Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-09-25
1997-11-04
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
521146, 525 64, 525 69, 525 70, 528176, 528196, C08G 6348
Patent
active
056840870
ABSTRACT:
This invention relates to a process for producing granulated polymer materials from polymer solutions, in which organic solvent of the polymer solution is evaporated in a heat exchanger, optionally with the admixture of steam, or in a holding tube with the admixture of steam, and the paste-like mixture of concentrated solution, solvent vapour and optionally of condensed steam is separated in a separator provided with rotating built-in components for cleaning off the walls. The pre-concentrated polymer solution is further concentrated in the separator by supplying heat by way of heating the separator walls or the rotating built-in components and by the shearing energy of the rotating built-in components.
Residual degassing of the solvent is effected before granulation, e.g. in the discharge extruder of the separator which is provided with rotating built-in components, through one or more degassing zones, optionally by the additional admixture of entraining media, such as inert gas or steam, for example.
REFERENCES:
patent: 2992679 (1961-07-01), Twaddle
patent: 3508339 (1970-04-01), Neblett
patent: 4198265 (1980-04-01), Johnson
patent: 4808262 (1989-02-01), Aneja et al.
patent: 5407266 (1995-04-01), Dotsch et al.
Bamberger Thomas
Casper Clemens
Kohlgruber Klemens
Obermann Hugo
Wulff Claus
Bayer Aktiengesellschaft
Mosley Terressa
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