Abstract: Method and apparatus for the post reaction treatment of resins produced by fluidized bed polymerization of alpha olefins wherein an extruder is coupled in communication with the reactor and all necessary devolatilization of monomer, deactivation of catalysts and addition of additives are performed in the extruder.

Abstract: Finely divided, gel-like crosslinked polymers are prepared by a continuous method in which a monomer mixture which contains, per 100 parts by weight of acrylic acid or methacrylic acid, from 50 to 100 mol % of which in each case are neutralized, acrylamide, methacrylamide or N-vinylpyrrolidone, from 0 to 30 parts by weight of other water-soluble monoethylenically unsaturated monomers and from 0 to 20 parts by weight of water-insoluble monoethylenically unsaturated monomers is copolymerized with from 0.01 to 5 parts by weight of a crosslinking agent, in 20-65% strength by weight aqueous solution in the presence of an initiator at from 45.degree. to 95.degree. C.

Abstract: A continuous reactor for forming polymeric materials from reactive components for use in a system for mixing monomeric materials and the process of operation of the continuous reactor and system.

Abstract: Spheroidal polymer beads having a uniform size are prepared by polymerizing uniformly sized monomer droplets formed by vibratory excitation of a laminar jet of monomeric material flowing in a gas phase. For example, a laminar jet of a monomer mixture comprising styrene, divinylbenzene and a polymerization initiator can be subjected to vibratory excitation and the resulting monomer droplets polymerized to yield copolymer beads having a narrow particle size range distribution. The copolymer beads can be employed in applications where beads having diameters of 5 .mu.m to 100 .mu.m are useful.

Abstract: An improved process for preparing a sticky water-soluble polymer, e.g. acrylamide polymers and acrylic acid polymers, which comprises polymerizing an aqueous solution of a monomer in a polymerization vessel of which the surface contacting the aqueous monomer solution is covered with a tetrafluoroethylene-ethylene copolymer film, whereby the stickiness of the produced polymer to the vessel is remarkably decreased, namely the peelability of the polymer from the vessel is remarkably improved, and moreover the polymerization conversion is remarkably improved. Also, the use of a metal deposited tetrafluoroethylene-ethylene copolymer film as a covering material improves the efficiency of a photopolymerization and enables to use a polymerization vessel made of an inexpensive material.

Abstract: The invention relates to a device and process permitting of the bottom drainage of a fluid-bed polymerization reactor (1) comprising a fluidization plate (2), a gas inlet (3) located between the said plate and the bottom of the reactor and a side pipe (4) located above the said plate and permitting of the evacuation of the fluidized particles, the said device consisting:of a vertical pipe (5) having a top opening at the level of the plate and a bottom end located outside and underneath the bottom of the reactor, which is occluded by a cock (6),and a gas intake tube (7) in the said vertical piping, leading out into the immediate vicinity of the said cock (6).

Abstract: Invert emulsion polymers are prepared by continuously circulating a system comprising a non-polar liquid and an aqueous solution of polymerizable monomers, continuously adding components to said system and continuously withdrawing a portion of said system comprising the desired invert emulsion polymer. The method is conveniently effected in a loop reactor. It is particularly effective for the production of invert emulsion polymers of acrylamidoalkanesulfonic acids and their salts; e.g., 2-acrylamido-2-methylpropanesulfonic acid.

Abstract: A process for the preparation of polyisobutylene by polymerizing isobutylene in a polymerization zone which is at from 0.degree. to -130.degree. C., by means of from 0.01 to 1.0 percent by weight of boron trifluoride catalyst, in the presence of a primary or secondary alcohol as polymerization accelerator and in the presence of from 30 to 90% by weight of a low-boiling solvent which is inert under the reaction conditions, wherein the solvent vaporized during the polymerization is continuously drawn off, liquefied and recycled, in the liquid state, to the polymerization zone, and wherein the boron trifluoride catalyst used contains less than 0.3, in particular less than 0.01, percent by volume of silicon tetrafluoride and the solvent, which is preferably ethylene, is recycled not less than twice but not more than 36 times during the continuous polymerization.

Abstract: Continuous bulk polymerization of thermoplastic resins is carried out by using a horizontal continuous polymerizer comprising a cylindrical body, one or more shafts having the stirring elements and disposed in said body, a material inlet provided at an end of said body in its longitudinal direction, and a material drawing means and an outlet provided at the other end of said body. A monomer is evaporated from a polymerization solution while controlling the pressure in said polymerizer at a predetermined level and, concurrently with this, a monomer is directly sprayed to the free surface of the polymerization solution in the polymerizer from several locations of said polymerizer in its longitudinal direction, whereby to eliminate the heat of polymerization reaction and the heat of stirring to allow progress of the polymerization reaction under a predetermined temperature condition.

Abstract: A polymerization autoclave for the suspension polymerization of vinyl compounds in the aqueous phase having a volume of from 50 to 200 m.sup.3, an impeller agitator driven from below at the bottom of the autoclave and two cylindrical displacement bodies acting as flow interrupters, secured downwardly from the autoclave dome, where the autoclave has a height-to-diameter ratio of from 2.4 to 3 with a critically dimensioned agitator and critically dimensioned flow interrupter fittings. By the use of this invention in the case large-scale autoclaves, the heat of polymerization can be removed merely by wall-cooling. The autoclave according to the invention are very economical, as shown by, for example, a spatial capacity of 0.3 to 0.4 metric tons of polyvinyl chloride per m.sup.3 autoclave volume.

Abstract: A continuous process is provided for producing substantially homogeneous, non-tacky solid terpolymers of acrylamide, an alkali metal salt of acrylic acid and a hydroxyalkyl acrylate, and copolymers, optionally cross-linked, of a (meth)acrylamidoalkylsulfonic acid or alkali metal salt thereof and (meth)acrylamide or N-alkyl(meth)acrylamide, by rapidly heating a single phase high solids aqueous solution of the monomers to polymerization initiation temperature immediately prior to depositing a uniform layer of the solution and, at the same time, a solution of a polymerization initiator, onto a moving surface, the surface and the reaction mixture only being heated if necessary to keep the temperature of the polymerizing mixing from dropping substantially below the polymerization initiation temperature.

Abstract: A powdered copolymer of an ethylenically unsaturated compound having a terminal double bond such as diisobutylene, styrene, an acrylate or an methacrylate and maleic anhydride or an ester thereof can directly be obtained by a polymerization process which comprises polymerizing the monomer mixture in a kneader or a Banbury type mixer in the presence or absence of a poor solvent for the copolymer to be produced to form a highly viscous resin phase containing the copolymer produced and the starting monomers dissolving said copolymer, kneading the highly viscous resin phase, proceeding further the polymerization reaction while kneading and shearing the resin phase to produce solid aggregates, and powdering said aggregates to produce a powdered copolymer.

Abstract: A process for the production of a pulverulent, tricklable mixture of ethylene/vinyl acetate copolymer and polyvinylchloride comprising the steps of mixing a mixture consisting essentially of (a) an ethylene/vinyl acetate copolymer having an acetate content of from 15% to 75% by weight, (b) powdery polyvinylchloride, in a mixture ratio of (a) to (b) of 1:3 to 2:1, and (c) from 0 to 5% by weight of the mixture of additives customary for polymer processing, in a high-speed mixture at temperatures above the softening temperature of said polyvinylchloride and below 170.degree. C., for a time sufficient to effect homogenization, quenching said homogenized mixture with water and removing the water, grinding the quenched product with the addition of from 0.5 to 10 parts by weight of an inert powder having particles in the submicroscopic range, in a high speed mill under passage of an airstream which is heated by friction, and recovering said pulverulent, tricklable mixture; as well as the powdery mixture so produced.