropyl)trimethoxysilane, (3-mercaptopropyl)-dimethyl-methoxysilane, (3-mercaptopropyl)dimethoxymethylsilane, (3- mercaptopropyl)dimethylchlorosilane, (3- mercaptopropyl)dimethylethoxysilane, (3-mercaptopropyl)diethyoxy- methylsilane, and (3-mercapto-propyl)triethoxysilane.
- the cellulose esters containing melamine functionality are prepared by reacting a cellulose ester with a melamine compound to form a grafted cellulose ester having melamine moieties grafted to the backbone of the anhydrogluclose rings of the cellulose ester.
- the melamine compound is selected from the group consisting of methylol ethers of melamine and aminoplast resins.
- the cellulose esters containing long alkyl chain functionality is produced by reaction of cellulose in a carboxamide diluents or a urea-based diluents with an acylating reagent using a titanium-containing specifies.
- Cellulose esters containing long alkyl chain functionality can be selected from the group consisting of cellulose acetate hexanoate, cellulose acetate nonanoate, cellulose acetate laurate, cellulose palmitate, cellulose acetate stearate, cellulose nonanoate, cellulose hexanoate, cellulose hexanoate propionate, and cellulose nonanoate propionate.
- the plasticizer utilized in this invention can be any that is known in the art that can reduce the melt temperature and/or the melt viscosity of the cellulose ester.
- the plasticizer can be either monomeric or polymeric in structure.
- the plasticizer is at least one selected from the group consisting of a phosphate plasticizer, benzoate plasticizer, adipate plasticizer, a phthalate plasticizer, a glycolic acid ester, a citric acid ester plasticizer and a hydroxyl-functional plasticizer.
- the plasticizer can be selected from at least one of the following: triphenyl phosphate, tricresyl phosphate, cresyldiphenyl phosphate, octyldiphenyl phosphate, diphenylbiphenyl phosphate, trioctyl phosphate, tributyl phosphate, diethyl phthalate, dimethoxyethyl phthalate, dimethyl phthalate, dioctyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate, butylbenzyl phthalate, dibenzyl phthalate, butyl phthalyl butyl glycolate, ethyl phthalyl ethyl glycolate, methyl phthalyl ethyl glycolate, triethyl citrate, tri-n-butyl citrate, acetyltriethyl citrate, acetyl-tri
- the plasticizer can be selected from at least one of the following: esters comprising: (i) acid residues comprising one or more residues of: phthalic acid, adipic acid, trimellitic acid, succinic acid, benzoic acid, azelaic acid, terephthalic acid, isophthalic acid, butyric acid, glutaric acid, citric acid or phosphoric acid; and (ii) alcohol residues comprising one or more residues of an aliphatic, cycloaliphatic, or aromatic alcohol containing up to about 20 carbon atoms.
- the plasticizer can be selected from at least one of the following: esters comprising: (i) at least one acid residue selected from the group consisting of phthalic acid, adipic acid, trimellitic acid, succinic acid, benzoic acid, azelaic acid, terephthalic acid, isophthalic acid, butyric acid, glutaric acid, citric acid and phosphoric acid; and (ii) at least one alcohol residue selected from the group consisting of aliphatic, cycloaliphatic, and aromatic alcohol containing up to about 20 carbon atoms.
- esters comprising: (i) at least one acid residue selected from the group consisting of phthalic acid, adipic acid, trimellitic acid, succinic acid, benzoic acid, azelaic acid, terephthalic acid, isophthalic acid, butyric acid, glutaric acid, citric acid and phosphoric acid; and (ii) at least one alcohol residue selected from the group consisting of aliphatic, cyclo
- the plasticizer can comprise alcohol residues where the alcohol residues is at least one selected from the following: stearyl alcohol, lauryl alcohol, phenol, benzyl alcohol,
- hydroquinone hydroquinone, catechol, resorcinol, ethylene glycol, neopentyl glycol, 1 ,4- cyclohexanedimethanol, and diethylene glycol.
- the plasticizer can be selected from at least one of the following: benzoates, phthalates, phosphates, arylene-bis(diaryl phosphate), and isophthalates.
- the plasticizer comprises diethylene glycol dibenzoate, abbreviated herein as "DEGDB”.
- the plasticizer can be selected from at least one of the following: aliphatic polyesters comprising C 2 -io diacid residues, for example, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid; and C 2- i o diol residues.
- the plasticizer can comprise diol residues which can be residues of at least one of the following C 2 -Ci 0 diols: ethylene glycol, diethylene glycol, 1 ,2-propylene glycol, 1 ,3-propylene glycol, 1 ,2- butylene glycol, 1 ,3-butylene glycol, 1 ,4-butylene glycol, neopentyl glycol, 1 ,5- pentanediol, 1 ,6 hexanediol, 1 ,5-pentylene glycol, triethylene glycol, and tetraethylene glycol.
- C 2 -Ci 0 diols ethylene glycol, diethylene glycol, 1 ,2-propylene glycol, 1 ,3-propylene glycol, 1 ,2- butylene glycol, 1 ,3-butylene glycol, 1 ,4-butylene glycol, neopentyl glycol, 1 ,5-
- the plasticizer can include polyglycols, such as, for example, polyethylene glycol, polypropylene glycol, and polybutylene glycol. These can range from low molecular weight dimers and trimers to high molecular weight oligomers and polymers. In one embodiment, the molecular weight of the polyglycol can range from about 200 to about 2000.
- the plasticizer comprises at least one of the following: Resoflex ® R296 plasticizer, Resoflex ® 804 plastocizer, SHP (sorbitol hexapropionate), XPP(xylitol pentapropionate), XPA(xylitol pentaacetate), GPP(glucose pentaacetate), GPA (glucose pentapropionate) and APP (arabitol pentapropionate).
- the plasticizer comprises one or more of: A) from about 5 to about 95 weight % of a C 2 -Ci 2 carbohydrate organic ester, wherein the carbohydrate comprises from about 1 to about 3 monosaccharide units; and B) from about 5 to about 95 weight % of a C 2 -C-
- the polyol ester does not comprise or contain a polyol acetate or polyol acetates.
- the plasticizer comprises at least one carbohydrate ester and the carbohydrate portion of the carbohydrate ester is derived from one or more compounds selected from the group consisting of glucose, galactose, mannose, xylose, arabinose, lactose, fructose, sorbose, sucrose, cellobiose, cellotriose and raffinose.
- the plasticizer comprises at least one carbohydrate ester and the carbohydrate portion of the
- carbohydrate ester comprises one or more of a-glucose pentaacetate, ⁇ - glucose pentaacetate, a -glucose pentapropionate, ⁇ -glucose
- the plasticizer comprises at least one carbohydrate ester and the carbohydrate portion of the carbohydrate ester comprises an a-anomer, a ⁇ -anomer or a mixture thereof.
- the plasticizer can be a solid, non-crystalline resin. These resins can contain some amount of aromatic or polar functionality and can lower the melt viscosity of the cellulose esters.
- the plasticizer can be a solid, noncrystalline compound (resin), such as, for example, rosin; hydrogenated rosin; stabilized rosin, and their monofunctional alcohol esters or polyol esters; a modified rosin including, but not limited to, maleic- and phenol-modified rosins and their esters; terpene resins; phenol-modified terpene resins; coumarin- indene resins; phenolic resins; alkylphenol-acetylene resins; and phenol- formaldehyde resins.
- resin such as, for example, rosin; hydrogenated rosin; stabilized rosin, and their monofunctional alcohol esters or polyol esters; a modified rosin including, but not limited to, maleic- and phenol-modified rosins and
- the amount of plasticizer in the cellulose ester composition can range from about 1 to about 50 weight percent based on the weight of the cellulose ester. Another range can be from about 5 to about 35 weight percent based on the weight of the cellulose ester.
- the compatibilizer can be either a non-reactive compatibilizer or a reactive compatibilizer.
- the compatibilizer can enhance the ability of the cellulose ester to reach a desired small particle size to improve the dispersion of the cellulose ester into an elastomer.
- the compatibilizers used can also improve mechanical and physical properties of the cellulose ester/elastomer compositions by improving the interfacial interaction/bonding between the cellulose ester and the elastomer.
- the compatibilizer When non-reactive compatibilizers are utilized, the compatibilizer contains a first segment that is compatible with the cellulose ester and a second segment that is compatible with a nonpolar elastomer.
- the first segment contains polar functional groups, which provide compatibility with the cellulose ester, including, but not limited to, such polar functional groups as ethers, esters, amides, alcohols, amines, ketones and acetals.
- the first segment may consist of oligomers or polymers of the following: cellulose esters; cellulose ethers; polyoxyalkylene, such as, polyoxyethylene, polyoxypropylene, polyoxybutylene; polyglycols, such as, polyethylene glycol, polypropylene glycol, polybutylene glycol; polyesters, such as,
- polycaprolactone polylactic acid, aliphatic polyesters, aliphatic-aromatic copolyesters; polyacrylates and polymethacrylates; polyacetals;
- the first segment is polyoxyethylene or polyvinyl alcohol.
- the second segment is compatible with the nonpolar elastomer and contains nonpolar groups.
- the second segment can be either saturated or unsaturated hydrocarbon groups or contain both saturated and unsaturated hydrocarbon groups.
- the second segment can be an oligomer or a polymer.
- the second segment of the non-reactive compatibilizer is selected from the group consisting of polyolefins, polydienes, polyaromatics , and copolymers.
- An example of a polyaromatic second segment is polystyrene.
- An example of a copolymer second segment is styrene/butadiene copolymer.
- the first and second segments of the non-reactive compatibilizers can be in a diblock, triblock, branched or comb structure.
- the molecular weight of the non-reactive compatibilizers can range from about 300 to about 20,000 or from about 500 to about 10,000 or from about 1 ,000 to about 5,000.
- the segment ratio of the non-reactive compatibilizers can range from about 15 to about 85% polar first segments to about 15 to about 85% nonpolar second segments.
- non-reactive compatibilizers include, but are not limited to, ethoxylated alcohols, ethoxylated alkylphenols, ethoxylated fatty acids, block polymers of propylene oxide and ethylene oxide, polyglycerol esters, polysaccharide esters, and sorbitan esters.
- ethoxylated alcohols are C-n-C-15 secondary alcohol ethoxylates, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and C-
- Cn-ds secondary ethyoxylates can be obtained as Dow Tergitol ® 15S from the Dow Chemical Company.
- Polyoxyethlene cetyl ether and polyoxyethylene stearyl ether can be obtained from ICI Surfactants under the Brij ® series of products.
- 4 natural linear alcohol ethoxylated with ethylene oxide can be obtained from Hoechst Celanese under the Genapol ® series of products.
- Examples of ethoxylated alkylphenols include
- poly(ethyleneoxy)ethanol Octylphenoxy poly(ethyleneoxy)ethanol can be obtained as Igepal ® CA series of products from Rhodia, and nonylphenoxy poly(ethyleneoxy)ethanol can be obtained as Igepal CO series of products from Rhodia or as Tergitol ® NP from Dow Chemical Company.
- Ethyoxylated fatty acids include polyethyleneglycol monostearate or monolaruate which can be obtained from Henkel under the Nopalcol ® series of products.
- Block polymers of propylene oxide and ethylene oxide can be obtained under the Pluronic ® series of products from BASF.
- Polyglycerol esters can be obtained from Stepan under the Drewpol ® series of products.
- Polysaccharide esters can be obtained from Henkel under the Glucopon ® series of products, which are alkyl polyglucosides. Sorbitan esters can be obtained from ICI under the Tween ® series of products.
- compatibilizers can be synthesized in situ in the cellulose ester composition or the cellulose ester/elastomer composition by reacting cellulose ester- compatible compounds with elastomer-compatible compounds. These compounds can be, for example, telechelic oligomers, which are defined as prepolymers capable of entering into further polymerization or other reaction through their reactive end groups. In one embodiment of the invention, these in situ compatibilizers can have higher molecular weight from about 10,000 to about 1 ,000,000.
- the compatibilizer can be reactive.
- the reactive compatibilizer comprises a polymer or oligomer compatible with one component of the composition and functionality capable of reacting with another component of the composition.
- the first reactive compatibilizer has a hydrocarbon chain that is compatible with a nonpolar elastomer and also has functionality capable of reacting with the cellulose ester.
- Such functional groups include, but are not limited to, carboxylic acids, anhydrides, acid chlorides, epoxides, and isocyanates.
- this type of reactive compatibilizer include, but are not limited to: long chain fatty acids, such as, stearic acid (octadecanoic acid); long chain fatty acid chlorides, such as, stearoyi chloride (octadecanoyl chloride); long chain fatty acid anhydrides, such as, stearic anhydride (octadecanoic anhydride); epoxidized oils and fatty esters; styrene maleic anhydride copolymers; maleic anhydride grafted polypropylene;
- copolymers of maleic anhydride with olefins and/or acrylic esters e.g.
- terpolymers of ethylene, acrylic ester and maleic anhydride and copolymers of glycidyl methacrylate with olefins and/or acrylic esters, e.g. terpolymers of ethylene, acrylic ester, and glycidyl methacrylate.
- Reactive compatibilizers can be obtained as SMA ® 3000 styrene maleic anhydride copolymer from Sartomer/Cray Valley, Eastman G-3015 ® maleic anhydride grafted polypropylene from Eastman Chemical Company, Epolene ® E-43 maleic anhydride grafted polypropylene obtained from
- the second type of reactive compatibilizer has a polar chain that is compatible with the cellulose ester and also has functionality capable of reacting with a nonpolar elastomer.
- these types of reactive compatibilizers include cellulose esters or polyethylene glycols with olefin or thiol functionality.
- Reactive polyethylene glycol compatibilizers with olefin functionality include, but are not limited to, polyethylene glycol allyl ether and polyethylene glycol acrylate.
- An example of a reactive polyethylene glycol compatibilizer with thiol functionality includes polyethylene glycol thiol.
- An example of a reactive cellulose ester compatibilizer includes mercaptoacetate cellulose ester.
- the amount of compatibilizer in the cellulose ester composition can range from about 1 wt% to about 40 wt% or from about 5 wt% to about 20 wt% based on the weight of the cellulose ester.
- a cellulose ester/elastomer composition comprising at least one elastomer, at least one cellulose ester, and at least one additive; wherein the additive is at least one selected from the group consisting of at least one plasticizer and at least one compatibilizer.
- the cellulose esters, plasticizers, and compatibilizers have been previously described in this disclosure.
- the elastomer in this invention is at least one non-polar elastomer known in the art. In one embodiment, the non-polar elastomer is primarily based on hydrocarbon.
- non- polar elastomers include, but are not limited to, natural rubber, polybutadiene, polyisoprene, styrene-butadiene rubber, polyolefins, ethylene propylene diene monomer (EPDM), and polynorbornene.
- polyolefins include, but are not limited to, polybutylene, polyisobutylene, and ethylene propylene rubber.
- the amount of cellulose ester in the cellulose ester/elastomer composition ranges from about 1 to about 50 parts per hundred rubber (phr) based on the elastomer. Other ranges are from about 5 to about 30 phr and about 3 to about 30 phr based on the weight of the elastomer.
- the amount of compatibilizer can range from about 1 % to about 40% by weight based on the weight of the cellulose ester. Another range is from about 5 to about 20% by weight based on the weight of the cellulose ester.
- the amount of plasticizer can range from about 1 % to about 50% by weight based on the weight of the cellulose ester. Another range is from about 5% to about 35% by weight based on the weight of the cellulose ester.
- the cellulose ester/elastomer compositions further comprise at least one crosslinking/curing agent.
- Crosslinking/curing agents can be any that is known in the art. Examples of crosslinking/curing agents include, but are not limited to, organic peroxides and sulfur.
- a process for producing a cellulose ester composition comprises contacting at least one cellulose ester, at least one compatibilizer, and optionally, at least one plasticizer.
- the cellulose ester, plasticizer, and compatibilizer were previously discussed in this disclosure.
- the cellulose ester, compatibilizer, and optional plasticizer can be mixed in any order of addition.
- a process for producing a cellulose ester/elastomer composition comprising: a) mixing at least one elastomer, at least one cellulose ester, and at least one additive for a sufficient time and temperature to disperse the cellulose ester to produce the cellulose ester/elastomer composition; wherein the additive is at least one selected from the group consisting of a compatibilizer and a plasticizer.
- a sufficient temperature is defined as the flow temperature of the cellulose ester which is generally about 50 C above the Tg of the cellulose ester.
- the temperature at mixing is limited at the upper range by the processing temperature of the elastomer and at the lower range by the highest use temperature of the cellulose ester/elastomer composition.
- viscoelastic materials can depend on the ratio of the viscosities of the viscoelastic materials. For a given mixing equipment and shear rate range, the viscosity ratio of the dispersed phase (cellulose ester and additive) and continuous phase (elastomer) should be within specified limits for obtaining adequate particle size. In one embodiment of the invention where low shear rotational shearing equipment is utilized, such as, Banbury and
- the viscosity ratio of the dispersed phase (cellulose ester and additive) to the continuous phase (elastomer) can range from about 0.001 to about 5, from about 0.01 to about 5, and from about 0.1 to about 3.
- the viscosity ratio of the dispersed phase (cellulose ester and additive) to the continuous phase (elastomer) can range from about 0.001 to about 500 and from about 0.01 to about 100. It is also known in the art that when mixing two or more viscoelastic materials, the difference between the interfacial energy of the two viscoelastic materials can affect the efficiency of mixing.
- the surface tension difference between the dispersed phase (cellulose ester and additive) and continuous phase (elastomer) is less than about 100 dynes/cm, less than 50 dynes/cm, or less than 20 dynes/cm.
- the cellulose ester is softened and/or melted to allow breakdown of the cellulose ester into sufficiently small particle size under the specified mixing conditions.
- the particle size of the cellulose ester can be between 50 microns to 50 nanometers.
- the elastomer, at least one cellulose ester, and at least one additive are contacted at a temperature in the range of about 70 ° C to about 220 or from about 100 ° C to about 180 C, or from about 130 ° C to about 160C
- mixing equipment include, but are not limited to, Banbury mixers, Brabender mixers, and extruders (single or twin screw). The shear energy during the mixing is dependent on the combination of
- the shear energy should be sufficient for breaking down softened/melted cellulose ester to a small enough size to disperse the cellulose ester throughout the elastomer.
- the shear energy and time of mixing ranges from about 5 to about 15 minutes at 100 rpms.
- the elastomer, cellulose ester and additive can be combined in any order during the process.
- the cellulose ester is premixed with the compatibilizer and/or the plasticizer.
- the cellulose ester containing the compatibilizer and/or the plasticizer is then mixed with the elastomer.
- the reactive compatibilizers when reactive compatibilizers are utilized, can be mixed with either the cellulose ester or the elastomer first, then the other components are added.
- a process to produce a cellulose ester/elastomer compositions comprising: a) mixing at least one elastomer, at least one cellulose ester and at least one additive for a sufficient time and temperature to disperse the cellulose ester throughout said elastomer to produce a cellulose ester/elastomer masterbatch; wherein the additive is at least one selected from the group consisting of a compatibilizer and a plasticizer; and b) mixing the masterbatch and at least one elastomer to produce the cellulose ester/elastomer composition.
- the elastomer in the masterbatch can be the same or different than that utilized to produce the cellulose ester/elastomer composition.
- the processes of mixing have been previously discussed in this disclosure.
- Example 1 Non-Reactive Compatibilizer in Cellulose Ester/Elastomer Compositions
- Tergitol 15-S-9 and Tergitol 15-S-30 are secondary alcohol ethoxylates obtained from Dow Chemical in Midland, Ml.
- the polyethylene block polyethylene glycol compatibilizers were obtained from Sigma-Aldrich.
- Reference Tg for CAB 551 -0.01 is 107 ° C and for CAB 553-0.4 is 139 ° C
- Table 3 The amounts specified in Table 3 are based on 100 grams of rubber and expressed as parts per hundred rubber (phr). For example, for Composition 1 .3, 100 grams of rubber was utilized as well as 12.5 grams of Masterbatch 1 , which is an 80:20 ratio of cellulose acetate butyrate (CAB 553-0.4) and
- cellulose ester, elastomer, and compatibilizers in Table 3 were processed in a Brabender mixer for 30 minutes at 150 C and 100 rpm to produce the cellulose ester/elastomer composition. Then, 2.5 phr dicumyl peroxide (curing agent) was added to each sample at 50-60 C in a Brabender mixer for about 1 minute and then mixed for another 2-3 minutes to produce a partially cured cellulose ester/elastomer composition. The samples from the Brabender mixer were cured by compression molding for 45 minutes at 150 C and 20000 psi.
- the modulus, yield stress, and yield strain of the compression molded, cured cellulose ester/elastomer composition samples were measured as per ASTM D412 and are shown in Table 4.
- ASTM D412 method samples were prepared by cutting the specimens with Die C. The speed of testing was 20 inches/min, and the gauge length was 63.5 mm (2.5 inch). The samples were conditioned in the laboratory for 40 hours at 50% +/- 5% humidity and 72 ° F. The width of the specimen was 1 inch and the length was 4.5 inches.
- compositions 1.3-1.7 the addition of the compatibilizer to the elastomer and cellulose ester showed an improvement in modulus, yield stress, and yield strain over the Comparative Compositions 1.1 and 1.2 containing either rubber alone or rubber and cellulose ester alone.
- Compositions 1.9-1.13 the Yield Strain and Yield Stress were improved over the Comparative Composition 1.8.
- Reactive compatibilizers were evaluated to improve the mixing of CAB in styrene butadiene rubber (SBR).
- SBR styrene butadiene rubber
- the reactive compatibilizers were selected such that they contained reactive groups that can react with the CAB and the rest of the molecule is compatible with the SBR.
- the molecular weight, and the type and concentration of the reactive moiety were varied. Table 5
- the maleic anhydride and glycidyl methacrylate in these reactive compatibilizers can react with the hydroxyl group contained in the cellulose ester.
- Masterbatches of Duradene 761 styrene butadiene rubber and a reactive compatibilizer were produced as shown in Table 6.
- Duradene 761 styrene butadiene rubber and the reactive compatibilizer were mixed in a Brabender mixer at 100 rpm and 160 C for 30 minutes to produce the masterbatches (MB1 -MB6).
- composition No. Duradene 761 Compatibilizer Compatibilizer gm quantity, gm
- compositions produced are shown in Table 7.
- Composition Number 2.1 contained only SBR.
- Composition Number 2.2 contained only SBR and CAB 551 -.01 .
- Composition Numbers 2.3-2.8 the masterbatches produced containing SBR and compatibilizer were mixed with cellulose ester in a Brabender mixer at 100 rpm for 30 minutes at 150 ° C.
- a CAB/plasticizer masterbatch was prepared by blending 100 g CAB 553-0.4 and 10 g Eastman 168 plasticizer (bis(2-ethyl hexyl)- 1 ,4- benzenedicarboxylate) obtained from Eastman Chemical Company using a Brabender mixer at 100 rpm and 150 ° C for 10 minutes.
- the CAB/plasticizer masterbatch was cryo-ground to a powder.
- Eastman 168 plasticizer was added to reduce the Tg/Tm of the CAB 553-0.4 so that it melted at a processing temperature of about 150 C.
- the Tg of the CAB/plasticizer masterbatch was obtained by preparing samples dissolved in acetone followed by vacuum drying at 70 C and analyzing the samples by Differential Scanning Calorimetry (DSC) (2nd cycle). Only CAB 553-0.4 was utilized in the masterbatches. CAB 551 -0.01 was mixed with Eastman 168 plasticizer to determine the Tg.
- the glass transition temperatures (Tg) of the cellulose ester/plasticizer compositions produced are shown in Table 8.
- composition Numbers 2.1 -2.15 were prepared by weighing each component in Table 6 separately and processing the components in a Brabender mixed at 100 rpm for 30 minutes at 150 ° C.
- 1 g of dicumyl peroxide i.e. 2.5 phr
- the curing of the cellulose ester/elastomer composition was then completed by compression molding for 45 minutes at 150 ° C and 20000 psi.
- SBR styrene butadiene rubber
- the SBR and the masterbatch were mixed in a Brabender mixer for 30 minutes at 1 50 ° C and 100 rpm.
- 2.5 phr dicumyl peroxide (curing agent) were added to each sample at 50-60 C in the Brabender mixer in 1 minute and then mixed for another 2-3 minutes.
- the samples from the Brabender mixer were compression molded for 45 minutes at 1 50 C and 20000 psi. The formulation of these samples are shown in Table 1 1 .
- Each cellulose ester containing masterbatch sample has 10 phr (parts per hundred rubber) cellulose ester.
- the modulus, yield stress and yield strain of the compression molded, cured, elastomer/cellulose ester composition samples were measured as per ASTM D412 and are shown in Table 12.
- Table 13 shows the tire formulations. All amounts in Table 13 are based on parts per hundred rubber (phr).
- Table 14 shows the cellulose ester/plasticizer masterbatch formulations.
- Table 15 shows the mixing conditions.
- the components were mixed in a Banbury mixer, which was a Farrel BR mixer with steam heating and water cooling which is instrumented with computer monitors for temperature, rpm, and power.
- the composition was cured T 90 + 5 minutes at 320°F (160°C).
- Si69 is a sulfur-containing organosilane obtained from Arkema
- Sundex ® 790 is an aromatic oil obtained from Sunoco
- Okerin wax 7240 is a microcrystalline wax obtained from Sovereign Chemical
- Santoflex 6PPD is an anti-oxidant obtained from Flexsys.
- KK49 is a processing aid obtained from Strutkol.
- 0Santocure CBS is an accelerator obtained from Flexsys.
- Perkacit DPG-grs is an accelerator obtained from Flexsys. Table 14 - Compositions of Plasticized Cellulose Ester Masterbatches
- CAB 381-2 CAB 381 -2 CAB 381-2
- Mooney Viscosity The Mooney Viscosities were measured according to ASTM D 1646.
- PHILLIPS Dispersion Rating The samples were cut with a razor blade, and pictures were taken at 30X magnification with an Olympus SZ60 Zoom Stereo Microscope interfaced with a PaxCam ARC digital camera and a Hewlett Packard 4600 LaserJet color printer. The pictures of the samples were then compared to a Phillips standard dispersion-rating chart having standards ranging from 1 (bad) to 10 (excellent).
- Shore A hardness was measured according to ASTM D2240.
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BR112012033278A BR112012033278A2 (en) | 2010-06-29 | 2011-06-29 | cellulose ester / elastomer compositions, article, and process for producing a cellulose ester / elastomer composition |
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Also Published As
Publication number | Publication date |
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EP2588518A4 (en) | 2013-11-27 |
US20110319530A1 (en) | 2011-12-29 |
US9068063B2 (en) | 2015-06-30 |
US9200147B2 (en) | 2015-12-01 |
BR112012033278A2 (en) | 2016-11-22 |
EP2588518A1 (en) | 2013-05-08 |
MX2012014819A (en) | 2013-01-29 |
CN102958989A (en) | 2013-03-06 |
US20110319531A1 (en) | 2011-12-29 |
US20110319529A1 (en) | 2011-12-29 |
CA2803359A1 (en) | 2012-01-12 |
KR101875976B1 (en) | 2018-07-06 |
US20110319532A1 (en) | 2011-12-29 |
MX357225B (en) | 2018-06-29 |
JP2013529725A (en) | 2013-07-22 |
JP5922653B2 (en) | 2016-05-24 |
KR20130088840A (en) | 2013-08-08 |
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