JP7026950B2 - Transparent flexible sheet - Google Patents

Description

The present invention relates to a transparent flexible sheet having excellent visibility by see-through even when a coarse lattice-like structure for maintaining dimensional stability and strength is composited as a support, for example, a membrane structure building (pavilion exterior, museum). Main body materials for outdoor applications such as objects, museum objects), seat houses, gardening houses, and parts materials such as daylighting windows, as well as partitions, curtains, and equipment used for indoor applications such as electronic / electrical equipment factories, hospitals / research facilities, etc. In general industrial material sheets used for covers, bags, leisure sheets and other miscellaneous goods, even if a coarse grid structure is combined, visibility of the entire sheet is not significantly obstructed. Regarding a transparent flexible sheet with improved weather resistance (discoloration resistance).

A part of the exterior and interior of the pavilion and museum is designed as a three-dimensional frame structure, and the film or sheet is stretched and covered according to the shape of the three-dimensional frame. The sheet is used. However, when these films and sheets are used alone, they have the drawbacks that the film loosens or deforms due to factors such as wind pressure, snow cover, and temperature rise, and that the stretched film is particularly prone to tearing due to contact with sharp objects. Therefore, a fiber base material is required as a reinforcing material for maintaining dimensional stability and obtaining a breakage prevention effect. An example of such reinforcement is a translucency in which a non-colored olefin resin film is laminated on both sides of a polyester fiber plain woven coarse woven fabric (thread density 1 warp / 2 cm × 1 weft / 2 cm: void ratio 90%). There are 95% film materials (Patent Document 1: Example 1 and the like), but these are conspicuous when the polyester fiber plain weft coarse woven fabric is visually exposed, and depending on the application, it is an obtrusive existence that obstructs the view. rice field.

Therefore, the applicant applies an aromatic phosphoric acid ester compound to the entire surface of a base material made of glass fiber as a partition sheet material having high visibility and a fiber composite sheet for a light ceiling material that does not lower the light intensity of a light source. A glass fiber base material obtained by forming a resin-impregnated coating layer with a soft vinyl chloride resin composition and obtaining a difference in refractive index (JIS K7142) between the glass fiber and the soft vinyl chloride resin composition of 0.03 or less is a skeleton. A transparent composite sheet (Patent Document 2) that is inconspicuous in shape was examined. After that, the applicant applied for a transparent glass cloth sheet used for non-combustible building materials such as smoke-proof hanging walls. We examined a transparent composite sheet with excellent toughness. This is based on an adhesive-impregnated coated glass cloth obtained by impregnating and curing an adhesive component containing a specific non-aromatic triisocyanate compound and a binder resin on a glass cloth treated with a silane coupling agent, and both sides thereof. A transparent non-combustible sheet (Patent Document 3) provided with a transparent layer of a soft vinyl chloride resin having a refractive index (JIS K7142) in the range of 1.52 to 1.58 containing an aromatic phosphate ester compound.

Both the transparent composite sheet of Patent Document 2 and the transparent non-combustible sheet of Patent Document 3 have sufficient visibility by see-through by making the glass fiber base material (glass cloth) translucent. Depending on the observation angle, interference fringes may occur in the field of view through the glass fiber base material (glass cloth), or by containing a large amount of aromatic phosphate ester compound, the view through the sheet may become yellowish. It has the drawback of. Therefore, even if the techniques of Patent Document 2 and Patent Document 3 are applied to the sheet of Patent Document 1, the problem of yellowing the field of view through the sheet cannot be solved. Further, Patent Document 2 is used as an optical ceiling material, and Patent Document 3 is used as a non-combustible building material such as a smoke-proof hanging wall, both of which are used indoors. Although there is no problem, the heavy use of aromatic phosphate ester compounds in film structures for outdoor use may cause problems of yellowing and coloring. On the other hand, in the field of liquid crystal display devices, a lightweight and unbreakable transparent resin substrate containing glass cloth as a core material as a substitute material for a glass plate has been studied, and a prepreg made of a composite of glass cloth and epoxy resin (Patent Document 4) has been used. ing. By approximating the refractive indexes of each of these, the presence of the glass cloth disappears optically, resulting in an indistinguishable appearance. However, by using an epoxy resin cured product, the texture is extremely hard and the sheet is thick. Since it is plate-shaped in shape, it is essentially unsuitable for applications in industrial materials that require flexibility. Therefore, it is a transparent flexible sheet that can be used outdoors because it contains a fiber base material for dimensional stability and strength maintenance, and even if the fiber base material is compounded, it does not significantly obstruct the visibility, and the visibility of the entire sheet is improved. A transparent flexible sheet with improved weather resistance (discoloration resistance) is desired.

Japanese Unexamined Patent Publication No. 2002-046237 Japanese Unexamined Patent Publication No. 2010-052370 Japanese Unexamined Patent Publication No. 2014-076563 Japanese Unexamined Patent Publication No. 2005-225104

The present invention has been made in view of the above-mentioned conventional circumstances, and the subject thereof is a main body material and a daylighting window for outdoor applications such as membrane structure buildings (pavilion exterior, museum objects, museum objects), seat houses, and gardening houses. In general, industrial material sheets used for parts materials such as electronic / electrical equipment factories, partitions used for indoor applications such as hospitals / research facilities, curtains, equipment covers, and miscellaneous goods such as bags and leisure sheets. Even if a fiber base material (coarse grid-like structure) for dimensional stability and strength maintenance is combined, the presence of the fiber base material (coarse grid-like structure) does not significantly obstruct the visibility of the sheet. It is an object of the present invention to provide a transparent flexible sheet having weather resistance (discoloration resistance) with improved overall visibility.

As a result of repeated studies to solve the above problems, a transparent resin sheet is applied to the entire front surface and back surface of the coarse lattice structure using the coarse lattice structure composed of resin-processed multifilament threads as a substrate. The resin-processed multifilament thread is a laminated composite, and the multifilament thread is covered with 1) a vinyl chloride resin composition containing an aromatic phosphate ester compound, and the multifilament thread is covered with the multifilament thread. 2) The difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition is within 0.05, and 3) the thread of 1) is further filled. A transparent coating layer made of one or more selected from an epoxy resin, a styrene resin, and an acrylic resin is provided on the entire surface of the strip, and the refractive index between the transparent coating layer and the vinyl chloride resin composition (JIS K7142). ) It was found that when the difference is within 0.05, an industrial material sheet with improved visibility in the entire sheet can be obtained without the presence of the coarse lattice-like structure obstructing the visibility. We have completed the invention of a transparent flexible sheet with excellent weather resistance. By setting the difference in refraction (JIS K7142) between the multifilament and the vinyl chloride resin composition within 0.05 or making it the same, the existence of the multifilament is optically translucent to transparent. Further, a transparent coating layer made of one or more selected from epoxy-based resin, styrene-based resin, and acrylic-based resin is provided on the entire surface of the (semi) transparent 1) thread, and the transparent coating is provided. By keeping the difference in refraction (JIS K7142) between the layer and the vinyl chloride resin composition within 0.05, the transparency of the (semi) transparent 1) threads is maintained, and a transparent coating layer is provided. However, it does not cause a drawback that greatly impairs flexibility. Further, this transparent coating layer is a barrier layer for retaining the aromatic phosphate ester compound contained in the vinyl chloride resin composition in the resin-processed multifilament thread and preventing the aromatic phosphate ester compound from migrating and diffusing to the transparent resin sheet side. By doing so, it is possible to stably maintain the transparent effect of the resin-processed multifilament thread (coarse lattice-like structure) and to stably maintain the weather resistance (discoloration resistance) of the sheet.

In the transparent flexible sheet of the present invention, the cross-sectional shape of the resin-processed multifilament thread is elliptical or substantially rectangular with both ends arcuate, and the height-to-width ratio in this cross-sectional shape is 2: 3 to 1: 5. Is preferable. As a result, a large number of filaments are overlapped and aligned thinly and flatly, and the refraction between the multifilament and the vinyl chloride resin composition is maintained while maintaining sufficient strength and dimensional stability as a multifilament yarn. When the rate (JIS K7142) difference is within 0.05 or the same, the presence of the multifilament can be optically made more transparent and difficult to see.

In the transparent flexible sheet of the present invention, the multifilament constituting the resin-processed multifilament thread is one or more selected from glass fiber, polyester fiber, polyamide fiber, polypropylene fiber, vinylon fiber, and vinyl chloride fiber. Is preferable. In particular, resin-processed multifilament yarns made of glass fiber (particularly E glass: refractive index 1.55 to 1.56) are preferable.

In the transparent flexible sheet of the present invention, the coarse lattice-like structure is a woven fabric composed of 1) warp / multifilament yarn group and weft / multifilament yarn group, or 2) warp / multifilament yarn group. , And a triaxial woven fabric composed of 40 ° to 65 ° bias / multifilament yarns, or 3) warp / multifilament yarns, weft / multifilament yarns, and 40 ° to 65 ° bias / multi. Using any one of the four-screw woven fabrics composed of filament yarns as a base material, the vinyl chloride resin composition is coated and filled, and further, the epoxy resin, the styrene resin, and the acrylic are used. It is transparently coated with one or more kinds selected from the system resins, and the area per coarse lattice of the coarse lattice structure is in the range of 25 mm ² to 111 mm ² , and all the coarse grains contained therein. The grid areas are preferably approximately equal.

In the transparent flexible sheet of the present invention, the coarse lattice-like structure is a biaxial structure in which 4) warp / resin-processed multifilament threads and weft / resin-processed multifilament threads are fixed at warp / weft intersections. A net, or a triaxial net in which 5) warp / resin-processed multifilament threads and 40 ° to 65 ° bias / resin-processed multifilament threads are fixed at the warp / bias intersection, or 6) warp / resin. Select from a four-axis net in which a processed multifilament thread group, a weft / resin processed multifilament thread group, and a 40 ° to 65 ° bias / resin processed multifilament thread group are fixed at a warp / weft / bias intersection. The resin-processed multifilament thread was coated and filled with a vinyl chloride resin composition, and was further selected from the epoxy-based resin, the styrene-based resin, and the acrylic-based resin. It is preferable that the area per coarse lattice coated transparently by the seed or more is in the range of 100 mm ² to 2600 mm ² , and the areas of all the coarse lattices contained therein are substantially the same.

The transparent flexible sheet of the present invention is one in which the aromatic phosphate ester compound is selected from tricresyl phosphate, triphenyl phosphate, trixylenyl phosphate, cresyldiphenyl phosphate, and 2-ethylhexyldiphenyl phosphate. As described above, it is preferably 50 to 200% by mass with respect to the mass of the vinyl chloride resin in the vinyl chloride resin composition. In particular, when resin-processed multifilament threads made of glass fiber (for example, E glass: refractive index 1.55 to 1.56) are used in combination with these aromatic phosphate ester compounds, the difference in refractive index between them is 0. By setting the content to 05 or less, the presence of the coarse lattice-like structure can be made inconspicuous.

In the transparent flexible sheet of the present invention, the vinyl chloride resin composition further comprises epoxidized soybean oil, epoxidized linseed oil, epoxidized fatty acid butyl, epoxidized fatty acid 2-ethylhexyl, epoxidized hexahydrophthalate 2-ethylhexyl, and epoxy. It is preferable that one or more epoxy compounds selected from diepoxystearyl hexahydrophthalates are contained in an amount of 1 to 25% by mass based on the total amount of the aromatic phosphate ester compounds. By containing these epoxy compounds, the weather resistance (discoloration resistance) of the aromatic phosphoric acid ester compound contained as an essential component in the vinyl chloride resin composition can be improved.

In the transparent flexible sheet of the present invention, the transparent resin sheet is composed of a vinyl chloride resin and a soft vinyl chloride resin composition mainly composed of a plasticizer, and the plasticizer is a phthalic acid dialkyl ester, an isophthalic acid dialkyl ester, or a terephthalate. One or more selected from an acid dialkyl ester, a cyclohexanedicarboxylic acid dialkyl ester, and a cyclohexene dicarboxylic acid dialkyl ester, preferably in an amount of 35 to 100% by mass based on the mass of the vinyl chloride resin. By using these plasticizers as the main component, the weather resistance (discoloration resistance) of the transparent resin sheet can be stably maintained.

The transparent flexible sheet of the present invention has an acrylic resin, a urethane resin, an acrylic / silicon copolymer resin, a fluorine-based copolymer resin, and an acrylic resin on the surface (front side and / or back side) of the transparent resin sheet. An antifouling layer composed of one or more coating materials selected from a blend of a fluoropolymer resin, a urethane / silicon-based graft copolymer resin, and a urethane / fluoropolymer-based graft copolymer resin is provided. It is preferable to have. By attaching this antifouling layer, it is possible to keep the appearance beautiful by exhibiting easy wiping and removing properties such as soot and dust stains stably and continuously for a long period of time without impairing the visibility of the transparent flexible sheet of the present invention. And.

In the transparent flexible sheet of the present invention, nanoparticles made of an inorganic colloidal substance having a primary particle diameter of 3 nm to 150 nm are added to the outermost surface (front side and / or back side) of the transparent resin sheet to add water to the silane coupling agent. An antistatic antifouling layer is provided which is supported by a binder component containing a decomposition condensate, and the inorganic colloidal substance is a photocatalytic titanium oxide sol, a photocatalytic zinc oxide sol, a photocatalytic tin oxide sol, a titanium oxide sol, and the like. One or more selected from zinc oxide sol, tin oxide sol, silica sol, aluminum oxide sol, zirconium oxide sol, cerium oxide sol, and composite oxide (zinc oxide-antimonium pentoxide complex or tin oxide-antimonium pentoxide complex) sol. It is preferably a metal oxide of. The attachment of this antistatic antifouling layer suppresses the adhesion and accumulation of soot dust due to charging without impairing the visibility of the transparent flexible sheet of the present invention, and even if soot dust adheres, it can be easily wiped off and it rains. It is possible to keep the appearance beautiful by the self-cleaning effect of time.

The transparent flexible sheet obtained by the present invention uses a coarse lattice-like structure composed of resin-processed multifilament threads as a substrate, and a transparent resin sheet is laminated on the entire front and back surfaces of the coarse lattice-like structure. In the composite, the resin-processed multifilament threads are 1) coated with a vinyl chloride resin composition containing an aromatic phosphate ester compound, and the filaments constituting the multifilament threads are covered with each other. By filling the entire void and making the difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition within 0.05, the presence of the resin-processed multifilament thread is optically soft chloride. It is assimilated with the vinyl resin composition, and as a result, the effect of optically eliminating the presence of the coarse lattice-like structure is exhibited. By having a transparent coating layer made of one or more selected from acrylic resins and keeping the difference in refractive index (JIS K7142) between this transparent coating layer and the vinyl chloride resin composition within 0.05, 1) The transparency of the thread is maintained, and even if the transparent coating layer is provided, there is no drawback that the flexibility is greatly impaired. In addition, this transparent coating layer acts as a barrier layer to prevent the aromatic phosphate ester compound from migrating and diffusing to the transparent resin sheet side, so that the aromatic phosphate ester compound can be stably contained in the resin-processed multifilament thread. By staying at, there is no white turbidity exposure that the presence of the coarse lattice-like structure obstructs the view over time, the visibility of the entire sheet can be maintained well, and long-term weather resistance (resistance to weather). Since a transparent flexible sheet with excellent discoloration property can be obtained, for example, main body materials for outdoor applications such as membrane structure structures (pavilion exterior, museum objects, museum objects), seat houses, gardening houses, and parts such as light-collecting windows. It can be widely used for materials and industrial materials such as partitions used for indoor applications such as electronic / electrical equipment factories, hospitals / research facilities, curtains, equipment covers, and miscellaneous goods such as bags and leisure sheets.

Cross-sectional view of the resin-processed multifilament yarn constituting the coarse lattice-like structure which is the base material of the transparent flexible sheet of the present invention. The figure which shows an example of the coarse lattice structure which is the base material of the transparent flexible sheet of this invention. The figure which shows an example of the transparent flexible sheet of this invention

The transparent flexible sheet of the present invention is a composite in which a coarse lattice-like structure composed of resin-processed multifilament threads is used as a substrate, and transparent resin sheets are laminated on the entire front and back surfaces of the coarse lattice-like structure. In the body, the resin-processed multifilament threads are 1) a vinyl chloride resin composition containing an aromatic phosphate ester compound, which covers the multifilament threads, and voids between the filaments constituting the multifilament threads. The entire surface is filled, 2) the difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition is within 0.05, and 3) further 1) the entire surface of the thread is made of an epoxy resin. It has a transparent coating layer made of one or more selected from styrene resin and acrylic resin, and the difference in refractive index (JIS K7142) between this transparent coating layer and the vinyl chloride resin composition is within 0.05. It is a composition.

The coarse lattice-like structure used for the transparent flexible sheet of the present invention is 1) a woven fabric composed of warp / multifilament yarn group and weft / multifilament yarn group, or 2) warp / multifilament yarn group. 40 ° to 65 °, preferably 55 ° to 65 °, particularly preferably 60 ° left-up bias / multifilament thread group, and 40 ° to 65 °, preferably 55 ° to 65 °, particularly preferably 60 ° right-up bias. / Triaxial woven fabric composed of multifilament yarn group, or 3) Warp / multifilament yarn group, weft / multifilament yarn group, 40 ° to 65 °, preferably 40 ° to 50 °, particularly preferably 45 °. Left-up bias / multifilament yarn group, and quadrilateral fabric composed of 40 ° to 65 °, preferably 40 ° to 50 °, particularly preferably 45 ° right-up bias / multifilament yarn group. Using any one of them as a base material, the entire base material is coated and filled with a vinyl chloride resin composition, and is transparent with one or more selected from epoxy-based resin, styrene-based resin, and acrylic-based resin. A woven fabric provided with a coating layer, or woven using 4) warp / resin processed multifilament yarn group and weft / resin processed multifilament yarn group, or 5) warp / resin processed multifilament yarn group. Group, 40 ° to 65 °, preferably 55 ° to 65 °, particularly preferably 60 ° left-up bias / resin-processed multifilament thread group, and 40 ° to 65 °, preferably 55 ° to 65 °, particularly preferably 60 °. Right-up bias / triaxial woven fabric woven using resin-processed multifilament yarn group, or 6) warp / resin-processed multifilament yarn group, weft / resin-processed multifilament yarn group, 40 ° to 65 ° 40 ° to 50 °, particularly preferably 45 ° upward-sloping bias / resin processing, and 40 ° to 65 °, preferably 40 ° to 50 °, particularly preferably 45 ° upward-sloping bias / resin processing. It is a quadruple woven fabric woven using a group of multifilament yarns. The structure of the woven fabric includes a woven fabric having a void ratio of 40 to 90%, particularly 50 to 85%, a woven fabric having a void ratio of 40 to 90%, particularly a woven fabric having a void ratio of 50 to 85%, a woven fabric having a triaxial woven fabric, or a quadruped woven fabric made from a plain woven fabric, a basket woven fabric, a mock woven fabric, a Russell knitted fabric, or the like. The area per coarse grid of the coarse grid structure is preferably in the range of 25 mm ² to 111 mm ² , and all the coarse grid areas are substantially equal. If the area per coarse grid is less than 25 mm ² , the ratio of the coarse grid-like structure to the entire sheet may be increased, and the discoloration of the resin-processed multifilament yarn may be noticeable. Further, if the area of one coarse lattice exceeds 111 mm ² , it becomes difficult to perform a plain weave with a small difference in unevenness of the woven fabric structure. In particular, in the case of the woven fabrics 1) and 4), as a result, in the case of the triaxial woven fabrics having a warp / weft resin-processed multifilament yarn group with a driving density of 2 to 4 threads / inch, 2) and 5). As a result, in the case of quadrilateral fabrics with a warp / bias resin-processed multifilament thread group driving density of 2 to 4 threads / inch, 3) and 6), the result is a warp / weft / bias resin. The driving density of the processed multifilament yarn group is 2 to 4 threads / inch.

On the other hand, in the coarse lattice-like structure used for the transparent flexible sheet of the present invention, 7) warp / resin-processed multifilament threads and weft / resin-processed multifilament threads are fixed at warp / weft intersections. A shaft net (non-woven fabric) having a transparent coating layer made of one or more selected from epoxy-based resin, styrene-based resin, and acrylic-based resin as the outermost layer can be used. The arrangement of threads at the warp / weft intersection in these biaxial nets (non-woven) is as follows: a) All the warp and weft groups are placed at equal intervals on all the weft threads in which the weft groups are arranged at equal intervals. Arranged biaxial net (including the inverted mode), b) Arrange the warp and weft groups at equal intervals (for example, n intervals), and part of the warp and weft groups at equal intervals (for example, 2n intervals). A biaxial net (front and back) in which the remaining warp and weft groups are laid on the wefts at equal intervals (for example, 2n intervals) and the warp and weft groups are arranged at equal intervals (for example, n intervals). (Including the inverted aspect), c) Arrange the warp and weft groups at equal intervals (for example, n intervals), and arrange a part of the warp and weft groups on the warp and weft groups at equal intervals (for example, 2n intervals). A biaxial net in which the remaining warp and weft groups are laid at equal intervals (for example, 2n intervals) on the warp and weft groups and arranged so that the weft groups are evenly spaced (for example, n intervals). Can be mentioned. Here, the relationship between "some thread groups" and "remaining thread groups" is that when some thread groups are arranged as odd-numbered threads, the remaining thread groups are arranged as even-numbered threads. The relationship of threads (odd numbers are arbitrary such as 1,3,5,7,9 ..., or 1,5,9,13 ... The same applies to even numbers). Also, when the arrangement order of some thread groups is a pair of "1, 2," "5, 6" "9, 10" ..., the arrangement order of the remaining thread groups is "3, 4" "3, 4" " Pairs of "7,8", "11,12" ..., 3 or more pairs are arranged in a sequence of the same rule. In particular, some thread groups may be random, and the remaining thread groups may also be in a random manner.

Or 8) Warp / resin processed multifilament thread group, 40 ° to 65 ° preferably 55 ° to 65 °, particularly preferably 60 ° left-up bias resin processed multifilament thread group, and 40 ° to 65 ° preferably. The 55 ° to 65 ° upward-sloping bias resin-processed multifilament thread group, particularly preferably 60 °, is a triaxial net (non-woven) fixed at the warp / bias intersection with respect to the resin-processed multifilament thread group. A vinyl chloride resin composition coated and filled with a transparent coating layer made of one or more selected from an epoxy resin, a styrene resin, and an acrylic resin can be used. The yarn arrangement at the warp / bias intersection in these triaxial nets (non-woven) is as follows: d) All 40 warp / resin processed multifilament yarn groups are arranged on all of these warp yarn groups arranged at equal intervals. °-65 ° left-up bias / resin-processed multifilament thread group is placed on top of each other at equal intervals, and 40 ° -65 ° right-up bias / resin-processed multifilament thread group is placed at equal intervals. Triaxial non-woven nets (including the inverted front and back) arranged on top of each other, e) Warp / resin processed multifilament yarn groups are arranged at equal intervals, and all of them are placed on all of these warp yarn groups. 40 ° to 65 ° left (right) rising bias / resin processed multifilament yarn group placed at equal intervals, and all 40 ° to 65 ° right (left) rising bias / resin processed multifilament yarn group Triaxial non-woven net (including the inverted front and back) arranged so as to be laid on all warp yarn groups at equal intervals, f) Warp / resin processed multifilament yarn groups at equal intervals (for example, n intervals) A part of the 40 ° to 65 ° upward-sloping bias / resin-processed multifilament yarn group is placed at equal intervals (for example, 2n intervals) on all of these warp yarn groups arranged in step 1, and the remaining yarns are arranged. The groups are arranged so as to be spread over all the warp yarn groups at equal intervals (for example, 2n intervals), and further, a part of the 40 ° to 65 ° left-up bias / resin-processed multifilament yarn group is placed on the warp yarn group. Are placed at equal intervals (for example, at 2n intervals), and the remaining threads are arranged so as to be laid on all warp threads at equal intervals (for example, at 2n intervals). Triaxial net (including the inverted mode) in which the threads are evenly spaced (for example, n-spaced) and the threads of the right-biased thread groups are evenly spaced (for example, n-spaced), g) 40 ° to 65 ° right. Upward bias / resin processed multifilament yarn group and 40 ° to 65 ° right upward bias / resin processed multifilament yarn group are arranged at equal intervals (for example, n intervals), and warp is placed on the left and right bias yarn group. / A part of the resin-processed multifilament yarn group is placed at equal intervals (for example, 2n interval), and the remaining thread groups are laid at equal intervals (for example, 2n interval) on all left and right bias yarn groups. A triaxial net (including a mode in which the front and back are inverted) in which the yarns of the warp / resin-processed multifilament yarn groups are evenly spaced (for example, n-spaced), h) left-right bias in the above-mentioned g) mode. A triaxial net in which yarn groups are alternately arranged above and below the other's yarn ( (Including the aspect in which the front and back are inverted) can be used. See the end of paragraph [0021] for the relationship between "some thread groups" and "remaining thread groups".

Or 9) Warp / resin processed multifilament thread group, weft / resin processed multifilament thread group, 40 ° to 65 °, preferably 40 ° to 50 °, particularly preferably 45 ° left-up bias resin processed multifilament thread. A four-axis net (non-woven) in which a group and a group of multifilament threads processed with a right-up bias resin of 40 ° to 65 °, preferably 40 ° to 50 °, particularly preferably 45 °, are fixed at a warp / weft / bias intersection. The resin-processed multifilament thread group was coated and filled with a vinyl chloride resin composition, and a transparent coating layer made of one or more selected from epoxy-based resin, styrene-based resin, and acrylic-based resin was provided. Things can be used. The thread arrangement at the warp / latitude / left / right bias intersection in these four-axis nets is a combination of the aspect of the two-axis net described in paragraph [0021] and the mode group of the three-axis net described in paragraph [0022]. Either.

The area per coarse grid in the coarse grid-like structure (net) of 7) to 9) is preferably in the range of 100 mm ² to 2600 mm ² , and all the coarse grid areas are substantially equal. If the area per coarse grid is less than 100 mm ² , the ratio of the coarse grid-like structure to the entire sheet may be increased, and the discoloration of the resin-processed multifilament yarn may be noticeable. Further, if the area per coarse grid exceeds 2600 mm ² , the ratio of the coarse grid-like structure to the entire sheet may be reduced, and the strength and dimensional stability of the transparent flexible sheet may be impaired. In particular, in the case of the biaxial net of 7), the driving density of each resin-processed multifilament thread of warp / weft is 0.5 to 2.5 lines / inch, and in the case of the triaxial net of 8), warp / bias respectively. In the case of a 4-axis net with a resin-processed multifilament thread driving density of 0.5 to 2.5 lines / inch, 9), the driving density of each resin-processed multifilament thread is warp / weft / bias. It is 0.5 to 2.5 lines / inch.

In the coarse lattice-like structures 1) to 9) used for the transparent flexible sheet of the present invention, the resin-processed multifilament threads are selected from glass fibers, polyester fibers, polyamide fibers, polypropylene fibers, vinylon fibers, and vinyl chloride fibers. One or more kinds of multifilaments (converging 100 to 500 single yarns having a diameter of 1 to 20 μm) can be used, and the use of glass fiber is particularly preferable. The multifilament yarn made of glass fiber is preferably a multifilament yarn having a fineness of 138 to 1111dtex (decitex), particularly 277 to 833dtex and a refractive index of 1.55 to 1.56, and each filament single yarn constituting the multifilament yarn is preferable. The diameter of the yarn is 1 μm to 15 μm, particularly 5 μm to 12 μm, and a yarn obtained by bundling these filament single yarns with 50 to 500 yarns, particularly 200 to 400 yarns is preferable. In particular, examples of the glassy material forming the filament include known glass compositions such as E (non-alkali) glass, C (containing alkali) glass, M glass, A glass, S glass, and D glass, and particularly for industrial material sheet applications. Then, E glass (JIS K7142: refractive index 1.55 to 1.56) is preferable, and by doing so, it is optically integrated by approximating the refractive index of the vinyl chloride resin composition to measure (semi) transparency. In the transparent appearance of the sheet obtained in the above, the presence of the coarse lattice-like structure is made inconspicuous, and it is possible to make it more possible not to block the view. In particular, when glass fiber is used, a glass fiber whose surface has been modified with a known silane coupling agent for the purpose of adjusting the refractive index can also be used.

The cross-sectional shape of the multifilament thread used for the resin-processed multifilament thread is an ellipse or a substantially rectangular shape with arcs at both ends, and the ratio of height to width in this cross-sectional shape is 2: 3 to 1: 5, especially 1: By setting the ratio to 2 to 1: 5, it is possible to further improve the transparency when observing from the front of the sheet when measuring (semi) transparency by approximation to the refractive index of the vinyl chloride resin composition. These multifilament yarns are preferably yarns twisted at a pitch of 0 to 1 time / 25 mm in the spinning process. In the present invention, it is most preferable to use a non-twisted yarn having 0 twists, but a weakly twisted yarn twisted 0.5 to 0.7 times is particularly preferable from the viewpoint of preventing the yarn from fraying and handling. Further, these multifilament yarns that have been subjected to adhesive treatment, oil treatment, sizing agent treatment, or the like can also be used. Therefore, in the coarse lattice-like structures 1) to 6) used for the transparent flexible sheet of the present invention, the cross-sectional shape of the resin-processed multifilament thread is an ellipse or a substantially rectangular shape with arcs at both ends, and the height and width in this cross-sectional shape. By setting the ratio of 2: 3 to 1: 5, especially 1: 2 to 1: 5, from the front of the sheet when measuring (semi) transparency by approximation to the refractive index of the vinyl chloride resin composition. It makes it possible to further improve the transparency in observation.

The resin-processed multifilament thread is a base material of a vinyl chloride resin composition containing an aromatic phosphate ester compound, using any one of 1) a woven fabric, a triaxial woven fabric, or a quaternary woven fabric as a base material. A coarse lattice-like structure obtained by coating the outermost layer of the base material, which is coated with the above and filled the gaps between the multifilaments, with an epoxy resin or a styrene resin / acrylic resin blend to provide a transparent coating layer. It is a component of. 2) Further, the outermost layer of the filaments in which the multifilament threads are coated with a vinyl chloride resin composition containing an aromatic phosphate ester compound and the gaps between the multifilaments are filled with epoxy is applied to the multifilament threads. It is a thread provided with a transparent coating layer coated with one or more selected from a based resin, a styrene resin, and an acrylic resin. By fixing the stack of the resin-processed multifilament yarns, a coarse lattice-like structure made of non-woven fabric is constructed. 3) Further, the multifilament threads are covered with a vinyl chloride resin composition containing an aromatic phosphate ester compound, and the threads are filled with gaps between the multifilaments. A coarse structure made of non-woven fabric is formed by fixing the layers of the resin, and the outermost layer of the coarse structure is coated with one or more selected from epoxy-based resin, styrene-based resin, and acrylic-based resin to be transparent. It is a component of a coarse lattice-like structure obtained by providing a solid coating layer.

In paragraphs 1 to 3), the means for covering the threads (or the base material) with the vinyl chloride resin composition containing the aromatic phosphate ester compound and filling the gaps between the multifilaments is aromatic. The thread (or base material) is immersed in a liquid bath of a vinyl chloride resin paste sol containing a phosphoric acid ester compound (liquid) and whose viscosity has been adjusted, and the capillary phenomenon due to the gap between the multifilaments is utilized, or Under reduced pressure, the vinyl chloride resin paste sol is infiltrated into the gaps between the multifilaments, completely replaced with the air existing in the gaps between the multifilaments, and then the thread (or the base material) is pulled up, and this is applied to the two filaments. By squeezing with a rubber roll, it is possible to coat the thread (or substrate) with a thickness of 0.005 to 0.1 mm and fill the gaps between the multifilaments, and then at 150 to 200 ° C. for 15 to 120 seconds. This is achieved by gelling (solidifying) the vinyl chloride resin paste sol by heating. Alternatively, with a vinyl chloride resin paste sol containing an aromatic phosphate ester compound (liquid) and having its viscosity adjusted, the threads (or base material) are subjected to extrusion coating, knife coating, gravure coating, etc., and the multifilaments are coated with each other. Utilizing the capillary phenomenon due to the gap or under reduced pressure, the vinyl chloride resin paste sol is infiltrated into the gap between the multifilaments and completely replaced with the air existing in the gap between the multifilaments, and then at 150 to 200 ° C. By gelling (solidifying) the vinyl chloride resin paste sol by heating for 15 to 120 seconds, the thread (or base material) is coated with a thickness of 0.005 to 0.1 mm, and the gaps between the multifilaments are filled. Is achieved.

The vinyl chloride resin composition described in paragraphs 1) to 3) and paragraph [0028] includes a vinyl chloride resin (refractive index 1.54) and an aromatic phosphate ester compound (JIS K7142: refractive index 1. A gelled (solidified) transparent resin composition having a refractive index of 1.52 to 1.56 according to JIS K7142, which is mainly composed of a liquid of 508 to 1.563), and other known plasticizers for vinyl chloride resin. It is preferable to adjust the composition of a known stabilizer (for example, an epoxy-based compound) for a vinyl chloride resin within the range of the refractive index of the vinyl chloride resin composition in the range of 1.52 to 1.56. If necessary, known additives such as an ultraviolet absorber, a light-resistant stabilizer, an antioxidant, and an antifungal agent can be used, and the refractive index of the vinyl chloride resin composition is subject to the same restrictions as described above. The vinyl chloride resin is most preferably a homopolymer of a vinyl chloride monomer (emulsified polymer powder), but a vinyl chloride-based copolymer resin made of a vinyl chloride monomer and another vinyl monomer can also be used. The blending amount of the aromatic phosphoric acid ester compound is 50 to 200 parts by mass, preferably 750 to 150 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. The aromatic phosphate ester compounds include tricredyl phosphate (refractive index 1.557), triphenyl phosphate (refractive index 1.552 to 1.563), trixylenyl phosphate (refractive index 1.554), and cresyl phosphate. One or more selected from diphenyl (refractive index 1.560) and 2-ethylhexyl diphenyl phosphate (refractive rate 1.508 to 1.511) can be used. The above refractive index is based on JIS K 7142.

The refractive index of JIS K7142 of the vinyl chloride resin composition described in paragraphs [0027] to [0029] and the vinyl chloride resin composition in which a plasticizer and / or an epoxy compound is used in combination is 1.52 to 1.56. The range of is preferable. By setting the difference in refractive index (JIS K7142) between this vinyl chloride resin composition and the multifilament thread within 0.05, the presence of the resin-processed multifilament thread is optically different from that of the soft vinyl chloride resin composition. It is assimilated, and as a result, the transparency and visibility of the sheet are improved by the effect of optically eliminating the presence of the coarse lattice-like structure. The refractive index (JIS K7142) of such a multifilament yarn is 1.47 to 1.61. The plasticizers that can be added to the vinyl chloride resin compositions described in paragraphs [0027] to [0029] include phthalic acid dialkyl esters, isophthalic acid dialkyl esters, terephthalic acid dialkyl esters, cyclohexanedicarboxylic acid dialkyl esters, and One or more selected from cyclohexene dicarboxylic acid dialkyl esters, preferably in an amount of 1 to 35% by mass based on the mass of the aromatic phosphate ester compound used. When the blending amount of these plasticizers exceeds 35% by mass, the difference in refractive index exceeds 0.05, the presence of multifilament threads does not become (semi) transparent, and the presence of coarse lattice-like structures is conspicuous in the sheet. May impair visibility. Further, the epoxidic compounds that can be contained in the vinyl chloride resin compositions described in paragraphs [0027] to [0029] act as heat-resistant / weather-resistant stabilizers for the vinyl chloride resin, and these are epoxidized soybean oil and epoxidized. One or more selected from flaxseed oil, epoxidized fatty acid butyl, epoxidized fatty acid 2-ethylhexyl, epoxidic hexahydrophthalate 2-ethylhexyl, and epoxidic hexahydrophthalate diepoxystearyl, which is an aromatic phosphate ester compound used. A compounding amount of 1 to 25% by mass is preferable with respect to the compounding amount of. When the blending amount of these epoxy compounds exceeds 25% by mass, the difference in refractive index exceeds 0.05, the presence of multifilament threads does not become (semi) transparent, and the presence of coarse lattice-like structures is conspicuous. It may impair the visibility of the seat.

The resin-processed multifilament yarn according to paragraphs 1) to 3) has an epoxy-based resin, a styrene-based resin, and an acrylic-based resin on the entire surface of the yarn (or the base material) manufactured in paragraph [0028]. A transparent coating layer having a refractive index (JIS K7142) of 1.47 to 1.61, preferably 1.52 to 1.56, having a refractive index (JIS K7142) of one or more selected from the above is provided in the range of 0.001 to 0.1 mm in thickness. It is a thing. This transparent coating layer acts as a barrier layer to prevent the aromatic phosphate ester compound from migrating and diffusing to the transparent resin sheet side, and the aromatic phosphate ester compound stably stays in the resin-processed multifilament thread. Therefore, the transparency effect of the coarse lattice-like structure can be stably maintained, there is no exposure that obstructs the view over time, and the visibility of the entire sheet can be maintained well. By keeping the difference in refractive index (JIS K7142) between this transparent coating layer and the vinyl chloride resin composition (resin-processed multifilament yarn) within 0.05, the transparency of the (semi) transparent yarn can be improved. It is possible to maintain and stably maintain the weather resistance (discoloration resistance) of the sheet without significantly impairing the flexibility even if the transparent coating layer is provided. The transparent coating layer is 1) a solvent-based paint containing one or more selected from epoxy-based resin, styrene-based resin, and acrylic-based resin dissolved in it, or 2) epoxy-based resin emulsion, styrene-based resin emulsion, and acrylic-based resin. It can be formed by immersing the thread (or substrate) produced in paragraph [0028] in a liquid bath of a water-based paint containing one or more selected from the emulsion, pulling it up and drying it, and another. In the method, it can be formed by coating with an extrusion coating on a thread (or a base material), a knife coating, a gravure coating, or the like using the above solvent-based paint or water-based paint.

The epoxy resin is a phenol novolac type epoxy resin, a cresol novolac type epoxy resin, a naphthol novolac type epoxy resin, a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, a bisphenol S type epoxy resin, and a trifunctional epoxy resin having a bisphenol A skeleton. (Bisphenol A skeleton-containing trifunctional epoxy resin), Stilben type epoxy resin, fluorene skeleton-containing epoxy resin, triphenol methane type epoxy resin, triphenol methane skeleton-containing novolac type epoxy resin, tetraphenol ethane type epoxy resin, alkyl-modified triphenol One or more of JIS K 7142 having a refractive index of 1.56 to 1.70, selected from methane type epoxy resin, biphenyl type epoxy resin, glyoxal type epoxy compound, arylalkylene type epoxy resin, and aliphatic type epoxy compound. Can be mentioned. As the curing agent used in combination with these, an acid anhydride-based curing agent and a cationic catalyst are preferable. As the acid anhydride curing agent, phthalic anhydride, maleic anhydride, (hydrous) anhydrous nagic acid, methyl hydrogenated anhydrous nagic acid, anhydrous glutaric acid, anhydrous trimellitic acid, anhydrous pyromellitic acid, tetrahydrophthalic anhydride , Methyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, dodecenyl succinic anhydride, dichlorosuccinic anhydride, benzophenone tetracarboxylic acid anhydride, chlorendic acid anhydride, cyclohexanetricarbonate One or more selected from acid anhydrides and the like can be mentioned, and the epoxy resin has a refractive index of 1.50 to 1.60 of JIS K 7142 as a composition containing 20 to 50% by mass of the reactants of these curing agents. The one is preferable. Methylhexahydrophthalic anhydride and methylhydrogenated nadic acid are particularly preferable because of their excellent transparency. In particular, in order to accelerate the curing reaction, 0.1 to 0.5% by mass of peroxide-based compounds, amine-based compounds, phenol-based compounds, quaternary ammonium-based compounds, quaternary phosphonium-based compounds, aromatic sulfonium salts, etc. It is preferable to use it.

Examples of the styrene resin include polystyrene, styrene-methylstyrene copolymer, styrene-1,3-dimethylstyrene copolymer, styrene-4-propylstyrene copolymer, styrene-4-cyclohexylstyrene copolymer, and styrene-. Examples thereof include styrene resins such as 4-dodecylstyrene copolymers and styrene-2-ethyl-4-benzylstyrene copolymers, and copolymer resins of styrene-based monomers and other copolymerizable monomers. For example, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, styrene-methyl methacrylate- (meth) acrylic acid ester copolymer, styrene having a refractive index of 1.50 to 1.60 of JIS K7142. -Methyl methacrylate- (meth) acrylic acid copolymer, styrene-maleic anhydride copolymer and the like. Examples of the styrene-based copolymer that can be used in combination with other styrene-based copolymers and the above-mentioned styrene-based copolymer include styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, and styrene-vinylisoprene. -Sterium block copolymer, styrene-ethylene-butene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer, styrene-butadiene block copolymer, styrene-isoprene block copolymer, styrene-ethylene -Butemblock copolymers, styrene-ethylene-buteneblock copolymers and the like having a refractive index of 1.50 to 1.60 of JIS K7142 can be used. Examples of the styrene monomer of these styrene-based copolymers include styrene, methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 1-vinylnaphthalene, and 1-vinyl. Anthracen and the like can be mentioned.

Further, as the acrylic resin, and as the acrylic resin, a homopolymer made of one kind of monomer selected from monofunctional (meth) acrylic acid esters, a copolymer made of two or more kinds of monomers, and a polyfunctional (polyfunctional). A homopolymer with one kind of monomer selected from meta) acrylic acid esters, or a copolymer with two or more kinds of monomers, one or more kinds selected from these monomers and modified (meth) acrylic acid esters (for example). A (co) polymer having a refractive index of 1.50 to 1.60 according to JIS K7142, such as a copolymer with a monomer such as epoxy-modified, polyester-modified, or urethane-modified) is preferable. Here, "(meth) acrylic acid ester" is a notation that simultaneously represents two types, "acrylic acid ester" and "methacrylic acid ester". The number of carbon atoms in these ester moieties is 1 to 18, and an alkyl ester of 1 to 8 is particularly preferable. The acrylic resin may be a copolymer with a monomer other than acrylic, and the monomer other than acrylic may be ethylenically unsaturated carboxylic acids such as maleic acid, itaconic anhydride, succinic anhydride, acrylamide, and meta. Amido compounds such as acrylamide, N-methylacrylamide and N-methylolacrylamide, hydroxyl group-containing (meth) acrylic acids such as hydroxyethyl acrylate and hydroxyethyl methacrylic acid, styrenes, α-olefins, vinyl ethers and alkenyls. , Vinyl esters, aromatic vinyl compounds and the like can also be used.

The transparent resin sheet laminated on the entire front surface and the back surface of the coarse lattice structure is composed of a soft vinyl chloride resin composition mainly composed of a vinyl chloride resin and a plasticizer, and the plasticizer is a phthalic acid dialkyl ester. , Isophthalic acid dialkyl ester, terephthalic acid dialkyl ester, cyclohexanedicarboxylic acid dialkyl ester, and cyclohexene dicarboxylic acid dialkyl ester. be. Adipate ester, sebacic acid ester, trimellitic acid ester, pyromellitic acid ester, adipate polyester, adipate polyester, citric acid ester, benzoic acid ester, ethylene / carbon monoxide / acetic acid can be used as plasticizers for transparent resin sheets. A vinyl ester ter polymer, an ethylene / carbon monoxide / acrylic acid ester ter polymer, or the like can be used in combination. As the transparent resin sheet, a transparent film having a thickness of 0.1 mm to 0.5 mm processed by calendar molding or T-die extrusion molding of a soft vinyl chloride resin can be used, and in order to impart weather resistance and UV resistance. , Known UV absorbers such as benzotriazole compounds, benzophenone compounds, cyanoacrylate compounds, known light stabilizers of hindered amine compounds (HALS), and known antioxidants such as phenol compounds and hindered phenol compounds. It is preferable to add 0.01 to 3 parts by mass of the agent and the like with respect to the mass of the vinyl chloride resin. The transparent flexible sheet of the present invention is obtained by using a coarse grid-like structure as a substrate and laminating a transparent resin sheet on the entire front surface and back surface of the coarse grid-like structure using a thermal pressure laminate or an adhesive. The sheet is made of a composite and has a thickness of 0.2 mm to 2.0 mm, particularly preferably 0.4 mm to 0.8 mm.

In the transparent flexible sheet of the present invention, nanoparticles made from an inorganic colloidal substance having a primary particle diameter of 3 nm to 150 nm are hydrolyzed and condensed with a silane coupling agent on the surface (front side and / or back side) of the transparent resin sheet. An antistatic antifouling layer can be provided, which is supported by a binder component containing a substance. Examples of the inorganic colloidal substance include photocatalytic titanium oxide sol, photocatalytic zinc oxide sol, photocatalytic tin oxide sol, titanium oxide sol, zinc oxide sol, tin oxide sol, silica sol, aluminum oxide sol, zirconium oxide sol, cerium oxide sol, and composite oxidation. One or more metal oxides selected from a zinc oxide-antimonite pentoxide complex or a tin oxide-antimonide pentoxide complex sol are preferred. The antistatic antifouling layer is a transparent liquid composition containing 1 to 25% by mass of an inorganic colloidal substance and 1 to 10% by mass of a silane coupling agent with respect to the mass of nanoparticles made from the inorganic colloidal substance. The surface of the flexible sheet (transparent resin sheet) can be coated with a gravure coat method, a micro gravure coat method, a comma coat method, a roll coat method, a reverse roll coat method, a bar coat method, a kiss coat method, a flow coat method, a spray method, etc. It is a sol-gel thin film having a thickness of 0.1 μm to 10 μm, which is obtained by drying and solidifying with hot air or a heater after coating. The surface resistance value of the obtained transparent flexible sheet (measurement method: JIS K6911: 1995: measurement condition: humidity 30% RH-temperature 23 ° C.) can be set to antistatic property of less than 1.0E + 12Ω. The silane coupling agent is used in combination in the form of a hydrolysis condensate of the silane coupling agent to improve the wear resistance of the antistatic antifouling layer, and the silane coupling agent is a general formula: XR-Si (Y) ₃ . A compound having two or more different reactive groups in the molecule represented by, for example, X = amino group, vinyl group, epoxy group, chlor group, mercapto group, etc. (R = alkyl chain), Y = methoxy group. , Ethoxy group, etc. The antistatic antifouling layer is preferably formed on the entire surface of a transparent flexible sheet (transparent resin sheet), but may be formed in a grid-like network.

In the transparent flexible sheet of the present invention, the surface (front side and / or back side) of the transparent resin sheet has an acrylic resin, a urethane resin, an acrylic / silicon copolymer resin, a fluorine-based copolymer resin, and an acrylic resin. An antifouling layer composed of one or more coating materials selected from a blend of a fluoropolymer resin, a urethane / silicon-based graft copolymer resin, and a urethane / fluoropolymer-based graft copolymer resin is provided. It is preferable to have. As the acrylic resin, those exemplified in paragraph [0034] can be used. The fluoroolefin copolymer resin is preferably a fluoroolefin copolymer resin that is soluble in an organic solvent. The fluoroolefin monomer is obtained by copolymerizing two or more kinds selected from, for example, vinyl fluoride, vinylidene fluoride, trifluoroethylene, tetrafluoroethylene, chlorotrifluoroethylene, hexafluoropropylene and the like, and particularly. The vinylidene fluoride-based copolymer resin is preferable because it has excellent solubility in an organic solvent, and the one obtained by copolymerizing a vinyl monomer (alkyl-substituted-α-olefins, alkyl vinyl ethers, vinyl group-containing esters, etc.) is organic. It is excellent in solubility in a solvent and is preferable. These fluoroolefin copolymer resins have reactive groups such as hydroxyl groups and carboxyl groups contained in the copolymerized vinyl component as known curing agents (crosslinking agents) such as isocyanate compounds, aziridine compounds, oxazoline compounds, carbodiimide compounds, and melamine compounds. ) To form a crosslinked network, the wear resistance, acid rain resistance, weather resistance, etc. of the antifouling layer coating can be improved. The amount of the curing agent (crosslinking agent) used is 1 to 20% by mass, preferably 3 to 15% by mass in terms of solid content with respect to the fluoroolefin copolymer resin (solid content). The blend ratio of the acrylic resin and the fluorine-based copolymer resin is 1:99 to 99: 1. The urethane / silicon-based graft copolymer resin has a polysiloxane component in the side chain with the urethane resin as the main chain, and the urethane / fluorine-based graft copolymer resin has the urethane resin as the main chain in the side chain as described above. It has a copolymer resin component. This antifouling layer uses a solvent-type paint or an emulsion-type paint containing the above resin component at a solid content concentration of 1 to 35% by mass, and uses a gravure coat method, a micro gravure coat method, a comma coat method, a roll coat method, and a reverse roll. It is a coating film having a thickness of 1 μm to 50 μm obtained by coating by a coating method, a bar coating method, a kiss coating method, a flow coating method, a spray method, or the like, and then drying and solidifying with hot air or a heater. The antifouling layer can contain 0.1 to 10% by mass of the inorganic colloidal substance described in paragraph [0036] with respect to the mass of the resin component, thereby enhancing the antifouling effect and at the same time. Antistatic properties can be added.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto. The evaluation methods used in the examples and comparative examples of the present invention are shown below.
(1) Visibility (good or bad visibility)
Place the test piece sheet (height 60 cm x width 100 cm) within one month of manufacture on the height of the line of sight of the transparent window glass (indoor side) on the 3rd floor of the company building, and fix the four corners of the test piece sheet to the window glass with transparent tape. However, 10 panelists evaluated the quality of the visibility when observing the outdoor scenery at a standing position of 1 m from the window glass on a three-point scale, and adopted the highest evaluation. The observation evaluation was carried out for 30 minutes from 1:00 pm on a sunny day in September, and the observation was performed on a window surface with a view that was in front of the light.
Evaluation "A": The presence of the coarse grid-like structure is inconspicuous and the visibility is good (wide field of view).
Evaluation "B": The presence of the coarse grid-like structure is slightly conspicuous and the visibility is slightly poor (the visibility is slightly narrow).
Evaluation "C": The presence of the coarse grid-like structure is conspicuous and the visibility is poor (the field of view is narrow).
(2) Visibility of the sheet after 6 months of use (good or bad visibility)
After allowing the test piece sheet to stand for 6 months from April to September, the same evaluation as in (1) was carried out.
(3) Visibility of the sheet after heating is promoted (good or bad visibility)
A test piece sheet (height 60 cm × width 100 cm) left to stand in an air circulation type oven at 65 ° C. for 480 hours was fixed in the same manner as in (1), and the same evaluation as in (1) was carried out.
(4) Discoloration by accelerated light resistance test
The accelerated light resistance test (JIS-K5600) using a xenon arc lamp was performed for 1000 hours, and the degree of discoloration and fading of the surface after the test was quantified as the color difference ΔE (JIS-Z8729) based on the test piece sheet before acceleration to determine the discoloration property. evaluated.

[Example 1]
(1) Coarse lattice-like structure intermediate 1 (net)
Glass with a single thread diameter of 9 μm (E glass: JIS K7142 refractive index 1.56) Filament x 400 filaments x 0.7 twists / 25 mm 68.7 tex count multifilament weft (with a substantially rectangular cross section) The height-to-width ratio of 2: 7) in the cross-sectional shape is used for the warp and weft group, the warp and weft groups are arranged at 2 cm intervals, and the odd threads in the arrangement order of the warp and weft group are warp and weft at 4 cm intervals. Arranged on the warp and weft group, and even threads in the order of arrangement of the warp and weft group were laid on the warp and weft at intervals of 4 cm and arranged so that the distance between the warp and weft groups was 2 cm. A non-woven biaxial net with a driving density of 1.27 lines / inch and a void ratio of 80% was used.
(2) Coarse lattice-like structure intermediate 2 (resin-impregnated coated net)
The vinyl chloride resin paste sol composition of the following [formulation 1] is prepared to an appropriate viscosity, and the biaxial net is immersed in a liquid bath filled with the paste sol composition of this [formulation 1] to obtain a multifilament thread. Is completely impregnated with the paste sol composition of [Formulation 1], and at the same time the biaxial net is pulled up and squeezed with a rubber roll to gel the paste sol composition of [Formulation 1] for 3 minutes in a hot air furnace at 180 ° C. After completion, a coarse lattice-like structure intermediate 2 made of a biaxial net impregnated with and coated with the vinyl chloride resin composition of [Formulation 1] was obtained. The gelled vinyl chloride resin composition had a refractive index of 1.548 according to JIS K7142.
[Formulation 1] Soft vinyl chloride resin paste sol composition
Emulsion Polymerized Polyvinyl Chloride Resin (Degree of Polymerization 1700) 100 parts by mass Tricredil Phosphate (Reflex 1.557) 140 parts by mass Evaporated soybean oil (stabilizer) 10 parts by mass Zinc stearate (stabilizer) 2 parts by mass Stearate Barium (stabilizer) 2 parts by mass Bentriazole compound (ultraviolet absorber) 0.2 parts by mass (3) Coarse lattice structure
The epoxy-based resin transparent composition of the following [formulation 2] is prepared to an appropriate viscosity with a MEK diluent, and the liquid composition of this [formulation 2] is prepared on both sides of the coarse lattice-like structure intermediate 2 by a gravure roll of 60 mesh. The liquid composition of [Formulation 2] is adhered to the entire outermost surface of the outermost layer of the coarse lattice-like structure intermediate 2 and heated and dried in a hot air furnace at 150 ° C. for 3 minutes. A coarse lattice-like structure (1) accompanied by a transparent coating layer on which the resin transparent composition was cured was obtained. JIS K 7142 of a transparent coating layer formed by the reaction of a bisphenol A skeleton-containing trifunctional epoxy resin (65 parts by mass) and cyclohexane-1,2,4-tricarboxylic acid-1,2-anhydride (35 parts by mass). The refractive index was 1.568.
[Formulation 2] Epoxy resin transparent composition
Epoxy resin (bisphenol A skeleton-containing trifunctional epoxy resin) 65 parts by mass
* Epoxy equivalent 260g / eq
Cyclohexane-1,2,4-tricarboxylic acid-1,2-anhydride 35 parts by mass
* Carboxyl equivalent 100g / eq
Peroxide-based curing accelerator 0.25 parts by mass Methyl ethyl ketone (MEK diluent) 300 parts by mass (4) Transparent flexible sheet
A transparent resin sheet with a thickness of 0.18 mm, which was calendar-molded from the soft vinyl chloride resin transparent composition of the following [formulation 3] under thermal conditions of 165 ° C to 180 ° C, was surface-transparent on both sides of the coarse lattice-like structure (1). A resin sheet and a transparent resin sheet on the back surface were formed, and the coarse lattice-like structure (1) was sandwiched between the front and back sheets as a base material, and the transparent resin sheet was thermally softened by passing through a laminator under a thermal roll condition of 170 ° C. In this state, laminated crimping and cooling were performed to obtain a transparent flexible sheet having a thickness of 0.36 mm and a mass of 457 g / m ² . In the obtained transparent flexible sheet, the difference in refraction (JIS K7142) between the multifilament and the vinyl chloride resin composition is 0.012 (within 0.05), and the refraction between the transparent coating layer and the vinyl chloride resin composition. The rate (JIS K7142) difference is 0.02 (within 0.05), and the obtained sheet has a coarse lattice-like structure that becomes translucent, and the transparency is assimilated with the laminated transparent resin sheet, resulting in visibility. It was very good, and this effect was still good after 6 months of use and after accelerating at 65 ° C. for 480 hours. Due to the presence of the transparent coating layer (epoxy resin), the aromatic phosphate ester compound contained in the vinyl chloride resin composition is retained in the resin-processed multifilament thread, and the aromatic phosphate ester compound is placed on the transparent resin sheet side. This is due to the invention of acting as a barrier layer to prevent migration and diffusion.
[Formulation 3] Soft vinyl chloride resin transparent composition
Suspended polyvinyl chloride resin (polymerization degree 1300) 100 parts by mass Diisononyl phthalate (DINP) 65 parts by mass Evaporated soybean oil (plasticizer) 5 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stable) Agent) 2 parts by mass benzotriazole compound (ultraviolet absorber) 0.2 parts by mass (5) Antifouling layer
The following fluororesin paint of [Formulation 4] is gravure-coated on one side (surface) of the transparent flexible sheet with a gravure roll of 100 meshille, heated and dried in a hot air furnace at 120 ° C. for 2 minutes, and then the fluorine-based resin of [Formulation 4] is applied. A transparent flexible sheet with a thickness of 0.36 mm and a mass of 460 g / m ² with an antifouling layer on which the resin paint is cured (crosslinking reaction between the hydroxyl group contained in the fluororesin and the isocyanurate trimer of hexamethylene diisocyanate). Obtained. The antifouling properties of the two types of transparent flexible sheets before and after attaching this antifouling layer are the antifouling properties of a commercially available oil-based pen (red), and after drying at room temperature for 60 seconds, the DRY tissue paper can be wiped off and removed (rubbing round trip 10). As a result of the evaluation in (1), the red ink characters on the sheet with the antifouling layer (which also has the effect of preventing the transfer of the plasticizer to the sheet surface) were clearly excellent in removal, and a small amount of residue remained. On the other hand, in the sheet without the antifouling layer, the red ink characters penetrated into the sheet, and the ink stains extended to the rubbed portion, which was unsightly. In addition, these two types of transparent flexible sheets were exposed outdoors for 3 months from August to October, and as a result of evaluation by WET tissue paper wiping removal property (rubbing round trip 10 times), it was clearly an antifouling layer (on the sheet surface). The sheet with an attached sheet (which also has the effect of preventing the transfer of the plasticizer) has excellent removal of adhering dust and restores the initial appearance, whereas the sheet without the antifouling layer transfers the plasticizer to the sheet surface. As a result, the attached soot and dust stubbornly stuck to it, and the initial appearance could not be restored. The difference in the refractive index between the multifilament and the vinyl chloride resin composition and the difference in the refractive index between the transparent coating layer and the vinyl chloride resin composition do not change regardless of the presence or absence of the antifouling layer.
[Compound 4] Fluorine-based resin paint (for forming an antifouling layer)
Hydroolefin vinyl ether copolymer containing hydroxyl group (fluorine-based resin) 100 parts by mass of hexamethylene diisocyanate isocyanurate trimer (isocyanate) 10 parts by mass Curing catalyst: dibutyltin dilaurate (about 10 ppm with respect to fluorine-based resin)
Toluene / Butyl Acetate (Diluent with a mass ratio of 1: 1) 100 parts by mass

[Example 2]
The thickness of the antifouling layer is the same as in Example 1 except that the epoxy-based resin transparent composition of [Formulation 2] of Example 1 is changed to the styrene-based resin transparent composition of [Formulation 5] below. A transparent flexible sheet having a thickness of 0.36 mm and a mass of 460 g / m ² was obtained. In the obtained transparent flexible sheet regardless of the presence or absence of the antifouling layer, the difference in refraction (JIS K7142) between the multifilament and the vinyl chloride resin composition is 0.012 (within 0.05), and the transparent coating layer. The difference in refraction (JIS K7142) between (JIS K7142 refraction coefficient 1.563) and the vinyl chloride resin composition is 0.015 (within 0.05), and the obtained sheet has a translucent coarse lattice structure. The transparency was assimilated with the laminated transparent resin sheet, so that the visibility was very good, and this effect was still good after 6 months of use and after promotion at 65 ° C. for 240 hours. Due to the presence of the transparent coating layer (styrene resin), the aromatic phosphate ester compound contained in the vinyl chloride resin composition is retained in the resin-processed multifilament thread, and the aromatic phosphate ester compound is placed on the transparent resin sheet side. This is due to the invention of acting as a barrier layer to prevent migration and diffusion.
[Formulation 5] Styrene-based resin transparent composition
Styrene-1,3-dimethylstyrene copolymer 50 parts by mass Styrene-butadiene-styrene block copolymer 50 parts by mass Methylethylketone (MEK diluent) 250 parts by mass Toluent (diluent) 250 parts by mass

[Example 3]
The thickness of the antifouling layer is the same as in Example 1 except that the epoxy resin transparent composition of [Formulation 2] of Example 1 is changed to the acrylic resin transparent composition of the following [Formulation 6]. A transparent flexible sheet having a thickness of 0.36 mm and a mass of 460 g / m ² was obtained. In the obtained transparent flexible sheet regardless of the presence or absence of the antifouling layer, the difference in refraction (JIS K7142) between the multifilament and the vinyl chloride resin composition is 0.012 (within 0.05), and the transparent coating layer. The difference in refraction (JIS K7142) between (JIS K7142 refraction coefficient 1.566) and the vinyl chloride resin composition is 0.018 (within 0.05), and the obtained sheet has a translucent coarse lattice structure. The transparency was assimilated with the laminated transparent resin sheet, so that the visibility was very good, and this effect was still good after 6 months of use and after promotion at 65 ° C. for 240 hours. Due to the presence of the transparent coating layer (acrylic resin), the aromatic phosphate ester compound contained in the vinyl chloride resin composition is retained in the resin-processed multifilament thread, and the aromatic phosphate ester compound is placed on the transparent resin sheet side. This is due to the invention of acting as a barrier layer to prevent migration and diffusion.
[Formulation 6] Acrylic resin transparent composition
50 parts by mass of methacrylic acid alkyl ester / acrylic acid alkyl ester copolymer 50 parts by mass of styrene-methyl methacrylate- (meth) acrylic acid ester copolymer Methyl ethyl ketone (MEK diluent) 250 parts by mass Toluent (diluent) 250 parts by mass Department

[Example 4]
Similar to Example 1 except that the biaxial net used in Example 1 was changed to the following triaxial net, a transparent flexible sheet having an antifouling layer with a thickness of 0.36 mm and a mass of 490 g / m ² was obtained. rice field. In the obtained transparent flexible sheet regardless of the presence or absence of the antifouling layer, the difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition is 0.012 (within 0.05), and the transparent coating layer. The difference in refractive index (JIS K7142) between (JIS K7142 refractive index 1.566) and the vinyl chloride resin composition was 0.02 (within 0.05).
Triaxial net
Glass with a single yarn diameter of 9 μm (E glass: JIS K7142 refractive index 1.56) Filament x 400 filaments x 0.7 twists / 25 mm 68.7 tex count multifilament yarn (cross-sectional shape is approximately rectangular) The height-to-width ratio of 2: 7) in the cross-sectional shape is used for the warp threads, the 60 ° right-up bias multifilament thread group, and the 60 ° left-up bias multifilament thread group, and the warp threads are divided at 2 cm intervals. A part of the 60 ° upward-sloping bias multifilament thread group is placed on all of these warp threads at 4 cm intervals, and the remaining thread groups are laid on all the warp threads at 4 cm intervals. Arrange them so that they can be pulled, and then place a part of the 60 ° left-up bias multifilament thread group on the warp group at 4 cm intervals, and place the remaining thread groups at 4 cm intervals for all the warp groups. The yarns of the right-up bias yarns are spaced 2 cm apart, and the yarns of the left-up bias yarns are spaced 2 cm apart, and the striking density of the warp and bias yarns is 1. A non-woven triaxial net with 27 lines / inch and a void ratio of 70% was used.

[Example 5]
Similar to Example 1 except that the biaxial net used in Example 1 was changed to the following tetraaxial net, a transparent flexible sheet having a thickness of 0.36 mm and a mass of 520 g / m ² with an antifouling layer was obtained. rice field. In the obtained transparent flexible sheet regardless of the presence or absence of the antifouling layer, the difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition is 0.012 (within 0.05), and the transparent coating layer. The difference in refractive index (JIS K7142) between (JIS K7142 refractive index 1.566) and the vinyl chloride resin composition was 0.02 (within 0.05).
4-axis net
Glass with a single yarn diameter of 9 μm (E glass: JIS K7142 refractive index 1.56) Filament x 400 filaments x 0.7 twists / 25 mm 68.7 tex count multifilament yarn (with a substantially rectangular cross section) The height-to-width ratio of 2: 7) in the cross-sectional shape was used for the warp and weft group, the 45 ° right-up bias multifilament thread group, and the 45 ° left-up bias multifilament thread group. Are arranged at intervals of 2 cm, odd threads in the order of arrangement of the warp and weft group are arranged on the warp and weft group at intervals of 4 cm, and even threads in the order of arrangement of the warp and weft group are arranged in the weft threads at intervals of 4 cm. It was laid and arranged so that the distance between the warp and weft groups was 2 cm. Next, a part of the 45 ° upward-sloping bias multifilament yarn group is placed on all of these warp and weft groups at 4 cm intervals, and the remaining thread groups are placed on all the warp and weft groups at 4 cm intervals. On top of the warp threads, a part of the 45 ° left-up bias multifilament thread group is placed at 4 cm intervals, and the remaining thread groups are placed at 4 cm intervals. Arranged so as to be laid in the thread group, the threads of the right-up bias thread group are spaced 2 cm apart, and the threads of the left-up bias thread group are spaced 2 cm apart, and the warp and weft threads and the bias thread are driven. A non-woven quaternary net with a density of 1.27 yarns / inch and a void ratio of 60% was used.

[Example 6]
On the antifouling layer of Example 1, the antistatic antistatic paint of the following [formulation 7] is applied with a 120-mesh gravure roll, heated and dried in a hot air furnace at 120 ° C. for 2 minutes, and then [blended 7]. An antistatic antistatic layer was additionally formed by sol-gel curing the antistatic antistatic paint, and a transparent flexible sheet having a thickness of 0.36 mm and a mass of 461 g / m ² was obtained. The antistatic antifouling layer is a sol-gel thin film in which an inorganic colloidal substance (photocatalytic titanium oxide sol and silica sol) is supported on a binder component by a hydrolysis condensate of a silane coupling agent. The surface resistance value of the transparent flexible sheet before and after the antistatic antistatic layer (measurement method: JIS K6911: 1995: measurement condition: humidity 30% RH-temperature 23 ° C) is clearly the antistatic antistatic layer. The antistatic property of about 1.0E + 11Ω could be exhibited in the sheet attached with the antistatic property, but the antistatic property remained at about 1.0E + 14Ω in the sheet not attached with the antistatic antifouling layer. Therefore, by attaching an antistatic antifouling layer, it is possible to significantly reduce the adhesion of soot and dust due to static electricity. In the obtained transparent flexible sheet regardless of the presence or absence of the antifouling layer and the antistatic antifouling layer, the difference in the refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition is 0.012 (within 0.05). ), And the difference in refractive index (JIS K7142) between the transparent coating layer (JIS K7142 refractive index 1.566) and the vinyl chloride resin composition was 0.018 (within 0.05).
[Compound 7] Antistatic antistatic paint (for forming an antistatic antifouling layer)
Photocatalytic titanium oxide sol (particle size 10 nm x solid content 8% by mass) 50 parts by mass Silica sol (particle size 12 nm x solid content 20% by mass) 50 parts by mass γ-glycidoxypropyltrimethoxysilane (silane coupling agent) 2% by mass Part Water / ethanol (diluter with a mass ratio of 1: 1) 50 parts by mass * Water / ethanol promotes the hydrolysis condensation reaction of the silane coupling agent and is combined with inorganic colloidal substances (photocatalytic titanium oxide sol and silica sol). Form a solgel intermediate.

[Comparative Example 1]
In the resin-processed multifilament thread constituting the coarse lattice-like structure of the transparent flexible sheet of Example 1, the thickness is the same as that of Example 1 except that the formation of the transparent coating layer (epoxy-based resin) of the outermost layer is omitted. A transparent flexible sheet having a diameter of 0.36 mm and a mass of 445 g / m ² was obtained. In the obtained sheet, the coarse lattice-like structure became translucent, and the transparency was assimilated with the laminated transparent resin sheet, so that the visibility was equivalent to that of the transparent flexible sheet of Example 1. However, this effect is lost after 6 months of use and after accelerating at 65 ° C for 240 hours, and the coarse grid-like structure becomes cloudy and becomes exposed, and as a result, the presence of the coarse grid-like structure obstructs the view. It became. This is because the transparent coating layer (epoxy resin), which is the barrier layer, is omitted, so that the tricredyl phosphate (aromatic phosphate ester compound) contained in the vinyl chloride resin composition is a transparent resin sheet from the resin-processed multifilament thread. By migrating and diffusing to the side, the refractive index of the vinyl chloride resin composition gradually decreased, and the difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition exceeded 0.05. It is a defect to be done.

[Comparative Example 2]
In the resin-processed multifilament thread constituting the coarse lattice-like structure of the transparent flexible sheet of Example 1, the formation of the transparent coating layer (epoxy-based resin) of the outermost layer is omitted, and the surface of the coarse lattice-like structure and the surface of the coarse lattice-like structure are omitted. The thickness is 0.36 mm, which is the same as in Example 1 except that the formulation [formulation 3] of the transparent resin sheet laminated on the entire surface of each of the back surfaces is changed to the soft vinyl chloride resin transparent composition of the following [formulation 8]. A transparent flexible sheet having a mass of 445 g / m ² was obtained.
[Formulation 8] Soft vinyl chloride resin transparent composition
Suspended-polymerized polyvinyl chloride resin (degree of polymerization 1300) 100 parts by mass Trickresyl phosphate (refractive index 1.557) 65 parts by mass Evaporated soybean oil (plasticizer) 5 parts by mass Zinc stearate (stabilizer) 2 parts by mass Steer Barium acid (stabilizer) 2 parts by mass Bentriazole compound (ultraviolet absorber) 0.2 parts by mass The coarse lattice structure of the obtained sheet becomes translucent, and the transparency is assimilated with the laminated transparent resin sheet. As a result, the visibility was equivalent to that of the transparent flexible sheet of Example 1. As in Comparative Example 1, by omitting the transparent coating layer (epoxy resin) which is the barrier layer, tricresyl phosphate (aromatic phosphate ester compound) was easily transferred from the resin-processed multifilament thread to the transparent resin sheet side. Nevertheless, by using tricresyl phosphate as the plasticizer of the transparent resin sheet, the coarse lattice-like structure does not appear cloudy even after 6 months, and the visibility is 6 months after the transparent flexible sheet of Example 1. Was equivalent to. However, as a result of conducting an accelerated light resistance test (JIS-K5600) using a xenon arc lamp for 1000 hours, the presence of a large amount of tricresyl phosphate contained in the transparent resin sheet caused colored yellowing (JIS-Z8729 color difference ΔE6.5). It became clear that it was inappropriate as a sheet material to be used by being exposed to sunlight.

[Comparative Example 3]
In the resin-processed multifilament thread constituting the coarse lattice-like structure of the transparent flexible sheet of Example 1, the formation of the outermost transparent coating layer (epoxy-based resin) by [formulation 2] is described in the following formulation [formulation 9]. A transparent flexible sheet having a thickness of 0.36 mm and a mass of 460 g / m ² was obtained in the same manner as in Example 1 except that the composition was changed to the urethane resin transparent composition (refractive index 1.495). In the obtained sheet, the transparent coating layer made of urethane-based resin certainly exerts an action as a barrier layer for preventing migration of tricresyl phosphate (aromatic phosphate ester compound), but the transparent coating layer and vinyl chloride resin are used. By increasing the difference in refractive index (JIS K7142) from the composition to 0.053 (exceeding 0.05), the coarse lattice-like structure becomes cloudy and becomes exposed, and as a result, the existence of the coarse-grained lattice-like structure is present. Became an obstructor to visibility.

The transparent flexible sheet obtained by the present invention uses a coarse lattice-like structure composed of resin-processed multifilament threads as a substrate, and a transparent resin sheet is laminated on the entire front and back surfaces of the coarse lattice-like structure. The difference in refractive index (JIS K7142) between the multifilament constituting the coarse lattice-like structure and the vinyl chloride resin composition shall be within 0.05, and the resin-processed multifilament thread shall be used. By simultaneously achieving the difference in refractive index (JIS K7142) between the transparent coating layer and the vinyl chloride resin composition within 0.05, it is possible to optically (semi) make the existence of the coarse lattice-like structure transparent. In addition, since the transparent coating layer is also effective in preventing the migration of the aromatic phosphate ester compound, the presence of the coarse lattice-like structure does not cause cloudiness and exposure over time and obstruct the view. , Maintains good visibility of the entire sheet and has excellent long-term weather resistance (discoloration resistance), so for example, membrane structure structures (pavilion exterior, museum objects, museum objects), sheet houses, gardening houses, etc. Main body materials for outdoor use and parts materials such as light windows, partitions used for indoor use such as electronic / electrical equipment factories, hospitals / research facilities, curtains, equipment covers, and miscellaneous goods such as bags and leisure sheets. Can be widely used for industrial materials such as.

(1) Resin-processed multifilament yarn (1-1) Filament (1-2) Multifilament yarn (1-3) Vinyl chloride resin composition (1-4) Transparent coating layer (2) Coarse lattice-like structure (3) Transparent resin sheet (4) Transparent flexible sheet

Claims (10)

A composite comprising a coarse lattice-like structure composed of resin-processed multifilament threads as a substrate and a transparent resin sheet laminated on the entire front surface and back surface of the coarse lattice-like structure, wherein the resin processing is performed. The multifilament threads are 1) covered with a vinyl chloride resin composition containing an aromatic phosphate ester compound, and the entire voids between the filaments constituting the multifilament threads are filled with 2). ) The difference in refractive index (JIS K7142) between the multifilament and the vinyl chloride resin composition is within 0.05. It is characterized by having a transparent coating layer made of one or more selected from acrylic resins, and the difference in refractive index (JIS K7142) between the transparent coating layer and the vinyl chloride resin composition is within 0.05. Transparent flexible sheet. The transparent flexible according to claim 1, wherein the cross-sectional shape of the resin-processed multifilament yarn is an ellipse or a substantially rectangular shape having arcuate ends at both ends, and the ratio of height to width in this cross-sectional shape is 2: 3 to 1: 5. Sheet. The invention according to claim 1 or 2, wherein the multifilament constituting the resin-processed multifilament thread is one or more selected from glass fiber, polyester fiber, polyamide fiber, polypropylene fiber, vinylon fiber, and vinyl chloride fiber. Transparent flexible sheet. The coarse lattice structure is 1) a woven fabric composed of warp / multifilament yarns and weft / multifilament yarns, or 2) warp / multifilament yarns and a 40 ° to 65 ° bias. Triaxial woven fabric composed of / multifilament yarn group, or 3) warp / multifilament yarn group, weft / multifilament yarn group, and 40 ° to 65 ° bias / multifilament yarn group. One selected from the epoxy-based resin, the styrene-based resin, and the acrylic-based resin, which is coated and filled with the vinyl chloride resin composition using any one selected from the quaternary woven fabric as a base material. The transparent flexible sheet according to any one of claims 1 to 3, which is transparently coated as described above and has an area of 25 mm ² to 111 mm ² per coarse lattice of the coarse lattice structure. .. The coarse lattice structure is a biaxial net in which 4) warp / resin-processed multifilament threads and weft / resin-processed multifilament threads are fixed at warp / weft intersections, or 5) warp / resin. A triaxial net in which a processed multifilament thread group and a 40 ° to 65 ° bias / resin processed multifilament thread group are fixed at a warp / bias intersection, or 6) a warp / resin processed multifilament thread group, weft. / Resin-processed multifilament thread group and 40 ° to 65 ° bias / Resin-processed multifilament thread group is one of the four-axis nets fixed at the warp / weft / bias intersection. In each case, the resin-processed multifilament thread was coated and filled with a vinyl chloride resin composition, and further transparently coated with one or more selected from the epoxy-based resin, styrene-based resin, and acrylic-based resin. The transparent flexible sheet according to any one of claims 1 to 3, wherein the area per coarse lattice is in the range of 100 mm ² to 2600 mm ² . The aromatic phosphate ester compound is one or more selected from tricresyl phosphate, triphenyl phosphate, trixylenyl phosphate, cresyldiphenyl phosphate, and 2-ethylhexyldiphenyl phosphate, and the vinyl chloride resin composition. The transparent flexible sheet according to any one of claims 1 to 5, which is 50 to 200% by mass with respect to the mass of the vinyl chloride resin in the product. The vinyl chloride resin composition is further composed of epoxidized soybean oil, epoxidized flaxseed oil, epoxidized fatty acid butyl, epoxidized fatty acid 2-ethylhexyl, epoxidized hexahydrophthalate 2-ethylhexyl, and epoxidized hexahydrophthalate diepoxystearyl. The transparent flexible sheet according to any one of claims 1 to 6, wherein one or more selected epoxy compounds are contained in an amount of 1 to 25% by mass based on the total amount of the aromatic phosphate ester compounds. The transparent resin sheet is composed of a vinyl chloride resin and a soft vinyl chloride resin mainly composed of a plasticizer, and the plasticizer is a phthalic acid dialkyl ester, an isophthalic acid dialkyl ester, a terephthalic acid dialkyl ester, a cyclohexanedicarboxylic acid dialkyl ester, and the like. The transparent flexible according to any one of claims 1 to 7, wherein the amount is 35 to 100% by mass based on the mass of the vinyl chloride resin, which is one or more selected from the cyclohexene dicarboxylic acid dialkyl ester. Sheet. On the surface (front side and / or back side) of the transparent resin sheet, acrylic resin, urethane resin, acrylic / silicon copolymer resin, fluorine-based copolymer resin, acrylic resin and fluorine-based copolymer resin Any of claims 1 to 8 provided with an antifouling layer composed of one or more coating films selected from a blend, a urethane / silicon-based graft copolymer resin, and a urethane / fluorine-based graft copolymer resin. The transparent flexible sheet according to item 1. On the outermost surface (front side and / or back side) of the transparent resin sheet, nanoparticles made of an inorganic colloidal substance having a primary particle diameter of 3 nm to 150 nm are a binder component containing a hydrolysis condensate of a silane coupling agent. An antistatic antifouling layer is provided, and the inorganic colloidal substance is a photocatalytic titanium oxide sol, a photocatalytic zinc oxide sol, a photocatalytic tin oxide sol, a titanium oxide sol, a zinc oxide sol, and a tin oxide sol. , Silica sol, aluminum oxide sol, zirconium oxide sol, cerium oxide sol, and one or more metal oxides selected from composite oxide (zinc oxide-antimonium pentoxide complex or tin oxide-antimonium pentoxide complex) sol. Item 2. The transparent flexible sheet according to any one of Items 1 to 8.

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