|
Match
|
Document |
Document Title |
|
|
7629422 |
Process for transitioning between Ziegler-Natta-based and chromium-based catalysts
Embodiments of our invention relate to processes for transitioning among polymerization catalyst systems including processes for transitioning among olefin polymerization reactions using...
|
|
|
7482410 |
Processes for producing high density polyethylene
Processes for reducing the ultra high molecular weight polymeric material content of a high density polyethylene produced with a bis-triarylsilyl chromate catalyst system are provided. Processes...
|
|
|
7459507 |
Method for the termination of anionic polymerization using phosphate ester/water mixture
The present invention relates to a method for terminating anionic polymerization using phosphate ester/water mixture, more particularly to a novel method for terminating anionic polymerization...
|
|
|
7446167 |
Catalyst deactivation agents and methods for use of same
A method of deactivating a polymerization catalyst system comprising contacting the catalyst system with a catalyst deactivation agent wherein the catalyst system comprises an alkyl aluminum...
|
|
|
7399810 |
Polymerization of monomers with differing reactivities
There is provided a process for producing a polymer comprising the steps of
(a) adding at least one low-reactivity monomer to a reaction vessel with a decreasing rate of addition, (b) adding...
|
|
|
7381777 |
Method for controlling fouling in slurry-type polymerization reactors
The present invention relates to methods for controlling fouling in the reaction zone of slurry-type olefin polymerization reactors by measuring a process operating parameter and by responding to...
|
|
|
7265191 |
Multi-functional admixtures for hydraulic cement compositions
A multi-functional admixture for simultaneously providing specified characteristics to hydraulic cement compositions such as concrete contains one or more of specified reaction mixtures obtained by...
|
|
|
7193012 |
Dispersing agent comprising vinyl alcohol polymer having conjugated double bonds in its molecule
A dispersing agent suitable for suspension polymerization of vinyl compounds, comprising a polyvinyl alcohol resin containing carbonyl groups in its molecule and having a block character of...
|
|
|
7179870 |
Method for the preparation of poly sg(a)-methylstyrene
The invention relates to a process for the preparation of poly(α-methylstyrene) by anionic polymerization of the α-methylstyrene monomer, said process successively comprising the following...
|
|
|
7179875 |
Method for producing water-absorbent resins
In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene...
|
|
|
7169867 |
Catalyst for bulk polymerization
A catalyst for bulk polymerization of a polymerizable unsaturated compound of the invention comprises a compound having at least one thiol group and a secondary hydroxyl group and represented by...
|
|
|
7045582 |
Preparation process of copolymer for semiconductor lithography and a copolymer for semiconductor lithography available by this process
Provided are a preparation process of a copolymer for semiconductor lithography, suited for a film forming composition used for the formation of minute patterns necessary for semiconductor...
|
|
|
7005485 |
Process for producing polyolefins
A process is provided that produces polyolefins. The process comprises mixing a first stream, which comprises at least one catalyst deactivating agent, with a second stream, which comprises at...
|
|
|
6998449 |
Latent metallocene catalyst systems for olefin polymerization
A metallocene catalyst may be temporarily and reversibly passivated by contact with an effective amount of a passivating compound selected from the group of oxygen, oxygen-containing compounds, and...
|
|
|
6995217 |
Processes for transitioning between metallocene and Ziegler-Natta polymerization catalysts
Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning from...
|
|
|
6984706 |
Diene rubber, process for production thereof, rubber compositions, process for producing the same, and crosslinked rubbers
A diene rubber (A) having a weight average molecular weight (Mw) of 100,000 to 3,000,000, an Mw/number average molecular weight (Mn) ratio of 1.30 to 2.50, and an Mw/peak top molecular weight (Mp)...
|
|
|
6967230 |
Process for producing polyolefins
A process is provided that produces polyolefins.
|
|
|
6956093 |
Preparation of syndiotactic polybutadiene, rubber composition and tire with rubber component
The present invention relates to the preparation of syndiotactic 1,2-polybutadiene polymer using a catalyst containing a carbon disulfide in which the polymerizate thereof is treated with hydrogen...
|
|
|
6936666 |
Continuous gas-phase polymerization process
Continuous gas-phase polymerization process for preparing ethylene and propene homopolymers and copolymers, in which ethylene, propene or mixtures comprising ethylene or propene and C 3 -C 8...
|
|
|
6916885 |
Method for breaking a chain during anionic polymerisation
A process for the preparation of linear polymers or block copolymers of styrene by anionic polymerization comprises carrying out the chain termination with an n-alkyl glycidyl ether or a dialkyl...
|
|
|
6906129 |
Polymer scale preventive agent
A polymer scale preventive agent for use in the polymerization of a monomer containing an ethylenic double bond is provided. The agent includes (A) a condensation reaction product obtained by...
|
|
|
6897269 |
Processes for transitioning between Ziegler-Natta and alumoxane-based single-site polymerization catalysts
Processes for transitioning among polymerization catalyst systems, preferably catalyst systems that are incompatible with each other. In particular, the processes relate to transitioning among...
|
|
|
6867270 |
Process for transitioning between incompatible catalysts using a substantially contaminant free seedbed
The present invention is a process for transitioning from a first polymerization reaction to a second polymerization reaction incompatible with the first polymerization reaction in a gas-phase...
|
|
|
6841630 |
Processes for transitioning between chrome-based and mixed polymerization catalysts
Processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, processes for transitioning among olefin...
|
|
|
6833417 |
Processes for transitioning between chrome-based and mixed polymerization catalysts
A process of transitioning from a first polymerization reaction conducted in the presence of a mixed catalyst system to a second polymerization reaction conducted in the presence of a chrome-based...
|
|
|
6806331 |
Process for bulk polymerization using a catalyst
A catalyst for bulk polymerization of a polymerizable unsaturated compound comprises a compound having at least one thiol group and a secondary hydroxyl group and represented by the following...
|
|
|
6784262 |
Processes for chemically-modifying the surface of emulsion polymer particles
Processes for chemically-modifying the surface of an emulsion polymer particle are provided which include providing an aqueous emulsion polymer, a monomer at a level of at least 0.5% by weight...
|
|
|
6767960 |
Process for preparing high impact vinyl aromatic polymer by continuous anion polymerization method
The present invention is to provide a continuous anion polymerization method for preparing transparent high impact vinyl aromatic polymer comprising the steps of: i) charging and polymerizing vinyl...
|
|
|
6716945 |
Multimodal fluoropolymers and methods of making the same
A method for forming a fluoropolymer comprises providing a reaction mixture comprising carbon dioxide, at least one fluoromonomer, and an initiator; and reacting the at least one fluoromonomer in...
|
|
|
6710140 |
Method for producing polyisobutenes
A process for the preparation of polyisobutylenes by cationic polymerization of isobutylene or isobutylene-containing hydrocarbon streams in the liquid phase in the presence of boron trifluoride...
|
|
|
6710146 |
Composition and process for controlled radical polymerization using multifunctional initiator/regulator compounds
The present invention relates to a polymerizable composition comprising a) at least one ethylenically unsaturated monomer and b1) at least one multifunctional triazinyl based 2,2,6,6...
|
|
|
6689846 |
Process of producing α-olefin polymers
The present invention relates to a process for polymerizing α-olefins in at least two stages, the first stage comprising at least one bulk reactor and optionally at least one gas phase reactor for...
|
|
|
6677409 |
Method of producing vinyl-based polymer
A method of producing a vinyl-based polymer is provided in which the blocking of piping resulting from solidification of a reaction inhibitor does not occur even if the operation of supplying the...
|
|
|
6673880 |
Bridged zirconocene compounds, process for their preparation and their use as catalyst components in the polymerization of olefins
Zirconocene compounds with two indenyl ligands linked in the 2 position by means of a two-carbon-atoms divalent bridging group can be suitably used as components of catalysts for the polymerization...
|
|
|
6673879 |
Use of diamines and alkanolamines to inhibit unsaturated monomer polymerization
It has been discovered that the polymerization of unsaturated compounds, such as butadiene, may be inhibited by the addition of a diene and/or alkanolamine inhibitor. The inhibitor is believed to...
|
|
|
6646044 |
Continuous production method of propylene-based block copolymer
A stable continuous production of a propylene-based block copolymer can proceed for a long time without causing accumulation of particles having a small diameter by a process having the following...
|
|
|
6642337 |
Stabilized cyanoacrylate adhesives
The problem addressed by the invention was to find an anionic polymerization inhibitor for cyanoacrylate adhesives containing one or more cyanoacrylates, stabilizers against anionic and radical...
|
|
|
6639026 |
Methods and compositions for inhibiting polymerization of vinyl monomers
Methods and compositions for inhibiting the polymerization of vinyl monomers are disclosed. Combinations of aminophenol compounds and nitroxyl radical compounds are effective at inhibiting vinyl...
|
|
|
6639027 |
Production process for vinyl-based polymer
A production process for a vinyl-based polymer is provided. The production process comprises a step for polymerizing a vinyl-based monomer by a radical reaction within an aqueous medium in a...
|
|
|
6627717 |
Organic solution of dialkyl peroxydicarbonate, process for producing it, preparation of halogenated polymers with the involvement of this solution and halogenated polymers obtained
The invention relates to a process for the preparation of an organic solution of dialkyl peroxydicarbonate which is particularly suited for use in the aqueous suspension polymerization of...
|
|
|
6596824 |
Method for producing polyolefin and gas phase polymerization apparatus
Provided is a continuous vapor-phase polymerization method for producing polyolefins. In the method, polymer agglomerates and aggregates are prevented from being formed, and polymer deposition on...
|
|
|
6593429 |
Polymer having combined linear and nonlinear structure and its preparing method
A combined linear and nonlinear polymer (i.e., having a combined linear, branched and radial structure) P+PnD according to the present invention is represented by (P+PnD) −+ Li, where P is a...
|
|
|
6562915 |
Method for carrying out radical ethylene high-pressure polymerization while preventing undesired polymer deposits
In a process for the polymerization or copolymerization of ethylenically unsaturated monomers in the presence of polymerization initiators which decompose to form free radicals in a continuously...
|
|
|
6541579 |
Free radical inhibitors for quenching aqueous phase polymer growth and related methods
An aqueous phase inhibitor for quenching free radical polymerization comprising a free radical quenching agent having a hydrophilic tail is disclosed, as well as a coating and related methods. In...
|
|
|
6518374 |
Method of immediately terminating free-radical polymerisation processes
Free radical polymerizations immediately terminated by a process comprising the addition of an inhibitor solution which contains phenothiazine and at least 50% (w/w) N-alkylpyrrolidone to a system...
|
|
|
6495065 |
Nitrosamine-inhibiting compositions for shortstopping of free radical emulsion polymerizations
The present invention is a composition for and a method of shortstopping free radical emulsion polymerizations that inhibits the formation of nitrosamines. The composition comprised nitrosamine...
|
|
|
6437043 |
Process and apparatus for continuous manufacture of elastomer-modified monovinylaromatic compounds
The present invention discloses processes and apparatus for the efficient and rapid conversion of an elastomeric monomer to a polymerized elastomer, and conjointly, reaction of the resultant...
|
|
|
6403703 |
Polymeric compositions from acrylic and unsaturated carboxyl monomers
An aqueous composition suitable for use, when dry, as an improved elastomeric coating, caulk, sealant, or pressure sensitive adhesive is provided including a predominantly acrylic aqueous emulsion...
|
|
|
6399721 |
Process for synthesizing styrene-butadiene rubber
Conventional SBR does not have the soft and smooth chew characteristics needed in chewing gum base for soft chew applications. Conventional SBR typically also has undesirable odor and taste...
|
|
|
6388027 |
Transition strategy for the production of sticky polymers
The invention relates to a process for transitioning from polymerizing sticky polymer to polymerize another sticky polymer in gas phase fluidization bed production to decrease transition time,...
|