The present invention relates to a thermoplastic silicone-polyurethane elastomer and a method for preparing the same. The elastomer is prepared from raw materials comprising: 25-80 parts of a macromolecular polyol, 0-60 parts of a silicone oil or a liquid silicone rubber, 10-50 parts of a diisocyanate, 3-20 parts of a small molecular diol as a chain extender, and 0.1-3 parts of an auxiliary agent. The macromolecular polyol is selected from a silicon-free polyol having a molecular weight of between 1,000 and 4,000 g/mol and a polyol modified by silicone through copolymerization or grafting. The small molecular diol is a small molecular diol comprising 10 or less carbon atoms. The thermoplastic silicone-polyurethane elastomer of the present invention has the following excellent performance parameters: a hardness of Shore A40-D80; a tensile strength ≥5 MPa; smooth hand feeling; resistance to dirt such as dust; resistance to liquid permeation; no irritation to skin; good encapsulation effect on PC, ABS, TPU and the like; and a 180° peel strength >25 N/25 mm.

A heavy load vortex internal apparatus is provided having a vibration channel for receiving plastic granular material. The vibration channel has a channel floor and two side walls opposite each other, where the length of the vibration channel is greater in the longitudinal direction than the maximum height and width of a channel cross section perpendicular to the longitudinal direction. At least two vibration generators are provided for generating a vibration excitation having a transverse component perpendicular to a vertical plane in the longitudinal direction. At least two channel carriers are spaced apart from each other in the longitudinal direction, each supporting the channel floor and the side walls from the outside and bridging the vibration channel opposite the channel floor. One of the vibration generators in each case is fastened to at least two of the channel carriers. Also provided is a method for crystallization of plastic granular material.

Disclosed herein is a system comprising a first pump; a pelletization system that comprises an underwater pelletizer; where the pelletization system is located downstream of the first pump and is in fluid communication with it; a direct line that is located downstream of the first pump and upstream of the pelletization system; where the direct line does not contain a pump or a heat exchanger; and a bypass line that is located downstream of the first pump and upstream of the pelletization system; where the bypass line comprises a second pump; where the first pump is operative to discharge the polymer to the pelletization system via the direct line when the polymer has a melt viscosity greater than 10.sup.5 centipoise; and where the first pump is operative to discharge the polymer to the pelletization system via the bypass line when the polymer has a melt viscosity less than 10.sup.5 centipoise.

The invention relates to a nontacky film-forming polymer composition (cover material), and tacky hot melt adhesives in the form of pellets which are coated with the polymer composition and producible by coextruding the hot melt adhesive and the cover material. The film-forming composition comprises 5 to 40% by weight of at least one Fischer-Tropsch wax having a melting point of >95° C. and 30 to 70% by weight of at least one metallocene-catalyzed polyolefin having a softening point of >95° C. and a melt flow index (MFI) (230° C., 2.16 kg) of ≦1000 and ≧300 g/10 minutes. The invention further relates to suitable uses for such hot melt adhesives, methods for their use, and products containing these adhesives.

A granulation apparatus for granulating a plastic material is provided. The granulation apparatus has a fixed support extending along a vertical axis, a rotating support, connected in a rotatable manner to the fixed support, and actuatable in rotation about a first direction parallel or coincident with the vertical axis, a die connected to an extruder, a cutting assembly suitable for facing the die and constrained to the rotating support so that, by rotating the rotating support around the first direction, the cutting assembly also rotates around that first direction. In one embodiment the cutting assembly is slidably constrained relative to the rotating support. In a further embodiment the cutting assembly is supported in a cantilevered manner by the rotating support. A maintenance method for the granulation apparatus and a granulation method for a molten plastic material are also provided.

The present invention relates to a melt processable thermoplastic polyurethane-urea composition formed by a continuous bulk process without the presence of solvent using a polyol component, an isocyanate component, and chain extender component comprising a hindered aromatic diamine.

A cutter head for an underwater granulating installation has a rotor body having a plurality of cutter-retaining arms. Each of the plurality of cutter-retaining arms adjoins the outer circumference, and one cutter element is fastened on each of the plurality of cutter-retaining arms, where the rotor body in the region of each cutter-retaining arm includes at least one receptacle recess configured to receive a fastening element. The cutter element is integrally configured to have a basic body and at least one blade body. The basic body is positioned on a lower bearing face of the rotor body, and the lower bearing face extends up to at least one of the plurality of cutter-retaining arms. The at least one of the plurality of cutter-retaining arms on an upper side is overlapped by the cutter element, and the blade body includes at least one cutting edge molded thereon.

Solid state draw a laminated polymer billet containing two or more polymer compositions laminated to one another to prepare an oriented polymer composition.

The present invention relates to water and solvent-free polymers, in particular water and solvent-free synthetic rubber products like non-halogenated and halogenated butyl rubber products as well as a process for the production thereof. The invention further relates to a device suitable to accomplish said process.

The present invention provides a process for extruding and pelletising a propylene copolymer. The copolymer has a content of comonomer from 5 to 40% by mole, a melt flow rate MFR.sub.2 measured at 230° C. under a load of 2.16 kg of from 0.5 to 15 g/10 min and a content of cold xylene soluble material of from 20 to 60% by weight. The process comprises extruding the propylene copolymer through a die plate into an underwater pelletiser and cutting strands of the propylene copolymer into pellets in the underwater pelletiser, wherein the ratio of the mass flow rate of the propylene copolymer to the mass flow rate of the cooling water is from 0.020 to 0.060; and the propylene copolymer comprises a polymeric nucleating agent.