The present invention relates to a process and apparatus for the gas-phase polymerisation of olefins in a fluidised-bed reactor maintained at a temperature T1. A gaseous reaction mixture comprising the olefins to be polymerised passes through the reactor and is recycled to the reactor by means of a recycling line comprising successively a first heat transfer means, a compressor and a second heat t...

A public key cryptographic system is disclosed with enhanced digital signature certification which authenticates the identity of the public key holder. A hierarchy of nested certifications and signatures are employed which indicate the authority and responsibility levels of the individual whose signature is being certifified. The certifier in constructing a certificate generates a special message ...

The specification of the instant invention discloses improvements in methods for making various types of mats of fiberous material. In particular, the improvements relate to methods for making continuous fiber glass strand mats using reciprocating strand feeders and a pro4grammable motion controller to control both the rate of reciprocation and the rate at which strand is deposited from the feeder...

Disclosed herein is a porous film having a thickness of 90 mu m or less obtained by uniaxially stretching a film produced by blow-extruding a composition comprising a linear polyethylene, a filler and a radical forming agent, the bending resistance of the porous film in both the machine and transverse directions being 50 mm or less, the moisture permeability of the porous film being 1500 g/m<2>.2...

A releasable protective film consists of (A) 85-20 wt.% of a random propylene-butene copolymer iwth a MFI of 0.1-100 g/10 minutes (ASTM D 1238-65T, 230 deg.C), a propylene content of 60-85 mol.% and a heat of crystal fusion of 20-80 Joule/g determined using a differential scanning calorimeter (B) 15-8 w.% of an ethylene-alpha olefin copolymer with a MFI of 0.1-100 g/10 minutes, an ethylene content...

A repositionable pressure-sensitive adhesive comprising from about 70% to about 99% hollow, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising at least one alkyl acrylate or alkyl methacrylate ester, a majority of the microspheres having one or more interior voids having a diameter of at least about 10% of the diameter of t...

An expandable, powder coating composition is disclosed which comprises (a) a thermoplastic resin containing a coplymer of ethylene with vinyl acetate, (b) a cross-linking agent containing an organic peroxide, (c) a blowing agent, and (d) an organic plasticizer. Powder coating of a surface of a tube or box to be used in air conditioners with the coating composition can give a heat-insulating, foame...

A double-tube core drill wherein the inner tube (2) is connected to the outer tube (1) by a multi-element needle and/or ball bearing (11), allows for the inner tube (2) to be made rigid and prevents it from rotating along with the outer tube (1). The extraction device (9) and the inner wall (38) of the tube are preferably covered with an antifriction coating. A set of stabilizing elements (67) are...

The invention relates to a control system for an automatic warehousing facility (1). Receipt into and disbursement from racks (5) capable of storing goods (3) in a plurality of lots (4) are carried out by a goods handling device (7). A control panel (41) disposed at the ground side controls the handling device to control incoming and outgoing handling of goods (3). Inventory control is carried out...

Wheel brake comprising:   - at least two brake discs (1, 2);   - a pressurised brake fluid supply (19); and   - a pressure system (9, 13, 14) connected to the said brake fluid supply (19) and acting on the said brake discs (1, 2). According to the invention, this brake is characterised in that at least one (1) of the said brake discs is metal, while at least the other (2) of the said d...

Conductive structures in polymers are obtained by a method in which poly(organylheteroacetylenes) of formula I or a mixture of poly(organylheteroacetylenes) of formula I and other polymers are exposed to radiation of high energy density, preferably laser radiation. At relatively low temperatures of 100 DEG C. to 600 DEG C., the polymer structure is effected so that electrically conduc...

Saw has a blade and a housing inside which is a cold water spray system. A spray pipe is provided inside the housing and is supplied with a disinfecting fluid after each cutting operation in order to clean and disinfect the blade and the housing. The spray pipe extends across the width of the housing, and may be fitted with pipe branches. It may also have a right-angled shape in the area in which ...

In producing a solvent-contg. electrical insulating impregnating lacquer, esp. one based on polyesterimide- and phenolic resins, from spent epoxide resin, esp. impregnating resin based on dianepoxide resin contg. anhydride hardeners, (a) the spent resin is (gradually) diluted with xylene or butanol; and (b) heated to 50 +/- 10 deg. C.; (c) the spent resin is then gradually added to a known common ...

Internal lubricant mixtures for PVC foils produced according to a low-temperature process contain (A) partial esters of oligomers of trivalent to hexavalent aliphatic alcohols with at least 2 monomer units and monocarboxylic acids, 5 to 75 % of the hydroxyl groups of the oligomers being esterified, and (B) complex esters of (a) dicarboxylic acids with 2 to 22 C atoms; (b) aliphatic polyols with 2 ...

The mounting arrangement provides that means for wedge connection (30, 34, 37, 44) are constructed on a side wall (39) of the apparatus housing (4) and on the unit (2) which is to be mounted, and that a screw connection is provided having at least one countersunk screw (27). In this case, the screw connection is arranged in such a manner that its axis is at right angles to the operating direction ...

Layered products formed from fabrics of high modulus fibre material with improved antiballistic effect include a binder comprising a resole modified with polyvinyl butyral, the binder layer being essentially disposed only between the fabric plies.

The invention is based on a method for controlling the operational sequences in a motor vehicle with an internal combustion engine to which a quantity of fuel and a quantity of air may be fed in order to influence the engine torque. Furthermore, the motor vehicle has an automatic gear system whose transmission ratios can be varied. As a function of the position of an accelerator pedal which can be...

The invention is based on a safety system in a motor vehicle with at least one brake system which is assigned to a wheel unit. Furthermore an automatic gear system which changes its transmission ratios automatically on the basis of specific shift criteria is provided. As a function of a status detection, which is critical for safety, of the brake system associated with the vehicle, a signal which ...

In a device for influencing the engine torque in a motor vehicle during gear-changing in a step-change transmission with an electronic control unit which records the engine speed, the throttle-valve angle and/or the accelerator-pedal angle and the gearbox output speed and/or the vehicle speed, the engine torque is increased in the event of downshifts during the gear change. The engine torque is in...

PCT No. PCT/DE94/01024 Sec. 371 Date Apr. 15, 1996 Sec. 102(e) Date Apr. 15, 1996 PCT Filed Sep. 7, 1994 PCT Pub. No. WO95/07507 PCT Pub. Date Mar. 16, 1995In a method for electronic assembly of a printing form with an assembly station, the imposition of pages into a printing form is undertaken with the assembly station, whereby a form PostScript file is generated that contains all data for output...