Glass cloth, prepreg, and printed wiring board

Abstract

To provide: a glass cloth, which achieves high productivity by winding the glass cloth without causing wrinkles even while transporting the glass cloth having low mass at high speed; and a prepreg and a printed wiring board using the same.SOLUTION: A glass cloth is formed by weaving a glass yarn formed of a plurality of glass filaments as warp and weft. Mass of the glass cloth is 11.5 g / m2 or less. The number of average weaving rows of the glass cloth is within a range of 3.0 to 5.0. An opening degree of the warp of the glass cloth is 0.55 to 0.90, while an open degree of the weft is 0.65 to 0.97.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a glass cloth, a prepreg, and a printed wiring board. [Background technology]

[0002] In recent years, with the miniaturization of electronic devices, there has been a strong demand for lighter printed wiring boards. To reduce the mass of materials used in printed wiring boards, there is also a demand for a lighter mass of the glass cloth contained in prepregs.

[0003] Methods for suppressing pinholes in prepregs using low-mass glass cloth have been reported (Patent Documents 1 to 4). In all of Patent Documents 1 to 4, pinholes occurring in prepregs are suppressed by controlling the degree of opening of the glass cloth or the gap spacing in the yarn width. Patent Document 5 reports a method for reducing warpage in printed wiring boards using low-mass glass cloth. Patent Document 6 discloses a method for controlling the surface glass yarn coverage rate, thereby achieving excellent dimensional stability and mechanical properties even in printed wiring boards using low-mass glass cloth. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6818278 [Patent Document 2] Patent No. 5905150 [Patent Document 3] Patent No. 6020764 [Patent Document 4] Patent No. 6536764 [Patent Document 5] Patent No. 6421755 [Patent Document 6] Patent No. 4446754 Summary of the Invention [Problem to be solved by the invention]

[0005] Because low-mass glass cloth and prepreg are thin, they are often prone to wrinkling when transported and processed in a roll-to-roll manner. Patent Document 1 also reports a method for suppressing both the occurrence of pinholes in prepreg and the occurrence of wrinkles (vertical wrinkles) running in the machine direction during production, but there is still room for improvement in suppressing wrinkles during glass cloth transport. Therefore, an object of the present invention is to provide a glass cloth with high productivity, as well as a prepreg and a printed wiring board using the same, by winding up a low-mass glass cloth without wrinkling even while transporting it at high speed. [Means for solving the problem]

[0006] As a result of studies to solve the above-mentioned problems, the present inventors have found that, in a low-mass glass cloth, the thinner the glass cloth, the more easily wrinkles are generated during roll-to-roll transport. Therefore, the present inventors have found that by reducing the degree of opening of the glass cloth to a level at which pinholes are not generated when the glass cloth is made into a prepreg, it is possible to increase the thickness of the glass cloth even with the same mass and wind it up without generating wrinkles during transport, thereby arriving at the present invention. Some aspects of the present invention are exemplified below. [1] A glass cloth made by weaving glass yarns consisting of a plurality of glass filaments as warp and weft yarns, and the mass of the glass cloth is 11.5 g / m 2 or less, wherein the average number of rows of the glass cloth is in the range of 3.0 to 5.0, and the opening degree of the warp yarns of the glass cloth is 0.55 to 0.90 and the opening degree of the weft yarns is 0.65 to 0.97. [2] Item 2. A glass cloth according to item 1, comprising warp yarns and weft yarns each formed by bundling 10 to 50 glass filaments having a diameter within a range of 2.5 μm to 4.0 μm, wherein the weave density of the warp yarns is within a range of 85 to 150 ends / inch and the weft yarns is within a range of 85 to 150 ends / inch. [3] 3. The glass cloth according to item 1 or 2, wherein the thickness of the glass cloth is in the range of 8 μm to 18 μm. [4] 4. The glass cloth according to any one of items 1 to 3, wherein an average degree of opening calculated from the degree of opening of the warp yarns and the degree of opening of the weft yarns is in the range of 0.60 to 0.93. [5] 5. The glass cloth according to any one of items 1 to 4, which has been surface-treated with a silane coupling agent. [6] The silane coupling agent is represented by the following general formula (1): X(R) 3-n SiY n ···(1) (In the formula, X represents an organic functional group having one or more amino groups, an organic functional group having one or more radically reactive unsaturated double bond groups, or an organic functional group having both one or more amino groups and one or more radically reactive unsaturated double bond groups; each Y represents independently an alkoxy group; n represents an integer of 1 to 3; and each R represents independently a group selected from the group consisting of a methyl group, an ethyl group, and a phenyl group.) Item 6. The glass cloth according to item 5, comprising a silane coupling agent represented by the formula: [7] A prepreg comprising the glass cloth according to any one of items 1 to 6, a thermosetting resin, and an inorganic filler. [8] Item 8. A printed wiring board comprising the prepreg according to item 7. [9] Item 9. An integrated circuit comprising the printed wiring board according to item 8.

[10] Item 9. An electronic device comprising the printed wiring board according to item 8. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a low-mass glass cloth that is suppressed from wrinkling during transportation and exhibits high productivity, as well as a prepreg and a printed wiring board that use the glass cloth. DETAILED DESCRIPTION OF THE INVENTION

[0008] Below, we will explain in detail the embodiment of the present invention (hereinafter referred to as the ``present embodiment''), but the present invention is not limited to this and various modifications are possible within the scope of the gist of the present invention.

[0009] [Glass cloth] The glass cloth of this embodiment is a glass cloth obtained by weaving glass yarns made of a plurality of glass filaments as warp and weft yarns. The glass cloth is preferably surface-treated with a surface treatment agent described below.

[0010] [Glass type] The glass cloth used in the laminate is usually glass called E glass (alkali-free glass), but the glass cloth of this embodiment may be, for example, L glass, NE glass, D glass, L2 glass, S glass, T glass, silica glass, quartz glass, etc. From the viewpoint of dielectric properties, L glass, L2 glass, silica glass, quartz glass, etc. are more preferably used, with silica glass and quartz glass being particularly preferred. Furthermore, from the viewpoint of improving the dimensional stability of the laminate containing the glass cloth, S glass, T glass, silica glass, and quartz glass are more preferably used, with silica glass and quartz glass being particularly preferred.

[0011] [Glass cloth properties and composition] The mass of the glass cloth in this embodiment is 11.5 g / m 2 The glass cloth has an average number of rows in the range of 3.0 to 5.0, and the glass cloth has a warp opening degree of 0.55 to 0.90 and a weft opening degree of 0.65 to 0.97.

[0012] The mass of the glass cloth of this embodiment is 11.5 g / m as the mass per unit area according to JIS R3420. 2 From the viewpoint of thinning the prepreg or printed wiring board containing the glass cloth, it is 11.3 g / m or less. 2 Less than 11.0 g / m 2 Less than 10.5 g / m is more preferable. 2 More preferably, 10.0 g / m 2 The lower limit of the mass per unit area of the glass cloth is not particularly limited, but is, for example, 0 g / m 2 Excess, 0.1g / m 2 The above is fine.

[0013] The average number of rows of the glass cloth in this embodiment is in the range of 3.0 to 5.0, preferably in the range of 3.2 to 4.7, more preferably in the range of 3.4 to 4.4, even more preferably in the range of 3.5 to 4.1, and particularly preferably in the range of 3.6 to 4.0. If the average number of rows is less than 3.0, the thickness of the glass cloth will be thin, and the glass cloth will be more likely to wrinkle during transport. On the other hand, if the average number of rows exceeds 5.0, the incidence of pinholes in the prepreg will increase. By setting the average number of rows of the glass cloth within the above range, it is possible to both suppress wrinkles during transport of the glass cloth and suppress pinholes in the prepreg.

[0014] In the glass cloth of this embodiment, the warp opening is in the range of 0.55 to 0.90, and the weft opening is in the range of 0.65 to 0.97; it is preferable that the warp opening is in the range of 0.60 to 0.89, and the weft opening is in the range of 0.70 to 0.96; it is more preferable that the warp opening is in the range of 0.65 to 0.88, and the weft opening is in the range of 0.75 to 0.95; it is even more preferable that the warp opening is in the range of 0.67 to 0.87, and the weft opening is in the range of 0.77 to 0.94; it is particularly preferable that the warp opening is in the range of 0.68 to 0.86, and the weft opening is in the range of 0.78 to 0.93. By setting the opening ratio of the warp and weft yarns of the glass cloth within the above range, it is possible to suppress both the occurrence of wrinkles in the glass cloth during transport and the occurrence of pinholes in the prepreg. If the opening ratio exceeds the upper limit, the glass cloth is likely to be wrinkled during transport due to the high opening ratio. On the other hand, if the opening ratio is below the lower limit, the occurrence rate of pinholes during prepreg production increases.

[0015] The average opening degree of the glass cloth of this embodiment is preferably in the range of 0.60 to 0.93, more preferably in the range of 0.62 to 0.93, even more preferably in the range of 0.64 to 0.92, even more preferably in the range of 0.66 to 0.92, and particularly preferably in the range of 0.67 to 0.91. By setting the average opening degree of the glass cloth in the above range, it is possible to both suppress wrinkles during conveyance of the glass cloth and suppress pinholes in the prepreg. The average opening degree of the glass cloth is expressed as the average value of the opening degrees of the warp yarns and the opening degrees of the weft yarns.

[0016] The mass of the glass cloth is 11.5 g / m 2To achieve the above, it is preferable that the glass yarns used for the warp and weft of the glass cloth are thin. The diameter of the glass filaments in this embodiment is preferably in the range of 2.5 μm to 4.0 μm, more preferably 2.8 μm to 3.9 μm, even more preferably 3.0 μm to 3.8 μm, and particularly preferably 3.1 μm to 3.7 μm. If the filament diameter is less than 2.5 μm, the filament breaking strength is low, and fluffing is likely to occur. On the other hand, if the filament diameter exceeds 4.0 μm, the mass of the glass cloth should be less than 11.5 g / m. 2 It becomes difficult to do the following:

[0017] The number of glass filaments used in the warp and weft of the glass cloth of this embodiment is preferably within a range of 10 to 50, more preferably within a range of 15 to 45, even more preferably within a range of 20 to 43, and particularly preferably within a range of 25 to 40. If the number of filaments exceeds 50, the expansion ratio tends to be insufficient when the glass cloth is subjected to flattening processing such as opening processing. If the number of filaments is less than 10, fluffing of the glass cloth tends to occur. Glass filaments within the above number range can be bundled in the formation of glass yarns.

[0018] From the viewpoint of the range in which the effects of the present invention are significantly exhibited, the weave density of the warp yarns of the glass cloth of this embodiment is preferably within the range of 85 to 150 ends / inch and the weave density of the weft yarns is preferably within the range of 85 to 150 ends / inch, and the weave densities of the warp yarns and weft yarns are more preferably within the range of 88 to 140 ends / inch, further preferably 90 to 135 ends / inch, and particularly preferably 95 to 130 ends / inch.

[0019] The thickness of the glass cloth in this embodiment is preferably in the range of 8 μm to 18 μm, more preferably 9 μm to 17 μm, even more preferably 9 μm to 16 μm, even more preferably 9 μm to 15 μm, and particularly preferably 10 μm to 15 μm. If the thickness of the glass cloth is less than 8 μm, the glass cloth loses its stiffness and is prone to wrinkles during transport. If the thickness of the glass cloth exceeds 18 μm, the glass cloth has an insufficient expansion ratio, and pinholes are prone to occur in the prepreg.

[0020] [Surface treatment agent (silane coupling agent)] The glass fibers (including glass filaments) constituting the glass cloth are preferably surface-treated with a surface treatment agent such as a silane coupling agent. Examples of the silane coupling agent include those represented by the following general formula (1): X(R) 3-n SiY n ···(1) In formula (1), X represents an organic functional group having one or more amino groups, an organic functional group having one or more radically reactive unsaturated double bond groups, or an organic functional group having both one or more amino groups and one or more radically reactive unsaturated double bond groups; each Y represents independently an alkoxy group; n represents an integer of 1 to 3; and each R represents independently a group selected from the group consisting of a methyl group, an ethyl group, and a phenyl group. It is preferable to use a silane coupling agent represented by the following formula:

[0021] X in the general formula (1) above may be, for example, an organic functional group having at least one radically reactive unsaturated double bond group, such as a radically reactive carbon-carbon double bond, an organic functional group having at least one amino group, or an organic functional group having both at least one radically reactive unsaturated double bond group and at least one amino group. The amino group may be, for example, a primary amino group, a secondary amino group, a tertiary amino group, or a quaternary ammonium salt. Regarding Y in the general formula (1) above, any form of alkoxy group can be used, but for stabilizing the treatment of glass cloth, an alkoxy group having 5 or less carbon atoms is preferred.

[0022] As the surface treatment agent, the silane coupling agent represented by general formula (1) may be used alone, or two or more silane coupling agents having different X's in general formula (1) may be used in combination. Examples of the silane coupling agent represented by general formula (1) include N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane and its hydrochloride, N-β-(N-vinylbenzylaminoethyl)-γ-aminopropylmethyldimethoxysilane and its hydrochloride, N-β-(N-di(vinylbenzyl)aminoethyl)-γ-aminopropyltrimethoxysilane and its hydrochloride, N-β-(N-di(vinylbenzyl)aminoethyl)-N-γ-(N-vinylbenzyl)-γ-aminopropyltrimethoxysilane and its hydrochloride, Examples thereof include known simple substances such as hydrochloride, N-β-(N-benzylaminoethyl)-γ-aminopropyltrimethoxysilane and its hydrochloride, N-β-(N-benzylaminoethyl)-γ-aminopropyltriethoxysilane and its hydrochloride, γ-(2-aminoethyl)aminopropyltrimethoxysilane, γ-(2-aminoethyl)aminopropyltriethoxysilane, aminopropyltrimethoxysilane, vinyltrimethoxysilane, methacryloxypropyltrimethoxysilane, and acryloxypropyltrimethoxysilane, or mixtures thereof.

[0023] The surface treatment method for the glass cloth of this embodiment is not particularly limited, but may include, for example, a method including a coating step of coating the surface of the glass filaments with a treatment liquid containing a silane coupling agent, and a fixing step of fixing the silane coupling agent to the surface of the glass filaments by heating and drying. The treatment liquid preferably contains 0.1 wt % to 3.0 wt % of the silane coupling agent. It is preferable that the surface of the glass filaments is almost completely covered with the silane coupling agent by the coating step.

[0024] Possible methods for applying the treatment liquid to the glass cloth include (a) a method in which the treatment liquid is collected in a bath and the glass cloth is immersed in the treatment liquid and passed through the bath (hereinafter referred to as the "immersion method"), and (b) a method in which the treatment liquid is directly applied to the glass cloth using a roll coater, a die coater, a gravure coater, etc. When applying the treatment liquid using the immersion method (a), it is preferable to select the immersion time of the glass cloth in the treatment liquid to be 0.5 seconds or more and 1 minute or less.

[0025] The heating and drying temperature is preferably 90°C or higher, more preferably 100°C or higher, so that the reaction between the silane coupling agent and the glass is sufficiently carried out, and is preferably 300°C or lower, more preferably 200°C or lower, so as to prevent deterioration of the organic functional groups of the silane coupling agent.

[0026] The surface treatment method for glass cloth according to the present embodiment may include an adjusting step of adjusting the amount of the silane coupling agent adhered to the surface of the glass filaments by washing at least a portion of the silane coupling agent with a washing liquid such as water. The washing can be performed with a high-pressure spray of water or the like.

[0027] As the solvent for dissolving or dispersing silane coupling agent, water or organic solvent can be used, and from the viewpoint of safety and global environmental protection, it is preferable to use water as the main solvent.As the method for obtaining the treatment solution that uses water as the main solvent, it is preferable to either directly add silane coupling agent to water, or to dissolve silane coupling agent in a water-soluble organic solvent to form an organic solvent solution, and then add this organic solvent solution to water.In order to improve the water dispersibility or stability of silane coupling agent in the treatment solution, it is also possible to use surfactant in combination.

[0028] The above-mentioned coating step, fixing step, and preparing step are preferably carried out on the glass cloth after the weaving step. Furthermore, if necessary, a fiber-opening step for opening the glass yarns of the glass cloth may be carried out after the weaving step. When the preparing step is carried out after the weaving step, the preparing step may also serve as the fiber-opening step. Note that the composition of the glass cloth usually does not change before and after fiber-opening. It is believed that the above-mentioned manufacturing method can form a silane coupling agent layer almost completely and uniformly on the entire surface of each glass filament constituting the glass yarn.

[0029] [Opening process] The method for opening the glass cloth is not particularly limited, but examples thereof include methods of opening the glass cloth with spray water (high-pressure water opening), a vibro washer, ultrasonic water, a mangle, etc. In order to prevent a decrease in the tensile strength of the glass cloth due to the opening process, it is preferable to take measures such as reducing the friction of contact members when weaving the glass yarns, or optimizing the sizing agent and increasing the amount of adhesion.

[0030] The water pressure for high-pressure water spreading of the glass cloth of this embodiment is preferably 0.13 MPa or less, more preferably 0.12 MPa or less, even more preferably 0.11 MPa or less, and even more preferably 0.10 MPa or less. If the water pressure for high-pressure water spreading exceeds 0.13 MPa, the yarn width of the glass cloth increases, making it impossible to suppress wrinkling during high-speed transport.

[0031] Furthermore, during the opening process, increasing the tension applied to the glass cloth can narrow the yarn width of the glass cloth, while decreasing the tension tends to widen the yarn width of the glass cloth. The tension applied to the glass cloth in the longitudinal direction in this embodiment is preferably 50 N or more, more preferably 60 N or more, even more preferably 70 N or more, and even more preferably 80 N or more, for a glass cloth with a width of 1,300 mm. The upper limit of the tension applied to the glass cloth in the longitudinal direction is not particularly limited as long as it is within a range in which the glass cloth is not broken or wrinkled. If the tension in the longitudinal direction is less than 50 N, the yarn width of the glass cloth is likely to widen, and wrinkles cannot be suppressed during high-speed transport.

[0032] [Prepreg] A prepreg according to one embodiment of the present invention can be produced by a conventional method. For example, the glass cloth described above can be impregnated with a thermosetting resin varnish (hereinafter simply referred to as "varnish") prepared by diluting a matrix resin such as an epoxy resin with an organic solvent, and then the organic solvent is evaporated in a drying oven to cure the thermosetting resin to the B stage (semi-cured state), thereby producing a prepreg. The amount of matrix resin attached to the glass cloth is preferably such that the mass of the varnish solids is 20% to 80% by mass of the total mass of the varnish solids and the glass cloth.

[0033] Examples of matrix resins used in the prepreg of the present invention include thermosetting resins such as epoxy resin, unsaturated polyester resin, polyimide resin, bismaleimide triazine (BT) resin, and cyanate resin, thermoplastic resins such as polyphenylene oxide (PPO) resin, polyetherimide resin, and fluororesin, and mixtures of these resins. Resins containing inorganic fillers such as aluminum hydroxide, talc, and silica filler may also be used.

[0034] Furthermore, a printed wiring board including a prepreg configured as described above is also one aspect of the present invention, and an integrated circuit and an electronic device including the printed wiring board can be provided. [Example]

[0035] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0036] [Physical properties of glass cloth] The physical properties of the glass cloth, specifically, the thickness of the glass cloth, the mass of the warp and weft, the diameter of the filaments constituting the warp and weft, and the weaving density of the warp and weft were measured in accordance with JIS R3420.

[0037] [Number of warp and weft filaments] The cross section of the yarn was observed, the number of filaments was counted, and the average value of five measurements was calculated.

[0038] [Warp width and weft width of glass cloth] Five glass cloth pieces each measuring 70 mm in the warp direction and 70 mm in the weft direction were cut out from the glass cloths obtained in the Examples and Comparative Examples to serve as test pieces for measuring yarn bundle. The test piece for measuring the yarn bundle was observed vertically using a macroscope at a magnification of 100. For each test piece, the yarn widths of 250 warp yarns were measured at random, and the average value of the obtained yarn widths of the 250 warp yarns was calculated and used as the warp width. Similarly, for each test piece, the widths of 250 weft yarns were measured at random, and the average value of the widths of the 250 weft yarns obtained was calculated, and this average value was defined as the weft width.

[0039] [Glass cloth opening rate] The opening degree of the warp and weft of the glass cloth was calculated using the following formula. Warp opening rate = warp width [μm] ÷ (number of warp filaments × warp filament diameter [μm]) Weft opening rate = weft width [μm] ÷ (number of weft filaments × weft filament diameter [μm]) The average opening degree of the glass cloth was determined as the average value of the opening degrees of the warp and weft yarns.

[0040] [Average number of layers of glass cloth] The average number of layers of the glass cloth was calculated using the following formula. Average number of rows = thickness of glass cloth [μm] ÷ (average diameter of warp and weft filaments [μm])

[0041] [Boron content in glass cloth] The boron content in the glass cloth was determined by ICP atomic emission spectroscopy. For the ICP atomic emission spectroscopy, a PS3520VDDII manufactured by Hitachi High-Tech Science Corporation was used. Specifically, the boron content was determined by weighing a glass cloth sample, fusing it with sodium carbonate, dissolving it in dilute nitric acid to a constant volume, and measuring the boron content in the sample by ICP atomic emission spectroscopy.

[0042] [Evaluation of wrinkles occurring during glass cloth transport] A glass cloth having a product width of 1300 mm and a cloth length of 2000 m was wound around a resin core tube having an outer diameter of 300 mm under the following conditions at a transport speed of 60 m / min. The occurrence of wrinkles during this process was evaluated. <Winding conditions> Conveying speed = 60 m / min Winding tension=300N Tension taper = 40% Winding pressure = 30 MPa Contact pressure taper = 0% <Wrinkle evaluation> 〇: No wrinkles occurred during winding △: Wrinkles occurred less than twice during winding ×: Wrinkles occurred three or more times during winding, or wrinkles occurred throughout winding

[0043] [Method for producing prepreg] A mixture of 80 parts by mass of low-brominated bisphenol A epoxy resin, 20 parts by mass of cresol novolac epoxy resin, 2 parts by mass of dicyandiamide, 0.2 parts by mass of 2-ethyl-4-methylimidazole, and 100 parts by mass of 2-methoxyethanol was mixed. The prepreg was coated by conveying glass cloth at a speed of 3 m / min, immersing the glass cloth in epoxy resin varnish, scraping off excess varnish through a slit whose gap was adjusted so that the resin content was 68% by mass, and then drying at 170°C for 1 minute and 30 seconds.

[0044] [Evaluation of pinhole occurrence rate] The obtained prepreg was sampled to a size of 400 mm x 400 mm. After sampling a total of 150 prepregs of the above size, the number of pinholes was counted by visual inspection, and prepregs with four or fewer pinholes per prepreg were considered to be good products, and the rate of good products among the 150 prepregs was evaluated.

[0045] Example 1 A 1300 mm wide greige glass cloth was woven using an air jet loom with a warp density of 105 warp threads / inch and a weft density of 110 weft threads / inch using silica glass yarns with an average filament diameter of 3.6 μm, 38 filaments, and a twist of 1.0 μm as the warp and silica glass yarns with an average filament diameter of 3.6 μm, 38 filaments, and a twist of 1.0 μm. The glass cloth was deoiled by heating at 400°C for 30 hours, immersed in a treatment solution prepared by dispersing N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (manufactured by Toray Dow Corning Co., Ltd.; Z6032) in water, and then heated and dried. Next, the cloth was spun in water at a frequency of 25 kHz and an output of 0.25 W / cm. 2 The opening process was carried out using an opening machine that irradiates ultrasonic waves (tension in the warp direction during opening process: 120 N). The glass cloth obtained after opening process had a warp width of 82 μm and a weft width of 94 μm.

[0046] Example 2 The greige glass cloth obtained in Example 1 was used and processing was carried out in the same manner as in Example 1, except that opening processing was carried out using high-pressure water opening (water pressure: 0.09 MPa, tension in the warp direction during opening processing: 120 N) instead of ultrasonic opening. The obtained glass cloth after opening processing had a warp width of 119 μm and a weft width of 127 μm.

[0047] Example 3 The greige glass cloth obtained in Example 1 was used and processed in the same manner as in Example 1, except that opening processing was carried out using high-pressure water opening (water pressure: 0.05 MPa, tension in the warp direction during opening processing: 90 N) instead of ultrasonic opening. The obtained glass cloth after opening processing had a warp width of 104 μm and a weft width of 116 μm.

[0048] Example 4 A 1300mm wide greige glass cloth was woven using an air jet loom with a warp density of 110 warp threads / inch and a weft density of 110 weft threads / inch using silica glass yarns with an average filament diameter of 3.5μm, 40 filaments, and a twist of 1.0Z. The warp yarns were made of silica glass yarns with an average filament diameter of 3.5μm, 40 filaments, and a twist of 1.0Z. The weft ... then heated to 400°C for 30 hours to deoil the glass cloth, which was then immersed in a water-dispersed solution of N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Toray Dow Corning Co., Ltd.) and dried by heating. The glass cloth was then opened using high-pressure water (water pressure: 0.05MPa, tension in the warp direction during opening: 90N). The resulting glass cloth after fiber opening had a warp width of 104 μm and a weft width of 123 μm.

[0049] Example 5 A 1300mm wide greige glass cloth was woven using an air jet loom with a warp density of 96 warp threads / inch and a weft density of 96 weft threads / inch using silica glass warp yarns with an average filament diameter of 4.0μm, 40 filaments, and a twist of 1.0Z. The warp yarns were made of silica glass yarns with an average filament diameter of 4.0μm, 40 filaments, and a twist of 1.0Z. The weft ... then heated to 400°C for 30 hours to deoil the glass cloth, which was then immersed in a water-dispersed solution of N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Toray Dow Corning Co., Ltd.) and dried by heating. The cloth was then opened using high-pressure water (water pressure: 0.05MPa, tension in the warp direction during opening: 100N). The resulting glass cloth after fiber opening had a warp width of 128 μm and a weft width of 142 μm.

[0050] Example 6 E-glass warp yarns with an average filament diameter of 3.6 μm, 38 filaments, and 1.0Z twist were used, and E-glass weft yarns with an average filament diameter of 3.6 μm, 38 filaments, and 1.0Z twist were used. A 1300 mm wide greige glass cloth was woven using an air jet loom at a weave density of 105 warp threads / inch and 110 weft threads / inch. The glass cloth was thermally deoiled at 400°C for 30 hours, immersed in a treatment solution containing N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Dow Corning Toray Co., Ltd.) dispersed in water, and then heated and dried. The cloth was then opened using high-pressure water (water pressure: 0.05 MPa, tension in the warp direction during opening: 100 N). The resulting glass cloth after fiber opening had a warp width of 104 μm and a weft width of 116 μm.

[0051] Example 7 E-glass warp yarns with an average filament diameter of 4.0 μm, 40 filaments, and 1.0Z twist were used, and E-glass weft yarns with an average filament diameter of 4.0 μm, 40 filaments, and 1.0Z twist were used. A 1300 mm wide greige glass cloth was woven using an air jet loom at a weave density of 96 warp threads / inch and 96 weft threads / inch. The glass cloth was thermally deoiled at 400°C for 30 hours, immersed in a treatment solution containing N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Toray Dow Corning Co., Ltd.) dispersed in water, and then heated and dried. The cloth was then opened using high-pressure water (water pressure: 0.06 MPa, tension in the warp direction during opening: 100 N). The resulting glass cloth after fiber opening had a warp width of 117 μm and a weft width of 138 μm.

[0052] Example 8 E-glass warp yarns with an average filament diameter of 4.0 μm, 40 filaments, and 1.0Z twist were used, and E-glass weft yarns with an average filament diameter of 4.0 μm, 50 filaments, and 1.0Z twist were used. A 1300 mm wide greige glass cloth was woven using an air jet loom at a weave density of 96 warp threads / inch and 96 weft threads / inch. The glass cloth was thermally deoiled at 400°C for 30 hours, immersed in a treatment solution containing N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Toray Dow Corning Co., Ltd.) dispersed in water, and then heated and dried. Next, the cloth was opened using high-pressure water (water pressure: 0.10 MPa, tension in the warp direction during opening: 90 N). The resulting glass cloth after fiber opening had a warp width of 144 μm and a weft width of 190 μm.

[0053] Example 9 A 1300mm wide greige glass cloth was woven using an air jet loom with a warp density of 96 warp threads / inch and a weft density of 96 weft threads / inch using a warp yarn (15% boron content) with an average filament diameter of 4.0μm, 40 filaments, and a twist count of 1.0Z. The warp yarn was a low-dielectric glass yarn (15% boron content) with an average filament diameter of 4.0μm, 40 filaments, and a twist count of 1.0Z. The weft yarn was a low-dielectric glass yarn (15% boron content) with an average filament diameter of 4.0μm, 40 filaments, and a twist count of 1.0Z. The glass cloth was deoiled by heating at 400°C for 30 hours, immersed in a water-dispersed solution of N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Toray Dow Corning Co., Ltd.), and then heated and dried. The cloth was then opened using high-pressure water (water pressure: 0.08MPa, tension in the warp direction during opening: 90N). The resulting glass cloth after fiber opening had a warp width of 126 μm and a weft width of 150 μm.

[0054] (Comparative Example 1) Fiber-opening processing was carried out in the same manner as in Example 1, except that fiber-opening processing was carried out using high-pressure water (water pressure: 0.15 MPa, tension in the warp direction during fiber-opening processing: 120 N) instead of ultrasonic fiber-opening processing. The obtained glass cloth after fiber-opening processing had a warp width of 128 μm and a weft width of 139 μm.

[0055] (Comparative Example 2) Spreading was carried out in the same manner as in Example 4, except that the spreading was carried out using high-pressure water spreading (water pressure: 0.15 MPa, tension in the warp direction during spreading: 120 N). The obtained glass cloth after spreading had a warp width of 137 μm and a weft width of 149 μm.

[0056] (Comparative Example 3) E-glass warp yarns with an average filament diameter of 3.6 μm, 40 filaments, and 0.5Z twist were used, and E-glass weft yarns with an average filament diameter of 3.6 μm, 40 filaments, and 0.5Z twist were used. A 1300 mm wide greige glass cloth was woven using an air jet loom at a weave density of 107 warp threads / inch and 107 weft threads / inch. The cloth was then heated at 400°C for 30 hours to remove the sizing agent. A silane coupling agent (S-350: N-vinylbenzyl-aminoethyl-γ-aminopropyltrimethoxysilane (hydrochloride), Chisso Corporation) was added as a surface treatment agent, adjusted to a concentration of 10 g / L, and squeezed with a padder roll. The cloth was then dried and cured at 120°C for 1 minute. The glass cloth was subjected to a water jet processing at a pressure of 1.0 MPa, with the tension of the glass cloth in the warp direction being 20 N / m, and while both ends of the glass cloth in the weft direction were held with a tenter, a tension of 5 to 10 N / m was also applied in the weft direction to perform an opening process, thereby producing a glass cloth roll product. The obtained glass cloth after the opening process had a warp width of 131 μm and a weft width of 161 μm.

[0057] Comparative Example 4 Processing was carried out in the same manner as in Comparative Example 1, except that the number of warp and weft filaments was 40, and that the glass cloth was subjected to opening treatment by water jet processing at a pressure of 0.5 MPa, with the tension of the glass cloth in the warp direction being 20 N / m, and also applying a tension of 5 to 10 N / m in the weft direction while holding both ends of the glass cloth in the weft direction with tenters. The obtained glass cloth after opening processing had a warp width of 111 μm and a weft width of 144 μm.

[0058] (Comparative Example 5) E-glass warp yarns with an average filament diameter of 4.0 μm, 50 filaments, and 1.0Z twist were used, and E-glass weft yarns with an average filament diameter of 4.0 μm, 50 filaments, and 1.0Z twist were used. A 1300 mm wide greige glass cloth was woven using an air jet loom at a weave density of 95 warp threads / inch and 95 weft threads / inch. The glass cloth was thermally deoiled at 400°C for 30 hours, immersed in a treatment solution containing N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane hydrochloride (Z6032, manufactured by Toray Dow Corning Co., Ltd.) dispersed in water, and then heated and dried. Next, the cloth was opened using high-pressure water (water pressure: 0.30 MPa, tension during opening: 100 N). The resulting glass cloth had a warp width of 140 μm and a weft width of 215 μm.

[0059] (Comparative Example 6) In the fiber-opening process, instead of spraying, a tension of 15 N was applied in the weft direction and 20 N in the warp direction, and the fibers were subjected to a frequency of 25 kHz and an output of 0.72 W / cm in water. 2 A glass cloth product for evaluation was obtained in the same manner as in Comparative Example 5, except that an ultrasonic wave was used to apply tension in the weft direction using an expander roll. The warp width of the obtained glass cloth after the opening process was 150 μm and the weft width was 125 μm.

[0060] (Comparative Example 7) A glass cloth product for evaluation was obtained in the same manner as in Example 1, except that the tension in the warp direction during opening processing was set to 20 N. The obtained glass cloth after opening processing had a warp width of 123 μm and a weft width of 138 μm.

[0061] (Comparative Example 8) A glass cloth product for evaluation was obtained in the same manner as in Example 2, except that the tension in the warp direction during opening processing was set to 20 N. The obtained glass cloth after opening processing had a warp width of 126 μm and a weft width of 141 μm.

[0062] The measurement results and evaluation results are shown in Tables 1 and 2.

[0063]

Table 1

[0064]

Table 2

Claims

1. A glass cloth woven by using glass yarns consisting of a plurality of glass filaments as warp and weft yarns, wherein the mass of the glass cloth is 11.0 g / m ２ or less, wherein the average number of rows of the glass cloth is within a range of 3.0 to 5.0, and the opening degree of the warp yarns of the glass cloth is 0.55 to 0.90 and the opening degree of the weft yarns is 0.65 to 0.

94.

2. 2. The glass cloth according to claim 1, which is composed of warp yarns and weft yarns each formed by bundling 10 to 50 glass filaments having a diameter within a range of 2.5 μm to 4.0 μm, and the weaving density of the warp yarns is within a range of 85 to 150 ends / inch, and the weaving density of the weft yarns is within a range of 85 to 150 ends / inch.

3. 3. The glass cloth according to claim 1, wherein the thickness of the glass cloth is in the range of 8 μm to 18 μm.

4. The glass cloth according to any one of claims 1 to 3, wherein an average degree of opening, which is expressed as an average value of the degree of opening of the warp yarns and the degree of opening of the weft yarns, is in the range of 0.60 to 0.

93.

5. The glass cloth according to any one of claims 1 to 4, which has been surface-treated with a silane coupling agent.

6. The silane coupling agent is represented by the following general formula (1): X (R) ３－ｎ Yes ｎ ・・・(1) (In the formula, X represents an organic functional group having one or more amino groups, an organic functional group having one or more radically reactive unsaturated double bond groups, or an organic functional group having both one or more amino groups and one or more radically reactive unsaturated double bond groups; each Y represents independently an alkoxy group; n represents an integer of 1 to 3; and each R represents independently a group selected from the group consisting of a methyl group, an ethyl group, and a phenyl group.) The glass cloth according to claim 5, which contains a silane coupling agent represented by the formula:

7. A prepreg comprising the glass cloth according to any one of claims 1 to 6, a thermosetting resin, and an inorganic filler.

8. A printed wiring board comprising the prepreg according to claim 7.

9. An integrated circuit comprising the printed wiring board of claim 8.

10. An electronic device comprising the printed wiring board according to claim 8.

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