Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-01-31
1993-02-23
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523219, 523443, 523444, C08K 906
Patent
active
051890801
ABSTRACT:
An encapsulating resin composition for electrical and electronic components consists of cycloaliphatic epoxy resin, a hardener, an accelerator, a filler and, sometimes, a pigment. As a result of the combination of the cycloaliphatic epoxy resin with the provision of methylnadic anhydride as hardener and amporhous SiO.sub.2 as a filler, the material is capable of flowing at room temperature, is physiologically harmless and also otherwise well suited for mass production of a wide variety of electrical and electronic components, for example diodes and other semi-conductors for the motor vehicle industry. A small addition of hollow glass spherical particles counteracts sedimentation of amorphous SiO.sub.2 in pre-hardening storage of the resin.
REFERENCES:
patent: 3849187 (1974-11-01), Fetscher et al.
patent: 4552907 (1985-11-01), Sato et al.
patent: 4665111 (1987-05-01), Hussain et al.
patent: 4772644 (1988-09-01), Itoh et al.
Katz et al; Handbook of Fillers and Reinforcement for Plastics; van Nostrand Reinhold Co.; 1978; pp. 326-327.
Heyke Klaus
Jennrich Irene
Pfander Werner
Seidel Hans-Joachim
Spitz Richard
Cair Edward
Michl Paul R.
Robert & Bosch GmbH
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