Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating
Patent
1985-04-03
1986-09-02
Michl, Paul R.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
264 26, 264 83, 264 85, 26433118, B29D 1100
Patent
active
046095071
ABSTRACT:
The invention pertains to a method for casting polymeric gels from volatile mixtures of monomers in open molds and to apparatus for performing this method.
The principle of the invention resides in the fact that the same concentrations of volatile components present in the polymerization mixture are also present in the gaseous state within a protective gas maintained above the free surface of the polymerization mixture, said gaseous volatile components being in the equilibrium state with those in the polymerization mixture at polymerization temperature.
The apparatus for performing said method comprises a main pipe branch which introduces a pure protective gas into a polymerization apparatus and at least one auxiliary pipe branch for saturating the protective gas with a volatile component. These main and auxiliary pipe branches are formed by an inlet pipe connected to a control valve for setting a constant volume flow-rate and further leading to a device for measurement of the flow rate, where their outlet pipes are connected to a common inlet entering the polymerization apparatus and a saturator for a pure volatile component of the monomer mixture is arranged within the auxiliary branch before the outlet pipe.
REFERENCES:
patent: 2935372 (1960-05-01), Steuber
patent: 3333034 (1967-07-01), Muller
Wichterle Ivan
Wichterle Otto
Ceskoslovenska akademi ved
Michl Paul R.
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