JPS6286029A - Prepreg - Google Patents

Abstract

PURPOSE:To increase the dimensional stability of a laminated sheet formed of prepregs and to decrease its anisotropy, by using an alkali-free glass cloth base which is made of alkali-free filaments and satisfies a specified relationship between the count of warps and that of wefts. CONSTITUTION:A prepreg formed by impregnating an alkali-free glass cloth base which is made of alkali-free filaments and satisfies the relationships of 42<=X<=58, 42<=Y<=58 and ¦X-Y¦<=3, wherein X is the count of warps per 25cm and Y is that of wefts per 25cm, with a resin and drying it. Said warps and wefts are monofilaments such as ECD, ECDE, ECE or ECG as stipulated by JIS R3413 or equivalents. By using a laminated sheet obtained by laminate- molding the above prepregs as a printed wiring board, exact component mount ing can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a prepreg for a laminate that can be suitably employed as a printed wiring board.

[Background Art] Using a conventional single yarn of, for example, ECDE 150110,
25cvn warp and weft thread book WLx and Y
The laminates formed by laminating and molding prepreg obtained by impregnating resin and drying the plain weave VL plus cloth with 64 and 46 fibers as a base material have large dimensional changes due to shrinkage. Due to the anisotropy caused by shrinkage, when used as a printed wiring board, for example, automatic mounting machines often make mistakes when mounting components, resulting in a lack of reliability.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its purpose is to improve the dimensional stability of prepreg (
The object of this invention is to reduce anisotropy and, therefore, to enable reliable component mounting even when a laminate obtained by laminating and molding these ripple legs is used as a printed wiring board.

[Disclosure of the Invention 1] The prepreg of the present invention uses non-alkali filaments, and has a warp and a weft of approximately 25c+a with the number of implanted yarns X and Y.
It is made by impregnating a non-alkali glass cloth base material with a resin and drying it.

The warp and weft used in the present invention are single yarns such as ECDSECDE, ECE, and ECG specified in JIS R3413, or single yarns equivalent thereto. Here, E means alkali-free glass, C means 4a, fiber, glue at the end, DE,
E and G refer to the thread diameters of 5.6 and 7.9 microns, respectively. The count is 75.100.110.12
5.150.175.200.225 etc. can be used. Here, count 100 means 100X100Yd
/ lb is shown. In the present invention, the numbers X and Y of the warp and weft threads per 25 cm are 42≦X≦5.
It is essential that 8.42≦Y≦58 and IX−Yl≦3 be satisfied. These warp and weft yarns have a bundle number of 200 or more, for example, a plain weave, and a weight of 100 to 250 g/m
It is 2. Satisfying this specific relationship affects the absolute value and balance of dimensional changes in the longitudinal and lateral directions, improving the dimensional stability of laminates formed from prepregs obtained using this alkali-free glass fabric base material. This can be suitably employed as a printed wiring board. prepreg l
This alkali-free material is applied to the lath cloth base material by adding 7 ethanol (I) to the base material.
It is formed by impregnating and drying a thermosetting resin such as IW, epoxy resin, area resin, unsaturated polyester U (fat, etc.).The amount of resin impregnated is in the range of 45 to 54% by weight in terms of solid content, and the curing time is The drying time is 80 to 180 seconds, the drying temperature is 140 to 180 DEG C., preferably the 170"C1 volatile content is 0.1 to 0.6% by weight, and the flowability is 27 to 37% by weight.

A required number of sheets of this prepreg are laminated and molded, and metal foil such as copper foil, aluminum foil, stainless steel foil, etc. is adhered to both or one side of the prepreg to form a laminate. For lamination molding, the pressure is 20
-150kg/c+n2, temperature 140-180°C, 1 hour 20-150 minutes.

Next, a detailed explanation of the present invention will be provided to demonstrate the above-mentioned advantages. Note that the present invention is not limited only to the following examples.

(Example 1) ECE 100110 (count 100) was used as the warp and weft.
A plain weave was made using single yarns (200 bundled yarns) with the number of yarns X and Y per 25 cm being 45 and 44, respectively, to form an alkali-free glass cloth base material weighing 165 to 170 g/lo2. .

Next, epoxy resin (
Bis7er/el type, epoxy equivalent 450-550
), 3 parts by weight of dicyandiamide, and 0.1 part by weight of 2-methyl imiguzole was impregnated with a thermosetting resin composition and dried and cured at 17Q'C for 130±30 seconds. A prepreg with the characteristics shown was obtained.

After that, a plurality of sheets of this prepreg were stacked to form a laminated base material, and the pressure was 40 kg/cm2, the temperature was 170°C, and the opening time was 1.
After lamination molding for 20 minutes, heat treatment at a temperature of 80°C for 30 minutes, and then at a temperature of 170°C for 30 minutes, the amount of dimensional change, vertical and horizontal dimensional changes and variations (σ), etc. were measured and the prepreg was secondary formed. We examined the performance. The results are shown in the ttS2 table.

(Example 2) EGG 150110 (count 150) was used as the warp and weft.
A single yarn of 200 bundled yarns) was used to form a plain weave with the number XSY of yarns per 25 cm of 57 and 56, respectively, to form an alkali-free glass cloth base material weighing 145 to 160 g/[C2].

Next, a prepreg was obtained in the same manner as in Example 1, and the secondary molding performance of this prepreg was examined.

The results are shown in Table 2.

(Comparative Example 1) ECDE 150110<count 15 as warp and weft
A flat ar+ configuration was made using 0 single yarn, the number of bundled yarns was 450, and the number of implants X and Y were 64 and 46, respectively, to form a base material of alkali-free glass cloth with a weight of 150) H/m2. A prepreg was obtained in the same manner as in Example 1 except for the above, and the secondary molding performance of this prepreg was examined. The results are shown in Table 2.

(Comparative Example 2) ECDE 150110 (count 15) was used as the warp and weft.
0 single yarn, number of bundles: 450), the number of implants per 25 cm (X% Y) was 60 and 50, respectively, and 9 pieces were constructed to form an alkali-free glass cloth base material weighing 149 g/+2. A prepreg was prepared in the same manner as in Example 1 except for the following steps, and the secondary molding performance of this prepreg was examined. The results are shown in table p4'fJ2.

(Comparative Example 3) ECE 225110 (count 150) was used as the warp and weft.
A single yarn, bundled f11.225 pieces) was used, and the number of implants X and Y per 25 cm were 60 and 58 pieces, respectively, to form a plain weave structure, and a non-alkali glass cloth base material weighing 3105 g/m2 was formed. prepared a prepreg in the same manner as in Example 1, and examined the secondary molding performance of this prepreg.The results are shown in Table 2.

Below is white m --- Engineering No. 1 & Prepreg characteristics Example Comparative example Resin amount Q50 ± 453 ± 4535 351 ~ 54 Palpability Q 30 ± 5 Same 31342'' Curing time: 130 ± 30 Tsukasa - 165177100 ~ 1801
Volatility'0.51; , 0.3 0
．． 4 00 inches - Table 2 Secondary molding performance example Comparative example Thickness after molding 11 cm - 1 mm 30.141 0.137 0,107
0.094 Dimensional change μ m Amount of change 35 37 129 56 81
Vertical 24 23 161 55 55σ
13 10 23 13 20 horizontal 3
7 40 22 33 57 From the results in Table 2, the dimensional change of the laminate formed according to the example of the present invention is small, and when this board is used as a printed wiring board, there is no possibility of component mounting errors in the automatic actual VC machine. is less than 1/10 of that of the comparative example [Effect of the invention] The prepreg of the present invention uses non-alkali filament, and the number of warp and weft threads per 25 cm is X and Y7.
5t42≦X≦58.42≦Y≦58, IX-Y｜≦3
The alkali-free fuss cloth base material is impregnated with a resin and dried,
By using an alkali-free glass cloth base material that satisfies this specific relationship, it is possible to reduce the absolute value of the dimensional change in the vertical and horizontal directions, and to achieve a balance between them. The laminate formed by this method has high dimensional stability and low anisotropy, and can be used as a printed wiring board to enable reliable component mounting and improve reliability.

Claims (1)

[Claims] (1) An alkali-free glass cloth base material using an alkali-free filament and having the relationship X and Y of the warp and weft threads per 25 cm as follows: 42≦X≦58 42≦Y≦58 |X-Y|≦3 A prepreg characterized by being made by impregnating a resin with a resin and drying it.