JPH05198906A - Glass cloth for laminated board and metal foil laminated board using the same cloth - Google Patents

Abstract

PURPOSE:To prevent wrinkles of a surface metal foil and cut of glass cloth occurring after a laminated layer is formed by preventing fraying of the cloth with resin having a melting point of the layer forming temperature or lower. CONSTITUTION:A 190mum type glass cloth (WEA681) is coated in the vicinity of both side ends with polyester resin having a melting point of 145 deg.C as fraying preventing resin in a width of 10mm, solidified, and then cut substantially at a center thereby to obtain a fraying prevented long glass cloth. The cloth is impregnated with FR-4 epoxy resin containing 80 pts.wt. of low bromo-type epoxy resin, 20 pts.wt. of novolac type epoxy resin, 3 pts.wt. of dicyanamide, 2E4MX0, 80PHR, and dried to obtain prepreg having 4+ or -1% of resin amount, gel time 130sec of l70 deg.C. The eight prepregs are superposed, copper foils of 18mum are laminated on front and rear surfaces, engaged in mold plates, and a metal foil-laminated board having a thickness of 1.6mm is obtained under the conditions of a molding pressure of 50kg/cm<2>, a molding temperature of 170 deg.C and a molding time of 120min.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass cloth for laminated boards used for printed wiring boards and the like, and a metal foil-clad laminated board using the glass cloth.

[0002]

2. Description of the Related Art Recently, glass cloth-based laminates have been widely used in various fields of the electronic industry and communication industry. Currently, the air jet method is the mainstream as the weaving method for the glass cloth of the base material, and as a method for treating the edge of the cloth to prevent fraying, resin is applied or impregnated near the edge of the glass cloth to solidify or cure and cut this part. Then, it is processed to a predetermined size.

A thermoplastic resin such as polyester is usually used as a resin to be applied or impregnated in the vicinity of the edge of a glass cloth. The above glass cloth is impregnated with a resin to form a prepreg, a predetermined number of these prepregs are stacked, a metal foil is used as the outermost layer, and a mold plate is sandwiched to form a laminated plate at a predetermined temperature and pressure. The thickness of the resin portion applied for prevention is thicker than that of the glass cloth portion after the prepreg is formed, which causes problems such as wrinkles of the metal foil on the surface of the laminate and breakage of the glass cloth.

As a measure to prevent the above problem, the thickness of the warp threads at both ends of the glass cloth is made smaller than that of the weft thread to take measures against the thickness of the resin coating portion for preventing fraying. However, there is a problem that the thickness may be increased when the coating position is displaced from the thin thread portion.

As a technique for applying a thermoplastic polyester resin such as polyester to the vicinity of the edge of the glass cloth, Japanese Patent Laid-Open No. 61-160209 discloses a softening point of 150 to 180 ° C.
Of saturated polyesters are described. The aim is to prevent the anti-fray resin from softening at the drying temperature after impregnation of the main resin and reducing the fixing force of the frayed portion. If the temperature is 150 ° C or lower, the resin is cut during the drying process. The force to fix the part is too low to be adopted. The upper limit of 180 ° C. is a temperature at which the solubility in the solvent that dissolves the anti-fray resin can be secured. There is no description of specifying the melting point of the fray prevention resin for the purpose of making the thickness of the prepreg uniform by remelting the fray prevention resin at the time of laminate molding.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a glass cloth which can prevent wrinkles of the surface metal foil and breakage of the glass cloth which occur after lamination molding, and a metal foil-clad laminate having an excellent surface appearance.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is characterized in that the edges of a glass cloth are prevented from fraying with a resin having a melting point lower than the lamination molding temperature of a laminated plate. There are a glass cloth for laminated plates and a metal foil-clad laminated board using this glass cloth as a base material.

As the glass cloth of the present invention, it is possible to use a cloth which is formed by weaving a plain weave, a twill weave, a satin weave, etc., using glass yarns made of glass fibers. Dimensional stability,
A plain-woven glass cloth is preferable from the viewpoint of reducing twist. Also, as for its components, SiO ₂ is the main component, and PbO, B
It is also possible to use a material that contains aTiO ₃ , lanthanum oxide or the like and is suitable for high frequencies.

The resin having a melting point not higher than the lamination molding temperature of the laminate of the present invention is a saturated polyester resin, preferably a polyester resin having a melting point of 80 to 145 ° C., more preferably 100 to 140 ° C. or a thermosetting resin B. The melting point of the resin in a stage state including a resin having a melting point is preferably 90 to
An epoxy resin having a temperature of 120 ° C. may be used. The melting point of the fray prevention resin is limited when the melting point is lower than 80 ° C., because the fray prevention resin is easily dissolved in the solvent that dissolves the main resin with which the glass cloth base material is impregnated. When the melting point exceeds 145 ° C, it will fall into the range of the molding temperature for the metal foil-clad laminate, and the fray prevention resin will not easily remelt during the laminate molding. , The thickness uniformity of the prepreg cannot be obtained.

In order to prevent the base material from being frayed, the above resin can be processed by coating the base material with a method such as coating, coating and impregnation.

A main resin is impregnated and dried using the glass cloth obtained above as a base material to obtain a prepreg, and a required number of these prepregs and a metal foil are laminated and molded to obtain a copper foil-clad laminate. The conditions for lamination molding are temperature 145 to 200
Conditions suitable for the main resin can be selected and used within a range of, for example, a temperature of 15 ° C., a pressure of 15 to 100 kg / cm ² , and a molding time of 20 to 200 minutes.

As the main resin, epoxy resin, polyimide resin, fluororesin, PPO resin, unsaturated polyester resin, phenol resin alone, a modified resin using these as base resins, and a combination resin of these resins, etc. Can be used. Further, these resins can be used by filling them with an inorganic filler such as alumina, silica, calcium carbonate, talc, clay, barium sulfate or aluminum hydroxide.

As the metal foil, a metal foil of copper, nickel, aluminum, stainless steel or the like, particularly a copper foil is preferable in terms of good electric conductivity. In this case, electrolytic copper foil,
Any rolled copper foil may be used without any particular limitation.

[0014]

[Function] The melting point of the fray prevention resin and the melting point of the resin in the B-stage state are not higher than the lamination molding temperature of the metal foil-clad laminate, and more preferably, the fray prevention resin having a melting point within the melting time of the lamination molding. By using the resin, the fray prevention resin is remelted during the lamination molding, so that the thickness of the prepreg during the lamination molding becomes uniform. In the lamination molding with the metal foil using this prepreg, the pressure is applied uniformly, the volatile component is smoothly removed, the metal foil-clad laminate obtained is wrinkle-free on the surface metal foil, It can prevent a piece of cloth from breaking.

[0015]

EXAMPLES The present invention will be specifically described below with reference to examples. (Example 1) 190 μm type glass cloth (WE
A681) A polyester resin having a melting point of 145 ° C. is applied in the width of 10 mm as a fray prevention resin in the vicinity of both side ends,
After solidification, the center of the glass was cut to obtain a long band-shaped glass cloth which was not frayed. Using this glass cloth, 80 parts by weight of low brom type epoxy resin, 20 parts by weight of novolak type epoxy resin, 3 parts by weight of dicyandiamide, 2E4MZ 0.08PH
An FR-4 epoxy resin containing R was impregnated and dried to obtain a prepreg having a resin amount of 40 ± 1% and a gel time of 130 seconds at 170 ° C. 8 layers of this prepreg, 18
Laminate μm copper foil, sandwich between mold plates, molding pressure 50
A metal foil-clad laminate having a thickness of 1.6 mm was obtained under the conditions of kg / cm ² , molding temperature of 170 ° C. and molding time of 120 minutes. (Example 2) The melting point of the polyester resin of Example 1 was set to 10
The same procedure as in Example 1 was repeated except that the polyester resin was changed to 0 ° C. (Example 3) 190 μm type glass cloth (WE
A681) Epoxy resin is applied as a fray prevention resin with a width of 10 mm in the vicinity of both side edges, and it is semi-cured in the B stage state to have a melting point of 100 ° C. A long strip of glass cloth was obtained. Then, the same procedure as in Example 1 was performed. (Comparative Example 1) The melting point of the polyester resin of Example 1 was set to 18
The same procedure as in Example 1 was repeated except that the polyester resin was changed to 0 ° C. (Comparative Example 2) 190 μm type glass cloth (WE
(A681) ECG75,1 / 0 is used for the warp threads on both side ends, and the thickness is reduced to a melting point of 180 as a fray prevention resin.
A polyester resin at a temperature of 10 ° C. was applied in a width of 10 mm, solidified, and then cut in substantially the center thereof to obtain a long band-shaped glass cloth with fray-preventing properties. The following is the same as in Example 1 and the thickness is 1.6 mm.
A metal foil-clad laminate of was obtained.

From Table 1, the examples in which the melting point of the anti-fray resin of the glass cloth is lower than the laminating temperature is higher than that of the comparative example in which the resin having a melting point higher than the laminating temperature is used. It was confirmed that the metal foil was excellent in wrinkle occurrence rate and glass cloth breakage rate. Even if the melting point in Comparative Example 2 is higher than the lamination molding temperature, it is improved to some extent by considering the thickness of the thread, twisting, etc. when knitting into a cloth.
Workability becomes complicated and not suitable for practical use.

[0017]

[Table 1]

[0018]

According to the present invention, due to the resin used for preventing fraying of glass cloth, wrinkles and glass cloth breakage do not occur on the surface metal foil when laminated and formed on a metal foil-clad laminate. Therefore, a metal foil-clad laminate having an excellent surface appearance can be obtained.

Claims (3)

[Claims] 1. A glass cloth for a laminated plate, characterized in that an edge portion of the glass cloth is prevented from fraying with a resin having a melting point equal to or lower than a laminating molding temperature of the laminated plate. 2. The melting point of the resin according to claim 1 is 80 to 145 ° C.
The glass cloth for laminated plate according to claim 1, wherein 3. A metal foil-clad laminate using the glass cloth of claim 1 as a substrate.