JPH0736451B2 - Light emitting element or light receiving element sealed body - Google Patents

Description

The present invention relates to a light emitting element or light receiving element sealing body using a polycarbonate case.

The outer case used for displaying LED characters is made of polyester or polycarbonate, and the frame with the element is installed in the case and molded with casting resin. The mold casting resin used at this time is required to have transparency, heat resistance, and electrical characteristics, and generally a composition comprising an epoxy resin, an acid anhydride-based curing agent, and a curing accelerator such as a tertiary amine is used. To do. However, when a case made of polycarbonate is used, the case is corroded and melts white and is deformed in a severe case before the resin composition is cast into the case and heated and hardened.

The present invention is made by improving such drawbacks. (A) Epoxy resin (B) (i) 1 mol of acid anhydride curing agent and (ii) 1 equivalent of acid anhydride group of acid anhydride and polyvalent Ester bond-containing carboxylic acid-based curing agent obtained by reacting 1 equivalent of hydroxyl group of alcohol Mixed curing agent consisting of 0.01 to 0.3 mol (C) Epoxy resin composition containing appropriate amount of curing accelerator The present invention relates to a light emitting element or light receiving element sealing body obtained by casting an element in a polycarbonate case.

The epoxy resin used in the present invention is preferably a transparent one which is liquid at room temperature.

Examples of the epoxy resin type include bisphenol type epoxy resin, alicyclic epoxy resin, and hydanto-membered ring epoxy resin, with preference given to bisphenol type epoxy resin, particularly bisphenol A type epoxy resin alone or It is an epoxy resin containing at least 50% by weight.

Examples of the epoxy resin used by mixing with the bisphenol type epoxy resin include the alicyclic epoxy resin and hydantoin ring epoxy resin described above.

In the present invention, those having an epoxy equivalent of about 130 to 200 are generally used.

The mixed curing agent used in the present invention is, for example, polyhydric alcohol 0.02 to 0.6 hydroxyl group equivalent, preferably 0.05 to 0.3 hydroxyl group equivalent to 80 ° C to 100 ° C per 1 equivalent of anhydride group of acid anhydride.
It can be obtained by reacting for 30 minutes to 16 hours, preferably 2 hours to 6 hours.

From the viewpoint of workability, the obtained mixed curing agent is preferably liquid at room temperature, and more preferably colorless and transparent in hue.

In such a reaction, the acid anhydride group is blended in excess of the hydroxyl group, so that the acid anhydride and the ester bond-containing carboxylic acid type curing agent coexist in the reaction generation system as described above.

That is, for example, a curing agent mainly containing a curing agent represented by the following general formula coexists in the reaction-forming system obtained by the above operation using a dicarboxylic acid and a dihydric alcohol.

(In the formula, R is a divalent organic group) The acid anhydride used for producing the acid anhydride curing agent or the mixed curing agent generally has a molecular weight of about 140 to 170, and is preferably Dicarboxylic acid anhydride is used.

Examples of these include hexahydrophthalic anhydride,
Examples thereof include methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride and phthalic anhydride.

The polyhydric alcohol has a molecular weight of 60 to 500, preferably 70.
The thing of about 100 is used.

As the polyhydric alcohol, a dihydric alcohol is generally used, but a trihydric or higher polyhydric alcohol can be preferably used in combination with the dihydric alcohol.

When used together, the amount of dihydric alcohol in the polyhydric alcohol is
It is better to set it to 80 mol% or more.

The mixing ratio of the epoxy resin and the mixed curing agent is preferably 0.8 to 1.2 equivalents of the mixed curing agent per one epoxy equivalent of the epoxy resin.

At this time, in the mixed curing agent, both the acid anhydride group and the carboxyl group are calculated as 1 equivalent. (That is, the acid anhydride group is not calculated as 2 equivalents.) Examples of the curing accelerator used in the present invention include tertiary amines, tertiary amine salts, imidazoles, quaternary ammonium salts, and organic metal salts. Can be mentioned.

Examples of these include 1.8-diazabicyclo (5.4.
0) Undecene-7, benzyldimethylamine, 1.8
-Diazabicyclo (5,4,0) undecene formate,
Tetramethylammonium chloride, 2-ethyl-
Examples include 4-methylimidazole, tin octylate, zinc octylate, and triphenylphosphine.

The amount of the curing accelerator added is 0.1 per 100 parts by weight of the epoxy resin.
-10 parts by weight, preferably 0.5-5 parts by weight.

The epoxy resin composition used in the present invention can be obtained by mixing the above-mentioned components, preferably under heating, until a homogeneous system is obtained.

The epoxy resin composition used in the present invention is usually liquid.

In obtaining the epoxy resin composition, the above-mentioned components are
Further, a light dispersant such as silica powder, a colorant such as a dye or a pigment, and an antiaging agent can be added.

In the present invention, it is preferable to further add 2,6-di-tertiary-butyl-4-methylphenol to the above epoxy resin composition. The amount added is 0.01 to 10% by weight, preferably 0.1 to 2% by weight, based on the total epoxy resin composition.

The light emitting device or the light receiving device sealing body of the present invention can be obtained by casting a frame with a device in a polycarbonate case using the above epoxy resin composition and curing the frame.

An actual example of the sealed body is shown in FIG.

In FIG. 1, (1) is a polycarbonate case,
(2) is a light emitting element or a light receiving element, (3) is a frame,
(4) is a transparent cured epoxy resin.

The present invention will be specifically described below with reference to examples.

Parts in the examples are by weight.

Example A (Production of mixed curing agent) 90 g of hexahydrophthalic anhydride and 1.24 g of propylene glycol were charged into a reaction vessel and reacted at 100 to 120 ° C for 10 hours to produce a mixed curing agent. This product has a ratio of 0.016 mol of the ester bond-containing carboxylic acid curing agent of (B) (ii) to 1 mol of hexahydrophthalic anhydride in claim (B) (i). There is.

Example B (Production of mixed curing agent) A mixed curing agent was obtained in the same manner as in Example 1 except that the amount of propylene glycol used was 3.7 g. This product had a ratio of the ester bond-containing carboxylic acid type curing agent of 0.048 mol to 1 mol of hexahydrophthalic anhydride.

Example C (Production of mixed curing agent) A mixed curing agent was obtained in the same manner as in Example 1 except that the amount of propylene glycol used was 7.4 g. This product has a ratio of the ester bond-containing carboxylic acid type curing agent of 0.096 mol to 1 mol of hexahydrophthalic anhydride.

Examples 1 to 3 and Comparative Example The formulations shown in Table 1 below were mixed at room temperature to give liquid epoxy resin compositions.

In Table 1, DBU formic acid is a formate salt of 1.8-diazabicyclo (5.4.0) undecene-7.

Using the liquid epoxy resin compositions obtained in Examples 1 to 3 and Comparative Example, the light emitting device with a frame was cast in a polycarbonate case and cured at 85 ° C. for 120 minutes to obtain a light emitting device encapsulant. .

In the ones obtained in Examples 1 to 3, no corrosion of the polycarbonate by the epoxy resin composition was observed, and a translucent sealing body was obtained, but in the comparative example, white stripes were formed on the inner surface of the case. The shape was seen and the translucency was not good.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a light emitting element or light receiving element sealing body of the present invention. 1 ... Polycarbonate case 2 ... Light emitting element or light receiving element 4 ... Transparent cured epoxy resin

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H01L 23/31 31/02

Claims (1)

[Claims] 1. An epoxy resin (B) (i) 1 mol of an acid anhydride curing agent is reacted with (ii) 1 equivalent of an acid anhydride group of an acid anhydride and 1 equivalent of a hydroxyl group of a polyhydric alcohol. The resulting ester bond-containing carboxylic acid curing agent is a mixed curing agent composed of 0.01 to 0.3 mol (C). A light emitting element or a light receiving element is cast in a polycarbonate case using an epoxy resin composition containing an appropriate amount of a curing accelerator. A light-emitting element or light-receiving element sealed body.