Method for the preparation of transparent casting resins

Details Method for the preparation of transparent casting resins Method for the preparation of transparent casting resins

1981-04-16

1982-12-21

Nielsen, Earl A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528 89, 528115, 523451, C08G 5968

Patent

active

043650520

ABSTRACT:
The invention relates to a method for the manufacture of transparent casting resins. According to the invention, a liquid acid anhydride (b) is admixed to a premixture (a), which is liquid at room temperture, of zinc octoate, a low-molecular weight acid ester and, optionally, an organic phosphite, and this mixture of (a) and (b) is added, preferably at temperatures .ltoreq.50.degree. C., to liquid aromatic diglycidyl ethers. Diphenyldecyl phosphite is particularly well suited as an organic phosphite. The casting resins obtained are transparent and find use particularly for casting-in and encapsulating opto-electronic components such as light-emitting diodes (and diode displays), photo diodes and photo transistors.

REFERENCES:
patent: 3477971 (1969-11-01), Allen et al.
patent: 3544827 (1970-12-01), Witterick
patent: 4013987 (1977-03-01), Foster
patent: 4178274 (1979-12-01), Denk et al.

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