Process for Producing Polymer

Assignee Denki Kagaku Kogyo Kabushiki Kaisha (Tokyo, JP) 

Under an argon stream, 50 ml of a diethyl ether solution of lH-(2-methyl-cyclopenta [ 1 ] -phenanthrene) (21.7 mmol) was cooled to 0°C and then treated with n-butyllithium in hexane solution (21.7 mmol) and stirred at ambient temperamre for 3 hours. This solution was added dropwise to 50 ml of a diethyl ether solution of dichlorophenyl 

Preparation of rac-Phenylboranediylbis l-(2-Methyl-Cyclopenta[l] Pbenantbryl) -Zirconium Dicbloride 

In an argon atmosphere 40 ml of toluene containing the Step 1 product (5.65 mmol) was added to a 40 ml of the toluene solution containing tetrakis(dimethylamino) zirconium (5.77 mmol) and then refluxed for 4 hours. The mixture was concentrated and treated with 80 ml of toluene containing trimethylsilyl chloride (92.3 mmol) and stirred overnight. The mixture was re-concentrated, and the residue was washed with pentane and extracted with CH2CI2. The extract was then concentrated, and precipitated crystals were collected by fdtration. Crystals were washed with diethyl ether and dried under reduced pressure at from 70°C to 120°C. The crystals were re-extracted with methylene chloride, the solution concentrated, and 0.2 g of a clear yellow solid product was isolated. 

A10-liter reactor was charged with 4.8 liter of toluene, heated to 70°C, and treated with triisobutylaluminum (8.4 mmol). The temperature was then increased to 90°C, and ethylene was introduced. After the pressure was stabilized at 1.1 MPa, 50 ml of a toluene solution containing the Step 2 product (0.3 mmol) and triisobutylaluminum (0.84 mmol) were added. The polymerization duration was 5 minutes. Thereafter the reaction was quenched with methanol, and 215 g of product were isolated. 

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Figure 9-3. A flow diagram showing the metathesis process for producing polymer grade propylene from ethylene and 2-butene.

However, some semiaromatic nylons can give problems as a result of the high melt viscosity. A process for producing polymers of hexamethylenediamine, adipic acid, terephthalic acid, and isophthalic acid has been developed, which involves vaporizing the salt mixture in a high temperature dash reactor followed by molecular weight increase in a twin-screw extruder with efficient moisture removal (17). 

Mention has already been made in this chapter of metallocene-catalysed polyethylene (see also Chapter 2). Such metallocene catalysts are transition metal compounds, usually zirconium or titanium. Incorporated into a cyclopentadiene-based structure. During the late 1990s several systems were developed where the new catalysts could be employed in existing polymerisation processes for producing LLDPE-type polymers. These include high pressure autoclave and... 

The diagram shows the main steps in a process for producing a polymer. From the following data, calculate the stream flows for a production rate of 10,000 kg/h. 

Improved compositions useful for the production of foamed rotomoulded articles are provided. The compositions of the invention are comprised of a first thermoplastic resin component which is an ethylene polymer in pellet form containing a foaming agent and a second thermoplastic resin component which is a powder consisting of a mixture of different particle size and melt index ethylene polymers. An improved process for producing foamed rotomoulded articles having uniformly foamed interiors and smooth exterior skins which are snbstantially free of surface defects is also provided. 

Patent Number US 5817705 A 19981006 SHORT TIME FRAME PROCESS FOR PRODUCING EXTRUDED CLOSED CELL LOW DENSITY PROPYLENE POLYMER FOAMS... 

Film thickness can govern the morphology, stability, and surface-chemical expression of polymeric thin films. NIST researchers developed a process for producing gradients, termed flow coating, which is a modified blade-casting technique [3-5]. How coater instrumentation and the flow coating process are illustrated in Fig. 2. To create the library, a dilute solution of polymer in solvent (1-5% mass fraction) is injected into the gap between a doctor blade positioned over a flat substrate... 

Title Monomer Compound, Process for Producing the Same, Polymer Thereof, and Water-Based Curable Composition... 

Title Process for Producing Polysilsesquioxane Graft Polymer, Pressure-Sensitive Adhesive, and Pressure-Sensitive Adhesive Sheet... 

N. Oshima, M. Kaizu, S. Ebata, and T. Imamura, Process for producing cycloolefin addition polymer, US Patent 7268196, assigned to JSR Corporation (Tokyo, JP), September 11, 2007. 

S. Kobayashi, T. Mizoe, Y. Iwanami, O. Otsu, S. Yokoyama, K. Kurihara, and H. Yazawa, Split polyethylene stretched material and process for producing the same, US Patent 5578373, assigned to Nippon Oil Co., Ltd. (Tokyo, JP) Nippon Petrochemicals Co., Ltd. (Tokyo, JP) Polymer Processing Research Institute Ltd. (Tokyo, JP), November 26,1996. 

Particle Size and Shape. The polymerization process for producing macroporous synthetic polymers (539) leads to the formation of spherical particles whose size can be controlled within certain limits. The popular XAD polymers are usually sold with approximately 90 of the total weight encompassing smooth beads with 20-50-mesh sizes. Most users incorporate a suspension step to remove the fines in their purification of the polymer, but they do not remove the small number of particles larger than 20 mesh. The particle size and distribution vary with different polymer batches, and it is advisable to mechanically sieve polymer beads and choose only those within the 20-50-mesh size for preparation of the adsorption columns. 

In bulk polymerization, no solvents are employed and the monomer acts as the solvent and continuous phase in which the process is carried out. Commercial bulk processes for acrylic polymers are used mainly m the production of sheets, rods and tubes. Rulk processes are also used on a much smaller scale in the preparation of dentures and novelty items and in the preservation of biological specimens. Acrylic castings are produced by pouring monomers or partially polymerized sirups into suitably designed molds and completing the polymerization. Acrylic bulk... 

There are several techniques for producing polymer mixtures for further processing into articles by the reactive (chemical) molding methods simultaneous formation of two polymeric systems with mutual entanglement of their chains and the appearance of so-called interpenetrating networks synthesis of the second polymer within an expanded network of the initial polymer incorporation of oligomers into a polymer matrix as a temporary plasticizer followed by polymerization. 

Dense star polymers and a process for producing dense star polymers. [D. A. Toma-lia, J. R. Dewald, PCTInt. Appl. 8402705 1984] [ 589]. 

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