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| Number | Title | Issue Date |
| 5015714 | Heptadiene polymer and process for producing the same A heptadiene polymer comprising the repeating units ##STR1## and having a number-average molecular weight of 2,000-500,000.... | 05/14/1991 |
| 4988781 | Process for producing homogeneous modified copolymers of ethylene/alpha-olefin carboxylic acids or esters A homogeneous, random interpolymer of ethylene and an alpha-olefinically unsaturated carboxylic acid or ester having a melt flow rate in the range of about 0.1 to about 300 g/10 minutes, as determined by ASTM D-1238 (190° C./2160 g), is improved during i... | 01/29/1991 |
| 4987200 | Preparation of polymer incorporating masked functional group-containing monomers Polymers of olefin monomers and a substantially uniform concentration of carboxyl, hydroxyl, thio, amino, cabonyl and imino functional group-containing monomers. Polymers of olefin monomers and carboxyl, hydroxyl, thio, amino, carbonyl and imino functiona... | 01/22/1991 |
| 4977226 | Process for production of molded article of norbornene polymer Process for production of a molded article comprising polymerizing a norbornene monomer having bicyclic or higher cyclic structure in the presence of a metathesis catalyst system and a viscosity modifier having room temperature viscosity of 300 to 50,000 ... | 12/11/1990 |
| 4975492 | Butene-1 copolymer composition The present invention relates to a butene-1 copolymer composition which has excellent heat sealing properties, mechanical characteristics, moldability, and transparency without lowering its surface characteristics, and is characterized by containing 75 to... | 12/04/1990 |
| 4972035 | Process for preparing ultra-high-molecular-weight polyolefin fine powder Ultra-high-molecular-weight polyolefin fine powder characterized in that said fine powder has an intrinsic viscosity measured in decalin at 135° C. of at least 10 dl/g and an average particle diameter in the range of 1-80 μm, at least 20 weight % of the... | 11/20/1990 |
| 4972032 | Process for preparing copolymers of alpha-methylstyrene and acrylonitrile Copolymers of -methylstyrene and acrylonitrile having improved composition of uniformity are prepared by emulsion polymerizing a first monomer stream having a weight ratio of -methylstyrene/acrylonitrile from about 75/25 to about 85/15 and ... | 11/20/1990 |
| 4970278 | Method of preventing polymer scale deposition Polymer scale deposition on polymerization reactor inside surfaces in the polymerization of a monomer or monomers having an ethylenic double bond and/or a monomer or monomers having diolefinic double bonds is prevented, peelability or removability of poly... | 11/13/1990 |
| 4970279 | Process for polymerizing one or more 1-olefins in the gas phase in the presence of pulverulent inorganic material A process for (co)polymerizing alpha-olefins in the gas phase in a fluidized bed or mechanically stirred bed reactor using a Ziegler-Natta type catalyst or a heat activated chromium oxide/refractory oxide catalyst wherein the (co)polymerization is carried... | 11/13/1990 |
| 4968765 | Molecularly oriented molded body of ultra-high-molecular-weight ethylene/polyene copolymer Disclosed is a molecularly oriented molded body of an ultra-high-molecular-weight ethylene/polyene copolymer having an intrinsic viscosity (η) of at least 5 dl/g and such a content of a polyene that the number of molecules of the polyene is 0.01 to 15 on... | 11/06/1990 |
| 4968764 | Rubber compounding material and composition A rubber compounding material incorporating a cyclopentadiene-based pertroleum resin prepared by thermally copolymerizing 100 parts by weight of a cyclopentadiene-based feed or dicyclopentadiene-based feed with about 5 to 100 parts by weight of an ... | 11/06/1990 |
| 4966951 | High strength linear, low density polyethylene polymerization process A copolymer of ethylene and a higher alpha-olefin, preferably 1-hexene and/or 4-methyl-1-pentene, can be produced using an activated and subsequently carbon monoxide reduced chromium containing catalyst and a trialkyl boran cocatalyst. The polymerization ... | 10/30/1990 |
| 4966952 | Thermoplastic polymer composition comprising trans 1,4-polyisoprene A novel process for providing a thermoplastic polymer having novel thermal characteristics including the critical step of masticating the polymer, either continuously or discontinuously, until the melt index of the polymer is substantially increased.... | 10/30/1990 |
| 4965326 | Process for deactivating polymerization-inducing radicals Process for inhibiting and for stopping radical induced polymerizations which employs an aromatic hydroxy dithiocarboxylic acid or salt thereof as stopping agent for deactivating radicals, thereby precluding the formation of carcinogenic nitrosamines.... | 10/23/1990 |
| 4965327 | Synthesis of polydiene rubber by high solids solution polymerization Synthetic elastomers are typically made commercially by employing emulsion polymerization or solution polymerization techniques. In such solution polymerization techniques, it is desirable to operate at the highest solids content which is practical. As a ... | 10/23/1990 |
| 4965298 | Preparation and cooling of aqueous polymer solution A process for preparing aqueous polymer solutions wherein a section of a fluid conduit through which a stream of liquid polymer product flows contains spaced static mixers. Heated water from a heat exchanger surrounding the section of conduit containing t... | 10/23/1990 |
| 4962185 | Process of rendering copolymer powders of maleic anhydride and an alkyl vinyl ether prepared in benzene solvent substantially benzene-free Substantially benzene-free copolymers of maleic anhydride and alkyl vinyl ethers having benzene present in an amount of less than 1 ppm and toluene present in an amount of about 2.0 wt. % or less are provided by treating the copolymer powder with toluene ... | 10/09/1990 |
| 4960842 | Amine containing initiator system for anionic polymerization Narrow molecular weight telechelic and/or block copolymers are prepared by anionic polymerization using an initiator composition comprising a multifunctional lithium initiator in combination with an organic diamine or triamine and optionally a metal alkox... | 10/02/1990 |
| 4960864 | Process for recovering thermoplastic polymers from dispersion Recovery of thermoplastic polymer solids from dispersions thereof by coagulation and subsequent washing of the solids is improved by contacting the polymer in the coagulation stage or the washing stage or in both stages with at least one tricarboxylic aci... | 10/02/1990 |
| 4959435 | Oriented optically transparent crystalline syndiotatic vinylaromatic polymer Oriented, syndiotactic, optically transparent vinylaromatic polymers are prepared by a process comprising heating the polymer to a temperature above its crystalline melting point, cooling the polymer to a temperature less than an orientable temperature at... | 09/25/1990 |
| 4958006 | Fluidized bed product discharge process Method and apparatus for the post reaction treatment of resins produced by fluidized bed polymerization of alpha olefins wherein an extruder is coupled in communication with the reactor and all necessary devolatilization of monomer, deactivation of cataly... | 09/18/1990 |
| 4957982 | Process for reducing reactor fouling during polymerization in an aqueous medium To reduce fouling on reactor surfaces, the surfaces are coated with a protective film of polymeric material of surface energy of less than 15 dynes/cm. The preferred coating materials are polymers of one or more monomer chosen from the 2-(N-alkylperfluoro... | 09/18/1990 |
| 4956427 | Process for reducing polymer build-up in polymerization equipment during polymerization of alpha-olefins A method for the prevention of fouling of metallic surfaces exposed to reactive alpha-olefin gases during the production of polymeric resins which comprise coating such metallic surfaces with an amino silicone fluid and thereafter curing said coating by h... | 09/11/1990 |
| 4954615 | Process for drying carboxyl containing polymers of vinylidene monomers A slurry mixture comprising a carboxyl containing polymer of vinylidene monomers having at least one terminal methylene group and a polymerizing solvent is effectively dried by way of: passing said mixture through one or a plurality of preheated double pi... | 09/04/1990 |
| 4952625 | Process for improving the flowability of ultrahigh-molecular-weight polyethylene composition A process for producing a thermoplastic ultrahigh-molecular-weight polyethylene composition having excellent moldability, which comprises mixing at room temperature to 100° C. an ultrahigh-molecular-weight polyethylene having an average molecular weight ... | 08/28/1990 |
| 4952453 | Acrylic fibers with high physical properties Acrylic fibers with high physical properties particularly suitable as material for cement reinforcement are provided by spinning a spinning solution of an acrylonitrile polymer at a particular linear velocity ratio of extrusion, thereby forming gel fibers... | 08/28/1990 |
| 4952672 | Method for the devolatilization of thermoplastic materials This invention is a method and an apparatus for rapidly devolatilizing a product of a polymerization process containing at least one volatile material. The product is initially devolatilized in a high temperature zone, and the foamed devolatilized product... | 08/28/1990 |
| 4950724 | Suspension polymerization of vinyl aromatic monomers to polymer having high syndiotacticity Vinyl aromatic polymers having stereo regular structure of high syndiotacticity are prepared utilizing coordination catalysts in a suspension polymerization process.... | 08/21/1990 |
| 4950723 | Organic acid halide neutrallizing agents for anionic polymerizations A process for neutralizing the terminated remnant of an alkali metal anionic polymerization initiator comprising contacting the remnant with an organic acid halide.... | 08/21/1990 |
| 4948847 | Production of styrene resins by continuous bulk polymerization A process for producing a styrene resin by continuous bulk polymerization using a polymerization apparatus comprising a circulating line (I) for initial-stage polymerization including at least one tubular reactor having fixedly set therein a plurality of ... | 08/14/1990 |
| 4948856 | Homogeneous addition copolymers of ethylene and cycloolefin monomers and method for producing same The present invention provides a method for producing addition copolymers of ethylene and cycloolefin monomers of the norbornene-type, such as norbornene and tetracyclododecene. Copolymers having a uniform structure with uniform glass transition temperatu... | 08/14/1990 |
| 4946891 | Semi-continuous emulsion polymerization process A method of carrying out a continuous aqueous emulsion copolymerization using a single continuously stirred tank reactor to reduce the particle size distribution and the presence of over-sized particles comprises, slowly supplying to a reactor the materia... | 08/07/1990 |
| 4943616 | Living cationic polymerization process A polymerization process is provided for producing a terminally functional polymer which comprises introducing a monomer charge, a Lewis acid and an organic peroxy compound into a suitable reaction vessel and polymerizing the monomer charge at a temperatu... | 07/24/1990 |
| 4943621 | Storage stable components of reactive formulations for bulk polymerization of cycloolefin monomers Methods of preparing storage stable components useful for metathesis bulk polymerization of cycloolefin monomers are provided. These components contain cycloolefins with norbornene-functional groups and cocatalysts activated with a halometal compound. In ... | 07/24/1990 |
| 4942210 | Branched isoolefin polymer prepared with adamantane catalyst system Isobutylene homopolymers and copolymers are prepared using a catalyst system comprising a haloadamantane component and a Lewis acid. Branched polymers are prepared using polyhaloadamantanes, the branches being attached to the adamantane at the former loca... | 07/17/1990 |
| 4940760 | Group Transfer Polymerization process employing supported initiators Group Transfer Polymerization (GTP) process for preparing a "living" polymer, the process comprising contacting under polymerizing conditions in a polymerization medium, at least one acrylic or maleimide monomer with an initiator which is a tetracoordinat... | 07/10/1990 |
| 4937298 | Process for producing styrene/(meth)acrylic acid copolymer A process for producing a styrene/(meth)acrylic acid copolymer continuously by a bulk or solution polymerization technique, wherein the polymerization is carried out continuously by using at least two polymerization vessels arranged in series and equipped... | 06/26/1990 |
| 4935475 | Process for producing cycloolefin random copolymer A process for producing a cycloolefin random copolymer, which comprises (1) copolymerizing (a) ethylene or both ethylene and an alpha-olefin having at least 3 carbon atoms with (b) a cycloolefin such as octahydronaphthalenes and bicyclo[2,2,1]hept-2-ene in the... | 06/19/1990 |
| 4935469 | Process for producing monodispersed vinyl polymer fine particles A process for producing monodispersed fine particles of a vinyl polymer is disclosed, which comprises polymerizing monomers containing at least one vinyl monomer selected from the group consisting of aromatic vinyl compounds, acrylic esters, and a methacr... | 06/19/1990 |
| 4933402 | Phosphorus compounds that delay the metathesis polymerization of cycloolefins Disclosed is a method of delaying the metathesis polymerization of strained ring cycloolefins by addition of certain phosphorus-containing compounds including various aryl phosphates, aliphatic phosphates, aliphatic phosphites, aryl phosphites, aryl phosp... | 06/12/1990 |
