Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
  • B41M5/1246—Application of the layer, e.g. by printing
• • 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
  • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
  • D21H13/10—Organic non-cellulose fibres
  • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
• • 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
  • D21H5/00—Special paper or cardboard not otherwise provided for
  • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
  • D21H5/20—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres
  • D21H5/202—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of organic non-cellulosic fibres too short for spinning, with or without cellulose fibres polyolefins
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
  • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers
  • Y10T428/3188—Next to cellulosic
  • Y10T428/31895—Paper or wood
  • Y10T428/31899—Addition polymer of hydrocarbon[s] only
  • Y10T428/31902—Monoethylenically unsaturated
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31971—Of carbohydrate
  • Y10T428/31993—Of paper

Definitions

• PAPER MATERIAL FOR PRESSURE SENSITIVE RECORDING SYSTEM BACKGROUND OF THE INVENTION This invention relates to a pressure sensitive recording system and more particularly to a paper materal for the pressure sensitive recording system.
• CMOS complementary metal-oxide-semiconductor
• color former an electron donor-acceptor color-forming reaction between a colorless dye material and a color forming reactant acid material.
• color former an electron donor-acceptor color-forming reaction between a colorless dye material and a color forming reactant acid material.
• color former an electron donor-acceptor color-forming reaction between a colorless dye material and a color forming reactant acid material.
• color former color former
• color acceptor color acceptor
• U.S. Pat. No. 2,730,456 discloses a transfer-copy system wherein minute oil droplets in which a color former is dispersed or dissolved are encapsulated and coated onto a transfer sheet.
• the color former is thereafter transferred to a receiving sheet by rupturing said capsules.
• the underlying receiving sheet has a color reactant coating thereon containing a color acceptor which will react with the color former causing a visible colored mark at points where the microcapsules have been ruptured and the color former has been transferred.
• US. Pat. No. 2,730,457 discloses another type of a pressure-sensitive record sheet.
• this pressure-sensitive record sheet there are disposed on one surface of the same sheet both the color acceptor and the cap sules containing oil droplets in which the color former is dissolved.
• This record material is known as a self contained system.
• color formers which are preferably used, there are crystal violet lactone, benzoyl leucomethylene blue, malachite green lactone, rhodamine lactone, fluoran derivatives, spironpiran, mixtures thereof and etc.
• non-volatile oils such as alalkylbiphenyl, diarylmethane, terphenyl derivatives, dibenzylbenzene, liquid paraffin, castor oil, olive oil, rape oil and cotton seed oil.
• color acceptors there are known inorganic compounds such as acid clay, activated clay, bentonite, kaolin, zinc oxide, zinc hydroxide, zinc carbonate and etc. and organic compounds such as aromatic carboxylic acids, multivalent metallic salts of aromatic carboxylic acids, aromatic carboxylic acid polymers, multivalent metallic salts of aromatic carboxylic acid polymers, phenols, phenol polymers, multivalent metallic salts of phenol polymers mixtures thereof and etc.
• inorganic compounds such as acid clay, activated clay, bentonite, kaolin, zinc oxide, zinc hydroxide, zinc carbonate and etc.
• organic compounds such as aromatic carboxylic acids, multivalent metallic salts of aromatic carboxylic acids, aromatic carboxylic acid polymers, multivalent metallic salts of aromatic carboxylic acid polymers, phenols, phenol polymers, multivalent metallic salts of phenol polymers mixtures thereof and etc.
• the primary object of the invention is to provide an improved paper material for the pressure sensitive recording system in which the above mentioned disadvantages can be avoided.
• Particularly one of the objects of the invention is to provide an improved paper material for the pressure sensitive recording system in which the so-called smudge which will be caused during storing and transportating the products can be prevented.
• Another object of the invention is to provide an improved paper material for the pressure sensitive recording system which has a good brightness and opacity as required.
• a further object of the invention is to provide an improved paper material for the pressure sensitive recording system which has an improved dimensional stability against humidity.
• a still further object of the invention is to provide an improved paper material for the pressure sensitive recording system which is relatively light in addition to the above mentioned advantages.
• the paper material for the pressure sensitive recording system comprises a support sheet having, disposed on at least one of the surface thereof, at least one color producing reactant selected from the group consisting of a color former which is dissolved in an oil and contained in microcapsules and a color acceptor reactive with said color former to produce a color image.
• the support sheet is formed of a fibrous material. A part of the fibrous material is synthetic one.
• the support sheet has a COEITICI' ent of tetralin penetration rate of 600 X 10 cm/min" or less.
• the coefficient of tetralin penetration rate is represented by K in the following formula:
• the synthetic fibrous material used in the invention has a specific surface area of at least 0.7 m /g.
• the synthetic fibrous material contains at least 50% by weight alpha-olefin unit therein.
• the synthetic fibrous material may preferably be used in the support sheet in such an amount that the amount of alpha-olefin unit of said synthetic fibrous material is at least 4% by weight with respect to the total amount of the fibrous material for forming the support sheet.
• the synthetic fibrous material may be made of a member selected from the group consisting of polyalpha-olefin comprising at least one alpha-olefin monomer, a copolymer comprising at least one alpha-olefin monomer and at least one other copolymerizable monomer, and a mixture of a alpha-olefin polymer or copolymer with another blendable polymer and mixtures of the foregoing.
• the synthetic fibrous material may be obtained by spinning a blended composition comprising at least one of alpha-olefin polymer or copolymer and at least one hydrophilic polymer.
• the hydrophilic polymer may be either a water soluble polymer or a copolymer of a vinyl monomer including a hydrophilic group. Alternatively, a hydrolized product of a copolymer of vinyl monomer which can take a hydrophilic group therein by hydrolysis is also useful.
• the hydrophilic polymer is polyvinyl alcohol and the alpha-olefin polymer may be preferably polypropylene.
• the synthetic fibrous material is obtained by emulsion flush spinning of a blended composition comprising polypropylene and polyvinyl alcohol.
• the synthetic fibrous material may also be obtained by spinning a composition comprising a copolymer of alpha-olefin polymer with a vinyl monomer having a hydrophilic group.
• a hydrolysis product of a copolymer of alpha-olefin polymer with a vinyl monomer which is capable of taking therein a hydrophilic group by hydrolysis may also be used for spinning.
• the synthetic fibrous material is synthetic fibers having a least 60% by weight of vinyl alcohol unit.
• the synthetic fibrous material may preferably be used in the support sheet in such an amount that the amount of the vinyl alcohol unit is at least by weight with respect to the total amount of the fibrous material.
• This type of synthetic fibrous material may be obtained by spinning a hydrolized vinyl acetate polymer or a hydrolized copolymer of vinyl acetate with a monomer copolymerizable therewith.
• a modified synthetic fibrous material is used for forming the support sheet for the pressure sensitive recording system.
• the modified synthetic fibrous material may be obtained by carrying out the polymerization of at least one vinyl monomer on or in natural cellulose fibers.
• the modified synthetic material may also be obtained by depositing a polymer or copolymer comprising at least alpha-olefin monomer on natural cellulose fibers or synthetic fibers.
• K is the coefficient of oil penetration rate by cm/min
• the above defined coefficient of oil penetration rate may be measured at a temperature of 25C, at a humidity of RH and under the atmospheric pressure of 760mmHg.
• the above defined coefficient of oil penetration rate may be measured by the following steps:
• the coefficient of oil penetration rate as defined in the above can be reduced by utilizing certain synthetic fibers as a fibrous material for the support sheet.
• the coefficient of tetralin penetration rate of the support sheet must be recuced to 600 X 10- cmlrnin or less.
• the support sheet for the pressure sensitive recording sheet according to the invention is made of a fibrous material comprising a mixture of natural cellulose fibers with synthetic fibers, although the whole support sheet may be made of synthetic fibers alone.
• the synthetic fibers used according to the invention have a specific surface area of at least 0.7 m /g.
• the pressure sensitive recording paper utilizing a synthetic fiber support sheet according to the invention is superior in the effect of preventing the smudge to the known pressure sensitive recording paper utilizing a natural fiber support sheet.
• the pressure sensitive recording paper has various improved proportions, especially, in brightness, opacity and dimensional stability against humidity such as expansion or contraction resistivity and curl resistivity. Further, according to the invention, it is possible to reduce the weight of the pressure sensitive recording paper beyond the limit which could ever be reached with the conventional pressure sensitive recording paper utilizing a natural fiber support sheet.
• Useful synthetic fibers for the present invention can be selected from wide and various groups of polymers.
• polyolefinic synthetic fibers including 50% by weight of alphaolefin unit are used for forming the support sheet.
• polymers for polyolefinic fibers there may be included homo polymers such as polyethylen, polypropylene, poly-l-butene and poly-4-methyl-l-pentene, binary or ternary copolymers from alpha-olefin such as poly-(ethylene-propylene), binary or ternary copolymers comprising alpha-olefin and at least one other monomer copolymerizable with alpha-olefin, and graft copolymers or cross-linked products of the foregoing polymers.
• These synthetic resin materials may be spun by any of flush spinning, uniaxial stretching and splitting, solution shearing, emulsion flush spinning and centrifugal spinning to produce fibrous materials. Mixtures of the above mentioned polymers with each other and mixtures of those polymers with other polymers may also be used for spinning to obtain fibrous materials.
• synthetic fibers of poly-alphaolefin having a hydrophilic component are used.
• the spinning material for those synthetic fibers consists essentially of alpha-olefin homopolymers such as polypropylene, polyethylene, and poly-4-methylpentene-l or a copolymer produced from a mixture including at least one alpha-olefin, and of hydrophilic or water-soluble polymer component which is incorporated to the spinning material by polymer blend and/or graft-copolymerization.
• hydrophilic or water-soluble polymer comporient to be incorporated there may be included water-soluble polymers such as polyvinyl alcohol, polyacrylamide, polyethylene oxide, polyethylene glycol and carboximethyl cellulose, random, graft or block copolymers having vinyl monomer unit having a hydrophilic radical in themselves or vinyl monomer units to which hydrophilic radical can be introduced by aftertreatment such as hydrolysis.
• the said hydrophilic polymer includes as well copolymers of alpha-olefin with a vinyl monomer having a hydrophylic radical in itself or a vinyl monomer to which a hydrohilic radical can be introduced by proper after-treatment.
• the monomers to be introduced to polyalpha-olefin by graft polymerization there are includee vinyl monomers having a hydroxyl group and/or a carboxyl group and vinyl monomers which can have a hydroxyl group or a carboxyl group by such a treatment as hydrolysis.
• vinyl acetate acrylic acid, methacrylic acid, methylacrylate, methylmethacrylate, allyl alcohol and butenetricarboxylic acid.
• the graft polymerization product may also include any other monomer which is capable of graft copolymerization with the above mentioned vinyl monomers.
• such monomers as acrylonitrile, vinylchloride, methylmethacrylate, acrylamide may be used in an amount less than that of the above mentioned vinyl monomer to produce a copolymerization product.
• the above mentioned polymers may be spun by vari ous spinning techniques to produce fibrous material.
• a material compound obtained by incorporating a hydrophilic component to the above mentioned alpha-olefin polymer or copolymer by blend and/or graft polymerization is dissolved in a proper solvent such as hydrocarbons or chlorinated hydrocarbons.
• the solution thus obtained is then added to a non-solvent with a surface active agent to produce an emulsion.
• the fibrous material is obtained from the emulsion thus prepared by the emulsion flush spinning technique.
• the fibrous material obtained by the emulsion flush spinning may be subjected to beating and/or refining, if required.
• the fibrous material thus obtained is easy to be fibrillated, has a relatively high specific surface area, is good in oil absorption and dispersive to water.
• the poly-alpha-olefin fibers having a hydrophilic component there may be included, as one of the most practically useful materials, the synthetic fibrous material which is obtained by spinning through the utilization of the emulsion flush spinning technique the mixture of to 99% by weight of poly-alpha-olefin polymer or copolymer with 50 to 1% by weight of polyvinyl alcohol.
• the fibrous material thus obtained may be subjected to a beating treatment, if required.
• the whole support sheet for the pressure sensitive recording system can be formed of the synthetic fibers essentially comprising poly-alpha-olefin without any other fibrous material. It is however also possible to form the sheet of a mixture of the above mentioned synthetic fibers with wood pulp. Any conventional paper manufacturing machine may be used. In addition to the fibrous materials inorganic fillers, sizing agents, defoaming agents, dyes and adhesives may also be used as various additives. It is desirable that the amount of alpha-olefin unit is at least 4% by weight with respect to the total amount of the fibrous material for forming the support sheet.
• the fibrous material which is used for forming the support sheet including by weight of vinyl alcohol unit.
• the polyvinyl alcohol resin as the spinning material may be obtained by hydrolizing a homo polymer of vinyl acetate or copolymer of a vinyl acetate monomer with a copolymerizable monomer such as vinyl chloride, acrylic ester or methacrylic ester.
• the spinning material comprising polyvinyl alcohol which may contain other water-soluble polymeric material such as starch, casein, cellulose derivatives, polyacrylic acid and etc. may be transformed by any conventional spinning technique to produce fibrous material.
• the fibrous material may be subjected to a beating treatment for fibrillation.
• the support sheet manufactured utilizing this fibrous material includes 15% by weight of vinyl alcohol unit.
• modified fibrous materials there may be modified synthetic fibrous materials.
• the modified fibrous material according to the invention may be manufactured by carrying out on or in natural cellulose fibers the polymarization of at least one vinyl monomer selected from the group consisting of vinyl acetate, acrylic acid,- acrylic ester, acryl amide, methacrylic acid, methacrylic ester and methacrylamide.
• the modified fibrous material may be obtained by depositing on natural or synthetic fibers a polymer comprising at least one alpha-olefin, its copolymer or a mixture thereof.
• the amount of the polymer component in the fibrous material may preferably be at least 3% by weight with respect to the total amount of the fibrous material.
• the modified fibrous material may be fibrillated by a beating treatment, if required.
• the polymerization for producing the modified fibrous material is preferably be carried out by the solution polymerization technique, though any other polymerization techniques such as emulsion polymerization and suspension polymerization may also be utilized. The latter cases are disadvantageous in the fact that monomers are easily separated from the natural cellulose fibers.
• the most preferred one among the above mentioned three embodiments is the first one. Especially, polyalpha-olefin fibers obtained by the emulsion flush spin ning technique would be the best.
• the support sheet having a coefficient of oil penetration rate below the upper limit is formed of various synthetic fibers alone or of a mixture of synthetic fibers with other fibrous materials including natural cellulose fibers.
• the formation of the sheet may be carried out either wet or dry sheet forming technique.
• any conventional additives such as inorganic fillers, sizing agents, defoaming agents, adhesive may be used.
• the support sheet may be subjected to surface sizing treatment, calendering treatment and any other treatments.
• the fibrous materials which may be used together with synthetic fibers there are included natural cellulose fibers such as wood pulp, bamboo pulp, straw pulp and linen fibers and etc. Preferably, bleached wood pulp is most economically used.
• the synthetic fibers used for forming the support sheet for the pressure sensitive record system according to the invention have a specific surface area of at least 0.7m /g. This is important to obtain a support sheet having an improved brightness and a sufficient opacity.
• S,, is the specific surface area (cm /g), f is a space rate of a sample filling layer (a fiber pad),
• r is the specific gravity (g/cm) of the fibrous material
• Y is the coefficient of viscosity of air (g/cm sec)
• L is the thickness of the fiber pad (cm)
• Q is the volume (cm of air passing through the fiber Agis the pressure drop (g /cm between the opposite ends of the fiber pad,
• A is a cross sectional area (cm through which air passes
• t is the time (sec) required for the passing of air of Q cm through the sample layer
• W is the weight (g) of the fiber pad and A is a cross sectional area (cm of the fiber pad.
• A is a cross sectional area (cm of the fiber pad.
• the specific surface area of each of various samples has been calculated from the above formula after measuring the airpremeability of each of the samples at 20C and at RH.
• the samples have been shaped in the form of pads, made of various fibrous materials.
• LBKP bleacheched hard wood kraft pulp
• NBKP bleacheched soft wood kraft pulp
• CSF 400 cc wood pulp suspension
• 150 parts of powdered polypropylene was dissolved in 1000 parts of methylene dichloride in an autoclave.
• I900 parts of aqueous solution containing 10 parts of polyvinyl alcohol was added with 5 parts of sodium dodecylbenzenesulfonate. The said mixture solution was stirred to obtain the heated emulsion.
• each paper sheet was coated with the capsular suspension by 5 g/m on dry basis.
• the preparation of the capsular suspension is as follows.
• the other surface of the paper sheets was respectively coated by 8g/m on dry basis with a coating color comprising 200 parts of Water, 100 parts of active clay as acceptor, and 30 parts of styrene butadiene latex(as 50% total solid).
• Yellow ink was applied onto the acceptor-coated side of the pressure-sensitive recording paper obtained by letter press. After such ink was dried the said pressuresensitive recording paper were placed one after in such a way that the capsule coated side and the acceptor coated side are in contact with each other. After the obtained set of pressure-sensitive recording paper was allowed to stand under the pressure of g/cm for 10 days, the smudge on the acceptor-coated surface was examined. The result is shown in the attached table.
• Example 1 the property test of support sheet and pressure-sensitive recording paper was carried out in the same manner as in Example 1, and the producing method of pressure-sensitive recording paper was also the same as that of Example 1.
• EXAMPLE 2 A blended polymer composition consisting of 15% of partially saponified polyvinyl acetate and 85% isotactic polypropylene having melt flow index of 8 was extruded, and the obtained film was drawn 14 times in 10 refined in a laboratory Niagara Beater for 3 hours with 4 gram of nonionic surface active agent and 25 l of water to produce a split fiber (C) with length of 1.0 2.0 mm and width of 10 30 microns. The specific surface area of the said fiber was 0.89 m /g.
• the obtained polypropylene split fiber (C) was mixed with the wood pulp suspension (A) used in Example l in the blending ratio (A)/(C) of /15, 75/25 and 65/35 on the basis of dry weight to obtain pulp suspensions.
• the pulp suspensions were respectively applied to TAPPI Sheet Machine to obtain support sheets (c-l, c-2, and c-3) of 4Og/m on dry basis.
• a split fiber (D) was produced from a melt of isotactic polypropylene in the same manner as above. Length, width adn specific surface area of the obtained split fiber (D) were respectively 1.0 2.5mm, l0 40 microns and 0.64 m /g. Furthermore, a melt of the above isotactic polypropylene having melt flow index of 8 was spun. After the extrusion was taken into the water for cooling, the said extrusion was drawn 10 times with three rolls in C water bath to produce a filament of 3 denier. The filament was cut into 3 mm in length. The specific surface area of the obtained fibrous material (E) was 0.35 m /g.
• the obtained fibrous material (D) and (E) were respectively mixed with the wood pulp suspension (A) in the blending ratio above to obtain paper sheets (d-l, d-2, d-3; e-l, e-2, e-3). Each sheet obtained above and pressure-sensitive recording paper produced with use of the said sheet were tested and the results are shown in the attached table.
• EXAMPLE 3 130 parts of powdered polyethylene and 420 parts of hexane were placed in an autoclave and were heated to 200C with stirring to produce a solution. The solution was flushed out from a nozzle under the pressure of 60 kg/cm G to produce a fibrous material which was subsequently refined to have the specific surface area of 2.0m /g.
• the obtained fibrous material (F) was then mixed with the wood pulp suspension (A) used in Example 1 in the blending ratio (A)/(F) of 50/50, 20/80 and 0/100 on the basis of dry weight to obtain pulp suspensions.
• the obtained pulp suspensions were respectively applied to TAPPI Sheet Machine to produce paper sheets (f-l, f-2, f-3) of 40 g/m on the dry basis. Each sheet obtained above and the pressure-sensitive recording paper produced with use of the said sheet were tested and the results are shown in the attached table.
• EXAMPLE 5 An aqueous solution containing 14% polyvinyl alcohol (PVA) having average polymerization degree of 1500 and 30% starch on PVA was spun and drawn by 250% with roller in an aqueous solution (50C) saturated with sodium sulfate. Consequently the second drawing by 60% was carried out in a solution (80C) saturated with sodium sulfate. After drying the drawn fiber, the third drawing by 60% was carried out in the air of 225C and the heat-setting was carried out without any draft.
• PVA polyvinyl alcohol
• the above-obtained fiber of 1 denier was cut into 3 mm in length and refined by PFl mill to obtain fibrous material (H) having the specific surface area of 2.1 m /g.
• fibrous material (H) was mixed with the wood pulp suspension (A) used in Example 1 in the blending ratio (A)/(1-1) of 80/20 and 65/35.
• the obtained pulp suspensions were respectively applied to TAPPl Sheet Machine to produce paper sheet (h-l,
• EXAMPLE 6 Polyethylene emulsion was added to the aqueous suspension of LBKP (CSF 465 cc) with a proper amount of aluminum sulfate to deposit on the surface of LBKP. The amount of deposited polyethylene was nearly equivalent on dry basis to that of the pulp suspension.
• the specific surface area of the obtained modified fibrous materials (1) was l.6m /g.
• Paper sheets (i) of 40 g/m on dry basis were produced form the modified fibrous material above in the same manner as in Example 1. The sheet thus obtained and the pressure-sensitive recording paper produced with use of the said sheet were tested and the results are shown in the attached table.
• EXAMPLE 7 Modified fibrous material (J) was produced in the same manner as in Example 6 except that acryl fibers (CSF 300 cc) was used instead of LBKP. The specific surface area of the said fibrous material was 2.0 mlg. Paper sheets of 40 g/m on dry basis were produced from the above-obtained fibrous material in the same manner as in Example 1. Sheet thus obtained and the pressure-sensitive recording paper produced with use of the said sheet are tested and the results are shown in the attached table.
• acryl fibers CSF 300 cc
• a pressure sensitive recording paper comprising a support sheet having, disposed on at least one of the surfaces thereof, at least one color producing reactant selected from the group consisting of a colorless dye material which is dissolved in an oil and contained in microcapsules and a color acceptor reactive with said colorless dye material to produce a color image, said support sheet comprising fibrous material, at least a part of which is synthetic fibrous material, said synthetic fibrous material being selected from the group consisting of (l synthetic fibers made of an alpha-olefin polymer or copolymer; (2) synthetic fibers made of a mixture of an alpha-olefin polymer or copolymer with another blendable polymer; (3) synthetic fibers having at least 60% by weight of vinyl alcohol unit; (4) modified synthetic fibers obtained bycarrying out polymerization of at least vinyl monomer on or in natural cellulose fibers; and (5) modified synthetic fibers obtained by depositing an alpha-olefin polymer or copolymer on natural or synthetic fibers, and said support sheet having a coefficient
• h(cm) K VT) wherein h is a length by cm of tetralin penetration and z is time by minute.
• a pressure sensitive recording paper as defined in claim 5 in which the synthetic fibrous material is used in said support sheet in such an amount that the amount of said alpha-olefin unit of said synthetic fibrous material is at least 4% by weight with respect to the total amount of the fibrous material forming said support sheet.
• hydrophilic polymer is a member selected from the group consisting of a water soluble polymer, a copolymer of vinyl monomer including a hydrophilic group and a hydrolized copolymer of vinyl monomer which can take a hydrophilic group therein by hydrolysis.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Color Printing (AREA)
• Paper (AREA)

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Citations (5)

• 1972
  • 1972-07-22 JP JP7352472A patent/JPS5428766B2/ja not_active Expired
• 1973
  • 1973-07-18 CA CA176,744A patent/CA1011186A/en not_active Expired
  • 1973-07-19 US US380662A patent/US3922463A/en not_active Expired - Lifetime
  • 1973-07-20 FR FR7326756A patent/FR2194159A5/fr not_active Expired
  • 1973-07-20 CH CH1068173A patent/CH573313A5/xx not_active IP Right Cessation
  • 1973-07-20 FI FI2291/73A patent/FI57152C/fi active
  • 1973-07-20 DE DE2336997A patent/DE2336997C3/de not_active Expired
  • 1973-07-20 BE BE133708A patent/BE802613A/xx not_active IP Right Cessation
  • 1973-07-23 NL NL7310221A patent/NL7310221A/xx not_active Application Discontinuation
  • 1973-07-23 GB GB3497473A patent/GB1435016A/en not_active Expired
  • 1973-07-23 IT IT26919/73A patent/IT998274B/it active

Patent Citations (5)

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