The present invention relates to a continuous process for preparing a comb polymer, without organic solvent, by esterification and/or amidification of an acidic homopolymer or copolymer, which consists in performing the esterification and/or amidification of said homopolymer/copolymer by reaction at elevated temperature in the mixing and transportation zone of a tubular reactor, optionally equipped with a water removal system, in the presence of at least one poly(alkylene glycol) in solid or molten form and of an antioxidant, said esterification and/or amidification taking place at a temperature greater than or equal to 170° C.

A self-cleaning extruding apparatus with two co-rotating screws and the method thereof are provided here. Said apparatus is comprised of a screw mechanism, a barrel (1), a feeding port (10), a venting port (11), and a discharge port (12). Said screw mechanism is comprised of the first screw with one tip (3) and the second screw with two tips (4). There is a baffle in the channel of the first screw and the baffle's height is lower than that of the screw flight. The baffle will cause hyperbolic perturbation in the shape of a ‘figure 8’ flow pattern above the top of the baffle. The first and second screws rotate at the same speed and touch each other at all times, thereby achieving a self-cleaning function.

The baffle will generate chaotic mixing in the screw channel caused by the hyperbolic perturbation. Topological chaos is also introduced into the screw channel by the mechanism ‘one part divided into two parts, then two parts converging into one part, and then one part divided into two parts once more’. Each of the screws in the present invention uses an asymmetrical flow channel geometrical shape, such that a periodic action like ‘compression—expansion—further compression—expansion further’ works. The above three enhancement mechanisms work together to efficiently accelerate melting and mixing.

The invention relates to an apparatus for the pretreatment and subsequent conveying or plastification of plastics, with a container with a mixing and/or comminution implement that is rotatable around an axis of rotation, wherein, in a side wall, an aperture is formed, through which the plastics material can be removed, a multiscrew conveyor being provided, with at least two screws rotating in a housing, wherein the imaginary continuation of the longitudinal axis of the conveyor in a direction opposite to the direction of conveying passes the axis of rotation, where, on the outflow side, there is an offset distance between the longitudinal axis of the screw closest to the container and the radius that is parallel to the longitudinal axis, and in that the two screws closest to the intake aperture are counter-rotating relative to one another.

A composition includes (a) a polypropylene or a polypropylene copolymer, (b) a polycarbonate polyol, and (c) optionally an organic peroxide. The polyol (b) is in the range of from about 0.01 wt. % to about 25 wt. % of the total weight of (a), (b) and (c). The method of making such a polymer composition, the method of using such a polymer composition, and a sheet or a fabricated article comprising such a polypropylene composition, are also provided.

A vent assembly device for a twin-screw extruder includes a vent assembly (7) that has a vent opening (6) and that is provided in a cylinder (1) of a twin-screw extruder (11) having a left axis-side screw (2) and a right axis-side screw (3). The size of at least the vent opening (6) of the vent assembly (7) can be freely modified by forming the vent assembly (7) from a plurality of vent assembly units (7a) and by providing the plurality of vent assembly units (7a) for one vent opening (6).

A screw includes a screw main body, a conveyance portion conveying a raw material, and a passage provided in the screw main body. The passage includes a first passage element, a second passage element, and a third passage element. The screw main body has a plurality of cylindrical bodies arranged in an axial direction of the rotating shaft. At least a portion of the conveyance portion is formed on outer peripheral surfaces of the cylindrical bodies adjacent to each other, and the passage is formed in the cylindrical body so as to cross over between the adjacent cylindrical bodies.

A liquid crystal polyester composition contains: a liquid crystal polyester in an amount of 100 parts by mass as well as a fibrous filler and a plate-like filler in an amount of not less than 65 parts by mass and not more than 100 parts by mass in total. The fibrous filler in the composition has a number average fiber diameter of not less than 5 μm and not more than 15 μm and a number average fiber length of more than 200 μm and less than 400 μm. The mass ratio of the fibrous filler to the plate-like filler in the composition is not less than 3 and not more than 15. The flow starting temperature of the composition is not lower than 250° C. and lower than 314° C.

Methods for granulating a pharmaceutical powder in a single piece of equipment include at least the following: (a) continuously introducing the pharmaceutical powder and a granulating fluid to the single piece of equipment, (b) passing the pharmaceutical powder and the granulating fluid through a granulating zone of the single piece of equipment to form wet granules, (c) passing the wet granules through a drying zone of the single piece of equipment, (d) optionally passing granules through a discharge zone of the single piece of equipment, and (e) continuously discharging the granules from the single piece of equipment where the single piece of equipment is not a fluid bed processor.

Methods for granulating a pharmaceutical powder in a single piece of equipment include at least the following: (a) continuously introducing the pharmaceutical powder and a granulating fluid to the single piece of equipment, (b) passing the pharmaceutical powder and the granulating fluid through a granulating zone of the single piece of equipment to form wet granules, (c) passing the wet granules through a drying zone of the single piece of equipment, (d) optionally passing granules through a discharge zone of the single piece of equipment, and (e) continuously discharging the granules from the single piece of equipment where the single piece of equipment is not a fluid bed processor.

A dry granulation process using a twin-screw extruder for granulating a powder mixture which includes at least one active ingredient and at least one carrier. The process includes steps of kneading the powder mixture in the screw barrel of the twin-screw extruder at a barrel temperature below a melting point of the at least one active ingredient and a melting point or a glass transition temperature of the at least one carrier to provide a kneaded powder mixture, and extruding the kneaded powder mixture to form granules. Granules and tablets produced using the dry granulation process in the twin-screw extruder are also provided.