JP3081848B2 - Glass fiber body for printed circuit boards - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a glass fiber body for reinforcing a fluorine resin.

[Prior art and problems] As is well known, fluororesins are excellent in heat resistance, chemical resistance, electrical properties, slipperiness, etc., but have the drawback that they are soft materials and have low mechanical strength. . For this reason, the fluorine resin is used in a reinforced state using glass fiber, graphite, bronze, carbon fiber, and other inorganic fillers. Among them, glass fiber is inexpensive, has excellent electrical properties, mechanical strength, etc., and fluororesin products reinforced with glass fiber products are used in the field of construction, such as roof materials for membrane structures, and in the field of electrical materials, such as insulating materials. Its applications are expanding to various fields. For example, a laminate obtained by laminating a fired prepreg impregnated with a fluorine resin on a glass fiber cloth is used as a dielectric material of a printed circuit board as a material having good electrical insulation, heat insulation and heat resistance. However, if the electrical insulation resistance is 10
When the measurement is performed after the boiling treatment at 0 ° C. for 2 hours, minute adhesion failure at the interface between the fluororesin and the glass fiber causes a decrease in insulation resistance, that is, a decrease in water resistance.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a glass fiber body for reinforcing a fluorine resin which has excellent adhesion to a fluorine resin.

[Means for Solving the Problems] The present invention is characterized in that it is obtained by bundling a large number of filaments which have been treated with a surfactant-containing aqueous medium containing fluoropolymer fine particles as an essential component. Glass fiber body for a printed circuit board.

Examples of the fluoropolymer fine particles according to the present invention include polytetrafluoroethylene (PTFE), a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (PFA), and a copolymer of tetrafluoroethylene and hexfluoropropylene (FEP). ), A copolymer of tetrafluoroethylene and ethylene (ETFE), or polyvinylidene fluoride (PVDF). In addition, the above PTFE
Examples thereof include not only homopolymers of tetrafluoroethylene, but also those modified by copolymerizing a small amount (for example, about 0.5 mol% or less) of another comonomer. Such comonomers include haxafluoropropylene, chlorofluoroethylene, perfluoroalkyl vinyl ether, trifluoroethylene, and the like. As the aqueous medium containing such fluoropolymer fine particles, a suspension or emulsion obtained by suspension polymerization or emulsion polymerization of a fluoromonomer in an aqueous medium containing a surfactant is preferable, and among them, an aqueous dispersion of PTFE is preferable. preferable.

The aqueous medium containing the fluoropolymer fine particles has a polymer content of 90% or less, preferably 60% or less, more preferably 20% or less.
% Or less, which is preferable from the viewpoint of stability of the aqueous medium and treatment of the glass fiber.

In the present invention, the surfactant is present as an emulsifier for the fluorine-containing polymer fine particles, and the presence of the surfactant makes the fluorine-containing fine particles in a dispersion form. The surfactant may be any of an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant, and among them, an aqueous surfactant is preferably used. Here, the amount of the surfactant can be appropriately selected within a range of 0.01% or more, but is preferably 0.01 to 1.0%.

In the glass fiber according to the present invention, the amount of the surfactant-containing aqueous medium containing the fluoropolymer fine particles as an essential component is in the range of 0.3 to 3% by weight, preferably 0.5 to 1.5% by weight as a solid. Quantity.

[Function] According to the present invention, a glass fiber body for reinforcing a fluorine resin having excellent adhesion to a fluorine resin can be obtained.

Example 1 Hereinafter, an example of the present invention will be described with reference to a first method while describing a manufacturing method.
This will be described with reference to the drawings.

First, a PTFE dispersion 20 having a solid content of 60% by weight was prepared by emulsion polymerization in an aqueous medium containing ammonium perfluoroethylene oxide as a surfactant.
A treatment liquid was prepared by mixing parts by weight with 80 parts by weight of distilled water.
Next, this treatment liquid was coated on a melt-spun glass filament (5 μm in diameter) by an applicator, and the glass filament was bundled into a strand and wound around a rotating drum. As a result, a predetermined number of strands are passed through the plying yarn process and the weaving process to JIS-R-341.
5 EGC10B glass cloth (thickness 0.1 mm) was produced.

Next, this glass cloth is immersed in a PTFE dispersion (trade name: T-30J, manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.), and the process of heating at 370 ° C. is repeated several times to form a PTFE-coated glass cloth (0.125 mm thick). , PTFE content 65%)
I got 1a. Thereafter, 12 pieces of the glass cloth 1a are stacked to form a substrate 1, and a PFA having a thickness of 0.025 mm is formed on the upper and lower surfaces of the substrate 1.
The films 2a and 2b were placed. Then, on the upper and lower surfaces
Place 0.035mm copper foil 3a, 3b, molding pressure 30Kg / cm ² , 370 ℃
For 60 minutes to obtain a laminate having a thickness of 1.6 mm. When the electrical insulation resistance of this laminate was measured after boiling at 100 ° C. for 2 hours in accordance with the test method of JIS-C-6481, 3.4 × 10 ¹³
Ω.

The fluororesin composite sheet thus obtained is the first sheet.
As shown in the figure, a substrate 1 obtained by laminating 12 glass cloths 1a, PFA films 2a and 2b formed on the upper and lower surfaces of the substrate 1, and copper formed on the upper and lower surfaces, respectively. Foil 3a,
3b, a glass fiber body for reinforcing a fluorine resin having excellent adhesion to the fluorine resin can be obtained.

[Comparative Example] A glass cloth (trade name: WE116, equivalent to EGC10B) of JIS-R-3415 comprising a glass filament treated with a sizing agent having a starch oil agent as a main component, which is currently generally used. A laminate having a thickness of 1.6 mm was obtained by processing under the same conditions as in the example except that Nitto Boseki (product) was used. When the electrical insulation resistance was measured under the same conditions as in the example, 1.3
× 10 ⁹ Ω.

[Effects of the Invention] As described above in detail, according to the present invention, it is possible to provide a glass fiber body for reinforcing a fluorine resin, which has excellent adhesion to the fluorine resin.

[Brief description of the drawings]

FIG. 1 is an illustration of a fluororesin composite sheet according to one embodiment of the present invention. 1 ... substrate, 1a ... glass cloth, 2a, 2b ... PFA film, 3a, 3b ... copper foil.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29B 15/10 B29B 11/16 H05K 1/03 610 B29K 27:12 B29K 105: 06

Claims (1)

(57) [Claims] 1. A glass fiber body for a printed circuit board, which is obtained by bundling a large number of filaments which have been treated with an aqueous medium containing a surfactant containing fine particles of a fluoropolymer as an essential component. .