Abstract: The present invention relates to a continuous process for the polymerization of olefin(s) utilizing a metallocene catalyst or catalyst system in a continuous slurry or gas phase polymerization process. The invention is more particularly drawn to a gas phase polymerization process for polymerizing one or more olefin(s) in the presence of a metallocene catalyst system in a fluidized bed reactor in the absence of or with a low mount of a scavenger.

Abstract: A high-temperature high-pressure process for producing an ethylene/.alpha.-olefin copolymer is provided in which a saturated hydrocarbon of 4 or less carbons is injected to an unreacted monomer mixture fed to a separator in a high-pressure recycling system. This process enables stable running of the production apparatus for a long term without clogging of the tubing in the high-pressure recycling system.

Abstract: Mixtures of high molecular weight polyisobutylene and thermoplastic polymers are prepared in an extruder by a process in which meterable, high molecular weight polyisobutylene is first metered into the extruder and homogenized in at least one kneading stage, heated and subjected to controlled molecular weight degradation and the thermoplastic polymer is then introduced into the polyisobutylene melt by means of a side feed and is subsequently homogenized together with said melt. The novel process is particularly suitable for the preparation of mixtures of high molecualr weight polyisobutylene and polyethylene.

Abstract: The present invention discloses a starch-based composition suitable for use as a basis for sugar-free confectionery products. The composition of the present invention comprises thinned, hydropropyl tapioca starch, gelatin and a suitable polyol. The components of the composition are present in such amounts that the pH of dental plaque does not fall below 5.7 after consumption of the sugar-free confectionery product containing the indicated components.

Abstract: A modular wall form assembly includes two adjacent form units and a fastening lever. Each of the form units has an upright flat panel, a connecting plate extending rearwardly and inclindedly from the mating edge of the flat panel. Each of the connecting plates has a positioning hole which has a generally oblong cross-section which has two opposed side walls defining its width. The connecting plates contact complementarily one another and the positioning holes are at least partially aligned with one another. The fastening lever has a handle portion and a fastening portion. The fastening portion has a base portion, a neck portion and an enlarged head portion. Each of the neck and head portions has a generally oblong cross-section. The neck portion has two opposed shorter sides in the lengthwise direction.

Abstract: A formwork is to be used with a wall form assembly for forming a door opening in a concrete wall. The formwork mainly includes a parallel pair of mold frame members that are to be disposed between a parallel pair of wall form plates which confine a concrete pouring space for forming a concrete wall, and that are adapted to be mounted to the wall form plates. The mold frame members have partition plates that extend toward and that overlap one another. The partition plates are movable with the mold frame members towards and away from each other and confine a door opening that is isolated from the concrete pouring space. The formwork is easy to assemble and disassemble, is suitable for large-scale construction, and is adjustable to fit the size of the door frame that is to be installed.

Abstract: Tetrafluoroethylene polymer resin is isolated from aqueous dispersion by first freezing the dispersion, followed by thawing the dispersion which enables removal of the water and water soluble impurities from the resin particles.

Abstract: A composite torroid forming cup for an automated torroid-forming apparatus has a molded plastic upper closure and a bottom reinforced cup section. The upper closure has a hinge pin and an upper non-stick partial torroid forming surface. The bottom reinforced cup section has a substantially rigid reinforcing subframe and a plastic outer body portion that may be molded about the subframe. The bottom reinforced cup section has a bottom non-stick, partial torroid-forming surface. A method of making a composite dough torroid forming cup has several steps. A flat reinforcing plate is perforated with a plurality of apertures, and studs are spot-welded in a spaced relation onto the reinforcing plate. The reinforcing plate is positioned on a forming die and is formed thereon. The reinforcing plate is positioned in a mold, and plastic is molded about the reinforcing plate to form a reinforced bottom cup section.

Abstract: Nitrile rubber can be synthesized by copolymerizing acrylonitrile and 1,3-butadiene in an aqueous emulsion. After these monomers have been polymerized, it is, of course, necessary to recover the polymer from the aqueous emulsion.

Abstract: A concrete form having a frame with a first pair of outer frame members and a second pair of outer frame members. The first pair of outer frame members are disposed perpendicular to the second pair of outer frame members so that the first and second pairs of outer frame members define a substantially rectangular shape. The concrete form has two inner frame members connected between two of the outer frame members, the inner frame members being spaced to define a rectangular bay area therebetween. The concrete form has a flat concrete-forming member fixed to the outer frame, and a support member with a pair of end portions and a middle portion disposed between the end portions. The support member is connected to the first and second inner frame members so that the middle portion of the support member is spaced from the concrete-forming member by a first distance and so that the end portions of the support member are spaced from the concrete-forming member by a second distance smaller than the first distance.

Abstract: An improved gas-phase polymerization process for producing in-situ thermoplastic polyolefins in multiple reactors using high activity Ti/Al catalysts is provided. The improvement consists of developing a control parameter derived from eight integrated regions of the copolymer .sup.13 C NMR spectrum, defining the limits of the control parameter for the process, and operating the process to maintain the parameter within the defined limits. This is accomplished by adjusting the amount of ethylene fed to the secondary reactor and adjusting other process variables as required. Thermoplastic polyolefins, i.e., modified polypropylenes, having reduced hexane extractables and improved paint adhesion are also disclosed.

Abstract: A new and unique method of forming and pouring concrete walls is described wherein concrete walls are constructed with unprecedented speed, precision, and flexibility. This is accomplished through the use of preformed corner or angle units working in conjunction with unique forming panels. With the speed of assembly of the forming units a "form and pour as you go" method is utilized which allows the entire structure to be finished in one monolithic pouring of concrete. The method is adaptable to the construction of large or small structures. The method may be used for homes, commercial buildings, public buildings, and for other shelters. The walls so produced may be intrinsically insulated at the time of construction. Cost savings are considerable through the reduction of the amount of labor required and through the use of ordinary building materials that are readily available. The unique more expensive forming equipment can be reused many times and the cost per use would be negligible.

Abstract: The disclosed invention provides novel golf ball compositions which contain olefinic based ionomers and non-ionic olefinic copolymers produced by use of metallocene catalysts. These compositions exhibit improved mechanical properties such as tensile and flexural properties. Golf balls which employ these blends provide ball properties and performance similar to and in some cases better than the state of the art ionomer based golf balls.

Abstract: Disclosed is a method for removing oligomers from substantially crystalline, .alpha.-olefin polymer particles without having to melt the particles. The method comprises fluidizing a bed of the particles with a gas in which the oligomers are soluble, which bed is at a temperature at which the particles are not sticky, but at least lower molecular weight oligomers will evaporate therefrom, and maintaining the particles in the fluidized bed until a substantial portion of the oligomers have evaporated and have been removed from the bed by the fluidizing gas. By regulatng the bed temperature and the residence time of the particles in the bed the proportion and chain length of the oligomers removed can be controlled.

Abstract: An injection molding machine for processing plastifiable materials includes a positioning element, a stationary mold carrier fixedly connected therewith, a movable mold carrier defining a mold tentering space with the stationary mold carrier, a closing device for shifting the movable mold carrier in a closing direction into a closed position with the stationary mold carrier, a supporting element for the closing device movably carried by the positioning element, and a clamping unit jointed to the stationary mold carrier and the supporting element at coupling points and adapted to essentially take up occurring forces and deformations and to deviate them around said mold tentering space. The clamping unit is formed of several pieces jointed to the stationary mold carrier or the supporting element at the coupling points and are coupled with each other at at least one first connecting point spaced from the coupling points.

Abstract: A backplate assembly for supporting the molds of blowmolding machines having plural molds wherein the backplate assembly consists of two planar plates having a resilient elastic compressible cushion disposed therebetween to permit limited self-adjustment of the plates as determined by pressure produced upon the mold halves closing. The cushion is formed by an elongated spirally configured elastic resilient strand located within recesses formed in the plates, and the configuration of the strand may be related to the distribution of compressive forces imposed on the backplate assembly.

Abstract: Process for gas-phase polymerization carried out in two interconnected polymerization zones, to which one or more .alpha.-olefins CH.sub.2 .dbd.CHR are fed in the presence of catalyst under reaction conditions and from which the polymer product is discharged. The process is characterized in that the growing polymer flows through a first polymerization zone under fast fluidization conditions, leaves said first zone and enters a second polymerization zone through which it flows in a densified form under the action of gravity, leaves said second zone and is reintroduced into the first polymerization zone, thus establishing a circulation of polymer around the two polymerization zones. The novel process allows olefins to be polymerized in the gas phase with high productivity per unit volume of the reactor without incurring the problems of the fluidized-bed technologies of the known state of the art.

Abstract: A process for finishing latex to form a dry resin and the resulting product. The process includes coagulating a latex of a thermoplastic polymer at a temperature at or just above the agglomeration temperature of the resin, dewatering the resin slurry to form a resin cake, drying the resin cake using extrusion technology to form a resin melt and solidifying the resin melt to form the resin. Preferred processes of the invention also include finishing the resin, such as by pelletizing and/or grinding it. More preferred processes of the invention include collecting and neutralizing the aqueous liquid byproducts from the dewatering and drying steps of the process. One embodiment of the invention includes utilizing water to solidify the resin melt, pelletizing the resin and drying the pellets.

Abstract: A gas phase process for producing olefin polymer graft copolymers, including providing a reaction apparatus having first and second reaction zones operatively connected to each other into which particles of an olefin polymer and a free-radical polymerizable monomer are fed while maintaining free-radical polymerization conditions and a substantial non-oxidizing environment in said zones and from which the grafted copolymer product is discharged. An apparatus suitable for practicing this process is also disclosed.

Abstract: For gas phase polymerization reactions in the presence of an unsupported polymerization catalyst, there is provided a process for introducing a liquid catalyst so as to provide a resin particle lean zone such that the average particle size of the resin produced ranges from about 0.01 to about 0.06 inches.