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CN-118265822-B - Glass cloth, method for producing glass cloth, prepreg, and printed wiring board

CN118265822BCN 118265822 BCN118265822 BCN 118265822BCN-118265822-B

Abstract

The invention provides a glass cloth, which is woven by taking glass yarns containing a plurality of glass filaments as warp yarns and weft yarns and carrying out surface treatment by using a surface treatment agent, wherein the glass cloth comprises a specified area, wherein the area is represented by the following formula (1)/(E1/T1)/(W1/L1) & gt, wherein E1 represents the 2 nd bending rigidity of a curvature of 2.5cm ‑1 when bending for the 2 nd time, the curvature of 0.5 cm to +1.5cm ‑1 is represented by N cm 2 /cm, T1 represents the thickness of the area, L1 represents the driving interval of the warp yarns is represented by cm, W1 represents the width of the warp yarns is represented by cm, and the unit is cm, and the valley bottom line generated by bending is bent in a mode of making the valley bottom line generated by bending along the weft yarn direction.

Inventors

  • Fukaya yasuka

Assignees

  • 旭化成株式会社

Dates

Publication Date
20260512
Application Date
20221111
Priority Date
20211118

Claims (19)

  1. 1. A glass cloth which is woven by using glass yarns containing a plurality of glass filaments as warp yarns and weft yarns and is subjected to surface treatment by using a surface treatment agent, wherein, The glass cloth comprises a specified area, The following formula (1) of the region: (E1/T1)/(W1/L1) is greater than 0 and less than 0.14, Wherein E1 represents a bending stiffness of 2 nd times per unit length of between 0.5 to +1.5cm -1 at a bending of 2.5cm -1 at 2 nd times in N.cm 2 /cm, T1 represents the thickness of the region, in cm, L1 represents the driving interval of the warp yarn, the unit is cm, W1 represents the width of the warp yarn, the unit is cm, The bottom line of the valley generated by the bending is bent in such a manner as to be along the weft direction.
  2. 2. The glass cloth according to claim 1, wherein, The formula (1) is greater than 0 and not more than 0.13.
  3. 3. The glass cloth according to claim 1, wherein, The thickness T1 of the region is 0.002-0.013 cm.
  4. 4. The glass cloth according to claim 1, wherein, The driving interval L1 of the warp yarn is 0.021-0.25 cm.
  5. 5. The glass cloth according to claim 1, wherein, The amount of particles adhering to the region is 100 particles/μm or less.
  6. 6. The glass cloth according to claim 1, wherein, The surface treatment agent comprises a silane coupling agent having a free-radically reactive unsaturated double bond.
  7. 7. The glass cloth according to claim 1, wherein, The number of fluff of 1mm or more in length observed when 100N/1000mm tension is applied by roll-to-roll is 10 pieces/m 2 or less and the weft slope of the weft yarn is 4% or less.
  8. 8. The glass cloth according to claim 1, wherein, The glass cloth comprises a region satisfying the following formula (2), namely (E2/T2)/(W2/L2) & gt (2) being more than 0 and less than 0.14, Wherein E2 represents the 2 nd bending stiffness per unit length between 0.5 to +1.5cm -1 at the 2 nd bending of -1 at a curvature of 2.5cm, in N.cm 2 /cm, T2 represents the thickness of the region, in cm, L2 represents the driving interval of the weft yarn, the unit is cm, W2 represents the weft yarn width, in cm, The bottom line of the valley generated by the bending is bent in such a manner as to follow the warp direction.
  9. 9. The glass cloth according to claim 8, wherein, The formula (2) is greater than 0 and not more than 0.13.
  10. 10. The glass cloth according to claim 8, wherein, The thickness T2 of the region is 0.002-0.013 cm.
  11. 11. The glass cloth according to claim 8, wherein, The driving interval L2 of the weft yarn is 0.021-0.25 cm.
  12. 12. The glass cloth according to claim 1, wherein, The amount of particles attached to the region was 0 particles/μm.
  13. 13. The glass cloth of claim 12, wherein, The particles are inorganic particles and/or organic particles having a diameter of 3 μm or less.
  14. 14. The glass cloth of claim 13, wherein, The inorganic fine particles are at least one selected from the group consisting of colloidal silica, crystalline silica, alumina and boron nitride, The organic microparticles are at least one selected from the group consisting of polyphenylene ether resin, epoxy resin, and styrene-based elastomer.
  15. 15. The glass cloth according to claim 8, wherein, The L1 and L2 and/or the W1 and W2 have anisotropies, the values of the anisotropies of the L1 and L2 are different values, and the values of the anisotropies of the W1 and W2 are different values.
  16. 16. A prepreg, wherein the prepreg is prepared from a resin, The prepreg has the glass cloth according to any one of claims 1 to 15 and a matrix resin composition impregnated into the glass cloth.
  17. 17. A printed circuit board, wherein, The printed circuit board has the glass cloth according to any one of claims 1 to 15 and a cured product of the matrix resin composition impregnated in the glass cloth.
  18. 18. A method for producing a glass cloth according to claim 1, wherein, The method for manufacturing the glass cloth comprises a step of blowing dry ice particles to perform a fiber opening process.
  19. 19. The method for producing glass cloth according to claim 18, wherein, The fiber-opening processing is performed by bending with a radius of curvature of 2.5mm or less.

Description

Glass cloth, method for producing glass cloth, prepreg, and printed wiring board Technical Field The invention relates to a glass cloth, a method for manufacturing the glass cloth, a prepreg, and a printed circuit board. Background As a base material for a printed circuit board of an electronic device, glass cloth is widely used. In recent years, with the increase in performance and high-speed communication of information terminals such as smart phones, the reduction in dielectric properties (for example, the reduction in dielectric constant and the reduction in dielectric loss tangent) of printed circuit boards has been advanced. In order to meet the demand for low dielectric characteristics of printed wiring boards, a method has been employed in which a material constituting a base material is a glass cloth treated with a silane coupling agent, a low dielectric resin such as polyphenylene ether (hereinafter also referred to as "matrix resin"), or the like, and the glass cloth is impregnated with the low dielectric resin. Since low dielectric resins such as polyphenylene ether tend to have a higher viscosity than conventionally known epoxy resins and the like, resin-non-impregnated portions (voids; void) of glass fiber yarn bundles in a substrate are easily formed, and CAF (conductive anode wire; conductive Anodic Filaments) is easily a problem. Therefore, it is necessary to further improve the CAF resistance by further improving the resin impregnation property. In general, the improvement of the impregnation property of a resin with respect to a glass cloth is carried out in such a manner that the glass cloth is subjected to a fiber opening process by a method using a columnar flow or a spray flow, a method using a vibration washer, a method using high-frequency vibration with a liquid as a medium, or the like. As a method for improving the resin impregnation property, a method of immersing a glass cloth in a liquid containing colloidal silica to open the fiber (see patent document 1), a method of using a liquid containing colloidal silica as a glass fiber bundling agent (see patent document 2), and a method of immersing a glass cloth in an aqueous dispersion of resin fine particles and elastomer fine particles (see patent document 3) have been proposed. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2010-84236 Patent document 2 Japanese patent laid-open No. 9-208268 Patent document 3 Japanese patent application laid-open No. 2018-115225 Disclosure of Invention Problems to be solved by the invention Regarding glass cloths, there is a background that there is a strong demand for further improvement of the impregnation property with respect to low dielectric resins having high viscosity such as polyphenylene ether. In the methods described in patent documents 1 to 3, although nanoparticles are attached to glass cloth, there is a concern that nanoparticles are harmful to the environment and the human body in general, and therefore, it is desirable that nanoparticles such as colloidal silica are not contained. That is, in the methods described in patent documents 1 to 3, there is room for improvement from the viewpoints of environmental and human burden. The present invention has been made in view of the above problems, and an object of the present invention is to provide a glass cloth which has a small burden on the environment and the human body and can obtain good impregnation with a low dielectric resin. The present invention also provides a prepreg and a printed wiring board using the glass cloth. Solution for solving the problem The present inventors have studied to solve the above problems, and as a result, have found that the above problems can be solved by providing a specific region on a glass cloth, and have completed the present invention. Namely, an embodiment of the present invention is as follows. [1] A glass cloth comprising glass yarns comprising a plurality of glass filaments, which are woven as warp yarns and weft yarns and are surface-treated with a surface treatment agent, wherein the glass cloth comprises a prescribed region represented by the following formula (1): (E1/T1)/(W1/L1): (1) is more than 0 and 0.14 or less, wherein E1 represents the 2 nd bending stiffness per unit length between 0.5 to +1.5cm -1 at the 2 nd bending of 2.5cm -1 in N.cm 2/cm, T1 represents the thickness of the region, in cm, L1 represents the driving interval of the warp yarn, the unit is cm, W1 represents the width of the warp yarn, the unit is cm, The bottom line of the valley generated by the bending is bent in such a manner as to be along the weft direction. [2] The glass cloth according to claim 1, wherein the formula (1) is greater than 0 and not more than 0.13. [3] The glass cloth according to claim 1 or 2, wherein the thickness T1 of the region is 0.002 to 0.013cm. [4] The glass cloth according to any one of claims 1 to 3, wherein the warp yarn driving