JPS5848990A - Integrated circuit part coating resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin for covering integrated circuit components that is most suitable for use in equipment that handles water such as washing machines, and is intended to prevent the adverse effects of humidity on integrated circuit components. It is.

With the advancement of integrated circuit (IO) components, the number of home appliances that utilize microcomputers has increased. Washing machines are one such example, but the characteristics of IC components used in microcomputer circuits tend to change depending on humidity, and in order to maintain their original characteristics, they must be coated with an insulating resin that has excellent moisture resistance. There is. However, the characteristics of IC parts tend to change depending on the electrical properties of the resin they are coated with, curing shrinkage, etc., and when used in a washing machine, the operating temperature varies greatly depending on the season and the installation location. It is necessary that the properties and hardness (curing shrinkage) do not change due to temperature, and since a detergent is used, it is required that the resin surface does not generate dust.

The present invention has been made in view of the above points, and by using a rubber-like substance obtained by crosslinking a liquid polybutadiene oligomer having hydroxyl groups at both ends of the molecule with incyanate, it has improved moisture resistance and electrical properties. The present invention provides a resin for covering IC parts that has excellent detergent resistance and little change in hardness due to temperature.

Liquid polybutadiene with hydroxyl groups at both ends of the molecule (e.g. 1,4 polybutadiene, Idemitsu Petrochemical Exhibition, R-4sH
T) has good compatibility with paraffinic and naphthenic oils, so any viscosity that suits the application method such as dipping, coating, etc. can be freely selected, and it is a cured product that is crosslinked with incyanate. There is a large change in hardness at -20 to 30°C, and 3- electrical properties (ε, j2Lnδ, etc.) and volume resistance hardly change. There is still no deterioration in volume resistivity or surface condition in terms of moisture resistance and detergent resistance. Therefore, by coating IC components with liquid polybutadiene that has been adjusted to a desired viscosity with oil and crosslinked with incyanate, it is possible to prevent the characteristics from deteriorating under high humidity conditions.

Examples of the present invention are shown below.

NTR wires were soldered to the printed circuit board at 5-wire intervals, coated with polybutadiene to a thickness of 31 nm, and heated at 85°C.
96%R)! The volume resistance between the wires inside was measured. The composition is shown in Table 1, and the change in volume resistance is shown in Table 2. Table 2 also shows, as a reference, the values when coated with commercially available polyurethane.

Table 1 Table 2 (85°C, 95°RH) As is clear from Table 2, the coating resin of the present invention
There was no change in volume resistivity even after the passage of time, indicating excellent characteristics.

Next, using a resin having the composition of N11 in Table 1, -20℃~
Changes in hardness in a temperature range of 30'C were measured using a JIS rubber hardness meter. The results are shown in Table 3.

The resin of the present invention has sufficient hardness within this range.

6-1 Table 3 Next, in the same way as in the above case, using the resin having the composition of No. 1 in Table 1, cast a disc with a diameter of 2.0 to 2.5 mm and 65φ at -20°C. Dielectric constant up to 1000 hours.

Dielectric loss tangent 9 volume resistance was measured. The results are shown in FIGS. 1, 2, and 3.Furthermore, using the resin having the composition in Table 1, 2.0 to 2.0 to 2.0.
A cast disc having a diameter of 5 mm and a diameter of 65 φ was immersed in a 1% Zabu (trade name) aqueous solution at 60° C., and the dielectric constant, dielectric loss tangent, and volume resistance were measured and the surface condition was observed for up to 100 hours. As a result, there was no equivalent change in the surface condition. Also,
Figure 4 shows the measured values at this time.

It is shown in FIG.

As is clear from the above explanation and the results shown in each figure, by using the coating resin of the present invention, it is possible to prevent the characteristics of XC parts from deteriorating due to humidity, detergent, etc. When used in equipment that handles water, it can greatly improve its reliability and is of great industrial value.

[Brief explanation of drawings]

FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6 are diagrams showing changes in various characteristics over time of the resin for covering integrated circuit components according to the present invention. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4 Figure 1 Sei Ginma, i Figure 5 □□□1 Lower Figure 6 Time (Ar)

Claims (1)

[Claims] 1. A resin for covering integrated circuit parts, characterized in that the main component is a liquid polybutadiene oligomer having hydroxyl groups at both ends of the molecule, and a rubber-like substance obtained by crosslinking this with incyanate.