Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1978-09-21
1980-09-23
Smith, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
260 296PT, C08F 616, C08F 624
Patent
active
042244374
ABSTRACT:
In the process for steam-stripping residual monomer from an aqueous polymer dispersion comprising injecting steam into an aqueous polymer dispersion containing residual monomers and the customary amounts of emulsifiers and/or protective colloids, said dispersion having a solids content of from 15% to 55% by weight with simultaneous evacuation of the gas space above the dispersion whereby said gas space is maintained at a subatmospheric pressure and said residual monomers are volatilized, the improvement consisting of injecting a sufficient volume of steam into said aqueous polymer dispersion whereby from 5% to 50% by weight of the injected steam passes through said dispersion uncondensed, thereby substantially preventing formation of foam above said dispersion.
REFERENCES:
patent: 2451332 (1948-10-01), Green
patent: 2462013 (1949-02-01), Waterman
patent: 2927065 (1960-03-01), Gerlicher et al.
patent: 4017445 (1977-04-01), Wortmann et al.
Research Disclosure, No. 137, Sep. 1975, pp. 25 and 26.
Balwe Thomas
Bauer Johann
Birke Johann
Rostock Kai
Wiedholz Rudolf
Smith Edward J.
Wacker-Chemie GmbH
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