FI57152C - PAPPERSMATERIAL FOER TRYCKKAENSLIGT KOPIERINGSSYSTEM - Google Patents

Description

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Japan ^ Japan (JP) 7352U / 72, (71) Toray Industries, Inc., Tokyo, Japan-Japan (jp) (72) Takashi Masaoka, Amagasaki, Hyogo, Noritoshi Watanabe, Takatsuki,

This invention relates to a pressure-sensitive storage system, and to the present invention, and to the present invention relates to a pressurized storage system. paper material for a pressure sensitive storage system.

A variety of pressure-sensitive recording systems are known that utilize an electronic donor-receiver color-forming reaction between a colorless dye and a color-forming reactive acid. Hereinafter, in this specification, a colorless dye is referred to as a color former and a color-forming reactant is referred to as a color acceptor. These pressure-sensitive recording systems comprise a backing or backing sheet having microcapsules containing oil droplets in which the color former is dissolved and / or the color recipient is capable of producing color when reacted with the color former.

For example, U.S. Patent No. 2,730,456 discloses a transfer-copy system in which small oil droplets in which a color former is dispersed or dissolved are encapsulated and applied to the surface of a transfer sheet. The color former is then transferred to the receiving sheet by remembering said capsules. The receiving sheet below has a dye precursor coating that contains a dye receiver that will react with the dye former, providing a visible mark at the points where the microcapsules have ruptured and to which the dye former has moved. In the event that multiple copies are required, at least one intermediate copy sheet having said microcapsules and said color receiver on its opposite surface is arranged between the upper and lower copy sheets.

U.S. Patent No. 2,730,457 discloses another type of pressure sensitive winter release sheet. Both the color receiver and the capsules containing the oil droplets, in which the color former is dissolved, are arranged on the other surface of this pressure-sensitive recording sheet. This storage medium is known as an "independent system".

Suitable color formers include crystalline violet lactone, benzoyl leukomethylene blue, malachite green lactone, rhodamine lactone, fluorine derivatives, spiropyran, mixtures thereof, and the like.

Among the solvent oils for dissolving the above-mentioned color formers, mention may be made of non-volatile oils, for example alkylplinaphthalene, alkylbiphenyl, diarylmethane, triphenyl derivatives, dibenzylbenzene, liquid paraffin, castor oil, olive oil, rapeseed oil and cottonseed oil.

Among the color recipients, inorganic compounds are known, for example, acid clay, activated clay, bentonite, kaolin, zinc oxide, zinc hydroxide, zinc carbonate, etc., and organic compounds, for example, aromatic carboxylic acids, , phenols, phenolic polymers, multivalent metal salts of phenolic polymers, mixtures thereof, etc.

Natural fiber papers have been used in practice as the base sheet material for the above-mentioned pressure-sensitive storage systems, due to their easy processing and economic availability. Because it is desirable to reduce the weight or thickness of the paper for many copies, light papers weighing about 30 to 50 g / m 2 have been used. Pressure sensitive recording paper using such a lightweight base sheet has drawbacks which are unavoidable. For example, accidental rupture of microcapsules during storage or transport of products will cause so-called staining on the opposite surface of the recording paper or other layered sheet because the oil containing the color former penetrates the backing sheet and the color former reacts with or against the color recipient. on the surface of the layered second sheet. The lower the P9i-no of the paper, the lower the whiteness and opacity of the paper. As a result, the tint of the color image decreases and the color image will appear through the sheet on the opposite side. In addition, the lower the weight of the paper, the more sensitive the paper is to moisture.

3,571 52 This will cause the paper to curl due to the expansion and contraction of the paper. Paper curling or wrinkling is disadvantageous in the manufacturing steps of pressure sensitive recording papers, especially in the coating and winding stages, as well as in practical use.

The main object of the present invention is to provide an improved paper supply for a pressure-sensitive recording system which does not suffer from the disadvantages mentioned above. It is a particular object of the invention to provide an improved paper material for a pressure sensitive storage system which avoids staining caused by the storage and transport of products.

Another object of the invention is to provide an improved paper material for a pressure sensitive recording system with good whiteness and opacity.

It is a further object of the invention to provide an improved paper material for a pressure sensitive storage system which has improved shape resistance to moisture.

Yet another object of the invention is to provide an improved paper material for a pressure sensitive storage system that is relatively light in addition to the aforementioned advantages.

Other objects and advantages of the invention will become more apparent from the following description.

The paper material for the pressure sensitive recording system of the invention comprises a backing sheet having at least one surface coated with at least one color-forming reactant selected from the group consisting of a color former dissolved in oil and containing microcapsules and a color receiver reacting with said color-forming reagent. with a color generator to create a color image. The base sheet is made of fibrous material. Part of the fibrous material is man-made fiber. The penetration coefficient of the tetralin base sheet is 600 x 10 "^ cm / min ^^ or less. The penetration of tetralin is denoted by K in the following formula: h (cm) 'where h is the penetration length of the tetralin in centimeters and t the time in minutes.

In a preferred embodiment of the invention, the synthetic fiber used has a specific surface area of at least 0.7 cm 2 / fc.

Preferably, your man-made fiber contains at least 50% by weight of alpha-olefin. Suitably, the man-made fiber material may be used in the backing sheet in an amount such that the amount of alpha-olefin portion of the man-made fiber material is at least 4 57152% by weight of the total amount of fiber to form the backing sheet. The synthetic fiber may be made from the group consisting of a polyalphaolefin comprising at least one alpha-olefin monomer and at least one other copolymerizable monomer and a mixture of alpha-olefin polymer or copolymer and another miscible polymer, or mixtures thereof.

The man-made fiber can be obtained by spinning a blended composition comprising at least one alpha-plephin 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 containing a hydrophilic group. Alternatively, a hydrolyzed product of a vinyl monomer copolymer to which a hydrophilic group is obtained by hydrolysis is also useful. A typical hydrophilic polymer is polyvinyl alcohol and the alpha-olefin polymer may suitably be polypropylene. In a highly preferred embodiment of the invention, the man-made fiber is obtained by emulsion spray spinning of a blended mixture containing polypropylene and polyvinyl alcohol.

The man-made fiber can also be obtained by spinning a mixture containing a copolymer of an alpha-olefin polymer and a vinyl monomer containing a hydrophilic group. A hydrolysis product of a copolymer of an alpha-olefin polymer and a vinyl monomer capable of receiving a hydrophilic group by hydrolysis can also be used for spinning.

According to another embodiment of the invention, the man-made fiber material contains at least 60% by weight of vinyl alcohol fibers. Preferably, the man-made fiber material may be used in the backing sheet in an amount such that the amount of vinyl alcohol is at least 15% by weight of the total amount of fiber material. This type of man-made fiber can be obtained by spinning a hydrolyzed vinyl acetate polymer or a hydrolyzable copolymer of vinyl acetate and a monomer copolymerizable therewith.

According to a preferred embodiment of the invention, a modified man-made fiber material is used to form a region sheet for a pressure-sensitive recording system. The modified man-made fiber can be obtained: by polymerizing at least one vinyl monomer into natural cellulosic fibers. The homodified man-made fiber material can also be obtained by depositing a polymer or copolymer containing at least alpha-olefin on the surface of natural cellulose fibers or man-made fibers.

Detailed description of the invention.

After considerable research and experimentation, we have found that the oil penetration rate of the base sheet oil is an important factor in so-called staining, and if the oil penetration rate of the base sheet oil can be flown, the pressure sensitive recording sheet can be prevented from staining the oil-containing dye. We suggest using the oil penetration coefficient as the oil penetration rate index, denoted by the letter E in the following formula: h »K V t where h is the oil penetration length in centimeters per sheet of test paper, t is the time in minutes and K is the oil penetration rate in cm / min.

The oil penetration rate factor defined above can be measured at 25 ° C, 55% relative humidity and 760 mmHg.

In practice, the oil penetration rate factor defined above can be measured by the following steps: 1) A test paper strip with a zero line mark is prepared, 2) the test paper strip is held vertically, 3) the lower end of the test paper strip is contacted with tetralin (1,2,3 »4-tetrahydronaphthylene) ) measure the heights of the tetralin or the distances on the test paper strip from the zero line at regular intervals.

It has been found that the oil penetration rate coefficient of commercially available natural fibrous paper can be reduced by the grinding treatment, and the stronger the grinding, the lower the K value of the ground paper.

However, since the grinding treatment means, in particular, a significant reduction in both whiteness and opacity of natural fibrous paper weighing about 30-50 g / m 2, the above-mentioned problems cannot be solved by applying the grinding treatment to natural fibrous paper.

After further investigation, it has been found that the oil penetration rate coefficient as defined above can be reduced by using certain man-made fibers as the fibrous material of the base sheet. To achieve the objects of the invention, the tetralin penetration rate coefficient of the base sheet must be reduced to 600 x 10 "^ cm / min ^ 2 or less in the brain.

Preferably, the backing sheet for the pressure sensitive recording sheet according to the invention is made of a fibrous material containing a mixture of natural cellulose fibers and man-made fibers, although the whole backing sheet can be made exclusively of man-made fibers. Most preferably, the synthetic fibers used according to the invention have a specific surface area of at least 0.7 m / g.

A pressure-sensitive recording paper using a synthetic fiber backing sheet according to the invention is extremely effective in preventing staining compared to the known pressure-sensitive winter recording paper using a natural fiber backing sheet. In addition, pressure-sensitive tracing paper has various improved properties, especially whiteness and opacity, as well as shape resistance to moisture, such as expansion or shrinkage resistance and curl resistance. In addition, according to the invention, it is possible to reduce the weight of the pressure-sensitive recording paper below a limit which can never be achieved with ordinary pressure-sensitive recording paper using a natural fiber backing sheet.

It can be seen that the improved effects and advantages obtained according to the invention are due to the structure, the affinity for the oil, the swelling property provided by the oil and the various chemical properties of the man-made fibers to melt simultaneously and independently. In some or many cases, many suitable treatments, such as the addition of fillers, gluing, and calendering, will effectively increase the aforementioned effects. In any case, it should be noted that the penetration rate coefficient of the base sheet tetralin must not exceed 600 x 10 "^ cm / min ^^. the criticality of the oil penetration rate coefficient will become apparent from the following examples of the invention.

The man-made fibers useful in this invention can be selected from a wide variety of polymer groups.

According to a preferred embodiment of the invention, polyolefin man-made fibers containing 50% by weight of alpha-olefin are used to form the base sheet. Polymers for polyolefin fibers may include homopolymers, for example polyethylene, polypropylene, poly-1-hutene and poly-4-methyl-1-pentene, copolymers of two or three substances derived from alpha-olefin, for example poly (ethylene propylene), copolymers of two or three substances containing an alpha-olefin and at least one other monomer polymerizable with an alpha-olefin and graft copolymers or crosslinking products of the aforementioned polymers. These synthetic resins can be spun uniaxially by any spin-spinning method, stretching and segmenting, emulsion spraying, and a centrifugal method to obtain fibrous materials. Mixtures of the above polymers with another polymer and mixtures of these polymers with other polymers can also be used in spinning to provide fibrous materials.

Artificial fibers of poly-alpha-olefin containing a hydrophilic component are most suitable. The spinneret for these man-made fibers 7 57152 contains substantially homopolymers of alpha-olefin, for example polypropylene, polyethylene and poly-4-methyl-pentene-1 or a copolymer made from a mixture of at least one alpha-olefin and a polymer component derived from a hydrophilic or water-soluble polymer. is combined with the spinning material by blend polymerization and / or graft copolymerization. The hydrophilic or water-soluble polymer component to be combined may include polyvinyl alcohol, polyacrylamide, polyethylene oxide, polyethylene glycol and carboxymethylcellulose, and mixed, graft or block copolymers may be by hydrolysis. Said hydrophilic polymer also comprises copolymers of alpha-olefin with a vinyl monomer which itself has a hydrophilic group or with a vinyl monomer to which the hydrophilic x group can be introduced by a suitable post-treatment. Vinyl monomers having a hydrophilic group or to which a hydrophilic group may be introduced by suitable post-treatment may include vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, acrylamide, allyl alcohol and butene tricarboxylic acid.

Monomers to be attached to the polyalphaolefin by graft polymerization include vinyl monomers having a hydroxyl group and / or a carboxyl group or vinyl monomers having a hydroxyl group or a carboxyl group, which groups can be attached, for example, by hydrolysis. Examples which may be mentioned are vinyl acetate, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, allyl alcohol and butene-tricarboxylic acid. acrylonitrile, vinyl chloride, methyl methacrylate and acrylamide, which can be used in a smaller amount than the above-mentioned vinyl monomer to prepare a copolymer product.

The above polymers can be spun by various spinning methods to produce a fibrous material. For example, a compound obtained by combining a hydrophilic component with the above-mentioned alpha-olefin polymer or copolymer by blend and / or graft polymerization is dissolved in a suitable solvent, for example hydrocarbons or cloned hydrocarbons. The solution thus obtained is then added to a non-solvent with a surfactant to form an emulsion. The fibrous material is obtained from the emulsion by the spray-spinning method 57152. The fibrous material obtained by ion sputtering spinning is ground and / or processed, if necessary.

The fibrous material thus obtained is easily fibrous, has a relatively large specific surface area, absorbs oil well and disperses in water. Polyalphaolefin fibers containing a hydrophilic component may include, as one of the highly preferred materials, synthetic fiber material obtained by spinning using an emulsion spinning method a mixture containing 50 to 99 weight percent of a polyalphaolefin polymer or copolymer and 50 to 1 weight percent of a polyvinyl alcohol. If necessary, the fibrous material thus obtained can be subjected to a grinding treatment.

The entire backing sheet for a pressure sensitive storage system can be formed of man-made fibers that substantially contain polyalphaolefin without any other fibrous material. However, it is also possible to form a sheet from a mixture containing the above-mentioned man-made fibers together with wood pulp. In this case, any ordinary paper machine can be used. In addition, inorganic fillers, adhesives, antifoams and colorants can be added to the fibrous materials as various additives. It is desirable that the amount of alpha-olefin be at least 4% by weight of the total amount of fibrous material.

In another preferred embodiment of the invention, the fibrous material used to form the backing sheet contains 60 weight percent vinyl alcohol. The spinning polyvinyl alcohol resin can be obtained by hydrolyzing a homopolymer of vinyl acetate or a copolymer of vinyl acetate monomer with a polymerizable monomer such as vinyl chloride, acrylic ester or methacrylic ester. A spinning agent containing polyvinyl alcohol, which may also contain another water-soluble polymeric substance such as starch, casein, cellulose derivatives, polyacrylic acid, etc., can be converted into a fibrous substance by any conventional spinning method. This fibrous material can be ground for defibering. A backing sheet suitably made of this fibrous material contains 15% by weight of vinyl alcohol.

According to a further preferred embodiment of the invention, man-made fibers can be modified. According to the invention, the modified fibrous material can be prepared by polymerizing on natural cellulosic fibers or fibers at least one vinyl monomer selected from the group consisting of vinyl acetate, acrylic acid, acrylic ester, acrylamide, methacrylic acid, methacrylic ester, methacrylic ester. Alternatively, the modified fibrous material can be obtained by depositing on the surface of natural or man-made fibers a polymer containing at least one alpha-olefin, a copolymer thereof or a mixture thereof.

In the case of a modified fibrous material, the amount of the polymer component in the fibrous material may suitably be at least 5% by weight of the total amount of the fibrous material.

If necessary, the modified fibrous material can be defibered by grinding. The polymerization to produce the modified fibrous material is suitably carried out by a solution polymerization method, although other polymerization methods such as emulsion and suspension polymerization can also be used. In the latter cases, however, the disadvantage is that - the monomers are easily separated from the natural cellulose fibers.

The most preferred of the above three embodiments is the first. In particular, alpha-olefin fibers obtained by the emulsion spraying method are best.

As described above in detail, a base sheet with an oil penetration rate coefficient below the upper limit is formed exclusively of various man-made fibers or a mixture of man-made fibers and other fibrous materials such as natural cellulose fibers. Sheet formation can be performed with either wet or dry meo. according to the method. Any conventional additives such as inorganic fillers, adhesives and antifoams can be used to form the sheet. In addition, the base sheet can be subjected to a surface gluing treatment, a calendering treatment or any other treatment. Other fibrous materials used in conjunction with man-made fibers include natural cellulosic fibers such as wood, bamboo, straw and flax fibers, etc. Suitably, it is most preferred to use bleached wood pulp.

As already mentioned above and will be explained in detail in the following examples, it is desirable that the synthetic fibers forming the backing sheet o for the pressure sensitive storage system according to the invention have a specific surface area of at least 0.7 m / g. This is important to obtain a backing sheet with good whiteness and opacity.

The definition of the specific surface area is known per se and is given by the following formula: 6 »* τΊ ί ·· k - 11 ä, 't £ 1 - T ^ E- 10 571 52 where Sw is the specific surface area (cm2 / g, ό of the test fill layer) ( fiber pad) filling ratio, Ϋ is the specific gravity of the fibrous material (g / cm ^), Y is the viscosity coefficient of the air (g / cm sec), L is the thickness of the fiber pad (cm), Q is the volume of air passing through the fiber pad (αη ^), , Δρ is the pressure drop between opposite ends of the fiber pad (g / cm2), is the cross-sectional area, (cm) through which the air passes, t is the time (sec) required for Q cm 2 air to pass through the test bed, V is the fiber pad weight (g) and A2 is the cross-sectional area (cm2) of the fiber pad In the following examples, the specific surface area of each different specimen is calculated from the above formula after measuring the air permeability of each specimen at 20 ° C and 65% urethral humidity. pillow shaped and made of different fiber materials.

The following examples are intended to illustrate the invention without limiting it. Unless otherwise stated, parts are by weight.

Example 1 80 parts of bleached hardwood sulphate cellulose and 20 parts of bleached softwood sulphate cellulose were mixed together to form a wood pulp suspension A. Thus, 150 parts of powdered polypropylene were dissolved in 1000 parts of methylene dichloride in an autoclave. To 1900 parts of the obtained aqueous solution containing 10 parts of polyvinyl alcohol was added 5 parts of dodecylbenzenesulfonate. Said mixture solution was stirred to obtain a hot emulsion. When the temperature of the emulsion had risen to 140 ° C, it was sprayed out of the nozzle at the bottom of the autoclave. The product obtained resembled velvet aspen in appearance.

After stirring the product in a mixer for 20 minutes, a pulp suspension B was obtained in which the finely fiberized fibrous materials were uniformly dispersed. The specific surface area of said fibrous material was 19.5 m / g.

The above-mentioned mass suspensions A and B were mixed together in a mixing ratio A / B 93/7 »85/15, 65/35 and 0/100 based on dry weight. Paper sheets b-1, b-2, b-3, b-4- and b-5 with a dry weight of 0-40 g / cm were prepared on a TAEPI sheeting machine. On the other hand, a control sheet a with a dry weight of 40 g / m 3 was prepared from the pulp suspension A.

The penetration rate, whiteness, opacity and shape resistance to moisture (curling, expansion and shrinkage) of each test sheet were measured and the results are shown in the attached table. The other surface of each sheet of paper was coated with a capsule suspension used at 5 g / m dry weight. The preparation of the capsule suspension is shown below.

50 g of acid-treated gelatin was added to 4-70 g of water. The resulting mixture was heated to 60 ° C to provide a solution.

11 57152 On the other hand, 2 g of crystalline violet lactone and 1 g of benzoyl leukomethene were dissolved in 100 g of isopropylnaphthalene to obtain a solution. After heating to 60 ° C, the color oil solution was added to the gelatin solution. An emulsion was obtained in which the droplet size averaged 4-5 yU. Then 300 g of a 10% aqueous solution of gum arabic was added to said emulsion and then another 200 g of water were added. Acetic acid was then added to the resulting solution to adjust the pH to 4-4.5 and coacervates were allowed to deposit around said oil droplets. The coacervate gelled by cooling the suspension to 10 ° C. After 10 g of formaldehyde was added to the suspension, the resulting suspension was allowed to stand for 10 hours to age. Thus, a capsule suspension was prepared.

The other surface of the sheets of paper was coated with a dry weight of 8 g / m 2 with a coating color containing 200 parts of water, 100 parts of active clay as recipient and 30 parts of styrene-butadiene latex (50% of solids).

The yellow ink was applied to the surface coated by the recipient of the pressure-sensitive recording sheet obtained from the printing press. After the ink was dried, said pressure-sensitive recording paper was placed one after the other so that the capsule-coated side and the recipient-coated surface came into contact with each other.

2

When the pressure-sensitive recording paper group was allowed to be pressurized to 20 g / cm for 10 days, staining on the coated surface of the recipient was examined. The results are shown in the attached table.

"The test methods used in this invention are as follows:

Specific surface area: at 20 ° C, 60% relative humidity, with a gas permeameter (Shimadzu Seisakusho Ltd).

- Whiteness according to JIS P 8123 (Japan Industrial Standard).

Opaque according to JIS P 8138.

Moisture Expansion and Shrinkage: TAPPI Standard T 447 m-59I (Moisture Expansivity of Paper).

Curl rating: after 24 hours in humidity controlled air.

A: No curling B: Slight curling C: Curling

Di Significant curl

Assessment of staining of pressure-sensitive recording paper: A: No staining B: Minor staining 12 571 52 C: Severe staining

The above results of the study clearly show that a sheet made of a polyolefin-containing man-made fiber and spun by the emulsion spray spinning method was definitely the best at the same time in terms of smearing, opacity, whiteness, expansion, shrinkage and curling.

In the following examples, the property test of the base sheet and the pressure-sensitive recording paper was performed in the same manner as in Example 1, wherein the method of manufacturing the pressure-sensitive recording paper was similar to that of Example 1.

Example 2

The bleached polymer blend containing 15% partially saponified polyvinyl acetate and 85% isotactic polypropylene and having a melt flow index of 8 was extruded and the resulting film was drawn 14 times in a machine direction between two groups of rollers at an oven temperature of 130 ° C. A film with a thickness of 0.01 mm was obtained. The resulting film was cut to lengths of 10 mm. 259 g of said film were treated in a Niagara Beater laboratory apparatus for 5 hours with 4 g of nonionic surfactant and 25 liters of water to obtain fragmented fibers C having a length of 1.0-2.0 mm and a width of 10-50 microns. The specific surface area of said fibers was 0.89 m / g

The resulting polypropylene fibers were mixed with the pulp suspension used according to Example 1 in a mixing ratio of A / C 85/15, 75/25 and 65/35 on a dry weight basis to obtain pulp suspensions. The pulp suspensions were fed to a TAEPI sheeting machine to form base sheets c-1, c-2 and c-3 with a dry weight of 40 g / m 2.

On the other hand, for comparison with the above-mentioned sheets, the trimmed fibers D were made of isotactic polypropylene in the same manner as above. The length, width and specific surface area of the obtained fibers D were 1.0-2.5 mm, 10-40 microns and 0.64 m / g, respectively.

In addition, the above-mentioned isotactic polypropylene melt having a melt flow index of 8 was spun. For cooling, the extrudate obtained after siliconization in water was drawn 10 times by means of three rollers at 100 ° C in a water bath to produce 3 denier yarn. The wire was cut to lengths of 3 mm. The specific surface area of the obtained fibrous material E was 0.35 m 2 / g.

The obtained fibrous materials D and E were mixed with wood pulp pension A, respectively, in the above-mentioned mixing ratios to obtain paper sheets d-1, d-2, d-3 »e-1, e-2 and e-3. Each sheet 13 571 52 obtained above and the pressure-sensitive winter paper prepared using them were tested, and the results are shown in the attached table.

Example 5 130 parts of ground polyethylene and 4-20 parts of hexane were placed in an autoclave and heated to 200 ° C with stirring to form a solution. The solution was sprayed out through a nozzle at a pressure of 60 kg / cm to obtain a fibrous material G, which was then treated to a specific surface area of 2.0 m / g.

The obtained fibrous material E was then mixed with the wood pulp suspension A used in Example 1 in a mixing ratio of A / F of 30/30, 20/80 and 0/100 dry weight to obtain suspensions. The resulting pulp suspensions were fed to a TAPPI sheeting machine to quench sheets f-1, f-2 and f-3 with a dry weight of 40 g / m 2. Each sheet obtained above and the pressure-sensitive recording paper prepared using it were tested, and the results are shown in the attached table.

Example 4

An enulsion containing the chemicals listed below was sprayed in the same manner as in Example 1.

Chlorinated polypropylene 23 parts

Polypropylene 120 "

Polyethylene 30 "

Polyvinyl alcohol 18 "

Methylene dichloride 1000 "^ Water 1800"

Sodium dodecyl hensenesulfonate 5 "

The product, which resembled a velvet aspen, was diluted with water to a concentration of 25% and mixed in a mixer for 20 minutes to obtain a finely fiberized fibrous material G having a specific surface area of 7-1 m / g. in a mixing ratio of A / G 75/25) 50/30 and 25/75 to obtain a pulp suspension. Each pulp suspension was passed to a TAPPI sheeting machine to form sheets of paper g-1, g-2, and g-3 with a dry weight of 40 g / m 2.

Each sheet obtained above and the pressure-sensitive recording paper prepared using it were tested, and the results are shown in the attached table.

14 57152

Example 5

An aqueous solution containing 14% polyvinyl alcohol with an average degree of polymerization of 1500 and 30% starch was spun and drawn with a 250% roller into an aqueous solution (50 ° C) saturated with sodium sulfate. A second 60% draw was then performed on a solution (80 ° C) saturated with sodium sulfate. The third drawing of the thread was performed 60% in air at 225 ° C and the hot-curing was performed without any drawing.

The fiber with a denier of 1 obtained above was cut to lengths of 3 mm and ground in an FF1 mill to a fibrous material H having a specific surface area of 2.1 m 2 / g.

The fibrous substance H thus obtained was mixed with the wood pulp suspension A used in Example 1 in a mixing ratio of A / H 80/20 and 65/35. The resulting pulp suspensions were fed to a TAPPI sheeting machine to obtain sheets of paper h-1 and h-2 with a dry weight of 40 g / m 2. Each sheet thus obtained and the pressure-sensitive recording paper prepared using it were tested, and the results are shown in the attached table.

Example 6

The polyethylene emulsion was added to an aqueous suspension of bleached hardwood sulphate pulp containing a suitable amount of aluminum sulphate to deposit the emulsion on the cellulose silicon. The specific surface area I of the obtained fibrous materials I was 1.6 m / g. Paper sheets i having a dry weight of 40 g / m 2 were prepared from the modified fibrous material in the same manner as in Example 1. The sheets thus obtained and the pressure-sensitive winter papers prepared using them were tested, and the result is shown in the attached table.

Example 7

Modified fiber J was otherwise prepared in the same manner as in Example 6, except that acrylic fibers were used instead of sulfate-cellulose fibers. The specific surface area of said fibrous material was 2.0 m / g. Sheets of paper having a dry weight of 40 g / m 2 were prepared from the fiber obtained above in the same manner as in Example 1. The sheets thus obtained and the pressure-sensitive recording papers prepared using them were tested, and the results are shown in the attached table.

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Claims (17)

1. Paper material for pressure-sensitive copying system, which copying paper consists of a base sheet, the at least one of which is coated with a color-responsive reagent selected from the group, to which is a colorless dye dissolved in oil and contains microcapsules and a dye receivers reacting with said colorless dye to produce a dye image, characterized in that said base sheet contains a fibrous substance which is at least partially composed of an artificial fibrous material whose specific surface area is at least 0.7 m / g. the penetration rate coefficient of tetralin of said base sheet is 600 x 10 6 cm / min or less, wherein the penetration rate coefficient of tetralin is denoted by K in the following formula: h (cm) - K ^ t (min) r which represents the length of the penetration of the tetralin in cm and t is the time in minute * 1. 2. Paper material according to claim 1, characterized in that said fibrous material contains synthetic fibrous material. Paper material according to claim 1, characterized in that said fibrous material contains a mixture of synthetic fiber and natural cellulose fiber. 4. A paper material according to claim 1, characterized in that said synthetic fiber material contains at least 50% by weight of alpha olefin. 5. Paper material according to claim 4, characterized in that the synthetic material is used in the base sheet in such amount that the amount of the alpha olefin in said synthetic fiber material constitutes at least 4% by weight of the total amount of the fibrous material forming said base sheet. 6. A paper material according to claim 4, characterized in that said synthetic fiber material is made from a member selected from the group belonging to polyalphaolefin containing at least one alpha-olefin monomer, copolymer containing at least one alpha-olefin monomer and ether monomer and ether. and a mixture of alpha olefin polymer or copolymer together with a miscible polymer and mixtures of the above. Paper material according to claim 6, characterized in that said synthetic fiber material is obtained by spinning the blended mixture containing at least one alpha-olefin polymer and at least one hydrophilic polymer. 8. A paper material according to claim 7 wherein said hydrophilic polymer is a member selected from the group to which a water-soluble polymer, a copolymer of a hydrophilic group containing vinyl monomer, and that the hydrolyzed copolymer of the vinyl monomer can take up a hydrophilic group with the aid of hydrolysis. 9. Paper material according to claim 8, characterized in that said hydrophilic polymer is a polyvinyl alcohol. 10. Paper material according to claim 7, characterized in that said alpha olefin polymer is polypropylene. 11. Paper material according to claim 7, characterized in that said synthetic fiber material is obtained by emulsion spinning of the mixed mixture containing polypropylene and polyvinyl alcohol. 12. Pressure-sensitive copy paper according to claim 6, characterized in that said synthetic fiber material is obtained by spinning a mixture containing a copolymer of alpha-olefin together with a vinyl monomer, which occupies a hydrophilic group? or an alpha olefin and vinyl monomer, which amplifies occupying a hydrophilic group with the aid of hydrolysis, a copolymer hydrolysis product. 1J. Paper material according to claim 1, characterized in that said synthetic fiber material consists of synthetic fibers which contain at least 60% by weight vinyl alcohol. Paper material according to claim 13, characterized in that synthetic fiber material is used in said primer sheet in such an amount that said vinyl alcohol amount of said synthetic fibrous material is at least 15% by weight of the total amount of fibrous material forming said primer sheet. 15. Paper material according to claim 13, characterized in that said synthetic fiber material is obtained by spinning a mixture containing a member selected from the group to which belongs a hydrolyzed vinyl acetate polymer and a hydrolyzed copolymer of vinyl acetate together with a the same copolymeric monomer. 16. Paper material according to claim 1, characterized in that said base sheet contains a fibrous material, at least part of which is a modified synthetic fibrous material, which is obtained.