Abstract:
A twin screw extruder (10) according to the present invention is a twin screw extruder (10), in which a reinforcing fiber is fed through an input port (18) into a molten thermoplastic resin having been formed in a resin feed part (13) and the reinforcing fiber and the molten thermoplastic resin pass through a kneading part (15) so that a fiber-reinforced resin composition is manufactured, wherein the kneading part (14) is provided at the discharge-side end part of the extruder (10); a conveying part (14) is provided between the input port (18) and the kneading part (15), and tip clearance (Sc) of a screw element (12b) configuring the conveying part (14) is larger than screw clearance (Ss).
Abstract:
An improved process for dispersing filler particles in a resin composition is disclosed. The filler particles, for instance electrically conductive or metal particles, are mixed with a resin material or blend of materials including a resin material to form a mixture that is subjected to an acceleration force. The acceleration force can be generated by passing the mixture through a static nozzle having particular dimensions to generate an acceleration of the mixture in the nozzle in excess of 400,000 m/sec2. The treated particles become uniformly dispersed in the resin composition and a reduction in average particle size of the filler material can be achieved.
Abstract:
Process for producing a pressure-sensitive adhesive comprising expanded microballoons, wherein the constituients for forming the adhesive are mixed in a first mixing assembly, the mixed adhesive is transferred into a second mixing assembly into which, at the same time, unexpanded microballoons are fed, the microballoons are expanded in the second mixing assembly or on exit from the second mixing assembly, the adhesive mixture with the expanded microballoons is shaped to a layer in a shaping assembly in which expanded microballoons which have broken through the surface are pressed into the layer surface and the layer of adhesive mixture together with the expanded microballoons are optionally applied to a weblike backing material.
Abstract:
An inventive process for the production of a composite polymer material is provided allowing for the preparation of a composite polymer material with high filler content which may be used as a masterbatch.
Abstract:
A wet mix elastomer composite comprising carbon black dispersed in an elastomer including a blend of a natural rubber and styrene-butadiene rubber. When the wet mix elastomer composite is processed with CTV Method 1, the vulcanized wet mix elastomer composite exhibits a resistivity that A) has a natural logarithm satisfying the equation ln(resistivity)≧−0.1(loading)+x, where x is 14, or B) is at least 2.9 times greater than the resistivity of a vulcanized dry mix elastomer composite having the same composition and prepared using Comparative CTV Method 1.
Abstract:
The present invention relates to a multicolor decorative welding rod (3) and a method to produce a multicolor decorative welding rod, said welding rod comprising a PVC-based component A and a PVC-based component B, in a ratio of component A/component B comprised between 10/90 to 50/50, said components A and B being associated in such a way that the composition of said component A comprises a PVC having a higher melt viscosity and/or a higher melting point, than the PVC of said component B, said components A and B being of a different color.
Abstract:
Tyres for vehicle wheels having reduced environmental impact and the components thereof, in particular reinforcing structural elements such as carcass structures, belt structures, flippers and chafers, include elongated reinforcing elements treated with resorcinol and formaldehyde-free cross-linkable adhesive compositions. The adhesive compositions include at least a) a rubber latex, at least b) an epoxide and at least c) a polyamine with molecular weight higher than 190 Daltons, including at least two amino groups selected from primary —NH2 and secondary —NH— amino groups. In the structural element, these compositions confer an adhesion between cords and compounds that is comparable to, if not better than, the traditional RFL system in use in this sector. Furthermore, by suitably modifying the compound compositions in the reinforced structural elements and, possibly, also in the other elastomeric components of the tyre, it is possible to manufacture tyres while avoiding the use of toxic chemicals, such, as resorcinol and formaldehyde.
Abstract:
A method of producing a coagulated latex composite. A coagulating mixture of a first elastomer latex and a particulate filler slurry is flowed along a conduit, and a second elastomer latex is introduced into the flow of the coagulating mixture.
Abstract:
A method for making a thermoplastic material includes: (a) partially crosslinking an elastomer composition at a first crosslinking temperature to form a thermoplastic, partially crosslinked elastomer composition; (b) mixing a thermoplastic polymer composition with the thermoplastic, partially crosslinked elastomer composition and heating the mixture to a second crosslinking temperature higher than the first crosslinking temperature, wherein the thermoplastic polymer composition is liquid at the second crosslinking temperature; and (c) continuously mixing the mixture while further crosslinking the elastomer composition to form a thermoplastic material having a dispersed phase of crosslinked elastomer composition in the thermoplastic polymer composition. The elastomer composition may include an elastomer compounded with a curing agent and optionally additional components. A thermoplastic material resulting from this process may be molded or shaped by any method used for forming thermoplastic materials into articles, such as molding, extrusion, or thermoforming.
Abstract:
Method for the production of an initial rubber composition, in the course of which the following steps are carried out in succession: A—a rubber matrix, reinforcing fillers, and other components if required, with the exception of the cross-linking system, are introduced into a mixing means of the internal mixer type, comprising a mixing chamber in which there are mounted rotors which are driven in rotation and have radial projections forming a gap (e) between themselves and the vessel, B—said components are mixed in the chamber until a uniform mixture is obtained, care being taken to ensure that the temperature of the mixture remains at or below 170° C., after which C—the rotation speed of the rotors is adjusted so as to bring the rubber composition to a dropping temperature in the range from 180° C. to 240° C., in a time of less than 600 seconds, and preferably less than 400 seconds, and D—when the dropping temperature has been reached, the initial rubber composition is removed from the internal mixer and the temperature of said composition is brought below 140° C. in less than 5 minutes.