JP2005336694A - Blended glass yarn and glass cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass yarn which can improve the electric characteristics and thermal characteristics of a glass cloth used for printed circuit boards, and is used for high frequency used for high frequency circuits exceeding 1 GHz, especially ultrahigh frequency circuits exceeding 10 GHz, and for low expanding printed circuit boards corresponding to flip chips, and to provide a glass cloth. <P>SOLUTION: This blended glass yarn comprising quartz glass filaments and one or more kinds of non-quartz glass filaments different from the quartz glass filaments is characterized in that the ratio (B/A) of the weight B of the non-quartz glass filaments to the weight A of the quartz glass filaments is 0.1 to 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mixed fiber glass yarn and a glass cloth, and more particularly to a glass yarn and a glass cloth that are suitably used for a printed wiring board.

  Conventionally, it is common to use a glass cloth using a specific kind of glass such as E glass, D glass or NE glass as an insulating substrate of a printed wiring board. A thermosetting resin or the like is used on the glass cloth. An impregnated and heat-pressed laminate is produced. However, in recent years, the speed of printed wiring boards used in computers and peripheral devices has increased along with the increase in the speed of semiconductor elements, and with the rapid spread of the Internet and mobile phones, high-speed and large-capacity transmission of communication and broadcasting equipment Therefore, these multilayer printed wiring boards are also required to improve high-frequency characteristics. In particular, problems of loss and delay in a high-frequency region exceeding 1 GHz have been attracting attention.

  In addition, the wire bonding method has generally been used as a method for mounting semiconductor elements, but it has become difficult to cope with the wire bonding method as the wiring pitch becomes narrower, the electrodes become finer, and the information processing speed increases. ing. Instead of this method, a flip chip method for connecting an element and a substrate by using bump electrodes called bumps has been used. In the flip chip method, it is assumed that if there is a significant difference in the coefficient of thermal expansion between the element and the printed wiring board, it may cause wiring defects.

In order to improve electrical characteristics and thermal characteristics, cloth using glass fibers having a specific glass composition (for example, see Patent Documents 1 and 2), cloth woven with glass fiber threads and organic fiber threads (patents) Document 3), a cloth composed of a glass yarn made of E glass and a glass yarn having a special glass composition (Patent Document 4), and a cloth using one of warp and weft as E glass and the other as D glass (Patent Document 5) However, it is difficult to satisfy excellent electrical and thermal characteristics at low cost. A cloth using quartz glass fiber has also been proposed (Patent Document 6). However, the quartz glass fiber is expensive and hard, and there are cases where problems arise in workability such as drilling.
JP-A-9-74255 JP 11-292567 A JP-A-2-61131 Japanese Patent Laid-Open No. 10-310967 JP 2000-234239 A JP 2004-99377 A

  The present invention is applicable to high-frequency circuits and flip-chips used for high-frequency circuits exceeding 1 GHz, in particular, super-high-frequency circuits exceeding 10 GHz, by improving the electrical and thermal characteristics of glass cloth used for printed wiring boards. It aims at providing the glass yarn and glass cloth for low expansion printed wiring boards.

  As a result of diligent investigations to investigate the factors affecting the dielectric constant and dielectric loss tangent of the printed wiring board and the coefficient of thermal expansion, the inventors have improved by mixing different types of glass fibers into the glass cloth. I found out that I can do it.

  That is, a quartz glass filament and a glass filament other than quartz glass are mixed to form a yarn, and a glass cloth obtained by weaving the yarn is impregnated with a thermosetting resin or the like to produce a heat-pressed laminated sheet. Thus, it has been found that a printed wiring board having a low dielectric constant and a low dielectric loss tangent and a low thermal expansion coefficient can be obtained.

  In order to solve the above problems, a first aspect of the mixed fiber glass yarn of the present invention is a mixed fiber glass comprising a quartz glass filament and a non-quartz glass filament that is a glass filament different from one or more types of quartz glass filaments. The yarn is characterized in that the ratio (B / A) of the weight A of the quartz glass filament to the weight B of the non-quartz glass filament is 0.1-10. In the present invention, the glass yarn is a general term for glass fiber single yarn, twisted yarn, alignment yarn and the like. In the present invention, a state in which two or more filaments forming a yarn are mixed is referred to as mixed fiber.

  A second aspect of the mixed fiber glass yarn of the present invention includes one or more quartz glass strands including a plurality of quartz glass filaments and a plurality of non-quartz glass filaments which are glass filaments different from the quartz glass. A mixed fiber glass yarn composed of at least non-quartz glass strands, wherein the ratio (B / A) of the weight A of the quartz glass strands to the weight B of the non-quartz glass strands is 0.1 to 10. It is characterized by. In the present invention, a bundle in which filaments are converged is called a strand. In the present invention, glass other than quartz glass may be referred to as non-quartz glass.

  It is preferable that the diameter of the quartz glass filament and the diameter of the non-quartz glass filament constituting the glass yarn of the present invention are φ3 μm or more and φ15 μm or less, respectively.

  The glass cloth of the present invention is characterized by using the mixed fiber glass yarn of the present invention. The weaving method of the glass cloth is not particularly limited, but plain weaving is preferable.

  According to the present invention, it is possible to obtain a glass yarn and a glass cloth that are inexpensive, excellent in electrical characteristics and thermal characteristics, and suitable for printed wiring boards.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. However, the illustrated examples are illustrative only, and various modifications can be made without departing from the technical idea of the present invention. .

  FIG. 1 is a schematic explanatory view showing an example of an apparatus for producing a mixed fiber glass yarn of the present invention. Reference numeral 10 denotes a mixed fiber glass yarn manufacturing apparatus (ring twisting machine in the illustrated example) of the present invention, a cake 12 obtained by winding a quartz glass strand made of a quartz glass filament, and a non-quartz glass strand made of a glass filament other than quartz glass. It has the cake 14 which wound up.

  Quartz glass fiber has a high viscosity at the spinning temperature, and filaments cannot be obtained by the melt spinning method. Therefore, the end of the quartz glass rod is melted, and the quartz glass is filamentized by continuously pulling it out at high speed. The cake 12 can be produced by a machine.

  As glass fibers other than quartz glass, it is preferable to use continuous glass fibers such as E glass, D glass, NE glass, C glass, S glass, T glass, and H glass. With these glass fibers other than quartz glass, the cake 14 can be produced by a known melt spinning method.

  As shown in FIG. 1, a ring twisting machine 10 is used to draw strands 16a and 16b from a quartz glass fiber cake 12 and a glass fiber cake 14 other than quartz glass, respectively, to form a mixed fiber strand 18 and a ring 20 A twisted fiberglass yarn can be produced by twisting by rotating a traveler running around the belt and winding the yarn around a bobbin 24 rotated by a spindle 22. In addition, although the example using the ring twisting machine 10 was shown in FIG. 1, when manufacturing the twisted mixed fiber glass yarn, the twisting method is not specifically limited, What is necessary is just to select a well-known method suitably. .

  FIG. 1 shows an example of producing a mixed fiber glass yarn using one quartz glass strand and one non-quartz glass strand, but the number of each glass strand is not particularly limited, and a plurality of glass strands are used. Strands may be used. Further, quartz glass fibers and two or more kinds of non-quartz glass fibers may be used.

  FIG. 1 shows an example of producing a mixed fiber glass yarn by twisting a strand, but it is also possible to produce a mixed fiber glass yarn without applying a twist such as using a sizing agent. include.

  A glass cloth can be produced from the produced mixed fiber glass yarn by a known weaving method. The thickness of the yarn used for the glass cloth, the number of yarns, the number of twists of the yarn, etc. are not particularly limited, and can be appropriately selected as necessary. The weaving density, dimensions, and weaving method of the glass cloth are not particularly limited. Examples of the weaving method include plain weaving, twill weaving, satin weaving, leash weaving, and the like.

  It is effective to remove organic substances such as sizing agent in the deoiling process, apply a surface treatment according to the purpose of use, and impregnate the matrix cloth according to the purpose such as a thermosetting resin. It is.

  The present invention will be described more specifically with reference to the following examples. However, it is needless to say that these examples are shown by way of illustration and should not be construed in a limited manner.

(Example 1)
Using the apparatus shown in FIG. 1, a cake formed by winding a strand formed from 40 quartz glass filaments having a fiber diameter of 7 μm and a cake formed by winding a strand formed from 200 E glass filaments having a fiber diameter of 7 μm Were twisted to prepare a glass yarn C (ratio of weight A of quartz glass filaments to weight B of E glass filaments (B / A): 5.82).

The glass yarn C was woven to obtain a glass cloth. The obtained glass cloth was impregnated with an epoxy resin to obtain a B-stage prepreg. The prepreg was heat-cured to produce a printed wiring board for evaluation, and dielectric constant and dielectric loss tangent measurement were performed according to JIS R1641. The coefficient of thermal expansion is measured using a measuring instrument under the conditions of a measurement temperature of room temperature to 300 ° C., a temperature increase rate of 10 ° C./min, a nitrogen atmosphere, a standard sample SiO ₂ , and a thermocouple type R thermocouple for temperature measurement. Went. The measurement results are shown in Table 1.

(Example 2)
Using the apparatus shown in FIG. 1, a cake in which a strand formed from 80 quartz glass filaments having a fiber diameter of 7 μm is wound and a cake in which a strand formed from 200 E glass filaments having a fiber diameter of 7 μm are wound. Were twisted to prepare a glass yarn D (ratio of weight A of quartz glass filaments to weight B of E glass filaments (B / A): 2.91). The glass yarn D was used for woven to obtain a glass cloth. Each measurement was performed using the obtained glass cloth as a printed wiring board in the same manner as in Example 1. The measurement results are shown in Table 1.

(Example 3)
Using the apparatus shown in FIG. 1, a cake in which a strand formed from 200 quartz glass filaments having a fiber diameter of 7 μm is wound, and a cake in which a strand formed from 200 E glass filaments having a fiber diameter of 7 μm are wound. Were twisted to prepare a glass yarn E (ratio of weight A of quartz glass filament to weight B of E glass filament (B / A): 1.16). The glass yarn E was used for woven to obtain a glass cloth. Each measurement was performed using the obtained glass cloth as a printed wiring board in the same manner as in Example 1. The measurement results are shown in Table 1.

(Comparative Example 1)
200 E glass filaments having a fiber diameter of 7 μm were melt-spun to prepare a cake. Strands were wound from the cake with a twisting machine to produce glass yarn F. The glass yarn F was woven, and the obtained glass cloth was measured as a printed wiring board in the same manner as in Example 1. The measurement results are shown in Table 1.

(Comparative Example 2)
400 E glass filaments having a fiber diameter of 7 μm were melt-spun to prepare a cake. Strands were wound from this cake with a twisting machine to produce glass yarn G. The glass yarn G was used for woven fabric, and the obtained glass cloth was used as a printed wiring board in the same manner as in Example 1 to perform each measurement. The measurement results are shown in Table 1.

  As is apparent from the measurement results shown in Table 1, the measured values of the dielectric constant, dielectric loss tangent and thermal expansion coefficient of the glass cloth in Examples 1 to 3 are compared with the measured values of the glass cloth of Comparative Examples 1 and 2. It showed a low value, and it was confirmed that it was suitably used as a printed wiring board.

It is a schematic explanatory drawing which shows an example of the manufacturing apparatus of the mixed fiber glass yarn of this invention.

Explanation of symbols

10: ring twisting machine, 12: cake of quartz glass fiber, 14: cake of glass fiber other than quartz glass, 16a: quartz glass strand, 16b: non-quartz glass strand, 18: mixed fiber glass strand, 20: ring, 22 : Spindle, 24: Bobbin.

Claims (5)

  A mixed fiber yarn comprising a quartz glass filament and a non-quartz glass filament that is a glass filament different from one or more types of quartz glass filaments, wherein the weight A of the quartz glass filament and the weight B of the non-quartz glass filament A mixed fiber glass yarn having a ratio (B / A) of 0.1 to 10.   Mixed fiber glass yarn comprising one or more quartz glass strands including a plurality of quartz glass filaments and one or more non-quartz glass strands including a plurality of non-quartz glass filaments which are glass filaments different from quartz glass. The ratio of the weight A of the quartz glass strand to the weight B of the non-quartz glass strand (B / A) is 0.1 to 10, and the mixed fiber glass yarn.   3. The glass yarn according to claim 1, wherein the diameter of the quartz glass filament and the diameter of the non-quartz glass filament are from 3 μm to 15 μm, respectively.   The glass cloth using the mixed fiber glass yarn of any one of Claims 1-3. 5. The glass cloth according to claim 4, wherein the glass cloth is a plain weave.

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