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
  • 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
• • 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
  • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon

Definitions

• the present invention relates to a sizing agent composition for printing paper, and more specifically relates to a sizing agent composition for printing paper which improves the printing characteristics and sheet separating characteristics of printing paper.
• the object of the present invention is to provide a sizing agent composition for printing paper which can provide various types of printing papers such as papers used in black and white electronic copiers used in business applications, papers used in color copiers, papers used in ink jet printers, and receiving papers used in facsimile machines with superior sheet separating characteristics, printing characteristics, and copying characteristics.
• the present invention is a printing paper sizing agent composition
• an aqueous emulsion comprising (A) water-insoluble organopolysiloxane comprising (a) an alkyl group or aralkyl group having 2 to 20 carbon atoms, and (b) an amino group in each molecule and (B) a sizing agent.
• the present invention is a printing paper sizing agent composition
• an aqueous emulsion comprising (A) water-insoluble organopolysiloxane comprising (a) an alkyl group or aralkyl group having 2 to 20 carbon atoms and (b) an amino group in each molecule and (B) a sizing agent.
• component (A) is a component which not only improves the sheet separating characteristics by providing the printing paper with release characteristics, lubrication, smoothness, and anti-blocking characteristics, but also improves the water resistance by making the binder component of component (B) hydrophobic, and which also imparts the effect of fixing pigments to ink jet printer media and sublimation type printer media.
• the organopolysiloxane of component (A) contains at least one (a) alkyl group or aralkyl group having 2 to 20 carbon atoms and (b) amino group per molecule and is water-insoluble.
• the water insolubility of this component can be assessed by the fact that separation into two layers occurs when component (A) and an equal amount of water are placed in a beaker and agitated and this mixture is allowed to stand for 24 hours.
• the molecular structure of the organopolysiloxane may be linear, branched or cyclic, and there are no particular restrictions on the type of organopolysiloxane used.
• Examples of the abovementioned (a) alkyl group or aralkyl group having 2 to 20 carbon atoms include ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl, dodecyl, phenylmethyl, and phenylethyl. It is desirable that the abovementioned (b) amino group(s) be groups in which the nitrogen atom is bonded to a silicon atom via a carbon atom. Specific examples of such amino groups include amino groups described by the formula -Q-(NHCH 2 CH 2 ) a NHR 1 .
• Q represents a divalent hydrocarbon group: Specific examples of such divalent hydrocarbon groups include alkylene groups such as methylene, ethylene, propylene, and butylene, arylene groups described by formula-C 6 H 4 -, and alkylene-arylene groups described by formula -(CH 2 ) 2 C 6 H 4 -. Among these groups, propylene groups are most commonly used.
• R 1 represents a hydrogen atom or a monovalent hydrocarbon group; examples of monovalent hydrocarbon groups include methyl, ethyl, propyl, phenyl, and cyclohexyl.
• a is an integer from 0 to 5, with 0 or one being most common. Groups described by the following formulae may be cited as examples of such amino groups.
• Linear diorganopolysiloxanes described by the following mean formula may be cited as examples of the organopolysiloxane comprising component (A):
• R represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms.
• Such groups include saturated aliphatic hydrocarbon groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl, and dodecyl; unsaturated aliphatic hydrocarbon groups such as vinyl, allyl, and hexenyl; aromatic hydrocarbon groups such as phenyl, tolyl, and naphthyl; and halogen-substituted hydrocarbon groups in which some of the hydrogen atoms bonded to the carbon atoms of the abovementioned groups are substituted by halogen atoms.
• methyl groups are most commonly used.
• R 2 represents an alkyl group or aralkyl group having 2 to 20 carbon atoms; examples of alkyl groups that can be used include ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl, and dodecyl, and examples of aralkyl groups that can be used include phenylmethyl and phenylethyl.
• the present composition is used for sizing full-color printer paper, ink jet printer paper, or sublimation type printer paper
• a cycloorganosiloxane which has an alkyl group or aralkyl group having 2 to 20 carbon atoms is used as a copolymerized component.
• X represents a group selected from the group consisting of substituted or unsubstituted monovalent hydrocarbon groups having 1 to 20 carbon atoms, hydroxy groups, alkoxy groups having 1 to 5 carbon atoms, and amino groups described by formula -Q-(NHCH 2 CH 2 ) a NHR 1 .
• monovalent hydrocarbon groups that can be used include the same groups as those described for the abovementioned R.
• alkoxy groups that can be used include methoxy, ethoxy, propoxy, and butoxy.
• amino groups that can be used include the same groups as those described above.
• 1 is 0 or an integer equal to or greater than 1.
• the value of 1 is preferably in the range of 10 to 1000 and is even more preferably in the range of 50 to 500.
• the value of m is 0 or an integer equal to or greater than 1.
• the value of m is preferably in the range of 2 to 200 and is even more preferably in the range of 5 to 100.
• X at the ends of the molecular chain be an alkyl group or aralkyl group having 2 to 20 carbon atoms.
• the value n is 0 or an integer equal to or greater than 1. It is desirable that n be in the range of 2 to 30 and a range of 2 to 20 is even more desirable.
• X at the ends of the molecular change be an amino group described by formula -Q-(NHCH 2 CH 2 ) a NHR 1 .
• R 1 , Q, and a are the same as described above.
• siloxane units described by formula it is desirable from the standpoints of affinity for pigments and compatibility that siloxane units described by formula be more numerous than siloxane units described by formula
• the viscosity of the organopolysiloxane comprising component (A) at 25°C is ordinarily in the range of 10 to 10,000 mm 2 /s, and is preferably in the range of 50 to 10,000 mm 2 /s.
• organopolysiloxane comprising component (A) examples include organopolysiloxanes described by the following formulae: In the above formulae the large circle symbol represents phenyl.
• the abovementioned organopolysiloxane comprising component (A) can be manufactured by hydrolyzing an aminopropyl(methyl)dialkoxysilane described by formula H 2 N(CH 2 ) 3 Si(CH 3 )(OCH 3 ) 2 in an excess of water, causing the equilibrium polymerization of the hydrolyzed condensate thus obtained with octamethylcyclotetrasiloxane and tetramethyltetradecylcyclotetrasiloxane by heating a mixture of these compounds to a temperature of 80 to 110°C in the presence of a basic catalyst such as sodium hydroxide, and then neutralizing the basic catalyst with an acid at the point in time at which the desired viscosity is reached (see Japanese Patent Application Kokai No. Sho 53-98499).
• a basic catalyst such as sodium hydroxide
• the sizing agent comprising component (B) is a binder component which is ordinarily used to fix and hold titanium dioxide, barium sulfate, diatomaceous earth, calcium carbonate, talc, kaolin, silica, alumina or a cationic polymer, etc., on the surface (one side or both sides) of electronic copier papers, coated papers used for facsimile transmission, color printing papers, or papers used as ink jet printing media, etc.
• substances used as this component (B) include starches such as wheat flour starch, corn starch, rice flour, and potato starch; cellulose derivatives such as casein, carboxymethylcellulose, methylcellulose, and hydroxyethyl; synthetic sizing agents such as polyvinyl alcohols and polyvinyl methyl ethers; polyacrylic acid esters that act as aqueous binders, latexes such as styrene-butadiene rubbers, and urethane emulsions.
• starches such as wheat flour starch, corn starch, rice flour, and potato starch
• cellulose derivatives such as casein, carboxymethylcellulose, methylcellulose, and hydroxyethyl
• synthetic sizing agents such as polyvinyl alcohols and polyvinyl methyl ethers
• polyacrylic acid esters that act as aqueous binders, latexes such as styrene-butadiene rubbers, and urethane emulsions.
• sizing agents (B-1) that have an emulsifying capacity are carboxymethylcellulose, methylcellulose, and polyvinyl alcohols; all other sizing agents are sizing agents (B-2) that have no emulsifying capacity.
• desirable examples of component (B) include casein and cellulose derivatives such as carboxymethylcellulose, methylcellulose and hydroxyethylcellulose, as well as polyvinyl alcohols, polyvinyl methyl ethers, and polyacrylic acid esters.
• Sizing agents (B-1) that have an emulsifying capacity, such as carboxymethylcellulose, methylcellulose, and polyvinyl alcohols are most desirable.
• the abovementioned aqueous emulsion can be prepared without using a surfactant.
• a uniform, stable emulsion can be obtained by dissolving or dispersing a polyvinyl alcohol constituting component (B-1) in water, adding component (A) to this solution or dispersion, and then mixing these components or passing the mixture through an emulsifying machine.
• component (B-1) and a surfactant (D) that has an emulsifying capacity may be used in combination.
• a surfactant (D) that has an emulsifying capacity is required.
• the organopolysiloxane comprising component (A) be mixed with the sizing agent of component (B-2) after component (A) is emulsified using a nonionic surfactant alone, or a mixture of a nonionic surfactant and a cationic surfactant, as the surfactant of component (D).
• the method used to emulsify component (A) beforehand is ordinarily a method in which component (A) and component (D) are blended together, after which a small amount of water is added, and emulsification is performed by means of an emulsifying machine such as a colloid mill, homo-mixer, or line mixer.
• an emulsifying machine such as a colloid mill, homo-mixer, or line mixer.
• nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyalkylene alkyl esters, and sorbitan alkyl esters.
• a quaternary ammonium salt type surfactant is most typically used as a cationic surfactant.
• a desirable emulsion can be obtained by mixing 3 to 5 parts by weight of a nonionic surfactant, 0 to 1.5 parts by weight of a cationic surfactant, and 73.5 to 77 parts by weight of water with 20 parts by weight of component (A).
• component (B) is ordinarily used after being dispersed in water.
• the water used in the present invention is used to dilute and uniformly disperse the abovementioned component (A) and component (B).
• This component is indispensable for applying the composition of the present invention to the surface of the printing paper as a thin coating.
• the present composition is an aqueous emulsion which contains the abovementioned component (A) and component (B) as essential components; however, depending on the purpose and intended use of the printing paper involved, fillers and trifunctional aminosilanes may be added in order to increase the strength of the printing paper.
• fillers include titanium dioxide, barium sulfate, diatomaceous earth, calcium carbonate, talc, kaolin, silica, alumina, and cationic polymers.
• trifunctional aminosilanes examples include the alkoxysilanes described by the following formulae: Formula: (C 2 H 5 O) 3 SiC 3 H 6 NH 2 Formula: (CH 3 O) 3 SiC 3 H 6 NHC 2 H 4 NH 2
• the mixture ratios of the respective components in the present composition vary according to the types and amounts of the components used and are not particularly restricted. However, it is desirable that the organopolysiloxane comprising component (A) comprise 3 to 40 wt % of the composition, that the sizing agent of component (B) comprise 3 to 10 wt % of the composition, and that the remaining 50 to 94 wt % of the composition be water. It is desirable that a stock solution of the present composition be prepared at these mixture proportions and that this stock solution be diluted with a 10- to 100-fold amount of water at the time of use, with an appropriate amount of the sizing agent of component (B) being added if necessary.
• Examples of methods which can be used to apply the present composition to a printing paper include a method in which the printing paper is immersed in a water-diluted solution of the present composition, a method in which a water-diluted solution of the present composition is applied to the printing paper as a coating, a method in which the present composition is added prior to the papermaking process, and a method in which a water-diluted solution of the present composition is sprayed onto the printing paper.
• the abovementioned coating method is optimal; a small amount of the present composition can be applied as a thin, uniform coating by using, for example, an air doctor coater, blade coater, transfer roll coater, bar coating, or reverse roll coater.
• printing papers to which the present composition can be applied include not only papers consisting of virgin pulp and recycled papers, but also synthetic papers such as polypropylene and polystyrene papers.
• Printing papers treated with the present composition are superior in terms of smoothness, lubrication, water resistance, and anti-blocking properties. Accordingly, even in the case of high-speed continuous copying by means of an electronic copier under conditions of high humidity, there is no superimposition of sheets during printing, so that the sheet separating characteristics are extremely good. As a result, in the case of heat-sensitive facsimile paper using the present composition, facsimile transmissions can be performed by re-utilizing receiving paper "as is”. Furthermore, in the case of full-color copies the printing characteristics and copying characteristics are greatly improved and the carrying of pigments is also good so that vivid color copies can be obtained.
• the present sizing agent composition is suitable for use not only on papers used for the recording of business information such as printing papers used in black and white or color electronic copiers and heat-sensitive papers used in facsimile machines, but also on ink jet printer media and sublimation type printer media.
• Working Example 1 30 Parts by weight of a water-insoluble diorganopolysiloxane with a viscosity of 1050 mm 2 /s, which contained amino groups and long-chain alkyl groups, and which is described by mean formula was mixed for 30 minutes with an aqueous solution prepared beforehand by uniformly dissolving and dispersing 3 parts of a polyvinyl alcohol (manufactured by Nippon Gosei K.K., 1:1 mixture of Gosenol GL14 and GL05 (commercial names)). Afterward, an aqueous emulsion was prepared by passing this mixture through a colloid mill type emulsifying machine.
• a polyvinyl alcohol manufactured by Nippon Gosei K.K., 1:1 mixture of Gosenol GL14 and GL05 (commercial names)
• Treatment solution A (0.3% diorganopolysiloxane, 0.03% polyvinyl alcohol, 99.67% water) which was prepared by adding water to the abovementioned aqueous emulsion so that the emulsion was diluted 100 times was uniformly sprayed by means of a simple spray gun onto an A4 size recycled paper (Bright Recycled Paper manufactured by Fuji Xerox Office Supply Co.) so that the amount of treatment solution A applied was 5g per m 2 , and this coated paper was dried (the amount of adhering diorganopolysiloxane was 0.015 g/m 2 , and the amount of adhering polyvinyl alcohol was 0.0015 g/m 2 ).
• Comparative Example 1 When copying was performed in the same manner as in Working Example 1 using recycled paper that was not treated with the abovementioned aqueous emulsion, the black and white characters were very slightly broken up, and the sharpness of the photographs was also slightly inferior to that in the copies obtained in Working Example 1.
• Comparative Example 2 An aqueous emulsion was prepared in the same manner as in Working Example 1, except that an amino-group-containing diorganopolysiloxane described by mean formula was used instead of the diorganopolysiloxane containing amino groups and long-chain alkyl groups used in Working Example 1. A recycled paper was treated with this emulsion in the same manner as in Working Example 1. Copying was performed in the same manner as in Working Example 1 using the recycled paper thus obtained. A slight amount of discoloration occurred so that sharp color copying could not be achieved.
• Comparative Example 3 An aqueous emulsion was prepared in the same manner as in Working Example 1, except that a dimethylpolysiloxane described by mean formula was used instead of the diorganopolysiloxane containing amino groups and long-chain alkyl groups used in Working Example 1. A recycled paper was treated with this emulsion in the same manner as in Working Example 1. Copying was performed in the same manner as in Working Example 1 using the recycled paper thus obtained. A slight amount of discoloration occurred so that sharp color copying could not be achieved.
• dimethylpolysiloxane had a low affinity and compatibility with pigments such as the red, yellow, and blue pigments used in full-color copying, so that this dimethylpolysiloxane had a poor ability to adapt to color printing paper.
• Treatment solution A prepared in Working Example 1 was uniformly blown (by means of a simple spray gun) onto the printing surface of a heat-sensitive facsimile recording paper (FAX-T210B-30 manufactured by Tokuyo K.K. (high sensitivity, A4 size width, continuous roll)) which had been spread and extended to a length of approximately 3 m, so that the amount of treatment solution A applied as a coating was 5 g per square meter. Afterward, this coating was dried. When the paper was subsequently rolled up and set in a facsimile machine, and a transmission consisting of three sheets of A4 size paper was received, there were no breaks in the characters, and clear printing was accomplished.
• a heat-sensitive facsimile recording paper FAX-T210B-30 manufactured by Tokuyo K.K. (high sensitivity, A4 size width, continuous roll)
• Comparative Example 4 Three sheets of heat-sensitive recording paper for facsimile use which had not been treated with the abovementioned aqueous emulsion, were stacked together and several transmissions were made with a facsimile machine in the same manner as in Working Example 2. As a result, the three sheets were transmitted while still stacked together, or the first sheet was smoothly transmitted while the second and third sheets were transmitted while still stacked together so that the complete text could not be transmitted.
• Treatment solution B which was prepared by diluting the abovementioned aqueous emulsion with a 20-fold amount of water, was uniformly sprayed by means of a simple spray gun onto the printing surface of a heat-sensitive recording paper (manufactured by Tokuyo K.K.; FAX-T210B-30 (high sensitivity, A4 width, continuous roll) that was spread to a length of approximately 3 m so that the amount of treatment solution B that was applied was 5 g per m 2 .
• This coated paper was then dried (the amount of adhering diorganopolysiloxane was 0.025 g/m 2 and the amount of adhering methylcellulose was 0.0125 g/m 2 ).

Landscapes

• Compositions Of Macromolecular Compounds (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=17556742

Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (1)

Citations (6)

• 1999
  • 1999-09-29 JP JP27553099A patent/JP2001098156A/ja active Pending
• 2000
  • 2000-09-29 EP EP00308618A patent/EP1088939A1/de not_active Withdrawn

Patent Citations (6)

Also Published As

Similar Documents

Legal Events