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
  • D21H17/03—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
• • 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
  • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
  • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
  • D21H17/45—Nitrogen-containing groups
  • D21H17/455—Nitrogen-containing groups comprising tertiary amine or being at least partially quaternised

Definitions

• ASA Alkenyl succinic anhydrides
• U.S. patent 3,102,064 discloses a certain class of chemical materials generally having the structural formula wherein R represents a dimethylene or trimethylene radical, and wherein R1 is a hydrophobic group containing more than 5 carbon atoms which may be selected from the group consisting of alkyl, alkenyl, aralkyl or aralkenyl groups.
• the sizing agents must be used in conjunction with a material which is either cationic in nature or is capable of ionizing or disassociating in such a manner to produce one or more cations or other positively charged groups.
• the cationic agents are disclosed as "alum, aluminum chloride, long chain fatty amines, sodium aluminate, polyacrylamide, chromic sulfate, animal glue, cationic thermosetting resins, and polyamide polymers".
• Preferred cationic agents are the various cationic starch derivates including primary, secondary, tertiary, or quaternary amine starch derivates and other cationic nitrogen substituted starch derivates, as well as cationic sulfonium and phosphonium starch derivatives. Such derivatives may be prepared from all types of starches including corn, tapioca and potato.
• a similar paper sizing composition is the subject matter of the EP-A 122 617. This composition contains two different ASA compounds and a dispersing agent which may be selected from the group consisting of cationized starch, gelatine, polyvinyl alcohol, cationic polyacrylamide and polyethyleneimine.
• ASA sizing materials are not water soluble, and must, accordingly, be uniformly suspended in the pulp so that the size can make adequate contact with the cellulosic fibers and thus create the desired effect of the final product.
• sizing agents which comprise 1 - 60 parts by weight of a sizing accelerating agent per 10 parts by weight of a hydrophobic sizing such as ketene dimers.
• Useful accelerators are polymers containing primary, secondary or tertiary amino and/or quaternary ammonium groups directly bonded or present as pendant groups, such as a quaternized terpolymer which contain N,N-dimethylaminoethyl methacrylate, styrene and methyl methacrylate, acrylonitrile or n-butylacrylate units.
• ASA sizings are not exemplified or tested. Although the molecular weight of these polymers is not specificly investigated it seems that the tested sizing accelerators are high molecular weight water-soluble polymers.
• the US patent 36 66 512 discloses an aqueous sizing dispersion consisting of hydrophobic paper-sizing carboxylic acid anhydride particles and a latent catalyst therefor which is a water-soluble salt of a cationic polyamine having a molecular weight of more than 1,000.
• a distearic acid anhydride sizing is catalyzed with the polyamine salt of cationic starch.
• US patent 4 040 900 for sizing paper products utilizes a sizing emulsion consisting of 80-97 parts of substituted cyclic dicarboxylic anhydride such as ASA and 3-20 parts of a polyoxyalkylene alkyl or alkylaryl ether or the corresponding mono or diester.
• a cationic retention agent can be dispersed.
• a papermaking sizing agent which consists of an aqueous dispersion of substituted succinic anhydrides wherein the aqueous medium also contains an ampholytic acrylamide type polymer.
• this ampholytic polymer is an acrylamide type polymer having 3-50 mol% of cationic groups and 5-15 mol% of anionic groups.
• the cationic groups can be the result of a Mannich reaction.
• ampholytic does not include the cationic or cationically modified vinyl addition polymers used in the present invention.
• the EPA 141 641 discloses aqueous sizing dispersions prepared by dilution of anhydrous concentrates comprising a reactive size such as ketene dimer or alkenyl succinic anhydride and a polyelectrolyte which can be cationic, anionic or non-ionic. Copolymers of acrylamide with quaternized dimethylaminoethyl acrylate or methacrylate can be used as cationic polyelectrolyte. An advantage is that the polyelectrolyte can have a higher molecular weight. Tested compositions contain polyelectrolytes which have a molecular weight in the order above 106.
• the present invention provides a method for preparing an emulsified sizing agent useful in the preparation of sized paper products, such emulsion containing water, a cyclic dicarboxylic acid anhydride having the following structural formula: wherein R represents a dimethylene or trimethylene radical, and wherein R1 is a hydrophobic group containing more than 5 carbon atoms which may be selected from the group consisting of alkyl, alkenyl, aralkyl or aralkenyl groups, and a water soluble cationic vinyl addition polymer, characterized in that the cationic vinyl addition polymer has a molecular weight of between 20.000 and 750.000 and is made of at least 10 weight-% and up to 100 weight-% of the mer content of the polymer from one or more cationic or cationically modified vinyl addition monomers selected from the group consisting of
• the present invention provides a method for the sizing of paper, wherein such an emulsion of a cyclic dicarboxylic acid anhydride is applied to the paper stock and the cyclic dicarboxylic acid anhydride is emulsified by the water soluble cationic vinyl addition polymer.
• the present invention also provides an emulsion of a cyclic dicarboxylic acid anhyride having the following structural formula: wherein R represents a dimethylene or trimethylene radical, and wherein R1 is a hydrophobic group containing more than 5 carbon atoms which may be selected from the group consisting of alkyl, alkenyl, aralkyl or aralkenyl groups, the emulsion comprising:
• the invention provides for utilization of certain specific cationic water soluble vinyl addition polymers having molecular weights of between 50 000 and 150 000 as additives and emulsifying agents for ASA sizes.
• Such cationic vinyl addition polymers serve as useful emulsifying agents for the ASA size and in addition increase the retention of the size upon the cellulosic sheet.
• ASA sizes to which this invention is applicable include those mentioned in U.S. patents 3,102,061, 4,040,900, 3,968,005, and 3,821,069.
• ASA sizes utilized in this invention are generally described by the structural formula shown above.
• a surfactant has also been employed in making the ASA sizes of this invention.
• This surfactant may be anionic, non-ionic, or cationic in nature.
• Surfactants employed are generally water soluble and have HLB values ranging from about 8 to about 30 or higher, and preferably from about 8-15.
• the surfactant is generally used to prepare the ASA size by simply mixing it with the raw ASA material.
• the ASA size used in this invention accordingly, and in a preferred embodiment of this invention, will generally contain 75-99.5 parts by weight of ASA and preferably 90-99 parts by weight of ASA with 0.5-25 parts, preferably .75-10 parts, and most preferably 1.0-5 parts by weight of surfactant.
• the surfactants are preferably added to the ASA prior to emulsification in the aqueous medium.
• the surfactants can also be added to the aqueous medium prior to the addition of the ASA.
• Classes of materials useful as surfactants include; ethoxylated alkyl phenols, such as nonyl phenoxy polyethoxy ethanols and octyl phenoxy polyethoxy ethanols; poly ethyleneglycols such as PEG 400 monooloate, and PEG 600 dilaurate; at well is other materials including certain ethoxylated phosphate esters.
• Preferred surfactants for use are free acids of complex organic phosphate esters, commercial availible as GAFAC R RM510 and GAFAC R RE610.
• the water soluble polymers used as cationic agents are water soluble vinyl addition homopolymers and copolymers having molecular weights of betweeen 50 000 and 150 000 where at least 10 weight percent and up to 100 weight percent of the mer content of the polymer is a cationic monomer, or cationically modified monomer selected from the indicated group. Preferably at least 15 and up to 95 weight percent of the mer units in the polymer is provided by the cationic or cationically modified monomers. Most preferably from 20-75 percent by weight of the mer units in the polymer or copolymer are cationic or cationically modified. These polymers are not ampholytic.
• Polymers which can be employed in the practice of this invention include, but are not limited to the following exemplary copolymers and homopolymers: acrylamide-dimethylaminoethylactylate, acrylamide-dimethylaminoethylacrylate quaternaries, acrylamide-diethylaminoethylacrylate, acrylamide-diethylaminoethylacrylate quaternaries. acrylamide-dimethylaminoethylmethacrylate, acrylamide-dimethylaminoethylmethacrylate quaternaries.
• acrylamide-diallyldimethyl ammonium chloride polydimethylaminoethylmethacrylate and its quaternaries, polymethacrylamidopropyltrimethyl ammonium chloride and, acrylamide-methacrylamidopropyltrimethyl ammonium chloride.
• polymers and copolymers of acrylamide which have been subjected to a "Mannich” reaction with formaldehyde and a lower alkyl secondary amine. These polymers may or may not be quaternized.
• the polymers employed may be copolymers and even terpolymers of the various vinyl addition monomers. While acrylamide is a preferred nonionic monomer for use in preparing copolymers useful in this invention, other nonionic monomers such as methacrylamide can be employed.
• Polymers as used in this invention may be in the form of water-in-oil emulsions (such as those described in U.S. Re. patent 28,474 and 28,576), dry powders, or dilute aqueous solutions.
• the polymers Preferably form an oil-in-water emulsion of the alkenyl succinic anhydride sizing material.
• an aqueous solution must first be prepared of the polymer.
• the water soluble surfactants used to invert the water-in-oil emulsions have no detrimental effect on the activity of the polymer used to emulsify the ASA size.
• the final size emulsion to be added to the pulp furnish may be polymer.
• the ASA emulsions fed to the pulp slurry accordingly to this invention will generally contain: 50 - 99.9 % by weight water .01 - 50 % by weight ASA .001 - 25.0 % by weight (preferably .005 - 3.0 %) of the water soluble polymer
• these emulsions will contain: 60 - 99.9 % water .01 - 40 % ASA .010 - 10 % polymer
• Most preferably the ASA emulsion contain .01 - 5.0 and generally .01 - 1.0 parts by weight of the polymer and even more preferable, .05 - .9 parts polymer for each part of ASA in the emulsion.
• the ASA emulsion contains .01 - 7.5 and generally .01 - 5.0 parts by weight of the polymer.
• the polymers may be used to emulsify the ASA, or may be added to previously formed ASA emulsions. In either case, the polymer will increase the performance of the emulsion compared to emulsions not containing the polymer.
• conventional emulsifying agents should be used in addition to the polymer.
• no additional emulsifier need be employed.
• a solution acrylamide copolymer of type MAPTAC was evaluated as ASA emulsification and retention aid.
• This novel sizing composition was compared in terms of ASA particle size, physical emulsion stability and sizing performance to conventional ASA emulsions in water or cationic starch. Description of these polymers are given in Table I.
• ASA emulsions in water were prepared by combining 95 parts of distilled water and 5 parts of ASA in an Eberbach semi-microemulsion cup. The mixture was dispersed for 3 minutes at high speed. The emulsion formed was diluted with distilled water to 0.50 percent ASA solids basis and used in Example 1.
• ASA emulsions in cationic starch were prepared by first hydrating 5 parts of a pregelatinized cationic potato starch in 95 parts of water and agitating for 30 minutes. Size emulsions were then prepared by combining 75 parts of the starch solution with 25 parts of ASA in the emulsion cup and dispersing for 20 seconds. This emulsion was diluted to 0.50 percent ASA solids basis and used in Example 2.
• ASA emulsions in vinyl addition polymers were prepared by dispersing ASA in polymer solutions at a ratio of 5:1 dry solids basis. These emulsions were diluted to 0.50 percent ASA solids basis by the method described above. Examples 3-8 illustrate the novel use of these addition polymers.
• the ASA emulsions were tested separately in a paper slurry of composition 50 percent recycled corrugated boxboard, 50 percent recycled newsprint. Other slurry parameters were 0.5 percent consistency, 400 Canadian Standard Freeness, pH 7.5, and 25 degrees Celsius to which was added 12.5 parts per million of hydrated aluminum sulfate. Handsheets of basis weight 22.7kg (50 pounds) per 306.9m2 (3300 square feet) were prepared in accordance with TAPPI T-205 procedures. The sizing compositions listed above were added to the paper slurry shortly before wet-web formation at dosages of 0.10 and 0.15 percent on paper solids. Handsheets were immediately dried on rotary drum to 98 percent solids basis. Results are shown on Table I.
• Vinyl addition polymers such as copolymers of acrylamide with DMAEM-MeCl quat or MAPTAC, were further evaluated as ASA emulsification and retention aids. These novel sizing compositions were compared in terms of ASA emulsion particle size, physical emulsion stability with aging, and sizing performance to conventional ASA emulsions in water or cationic starch. A description of these polymers is shown in Table II.
• ASA emulsions in water were prepared by combining 95 parts of distilled water and 5 parts of ASA in a laboratory 8 ounce Osterizer cup. The mixture was dispersed at high speed for 3 minutes. The emulsion formed was diluted with distilled water to 0.50 percent ASA solids basis and used in Example 9.
• ASA emulsions in cationic starch solutions were prepared by first hydrating 5 parts of a pregelatinized cationic potato starch in 95 parts of water and agitating for 30 minutes. Size emulsions were then prepared by combining 95 parts of the starch solution with 5 parts of ASA in the Osterizer cup and dispersing the size for 25 seconds. This emulsion was diluted to 0.50 percent ASA solids basis and used in Example 10.
• ASA emulsions in vinyl addition polymers were prepared by dispersing ASA in the polymer solutions at a ratio of 1:1 ASA to polymer solids in the Osterizer cup for 5 to 30 seconds.
• ASA emulsion was tested separately in a paper slurry of composition 50 percent bleached softwood kraft and 50 percent bleached hardwood kraft pulps.
• the other slurry parameters were 0.5 percent consistency, 330 Canadian Standard Freeness, pH 7.3, and 27 degrees Celsius.
• Handsheets of basis weight 22.7kg (50 pounds) per 306,9m2 (3300 square feet) were prepared in accordance with TAPPI T-205 procedures.
• the sizing compositions listed below were added to the paper slurry shortly before wet web formation at the dosage of 0.20 percent ASA solids on paper solids. Handsheets were immediately pressed to approximately 50 percent residual moisture and dried on a rotary drum dryer to 98 percent paper solids basis. Results are shown in the attached Table II.
• the following comparative examples further illustrate the use of acrylamide copolymers of type DMAEM-MeSQ, DMAEA-MeSQ, DFAEA-MeSQ, and DADMAC of molecular weights greater than 1 000.000 as emulsifiers and retention aids for alkenyl succinic anhydride sizing compositions, and conventional emulsions prepared from cationic starch.
• ASA emulsions in water were prepared by combining 95 parts of distilled water and 5 part of ASA in an Eberbach semi-microemulsion cup and dispersing the size for 60 seconds. The resulting emulsion was diluted to 0.50 percent ASA solids basis with water and used in Example 17.
• the ASA emulsions in cationic starch were prepared by first hydrating three parts of a pregelatinized cationic potato starch in 97 parts agitated cold water for 30 minutes.
• Emulsions were then prepared at two ASA to starch solid ratios of 10:1 and 3:1 by dispersing 30 parts of ASA in 70 parts of 3 percent cationic starch or 9 parts of ASA in 91 parts of 3 percent cationic starch respectively with the aid of the semi-microemulsion cup.
• the resulting emulsions were diluted to 0.5 percent ASA solids basis with water and used in Examples 17 and 18 accordingly.
• Polymer solutions were prepared by hydrating 0.6 parts (as polymer solids) of those copolymers of acrylamide listed below in 99.4 parts of water respectively, allowing sufficient time and mixing for complete hydration.
• Emulsions were than prepared at two ASA to polymer solids ratios of 10:1 and 3:1 by dispersing 6 parts of ASA in 94 parts of 0.6 percent polymer solids solution or 1.8 parts of ASA in 98.2 parts of 0.6 percent polymer solids solution respectively with the aid of the semi-microemulsion cup.
• ASA emulsions were separately added to a 0.5 percent consistency pulp slurry of composition 40 percent bleached hardwood sulfate pulp. 40 percent bleached softwood sulfate pulp, and 20 percent calcium carbonate of 300 Canadian Standard Freeness [pH 8.2). Handsheets of basis weight 22.7kg (50 pounds) per 306.9m2 (3300 square feet) were prepared in accordance with TAPPI T-205 procedures. Emulsions of ASA were added to the pulp slurry shortly before wet-web formation at dosages of 0.250 and 2.00 percent on dry pulp solids. Handsheets were immediately dried on a rotary drum dryer to 98 percent solids basis (2 percent residual moisture). Results are shown in Table III.
• polymers in the high molecular weight range can lead to the formation of tacky deposits and unstable emulsions.
• the use of polymers having molecular weights in the range of from 50,000 - 150,000 led to the elimination of the deposit formation noted above, and increased the stability of the ASA emulsions so prepared.
• the ASA chosen for this and all subsequent studies is a substituted (alkenyl) cyclic dicarboxylic acid anhydride wherein the alkenyl groups are derived from a mixture of 14-22 carbon atoms.
• the ASA size measure used in these tests was prepared by mixing 196 gms. of the polymer solution with 4.0 gms. of a commercial paper grade alkenyl succinic anhydride size available from Chevron Chemical Company, containing 1.0% by weight of Gafac® RM-510 surfactant available from GAF Corporation. The resultant mixture was then emulsified by mixing for 30 seconds in an Eberbach semi-microemulsion cup followed by a final dilution of 0.5% ASA solids. The ASA emulsions were added to a commercial, calcium carbonate filled bleached Kraft furnish dosed at 0.25 % on dry pulp solids.
• the neutral ink penetration test describes the paper's resistance to aqueous fluid penetration and is a measurement of time (in seconds) for ink to penetrate paper to a predetermined degree (80 percent reflectance endpoint). The greater the time, the greater the paper's resistance to ink penetration.
• the following examples further illustrate the novel use of acrylamide copolymers of type DMAEM-MeSQ as emulsifiers and retention aids for alkenyl succinic anhydride sizing compositions.
• the ASA emulsions thus formed were compared in terms of particle size and sizing performance with respect to ASA water emulsions and conventional emulsions prepared from cationic starch.
• ASA emulsions in water were prepared by combining 95 parts of distilled water and 5 parts of ASA in an Eberbach semi-microemulsion cup and dispersing the size for 60 seconds. The resulting emulsion was diluted to 0.50 percent ASA solids basis with water and used for the two sets.
• the ASA emulsions in cationic starch were prepared by first hydrating three parts of a pregelatinized cationic potato starch in 97 parts agitated cold water for 30 minutes.
• Emulsions were then prepared at two ASA to starch solid ratios of 10:1 and 1:1 by dispersing 30 parts of ASA in 70 parts of 3 percent cationic starch or 3 parts of ASA in 97 parts of 3 percent cationic starch respectively with the aid of the semi-microemulsion cup.
• the resulting emulsions were diluted to 0.5 percent ASA solids basis with water and used accordingly.
• Polymer solutions were prepared by hydrating 0.6 parts (as polymers) of those copolymers of acrylamide listed below in 99.4 parts of water respectively, allowing sufficient time and mixing for complete hydration.
• Emulsions of ASA in polymer were then prepared by dispersing 6 parts of ASA in 94 parts of 0.6 percent polymer for 60 seconds with the aid of the semi-microemulsion cup. A further dilution to 0.5 percent ASA solids was then taken.
• this example illustrates the advantages offered by this invention: the ability of these cationic water soluble acrylamide copolymers to initiate and maintain a stable ASA emulsion and to render the ASA emulsion particles cellulose substantive.
• Polymers tested include the following: Polymer Mole Percent (M%) Acrylamide Copolymer Quat AA 3.5 M% DMAEM1-MeSQ BB 7.7 M% DMAEM-MeSQ CC 10.9 M% DMAEM-MeSQ 1 Dimethylaminoethylmethacrylate methylsulfate quat.
• ASA emulsions were separately added to a 0.5 percent consistency pulp slurry of compostion 40 percent bleached hardwood sulfate pulp, 40 percent bleached softwood sulfate pulp, and 20 percent calcium carbonate of 300 Canadian Standard Freeness (pH 8.2).
• Handsheets of basis weight 22.7kg (50 pounds) per 306.9m2 (3300 square feet) were prepared in accordance with TAPPI T-205 procedures.
• Emulsions of ASA were added to the pulp slurry shortly before wet-web formation at dosages ranging from 0.125 to 2.00 percent. Handsheets were immediately dried on a rotary drum dryer to 98 percent solids basis (2 percent residual moisture). In another variation of this procedure, 0.025 percent of a polymer was added to the pulp slurry separately after addition of sizing emulsions. Results are shown in Table V.

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• 1985
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  • 1985-01-25 ES ES539847A patent/ES8609428A1/es not_active Expired
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  • 1985-01-25 DE DE8585100782T patent/DE3583688D1/de not_active Expired - Lifetime
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