Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
• • 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
  • C08F220/00—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 a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
• • 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
  • C08F220/00—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 a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
• • 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
  • C08F220/00—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 a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
• • 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
  • C08F220/00—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 a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/52—Amides or imides
  • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
  • C08F220/60—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing nitrogen in addition to the carbonamido nitrogen
• • 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
  • C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
  • C08F226/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a single or double bond to nitrogen
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/14—Carboxylic acids; Derivatives thereof
  • D21H17/15—Polycarboxylic acids, e.g. maleic acid
  • D21H17/16—Addition products thereof with hydrocarbons
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
  • D21H17/375—Poly(meth)acrylamide
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/16—Sizing or water-repelling agents

Definitions

• the present invention relates to polymers that are useful in paper additives.
• Size refers to a fibrous substrate's ability to resist wetting or penetration of a liquid into a paper sheet.
• Aqueous dispersions of alkenylsuccinic anhydride (ASA) cellulose-reactive sizing agent have been widely used in the paper and board making industry for many years, for sizing a wide variety of grades which include printing and writing grades and bleached and unbleached board grades.
• Cellulose-reactive alkenylsuccinic anhydride emulsions impart hydrophobic properties to the paper and board products.
• Internal sizes can be either rosin-based or synthetic sizes such as alkenylsuccinic anhydride, or other materials. Internal sizes are added to the paper pulp prior to sheet formation. Surface sizes are sizing agents that are added after the paper sheet has formed, most generally at the size press, although spraying applications may also be used.
• a synthetic sizing agent such as alkenylsuccinic anhydride sizing agent is ordinarily applied by dispersing it in a cationic or amphoteric hydrophilic substance such as a starch or a polymer.
• the starch or polymer-dispersed alkenylsuccinic anhydride sizing emulsions have been added to the pulp slurry before the formation of a paper web.
• This type of addition of alkenylsuccinic anhydride sizing emulsions to the paper making system is commonly called wet-end addition or internal addition of alkenylsuccinic anhydride.
• Papermakers would benefit from a cationic or amphoteric polymer that is different from known polymers and, preferably, that also enhances the sizing efficiency of paper products.
• compositions have prevented papermakers from achieving this goal.
• Known compositions and methods require an unduly large amount of materials to size paper products. Papermakers are under pressure to improve sizing efficiency and, as such, there is an ongoing need to develop products and methods that improve sizing efficiency.
• the invention relates to a cationic polymer useful as a papermaking additive, which is obtained by copolymerizing:
• R 1 is a hydrogen atom or a methyl group
• A is an oxygen atom or NH group
• n is 2 or 3
• R 2 and R 3 are each a methyl group or an ethyl group and X is a chlorine atom, a bromine atom, or X ⁇ is a methyl sulfate ion;
• R 4 is a hydrogen atom or a methyl group
• R 5 and R 6 is a hydrogen atom or a methyl group, n is 1-4, inclusive and m is 1 or 2.
• the invention relates to an amphoteric polymer useful as a papermaking additive, which is obtained by copolymerizing
• R 1 is a hydrogen atom or a methyl group
• A is an oxygen atom or NH group
• n is 2 or 3
• R 2 and R 3 are each a methyl group or an ethyl group and X is a chlorine atom, a bromine atom, or X is a methyl sulfate ion;
• R 4 is a hydrogen atom or a methyl group
• R 5 and R 6 is a hydrogen atom or a methyl group and n is 1 or 4 and m is 1 or 2 ;
• R 7 is a hydrogen atom or a methyl group
• R 8 is a hydrogen atom, an alkali metal, ammonium group.
• the invention relates to a method for making the cationic polymer or a method for making the amphoteric polymer.
• the invention in another embodiment, relates to a method comprising (a) providing paper stock; (b) adding to the paper stock a composition comprising:(i) synthetic sizing agent, and (ii) the above described cationic polymer or amphoteric polymer, and (c) forming a web from said paper stock, such that the web exhibits an improved sizing efficiency as compared to a web made without the cationic polymer.
• the invention is based on the remarkable discovery that by using a certain cationic polymer or amphoteric polymer, it is now possible to enhance the sizing efficiency of a paper product.
• paper is meant to include fibrous substrates that include not only paper as the term is commonly used but all types of cellulose-based products in sheet and web form, including, for example, board and paperboard.
• the sizing compositions may be added to any stock containing cellulosic fibres, optionally in combination with mineral fillers, and usually the content of cellulosic fibres is at least 50% by weight, based on dry stock.
• mineral fillers of conventional types include kaolin, china clay, titanium dioxide, gypsum, talc and natural and synthetic calcium carbonates such as chalk, ground marble and precipitated calcium carbonate.
• a cationic polymer of the invention is obtained by copolymerizing
• R 1 is a hydrogen atom or a methyl group
• A is an oxygen atom or NH group
• n is 2 or 3
• R 2 and R 3 are each a methyl group or an ethyl group and X is a chlorine atom, a bromine atom, or X ⁇ is a methyl sulfate ion;
• R 4 is a hydrogen atom or a methyl group
• R 5 and R 6 is a hydrogen atom or a methyl group, n is 1-4, inclusive and m is 1 or 2.
• the synthetic sizing agent may be any sizing agent that can imparts desired sizing properties.
• Preferred sizing agents include alkenyl succinic anhydride (ASA) and alkyl ketene dimer (AKD), and alkeno ketene dimer, alkyl isocyanates, and alkyl anhydrides.
• the vinyl monomer (I) may be a quaternary ammonium group-containing vinyl monomer produced by quaternizing a dialkylaminoalkyl ester of acrylic acid or methacrylic acid with an alkyl halide or alkyl sulfate.
• Specific examples of the vinyl monomer (I) include quaternized products resulting from dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, etc.
• the quaternizing agent there may be exemplified methyl chloride, methyl bromide, methyl iodide, ethyl bromide, etc.
• the vinyl monomer (Ia) may include diallyidimethylammonium chloride.
• the vinyl monomer (II) includes acrylamide and methacrylamide. These monomers are effective in increasing the molecular weight of the resulting polymer due to its high polymerizability. They are also effective in improving the water solubility of the produced polymer.
• the vinyl monomer (III) may include hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, hydroxyprolyl (meth)acrylate and hydroxybutyl (meth)acrylate.
• the vinyl monomer (IIIa) may include 2,3-dihydroxypropyl (meth)acrylate and 3,4-dihydroxybutyl (meth)acrylate.
• the cationic charge of the cationic polymer ranges from at least 1 to 99 mole %.
• the cationic polymer has a 2-hydroxyethyl methacrylate ranging from 1 to 30 mole percent. In another embodiment, the cationic polymer has a 2-hydroxyethyl methacrylate ranging from 2 to 20 mole percent. In another embodiment, the cationic polymer has a 2-hydroxyethyl methacrylate ranging from 5 to 10 mole percent.
• the cationic polymer can be crosslinked or branched.
• amphoteric polymer of the invention is generally obtained by copolymerizing:
• R 1 is a hydrogen atom or a methyl group
• A is an oxygen atom or NH group
• n is 2 or 3
• R 2 and R 3 are each a methyl group or an ethyl group and X is a chlorine atom, a bromine atom, or X is a methyl sulfate ion;
• R 4 is a hydrogen atom or a methyl group
• R 5 and R 6 is a hydrogen atom or a methyl group and n is 1 or4 and m is 1 or2;
• R 7 is a hydrogen atom or a methyl group
• R 8 is a hydrogen atom, an alkali metal, ammonium group.
• the anionic vinyl monomer (IV) may include acrylic acid or methacrylic acid.
• the amphoteric polymer preferably has an anionic charge ranging from 0 to 40 mole percent.
• the molecular weight of the cationic polymer or amphoteric polymer varies, depending on the needs at hand.
• the cationic polymer or amphoteric polymer has a molecular weight ranging from 10,000 to 3,000,000 daltons average molecular weight.
• the cationic polymer or amphoteric polymer has a molecular weight ranging from 100,000 to 2,000,000 daltons average molecular weight.
• the cationic polymer or amphoteric polymer has a molecular weight ranging from 100,000 to 1,000,000 daltons average molecular weight. Molecular weights stated herein are weight average.
• the proportion of the vinyl monomers to be copolymerized may be varied depending on the desired properties of the resulting polymer, the kinds of monomers used, the polymerization mode to be adopted, etc. But, the molar proportion of the vinyl monomers (I), (II), (III) and (IV) is usually about 1 to 99:1 to 99:1 to 30:0 to 40, or about 1 to 10:1 to 85:2 to 10:0 to 5
• the copolymerization of the vinyl monomers may be carried out in an aqueous medium in the presence of a catalyst by a per se conventional procedure such as solution polymerization, emulsion polymerization or precipitation polymerization.
• the reaction medium water, a lower alcohol or their mixture, among which the use of water is particularly preferred.
• the total concentration of the vinyl monomers in the aqueous medium may be from about 5 to 80% by weight.
• the polymer is produced in a form ranging from a fluidizable liquid to a non-fluidizable solid.
• the product When the product is a liquid, it may be used as such.
• the product When the product is a solid, it may be crushed, if necessary, followed by drying to give a powdery material.
• the invention provides valuable methods.
• the invention relates to a method that includes the steps of (a) providing paper stock; (b) adding to the paper stock a composition comprising:(i) synthetic sizing agent, and (ii) a cationic polymer useful as a paper additive obtained by copolymerizing:
• R 1 is a hydrogen atom or a methyl group
• A is an oxygen atom or NH group
• n is 2 or 3
• R 2 and R 3 are each a methyl group or an ethyl group and X is a chlorine atom, a bromine atom, or X ⁇ is a methyl sulfate ion;
• R4 is a hydrogen atom or a methyl group
• R 5 and R 6 is a hydrogen atom or a methyl group and n is 1-4, inclusive and m is 1 or 2.(iii) water or starch solution, and
• the invention provides a method that includes the steps of (a) providing paper stock; (b) adding to the paper stock a composition comprising: (i) a synthetic sizing agent, and (ii) the amphoteric polymer useful as a paper additive, which is obtained by copolymerizing
• R 1 is a hydrogen atom or a methyl group
• A is an oxygen atom or NH group
• n is 2 or 3
• R 2 and R 3 are each a methyl group or an ethyl group and X is a chlorine atom, a bromine atom, or X is a methyl sulfate ion;
• R 4 is a hydrogen atom or a methyl group
• R 5 and R 6 is a hydrogen atom or a methyl group and n is 1 or 4 and m is 1 or 2.
• R 7 is a hydrogen atom or a methyl group
• R 8 is a hydrogen atom, an alkali metal, ammonium group
• the invention provides a method that involves the steps of (a) providing paper stock; (b) forming a web from said paper stock, (c) adding to the web a composition cationic polymer or the amphoteric polymer.
• a polymer is added to the surface of a fibrous subtrate by any suitable means, e.g., by size press application, spraying and/or water box application.
• anionic or non-ionic polymers may also be used.
• non-ionic polymers are obtained by copolymerizing vinyl monomers of formulae (II) and (III) and/or (IIIa).
• Anionic polymers can obtained by copolymerizing monomers of formula (II), and (III), and/or (IIIa), and (IV).
• the synthetic sizing agent can be applied in various amounts.
• the synthetic sizing agent is generally applied at a dosage ranging from 0.1 kg/metric ton to 10 kg/metric ton, or 0.5 to 5, or from 1 to 4.
• the synthetic sizing agent:polymer is added to the paper stock at weight ratios that enable the resulting web to exhibit an improved sizing efficiency as compared to a web made without the cationic polymer.
• the synthetic sizing agent :polymer is added at a weight ratio ranging from 1:0.05 to 1:1.
• the synthetic sizing agent :polymer is added at a weight ratio ranging from 1:0.1 to 1:0.5.
• the synthetic sizing agent:polymer is added at a weight ratio ranging from 1:0.1 to 1:0.2.
• the synthetic sizing agent can also be added in various forms.
• the synthetic sizing agent is emulsified with a polymer.
• the sizing agent is emulsified with water and surfactants.
• the sizing agent is emulsified in starch.
• the synthetic sizing agent is added as a sizing emulsion containing a surfactant and the emulsion is prepared under low shear conditions, e.g. those shearing conditions are created by a device selected from the group of centrifugal pumps, static in-line mixers, peristaltic pumps, magnetic stirring bar in a beaker, overhead stirrer, and combinations thereof.
• the synthetic sizing agent is added as a sizing emulsion containing surfactant and the emulsion is prepared under high shear conditions.
• Suitable surfactants include but are not limited to alkyl and aryl primary, secondary and tertiary amines and their corresponding quaternary salts, sulfosuccinates, fatty acids, ethoxylated fatty acids, fatty alcohols, ethoxylated fatty alcohols, fatty esters, ethoxylated fatty esters, ethoxylated triglycerides, sulfonated amides, sulfonated amines, ethoxylated polymers, propoxylated polymers or ethoxylated/ propoxylated copolymers, polyethylene glycols, phosphate esters, phosphonated fatty acid ethoxylates, phosphonated fatty alcohol ethoxylates, and alkyl and aryl sulfonates and sulfates.
• surfactants include but are not limited to amides; ethoxylated polymers, propoxylated polymers or ethoxylated/propoxylated copolymers; fatty alcohols, ethoxylated fatty alcohols, fatty esters, carboxylated alcohol or alkylphenol ethoxylates; carboxylic acids; fatty acids; diphenyl sulfonate derivatives; ethoxylated alcohols; ethoxylated fatty alcohols; ethoxylated alkylphenols; ethoxylated amines; ethoxylated amides; ethoxylated aryl phenols; ethoxylated fatty acids; ethoxylated triglycerides; ethoxylated fatty esters; ethoxylated glycol esters; polyethylene glycols; fatty acid esters; glycerol esters; glycol esters; certain lanolin-based derivatives; monog
• the surfactant component includes an amine selected from the group consisting of trialkyl amine of the formula (I):
• the surfactant excludes this amine.
• the surfactant levels can range from about 0.1 weight % up to about 20 weight % based on the alkenylsuccinic anhydride component.
• the order in which the synthetic sizing agent is added can vary.
• the synthetic sizing agent is added in conjunction with the cationic polymer.
• the sizing efficiency improvement provided by the method can be determined by various methods.
• the sizing efficiency: resistance of water to paper increase measurements can be determined by the ink penetration test or the Cobb test.
• the sizing efficiency improvement can range from 10 to 200 percent more, as compared to when the paper is prepared without the polymer.
• the paper made with a method of the invention has favorable qualities.
• the paper has a ink penetration ranging from 50 to 1500 seconds.
• the paper has a cobb value ranging from 15 to 200 grams/m 2
• a low molecular weight 90/10 mole % acrylamide/[2-(methyl-acryloyloxy ) ethyl]trimethylammonium chloride copolymer was prepared by a free radical co-polymerization.
• the polymerization process was carried out by simultaneous, continuous addition of ammonium persulfate and monomer solutions to a reaction vessel that contained deionized water and chelating agent buffered with malic acid.
• the monomer solution was prepared by mixing 45.62 parts of 52.96% acrylamide solution, 10.45 parts of 75% Q6 solution, 2.4 parts of 2% sodium hypophosphite solution, and 53.93 parts of deionized water.
• the pH of the monomer solution was adjusted from 4.14 to 3.78 with a 20% solution of malic acid.
• the monomer solution was sparged with nitrogen for an hour before addition.
• the reactor vessel solution was prepared by addition of 278.46 parts of deionized water and 0.27 parts of 40% pentasodium diethylenepentaacetate.
• the pH of the reactor vessel solution was adjusted from 10.63 to 3.76 with 0.57 parts of 20% malic acid solution. The latter solution was sparged with nitrogen for an hour.
• the initiator solution was prepared by addition of 0.38 parts of ammonium persulfate into 7.87 parts of deionized water. This solution was sparged with nitrogen for half an hour just prior to use. The addition of monomer solution and ammonium persulfate solution to the reactor vessel 5 was carried out over 2.25 hr and 2.5 hr, respectively. The polymerization reaction was performed at 65° C. The reaction solution was maintained under the nitrogen purge throughout the course of reaction.
• the pH of the final product was equal to 3.1, bulk viscosity was equal to 90 cP (measured using Brookfield viscometer model DV-III, # 3 spindle, 12 rpm, at 25° C.) and viscosity of a 2% polymer solution was equal to 12 cP (measured using Brookfield viscometer model DV-III, # 2 spindle, 30 rpm, at 25° C.).
• Molecular weight of this polymer (Mw) is equal to 227,000 daltons.
• a low molecular weight 90/10/5 mole % acrylamide/[2-(methylacryloyloxy)ethyl]trimethylammonium chloride/2-hydroxyethy methacrylate (AMD/Q6/HEMA) terpolymer was prepared by a free radical co-polymerization.
• the polymerization process was carried out by simultaneous, continuous addition of ammonium persulfate and monomer solutions to a reaction vessel that contained deionized water and chelating agent buffered with malic acid.
• the monomer solution was prepared by mixing 41.64 parts of 52.96% acrylamide solution, 10.11 parts of 75% Q6 solution, 2.44 parts of 97% HEMA solution, 2.4 parts of 2% sodium hypophosphite solution, and 55.86 parts of deionized water. The pH of this solution was equal to 3.82. The monomer solution was sparged with nitrogen for an hour before addition.
• the reactor vessel solution was prepared by mixing 278.27 parts of deionized water and 0.27 parts of 40% pentasodium diethylenepentaacetate. The pH of the reactor vessel solution was adjusted from 10.47 to 3.63 with 0.76 parts of 20% malic acid solution. The latter solution was sparged with nitrogen for an hour just prior to use.
• the initiator solution was prepared by addition of 0.38 parts of ammonium persulfate into 7.87 parts of deionized water. This solution was sparged with nitrogen for half an hour prior to use. The addition of monomer solution and ammonium persulfate solution to the reactor vessel was carried out over 2.25 hr and 2.5 hr, respectively. The polymerization reaction was performed at 65° C. The reaction solution was maintained under the nitrogen purge throughout the course of reaction.
• the pH of final product was equal to 3.1, bulk viscosity was equal to 70 cP (measured using Brookfield viscometer model DV-III, # 3 spindle, 12 rpm, at 25° C.) and viscosity of a 2% polymer solution was equal to 11 cP (measured using Brookfield viscometer model DV-III, # 2 spindle, 30 rpm, at 25° C.). Molecular weight of this polymer (Mw) is equal to 257,000 daltons.
• ASA Alkenyl succinic anhydride
• Handsheets were prepared using a furnish of a 50/50 mixture of bleached hardwood and softwood kraft pulp refined to a Canadian Standard Freeness of 500 to which 15% by weight of precipitated calcium carbonate was added, and pH was adjusted to 7.8.
• Deionized water was used for furnish preparation, and additional 80 ppm of sodium sulfate and 50 ppm of calcium chloride were added.
• the BIP size testing method provides a fully automated application of ink to the under surface of the paper together with automatic measurement of the optical end point.
• This method uses the same principle as the TAPPI T 530 test but uses an instrument of our design, which provides an automated design and different geometry for light sources and detector. In particular, all steps of the BIP test were performed automatically with this apparatus.
• On the push of a start button ink was pumped into a well until the ink contacted the under surface of the paper, determined electronically, and the timing of the ink penetration was obtained from a reflectance measurement and was displayed digitally.
• Neutral ink buffered to pH 7. 0 was used in all BIP testing and was prepared by dissolving 12. 5 g of naphthol green B dye in 500 mL of deionized water, and a pH 7 buffer solution was then added to bring the total volume to1000 mL at 23° C.
• Handsheets were evaluated by the BIP test after a conditioning period of at least one day at 72 F and 50% relative humidity. Three handsheet specimens were tested, with two repetitions on each felt side, for a total of six tests.
• each paper specimen was inserted into the apparatus.
• a fiber optic source cable provided uniform illumination of the topside of the specimen.
• a detector fiber optic cable viewed the same area of illumination.
• the initial reflectance of the specimen was determined automatically and stored for reference.
• the test ink was automatically metered by a metering pump from a reservoir into the bottom of a cone-shaped ink well until the ink contacted the underside of the paper specimen under test, at which time a timer was started electronically.
• the change in reflectance was periodically monitored automatically and the timer was stopped when a pre-specified percentage decrease in reflectance was reached. This decrease was about 20%, i. e., the specimen retained about 80% of its initial reflectance.
• the elapsed time of the test was displayed and recorded to the nearest second.
• a drain pump was started automatically and run for a period of time long enough to empty the ink in the well into a waste reservoir.
• the average test time for the three specimens on the felt side were calculated.
• ASA emulsion prepared with a polymer from Example 2 has smaller median particle size and narrower particle size distribution.
• ASA emulsion prepared with polymer from Example 2 provides higher sizing than ASA emulsion prepared with a polymer from Example 1.
• a low molecular weight 90/10/5/4 mole % acrylamide/[2-(methylacryloyloxy)ethyl]trimethylammonium chloride/2-hydroxyethy methacrylate/acrylic acid (AMD/Q6/HEMA/AA) tetrapolymer was prepared by a free radical co-polymerization.
• the polymerization process was carried out by simultaneous, continuous addition of ammonium persulfate and monomer solutions to a reaction vessel that contained deionized water and chelating agent buffered with malic acid.
• the monomer solution was prepared by mixing 99.13 parts of 52.96% acrylamide solution, 25.28 parts of 75% Q6 solution, 6.11 parts of 97% HEMA solution, 2.66 parts of 99% acrylic acid solution, 5.0 parts of 4% sodium hypophosphite solution, and 10.32 parts of deionized water.
• the pH of this solution was equal to 2.12.
• the monomer solution was sparged with nitrogen for an hour before addition.
• the reactor vessel solution was prepared by mixing 242.7 parts of deionized water and 0.27 parts of 40% pentasodium diethylenepentaacetate.
• the pH of the reactor vessel solution was adjusted from 10.69 to 4.53 with 0.28 parts of 20% malic acid solution. The latter solution was sparged with nitrogen for an hour prior to use.
• the initiator solution was prepared by addition of 0.96 parts of ammonium persulfate into 7.28 parts of deionized water. This solution was sparged with nitrogen for half an hour prior to use. The addition of monomer solution and ammonium persulfate solution to the reactor vessel was carried out over 2.25 hr and 2.5 hr, respectively. The polymerization reaction was performed at 65° C. The reaction solution was maintained under the nitrogen purge throughout the course of reaction.
• the pH of final product was equal to 2.03, bulk viscosity was equal to 2310 cP (measured using Brookfield viscometer model DV-III, # 3 spindle, 12 rpm, at 25° C.) and viscosity of a 2% polymer solution was equal to 7.0 cP (measured using Brookfield viscometer model DV-III, # 2 spindle, 30 rpm, at 25° C.). Molecular weight of this polymer (Mw) is equal to 212,000 daltons.
• ASA emulsions were prepared with polymers from Examples 1, 2 and 4 at a 1/0.2 ASA/polymer ratio. Concentration of ASA during the emulsification was equal to 3.85 wt. %. ASA emulsions were prepared by the procedure described in Example 3 except that 0.8% polymer solution was used for emulsification. Handsheets were made and tested as it was described in Example 3.
• Table 3 it is shown that ASA emulsions prepared with a polymer from Example 2 and 4 have smaller median particle size and narrower particle size distribution than ASA emulsion prepared with a polymer from Example 1.
• Table 4 shows that ASA emulsified with polymers from Example 2 and 4 provides higher sizing than ASA emulsified with a polymer from Example 1.
• ASA emulsion is prepared with a polymer from Example 4 at an ASA/polymer ratio of 1/0.2 and 1/1. These emulsions were compared to ASA emulsions prepared with conventional cationic starch at ASA/starch ratios of 1/0.2 and 1/1.
• Emulsions were prepared as described in Example 3, except that a 0.8 wt. % polymer or starch solution was used to make an emulsion at 1/0.2 ASA/emulsifier ratio, and a 4 wt % solution of polymer or starch was used to make an emulsion at 1/1 ASA/emulsifier ratio. Stability of emulsions was checked after 2 hrs.
• ASA emulsion prepared with polymer from Example 4 has small median particle, narrow particle size distribution and is stable for at least two hours. This emulsion provides sizing of paper.
• ASA emulsion At the ratio of 1/0.2 ASA/starch, ASA emulsion has large median particle size, bimodal distribution and separates within 30 min. This emulsion doesn't provide sizing.
• ASA emulsions prepared with polymer and with starch have small median particle size and narrow particle size distribution, however ASA/starch emulsion is not useable after 2 hour, while ASA/polymer emulsion is not changed for at least two hours.
• ASA emulsion prepared with starch outperforms emulsion prepared with polymer.
• a high molecular weight 90/10 mole % acrylamide/ [2-(methylacryloyloxy)ethyl]trimethylammonium chloride copolymer was prepared by a free radical co-polymerization.
• the polymerization process was carried out by simultaneous, continuous addition of ammonium persulfate and monomer solutions to a reaction vessel that contained deionized water and chelating agent buffered with malic acid.
• the monomer solution was prepared by mixing 45.62 parts of 52.96% acrylamide solution, 10.45 parts of 75% Q6 solution, and 56.30 parts of deionized water.
• the pH of the monomer solution was adjusted from 4.1 to 3.7 with 0.08 parts of 20% solution of malic acid.
• the monomer solution was sparged with nitrogen for an hour prior to addition.
• the reactor vessel solution was prepared by mixing 278.41 parts of deionized water and 0.27 parts of 40% pentasodium diethylenepentaacetate. The pH of the reactor vessel solution was adjusted from 10.8 to 3.8 with 0.62 parts of 20% malic acid solution. The latter solution was sparged with nitrogen for an hour prior to addition.
• the initiator solution was prepared by addition of 0.22 parts of ammonium persulfate into 8.03 parts of deionized water. This solution was sparged with nitrogen for half an hour prior to use. The addition of monomer solution and ammonium persulfate solution to the reactor vessel was carried out over 2.25 hr and 2.5 hr, respectively. The polymerization reaction was performed at 65° C. The reaction solution was maintained under the nitrogen purge throughout the course of reaction.
• the pH of final product was equal to 3.05, bulk viscosity was equal to 2389 cP (measured using Brookfield viscometer model DV-III, # 3 spindle, 12 rpm, at 25° C.) and viscosity of a 2% polymer solution was equal to 62 cP (measured using Brookfield viscometer model DV-III, # 2 spindle, 30 rpm, at 25° C.).
• Molecular weight of this polymer (Mw) is equal to 1,000,000 daltons.
• a high molecular weight 90/10/5 mole % acrylamide/ [2-(methylacryloyloxy) ethyl]trimethylammonium chloride/2-hydroxyethy methacrylate (AMD/Q6/HEMA) terpolymer was prepared by a free radical copolymerization.
• the polymerization process was carried out by simultaneous, continuous addition of ammonium persulfate and monomer solutions to a reaction vessel that contained deionized water and chelating agent buffered with malic acid.
• the monomer solution was prepared by mixing 41.64 parts of 52.96% acrylamide solution, 10.11 parts of 75% Q6 solution, 2.44 parts of 97% HEMA solution, and 58.26 parts of deionized water.
• the pH of this solution was equal to 3.62.
• the monomer solution was sparged with nitrogen for an hour before addition.
• the reactor vessel solution was prepared by mixing 278.30 parts of deionized water and 0.27 parts of 40% pentasodium diethylenepentaacetate.
• the pH of the reactor vessel solution was adjusted from 10.87 to 3.81 with 0.73 parts of 20% malic acid solution. The latter solution was sparged with nitrogen for an hour prior to use.
• the initiator solution was prepared by addition of 0.26 parts of ammonium persulfate into 7.99 parts of deionized water. This solution was sparged with nitrogen for half an hour prior to use. The addition of monomer solution and ammonium persulfate solution to the reactor vessel was carried out over 2.25 hr and 2.5 hr, respectively. The polymerization reaction was performed at 65° C. The reaction solution was maintained under the nitrogen purge throughout the course of reaction.
• the pH of final product was equal to 3.16, bulk viscosity was equal to 1400 cP (measured using Brookfield viscometer model DV-III, # 3 lo spindle, 12 rpm, at 25° C.) and viscosity of a 2% polymer solution was equal to 50 cP (measured using Brookfield viscometer model DV-III, # 2 spindle, 30 rpm, at 25° C.).
• Molecular weight of this polymer (Mw) is equal. to 1,050,000 daltons.
• ASA emulsions were prepared with polymers from Examples 7 and 8 at a 1/0.1 ASA/polymer ratio. Concentration of ASA during the emulsification was equal to 3.85 wt. %. ASA emulsions were prepared, and handsheets were made and tested as it was described in Example 3.
• Example 7 As it is shown in Table 8, sizing obtained with ASA emulsified Example 8 is significantly higher than sizing obtained with ASA emulsified with Example 7.
• a high molecular weight 90/10/5 mole % acrylamide/[2-(methylacryloyloxy)ethyl]trimethylammonium chloride/2,3-dihydroxypropyl methacrylate (AMD/Q6/DHPMA) terpolymer was prepared by a free radical co-polymerization.
• the polymerization process was carried out by simultaneous, continuous addition of ammonium persulfate and monomer solutions to a reaction vessel that contained deionized water and chelating agent buffered with malic acid.
• the monomer solution was prepared by mixing 40.93 parts of 52.96% acrylamide solution, 9.93 parts of 75% Q6 solution, 2.87 parts of 100% DHPMA, and 58.66 parts of deionized water.
• the pH of this solution was adjusted from 4.9 to 4.05 with 0.6 parts of 20 % malic acid solution.
• the monomer solution was sparged with nitrogen for an hour before addition.
• the reactor vessel solution was prepared by mixing 278.65 parts of deionized water and 0.27 parts of 40% pentasodium diethylenepentaacetate.
• the pH of the reactor vessel solution was adjusted from 10.15 to 3.80 with 0.38 parts of 20% malic acid solution. The latter solution was sparged with nitrogen for an hour prior to addition.
• the initiator solution was prepared by addition of 0.26 parts of ammonium persulfate into 7.99 parts of deionized water. This solution was sparged with nitrogen for half an hour prior to use. The addition of monomer solution and ammonium persulfate solution to the reactor vessel was carried out over 2.25 hr and 2.5 hr, respectively. The polymerization reaction was performed at 65° C. The reaction solution was maintained under the nitrogen purge throughout the course of reaction.
• the pH of final product was equal to 3.16
• bulk viscosity was equal to 920 cP (measured using Brookfield viscometer model DV-III, # 3 spindle, 12 rpm, at 25° C.)
• viscosity of a 2% polymer solution was equal to 39 cP (measured using Brookfield viscometer model DV-III, # 2 spindle, 30 rpm, at 25° C.).
• ASA emulsions were prepared with polymers from Examples 7, 8 and 10 at a 1/0.1 ASA/polymer ratio. Concentration of ASA during the emulsification was equal to 7.4 wt. %. ASA emulsions were prepared as it was described in Example 3, except that 7.4 grams of ASA was added to 92.6 g of a 0.8 wt % polymer solution. Handsheets were made and tested as it was described in Example 3.

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