US 4,400,236 AGranted

Rotating disc evapo-extrusion process and apparatus

AssigneeSumitomo Chemical Company, Limited

InventorsYoshimi Hanamura, Masahiro Yuyama, Akira Sakuramoto

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Abstract

An improved process for the removal of volatile components from polymer compositions containing volatile components such as unreacted monomers, solvents, by-products or impurities by a rotating disc evapo-extrusion, and an apparatus therefor. The present invention is particularly useful for the removal of the volatile components from polymer compositions having a high content of volatile components such as 25 to 99.9% by weight, particularly methyl methacrylate polymer compositions useful for the production of molding materials or extrusion plates which contain 60% by weight or more of methyl methacrylate monomer.

Claims27

Dependent claims

A rotating disc evapo-extrusion process for removing volatile components from a thermoplastic polymer composition containing volatile components, which comprises

applying a pressure sufficient to maintain the composition in substantially a liquid state and applying all or a part of the heat necessary for evaporating the volatile components to the composition,
supplying the pressured and heated composition to a rotating disc evapo-extrusion machine, in which a rotor and a stator are provided with substantially parallel opposed faces separated by a fixed space and the inner pressure is maintained at from 5 Torr to 1,500 Torr, said pressured and heated composition being supplied through a pore in said stator and being directly blown onto the face of the rotor,
thereby separating and recovering a majority of the volatile components from the peripheral part of the rotor, and
transferring, with heating, the polymer composition toward the central area of the face of the rotor by a hydrodynamic pressure produced by the rotation of the rotor, whereby remaining volatile components are separated and recovered from the peripheral part of the rotor and polymer composition is recovered from an outlet which is provided at the central part of the face of the stator.

1 more element

A rotating disc evapo-extrusion apparatus comprising:

a first rotor and a first stator having a first rotor face and a first stator face respectively spaced from and facing each other and substantially parallel to each other;
means for maintaining a first separation space between said faces;
rotating means for rotating said rotor about its axis for producing a hydrodynamic pressure between said faces;
sealing means for sealing said axis for maintaining the inner pressure of the apparatus at a constant pressure;
an inlet opening through said stator for supplying a polymer composition to said first separation space;
inlet control means for controlling the size of said inlet opening for maintaining the pressure of the polymer composition being supplied;
a first outlet means for removing volatile components,
said inlet opening being located inwardly of said first outlet means;
a second outlet means communicating with said first separation space for removing the polymer composition from which volatile components have been removed, said second outlet means being located inwardly of said inlet opening;
a second rotor coaxial with and positioned below said first rotor and below said first stator face, said second rotor including a second rotor face and a third rotor face;
a second stator face spaced from and facing said second rotor face with a second separation space defined therebetween;
a third stator face spaced from and facing said third rotor face with a third separation space defined therebetween;
said second outlet means communicating with said second separation space;
a passage means through said second rotor and communicating with said second separation space and said third separation space;
a third outlet means for removing volatile components being located at the periphery of said third rotor face and said third stator face;
and
a fourth outlet means communicating with said third separation space for removing the polymer composition from which volatile components have been removed, said fourth outlet means being located inwardly of said passage means.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/295,304Filed 24 Aug 1981
Priority: JP 55-11890527 Aug 1980
Granted: 23 Aug 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C08F 6/00
Post-polymerisation treatments
B29B 7/845
Venting or degassing ; Removing liquids, e.g. by evaporating components: venting, degassing or removing evaporated components in devices with…
B29C 48/47
Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die: using discs, e.g. plasticising the moulding…
B29C 48/05
Characterised by the shape of the extruded material at extrusion: filamentary, e.g. strands

Family

No related US applications are recorded in the indexed filing history.

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