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7300993 |
Process for the preparation of polyether polyols
The invention relates to a process for the preparation of polyether polyols, which process involves:
(a) contacting a phosphorus containing compound having at least one hydroxyl group with...
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7196142 |
Polyisobutylene-based block anionomers and cationomers and synthesis thereof
Various novel block cationomers comprising polyisobutylene (PIB) and poly(2-dimethylamino)ethyl methacrylate) (PDMAEMA) segments have been synthesized and characterized. The specific targets were...
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7108958 |
Photosensitive bottom anti-reflective coatings
Anti-reflective compositions and methods of using these compositions to form circuits are provided. The compositions comprise a polymer dissolved or dispersed in a solvent system. Preferred...
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7102047 |
High metathesis activity ruthenium and osmium metal carbene complexes
Ruthenium and osmium carbene compounds that are stable in the presence of a variety of functional groups and can be used to catalyze olefin metathesis reactions on unstrained cyclic and acyclic...
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6888018 |
ORGANOMETALLIC COMPOUND HAVING HIGH METATHESIS ACTIVITY AND METHOD FOR PREPARATION THEREOF, METHATHESIS REACTION CATALYST COMPRISING THE COMPOUND, METHOD OF POLYMERIZATION USING THE CATALYST, AND POLYMER PRODUCED BY THE METHOD OF POLYMERIZATION
The present invention provides an organometallic compound represented by the general formula (1) or (2), process for producing the same, metathesis reaction catalyst containing the same,...
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6887956 |
Catalyst system for high-cis polybutadiene
A catalyst system suitable for use in the production of high cis polybutadiene is disclosed. The catalyst system includes a cobalt salt of the formula
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6753390 |
Gas phase polymerization process
A gas phase polymerization process for producing a polyolefin composition is described, which includes passing a gaseous stream containing hydrogen gas and one or more monomers, including ethylene...
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6716929 |
Superabsorbent polymers having a slow rate of absorption
Superabsorbent polymers having a slow rate of absorption, and a process for their preparation. The superabsorbent polymer has a slow rate of absorption, is crosslinked with a covalent crosslinking...
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6610802 |
Process for synthesis of polymer compositions, polymer compositionS obtainable by the process, and use of the same
The present invention relates to a process for synthesis of polymer compositions with reduced catalyst content, wherein ethylenically unsaturated monomers containing less than 0.5 wt % of...
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6559252 |
Catalysts and processes for the polymerization of olefins
Catalysts for the polymerization of olefins are disclosed, which comprise the product obtained by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of titanium, zirconium or...
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6486279 |
Acid activation of ruthenium metathesis catalysts and living ROMP metathesis polymerization in water
Activation of ruthenium based catalyst compounds with acid to improve reaction rates and yields of olefin metathesis reactions, including ROMP, RCM, ADMET and cross-methasis reactions is disclosed....
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6476163 |
Catalysts for the polymerization of olefins and process for the preparation thereof
Catalysts for the polymerization of olefins are disclosed, comprising the product obtainable by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of Ti, Zr or Hf; (B) one or...
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6455645 |
Process for the production of telechelic polymers, telechelic polymers produced in this manner and use thereof
A novel process for the production of oligomeric and polymeric telechelic compositions, to the telechelic compositions produced in this manner and to use thereof in the plastics, fibres or lacquer...
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6395846 |
Catalysts for olefin polymer production
The invention relates to high-activity catalysts for olefin polymerization, to efficient methods for producing them, and to efficient methods of using the catalysts for producing high-quality...
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6348554 |
Method for preparation of a liquid polymer composition and use of this composition
The invention concerns a method for preparation of a liquid polymer composition, where ethylenically unsaturated monomers are polymerized by means of initiators that have a transferable atomic...
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6087458 |
Initiator composition for polymerizing unsaturated monomers
An initiator composition for polymerizing unsaturated monomers, comprising a component (A) which is a mixture of i) at least one salt of a metal in the second sub-group of the periodic table,...
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6080819 |
Blends of olefin polymers and syndiotactic vinyl polymers
Blends of olefin polymers and syndiotactic vinyl polymers are produced by the catalytic polymerization of olefins and aromatic vinyl compounds or methacrylate esters as vinyl compounds in inert...
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5905125 |
Process for producing polybutadiene
A high cis-1,4-polybutadiene is produced, with reduced gel formation, by preparing a catalyst from (A) a cobalt compound, (B) a trialkyl (C 1 -10) aluminum compound, (C) a halide compound selected...
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5886202 |
Bridged fluorenyl/indenyl metallocenes and the use thereof
Bridged fluorenyl/indenyl metallocenes having substituents at the 3 position of the indenyl and the use thereof in the polymerization of olefins are disclosed. Also a new method for preparing...
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5880231 |
Synthesis of telechelic polymers using ruthenium and osmium carbene complexes
Disclosed are ruthenium and osmium carbene compounds which are stable in the presence of a variety of functional groups and which can be used to catalyze olefin metathesis reactions on unstrained...
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5691429 |
Manufacturing process for high cis poly(butadiene)
A process for the manufacture of linear, substantially gel free, high cis 1,4 poly(butadiene) comprising polymerization in the presence of (a) a catalyst comprising at least one cobalt compound, at...
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5677400 |
Process for producing syndiotactic-1,2-polybutadiene
In a process for producing syndiotactic-1,2-polybutadiene by suspension polymerization wherein a mixture composed of 1,3-butadiene, a cobalt compound, and an organometallic compound or metal...
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5627244 |
Process producing a polymer comprising an unsaturated carboxylic acid or a derivative thereof
Disclosed is a process for producing a polymer of an unsaturated carboxylic acid or a derivative thereof, the process comprising polymerizing an unsaturated carboxylic acid or a derivative thereof...
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5525678 |
Process for controlling the MWD of a broad/bimodal resin produced in a single reactor
A bimetallic catalyst produces broad or bimodal molecular weight distribution polyolefin resin whose composition depends on the ratio of the concentration of the two metals of the catalyst...
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5397851 |
Process for cis-1,4-polybutadiene production with reduced gel formation
A process for producing high cis-1,4-polybutadienes wherein there is reduced gel formation is provided which process comprises: polymerizing 1,3-butadiene in a polymerization medium comprising an...
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5342909 |
Ruthenium and osmium metal carbene complexes for olefin metathesis polymerization
Processes for the synthesis of several new carbene compounds of ruthenium and osmium are provided. These novel complexes function as stable, well-defined catalysts for the metathesis polymerization...
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5239023 |
Process for the synthesis of crystallizable 3,4-polyisoprene and isoprene-butadiene copolymers having high vinyl contents
Crystallizable 3,4-polyisoprene and isoprene-butadiene copolymers having high vinyl contents can be synthesized in organic solvents to quantitative yields after short polymerization times by...
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5117327 |
Norbornene dicarboximide polymer dielectric devices
Electrical devices, e.g. molded circuit boards, connectors and capacitors, fabricated from electrical insulating component, comprising norbornene dicarboximide thermoplastic polymer exhibiting a...
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5061765 |
Process for the synthesis of a high vinyl isoprene-butadiene copolymer
Isoprene-butadiene copolymers having high vinyl contents can be synthesized in organic solvents to high yields after short polymerization times by utilizing the process of this invention. The...
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5011896 |
Syndiotactic 1,2-polybutadiene synthesis in an aqueous medium
Pure syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made...
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4742137 |
Polymer particles and process for producing the same
An aqueous dispersion of polymer particles each consisting essentially of (a) a syndiotactic 1,2-polybutadiene having 70% or more of unsaturated hydrocarbon groups in the side chains and having a...
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4699960 |
Process for the polymerization or copolymerization of butadiene
The present invention relates to the production of 1,4-cis-polybutadiene and of copolymers of butadiene with other conjugated diolefins, by means of the catalytic polymerization or copolymerization...
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4645809 |
Direct method for preparing syndiotactic 1,2-polybutadiene
Short fibers of syndiotactic 1,2-polybutadiene are utilized in making tires that have improved resistance against heat build-up and improved wear characteristics. The preparation of syndiotactic...
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4501867 |
Method for producing a polybutadiene material
A 1,2-polymerization of 1,3-butadiene is carried out in a polymerization solvent in the presence of a 1,2-polymerization catalyst consisting essentially of a cobalt compound soluble in the...
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4476287 |
Process for producing polybutadiene rubber with enhanced mechanical strength
A polybutadiene rubber having an enhanced mechanical strength is produced in such a manner that the content of water in a solution of 1,3-butadiene in an inert organic solvent is controlled to 0.2...
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4373074 |
Acetylene-conjugated diene polymerization
A process for preparing copolymers of acetylene and conjugated diene compounds by copolymerization of acetylene with at least one conjugated diene compound in the presence of a catalyst composition...
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4303769 |
Process for preparing substantially gel-free cis-1,4-polybutadiene
Substantially gel-free cis-1,4-polybutadiene is prepared by an improved process comprising adding in any order to the polymerization vessel butadiene, a cobalt catalyst, water and a solvent,...
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4255543 |
Process for the preparation of 1,2-polybutadiene
In the preparation of 1,2-polybutadiene with a vinyl content of at least 70% by contacting 1,3-butadiene with a catalyst consisting of: (A) a cobalt compound, (B) an organic phosphine...
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4224426 |
Polymerization process for cis-1,4-polybutadiene using cycloalkane solvents and an aromatic polymerization regulator
Substantially gel-free cis-1,4-polybutadiene is produced by polymerizing butadiene in the presence of a catalyst comprising a mixture of a cobalt compound, at least one organoaluminum compound and...
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4182814 |
Process for the production of polybutadiene having a high cis-1,4-content
A process for the production of polybutadiene having a high cis-1,4-content by the polymerization of 1,3-butadiene in an aliphatic solvent in the presence of a catalyst consisting essentially of ...
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4176219 |
Process for the production of 1,2-polybutadiene with regulated molecular weight
In the production of 1,2-polybutadiene by contacting 1,3-butadiene with a catalyst composed of (A) a cobalt compound, (B) an organic phosphine compound, (C) trialkylaluminum and (D) water in an...
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4009150 |
Time-lapse free-radical polymerizable composition
A time-lapse free-radical polymerizable composition which comprises (1) a free-radical polymerizable compound such as an ethylenically unsaturated monomer or a reactive polymer; (2) a soluble...
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3959234 |
Method of polymerizing carbonimide norbornene derivatives
A method of polymerizing imide type norbornene derivatives which comprises the ring-opening polymerization of imide type norbornene derivatives containing at least one N-substituted cyclic imide...
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3939134 |
Catalytic process for preparing polymers and copolymers of acrylonitrile
A method of polymerizing acrylonitrile monomer or copolymerizing a mixture of acrylonitrile monomer and further ethylenically unsaturated monomer copolymerizable therewith which comprises...
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3928303 |
Process for producing butadiene polymer
A process for polymerization of butadiene which comprises contacting butadiene with a catalyst system comprising (A) an organic aluminum fluoride compound of the formula: AlR 3 -n F n wherein R...
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3892722 |
Method for preparing stereoregular 1,4-transpolymers of 2-alkyl- butadienes-1,3 or stereoregular 1,4-transcopolymers of 2-alkylbutadienes-1,3 with butadiene-1,3
A method for preparing stereoregular 1,4-transpolymers of 2-alkylbutadienes-1,3 or stereoregular 1,4-transcopolymers of 2-alkylbutadienes-1,3 with butadiene-1,3 consisting in that...
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3860568 |
NOVEL POLYMERIZATION INITIATOR AND PROCESS FOR POLYMERIZATION USING THE SAME
A process for the polymerization of an olefinic monomer by contacting the monomer with a polymerization initiator having an oxidizing agent, a chelating compound of the metal, in which the metal is...
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3536692 |
PROCESS FOR THE PREPARATION OF HIGHLY CRYSTALLINE POLYMERS OF ALLENE COMPOUNDS
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3498963 |
PROCESS FOR THE CATALYTIC PREPARATION OF 1,2-POLYBUTADIENE HAVING A HIGH PERCENTAGE OF VINYL CONFIGURATION
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3474082 |
POLYMERIZATION OF ETHYLENE TO HIGH MOLECULAR WEIGHT SUBSTANTIALLY LINEAR THERMOPLASTIC POLYETHYLENE
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