Method of producing polyurethane foams for low stress encapsulat

Details Method of producing polyurethane foams for low stress encapsulat Method of producing polyurethane foams for low stress encapsulat

1986-07-21

1987-09-29

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 467, 264 50, 26427211, 26427213, 264DIG5, 264DIG7, 521 54, 521137, B29C 6700

Patent

active

046967761

ABSTRACT:
A method for encapsulating electronic components in high acceleration and high thermal cycling environments. A liquid uncured thermal setting polyurethane formulation is mixed with a finely ground particulate foam which serves as a nucleating agent. The mixture is in accordance with the polyurethane formulation. The resultant foam contains open air pockets which allow it to be compressed and then re-expand.

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patent: 3772219 (1973-11-01), Schwarz
patent: 4231986 (1980-11-01), Brauer et al.
patent: 4355130 (1982-10-01), Heinze
patent: 4533598 (1985-08-01), Downey et al.

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