A coated additive particle suitable for use during an olefin polymerization reaction is disclosed, the particle comprising a core of at least one additive and a coating comprising at least one wax which is solid at the polymerization temperature. A process for producing such particles is also disclosed, comprising the steps of melting the coating wax, fluidizing particles of the additive with a ho...

Porous shaped articles made from a molded composite of ultra high molecular weight polyethylene and polyethylene wax are disclosed. These articles are produced by free-sintering a non intensively mixed blend of UHMW-PE particles and particles of a polyethylene wax. The process involves mixing the UHMW-PE and wax both in powdered form until a heterogeneous mixture is formed, but under conditions wh...

The logging tool comprises a gas void fraction measurement section (37) consisting of a first set (37) of eight longitudinal electrodes (38) extending parallel to the longitudinal axis of the tool and positioned and regularly spaced around said longitudinal axis, a sleeve (40) made of dielectric material and located in contact and around the electrodes for obtaining an electric field pattern distr...

50 to 95 parts by weight starch and 5 to 50 parts by weight polyvinyl alcohol with a degree of saponification between 87 and 100% are thoroughly mixed and furthermore the moisture content of the mixture is regulated between 10 and 25 weight %. Subsequently the mixture obtained is subjected to a thermo-mechanical treatment at a temperature situated between 110 and 180 DEG C. During the extrusion th...

A method and article useful for preparing stable polysaccharide gels from aqueous solutions of water-soluble polysaccharides bearing pendant carboxylate groups. The gels produced may be of the foamed or nonfoamed variety.

Polyimide which is obtained by polymerization and consists essentially of recurring structural units of the formula (I): wherein X is a single bond or a hexafluoroisopropylidene group, is processed to a form of pellet, followed by heat-treating to obtain crystallinity of 5 % or more, and fed to an extruder to obtain articles.

A pervaporation separation method of water from an organic material aqueous solution at a high separating efficiency is effected by using a specific asymmetric separating membrane comprising a heat-resistant, solvent-soluble aromatic imide polymer prepared by the polymerization and imidization of an aromatic tetracarboxylic acid component comprising, as a principal ingredient, at least one bipheny...

Disclosed is an ungelled, modified chlorinated polyolefin resin suitable for providing a highly adherent, solvent resistant film on a thermoplastic polyolefin substrate. The modified chlorinated polyolefin resin is prepared by grafting an unsaturated polycarboxylic acid and/or an unsaturated acid anhydride onto a chlorinated polyolefin resin to form an acid- and/or anhydride-modified chlorinated p...

A pelletized mixture of gypsum, carbonaceous material and pyrite is charged to a travelling grate where the charge is heated under suitable conditions to produce a solid sintered material which has a broad spectrum of applications due to its chemical and physical properties and a gaseous effluent containing sulfur dioxide, sulfur or mixtures thereof.

The metal is surface-plated with a ternary plating alloy comprising Cu (60 - 70 wt%), Ni (4 - 14 wt%) and Zn (the rest). The Zn amt. is controlled as follows. The top surface of the plating contains 4 wt% or less of Zn, to a depth of 50 angstroms the plating has an increased amount of Zn, and when the depth is greater than 50 angstroms the amount of Zn lies between 4 and 14 wt%. The composite is o...

A control system for a power train provided in a vehicle to include an engine (1) which has an engine output adjusting device (3), such as a throttle valve, controlled through an electric actuator (4) in accordance with a controlled variable on an accelerator and an automatic transmission (5) in which a speed change operation is automatically performed by means of operating oil pressure produced i...

A silicone rubber spring block foamed with a closed-cell structure is produced by mixing the highly viscous and viscid silicone rubber compound with air and immediately following this by crosslinking in vacuo. In comparison with corresponding open-cell natural rubber springs with the same spring characteristics, the foamed silicone rubber spring block has a much improved temperature resistance, im...

Thermoplastic foams are produced by mixing the plastic, such as polymethyl methacrylate or a polymethacrylalkylimide polymer, with magnesium hydroxide and/or aluminium hydroxide or silicic acid as blowing agent in the melt and heating the mixture until it expands and cooling the foam to below the softening point. If necessary, the mixture is heated under pressure and expanded by decompression.

The gas-discharge switch contains at least two main electrodes for a low-pressure gas discharge. The distance d between the main electrodes and the pressure p of an operating gas are selected such that the ignition voltage reduces as the product pxd increases. According to the invention, the discharge path (8) is allocated a hollow electrode (10) which is connected to a trigger voltage source (17)...

Smooth, glossy, polyethylene films with a high strength and modulus and a low creep, opacity and porosity are prepared by converting at high temperature a 1-40%(wt) solution of a polyethylene with Mw>/=4 x 10<5> in a volatile solvent into a film, converting this film via thermoreversible gelling into a gel film and subjecting this gel film at a temperature above 75 DEG C to ultra-high, uni-axial s...

This invention relates to heat-resistant polyimide blends and molded parts thereof, which have excellent heat and moisture resistance, are relatively soluble in organic solvents, have excellent mechanical processibility, and are suited for laminating and molding. The blends contain a thermoplastic polyimide component and a thermosetting imide oligomer. The weight ratio of the thermoplastic compone...

In a method of weaving a three-dimensional article according to the present invention, an area arranging carrier members (1) in the form of a matrix is segmented into a plurality of rectangular blocks (G1 to G6) to choose prescribed blocks therefrom, and then a basic weaving operation is sequentially and alternately performed with respect to the prescribed blocks. According to the weaving method, ...

A steerable wheel drive for industrial trucks, especially fork-lift trucks is described with a transmission (23) and a drive motor (3) assigned to this, a steering motor (20), a planetary differential gear (1) with a central axis of rotation (5), the planetary differential gear (1) being driven by the drive motor (3), and a set of bevel gears (2) comprising at least one bevel gear stage per output...

A method is disclosed for forming a capacitor on a semiconductor wafer. A first electrically conductive layer is applied atop the wafer and engages exposed active areas. A first dielectric layer is next applied. The first dielectric and conductive layers are then patterned to define an outline for the lower capacitor plate. A second dielectric layer, having an etch rate which is slower than the fi...