Process for preparing propellant compositions forming foamed str

Details Process for preparing propellant compositions forming foamed str Process for preparing propellant compositions forming foamed str

1980-10-27

1982-05-04

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

52298, 106122, 106170, 128272, 132DIG3, 264 53, 264DIG16, 264DIG17, 424 68, 424 70, 521 79, 521 88, 521 98, 424 78, 252 91, C08J 912, C08J 926, C08J 930

Patent

active

043283195

ABSTRACT:
A process is provided for preparing propellant compositions including a film-forming synthetic polymer that are capable of forming foamed structures containing open and/or closed cells, which may optionally contain a material which is deposited in the pores and/or walls of the structure as the structure is formed, which comprises coating the synthetic polymer in particulate form with an inert solid material insoluble in the propellant and in solutions of the synthetic resin the propellant at atmospheric temperature; and then adding the propellant and dissolving the synthetic polymer in the propellant. The process is of particular application for preparing such synthetic polymer-propellant compositions in situ in closed containers capable of withstanding an internal pressure sufficient to keep the propellant in the liquid phase at atmospheric temperature, and when the composition is withdrawn from the container to atmospheric pressure, the propellant volatilizes rapidly and a foamed structure is formed within a few seconds.

REFERENCES:
patent: 3572330 (1971-03-01), Gander
patent: 3705669 (1972-12-01), Cox et al.
patent: 3912665 (1975-10-01), Spitzer et al.
patent: 3912666 (1975-10-01), Spitzer et al.
patent: 3912667 (1975-10-01), Spitzer et al.

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