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7498399 |
Method of preparing ester-substituted diaryl carbonates
An improved method for the preparation of ester-substituted diaryl carbonates prepared by reacting phosgene with recycle streams of ester-substituted phenols from reaction processes using a...
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7264749 |
Alkyne compounds
The present invention relates to alkyne compounds of the formula I
P 1 —Y 1 -A 1 -Y 3 -(T 1 -B 1 -) m -T 3 -C≡C-T 4 -(B 2 -T 2 -) n...
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7148386 |
Processes for preparing benzoquinones and hydroquinones
A process for the preparation of hydroquinone compounds comprising, reacting an aromatic hydroxy compound with an oxidizing agent in a biphasic solvent system. The reaction is carried out in the...
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7141641 |
Method and apparatus for production of alkyl aryl ether and diaryl carbonate
A method and apparatus for continuously producing an alkyl aryl ether and a diaryl carbonate by reacting a dialkyl carbonate and an aromatic alcohol in presence of a transesterification catalyst.
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7112644 |
Aromatic polycarbonate resin, process for producing the same, optical-part molding material, and optical part
The present invention relates to an aromatic polycarbonate resin which comprises repetitive units originating in residual groups of a 2,2-bis(4-hydroxyphenyl)adamantane compound and a...
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7105626 |
Method for incorporating alkyl ester endgroups to improve the release properties of melt polycarbonate
Alkyl ester end-capped polycarbonates have improved release properties and may be produced by a method comprising the step of combining a polycarbonate having free terminal OH groups with an...
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7091370 |
Process for the preparation of diaryl carbonates
A process for the preparation of an aromatic carbonate is disclosed. The process entails reacting an aromatic hydroxy compound of the formula R—(O—H) k , with carbon monoxide and oxygen,...
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6703473 |
Process for producing polycarbonate
An improvement to the melt transesterification reaction of diaryl carbonate with dihydroxy aryl compound is disclosed. The improvement entails the following steps (i) introducing the resulting...
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6576783 |
Oligonucleotide protecting groups
Methods of preparing bis-protected guanidino groups of formula (IX) comprising the steps of reacting a compound of formula (VIII) with an amine, wherein R′ is a thiopseudourea protecting...
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6166074 |
Pharmaceutical compositions
Pharmaceutical compositions which are useful for the treatment of cancer or illnesses which arise due to an abnormally elevated cell proliferation comprise acyl derivatives of aromatic aldehydes,...
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5854374 |
Phosphonium borohydride compound and process for producing polycarbonate using said compound
A process for producing a polycarbonate including melt polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a phosphonium borohydride catalyst(I), ##STR1##...
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5741829 |
Radiation-curable acrylates with built-in photoinitiators
Radiation-curable (meth)acrylates obtainable by reacting compounds of the formula ##STR1## in which R is C 1 -C 4 -alkyl, aryl or R 1 and R 1 is ##STR2## in which R 2 to R 6 independently of...
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5578694 |
Process for producing aromatic polycarbonate
A process for producing an aromatic polycarbonate is described, which comprises melt-polycondensing an aromatic diol compound with a diaryl carbonate compound in the presence of an...
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5547992 |
Anti-herpes virus and cytomegalovirus polycarbonate oligomers
The oligomers of the present invention are polyureas, polycarbonates, polyesters or polyamides having a number average molecular weight of <10,000. These oligomers are water-soluble, have a...
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5457241 |
Polyalk-1-enyl ethers
This invention relates to the polyalk-1-enyl ethers having the formula ##STR1## which is the reaction product of a hydroxylated compound and an alk-1-enyloxy oxirane and to the process for...
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5420331 |
Cyclic carbonate compounds, method for producing the same and positive photoresist composition using the same
This invention provides a process for producing a cyclic carbonate compound represented by the following formula (5): ##STR1## or the like which is useful as a dissolution inhibitor for use in a...
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5391802 |
Process for cleaving polycarbonates into bisphenols and diaryl carbonates
A process is disclosed for cleaving polycarbonates into bisphenols and diaryl carbonates by transesterifying with phenols in the presence of catalysts. The process entails isolating bisphenols from...
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5359117 |
Processes for producing aromatic polycarbonate oligomer and aromatic polycarbonate
A process for producing continuously an aromatic polycarbonate oligomer by reacting an aromatic dihydroxy compound and an alkali metal base or an alkaline earth metal base with a carbonyl halide...
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5336814 |
Method for recovering bis hydroxy aromatic organic values and bis aryl carbonate values from scrap aromatic polycarbonate
A method is provided for depolymerizing scrap aromatic polycarbonate to salvage component monomers by initially effecting aromatic polycarbonate depolymerization by basic phenolysis to produce a...
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5294729 |
Process for the preparation of a block oligocarbonate
A process for preparing a block oligocarbonate is disclosed. The oligocarbonate conforms to ##STR1## where R denotes hydrogen or ##STR2## and where A denotes an aromatic carbonate structure...
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5292915 |
Compounds containing carbonate groups and carbonyl groups and the preparation and use thereof
The invention relates to compounds containing carbonate groups and carbonyl groups and having the general formula ##STR1## in which R stands for a C 1 -C 4 -alkyl radical, an aryl radical, or a...
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5283351 |
Process for producing an organic carbonate from an organic hydroxy compound and carbon monoxide in the presence of a palladium catalyst
A process for efficiently producing an organic carbonate which comprises reacting an organic hydroxy compound and carbon monoxide in the absence of oxygen and in the presence of a catalyst...
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5276174 |
Alk-1-enyloxy carbonates
This invention relates to radiation curable alk-1-enyloxy carbonate reaction products of a polyhydroxylated compound having the formula ROH and a dialk-1-enyloxy carbonate having the formula...
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5264613 |
Process for preparing ester of hydroxymethylbenzocyclobutenes
A process for preparing carboxylic acid esters of of the formula X--(COOCH 2 A) n wherein A is the residue of a substituted or unsubstituted 3- or 4-benzocyclobutene compound, X is an n-valent...
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5258542 |
Carbonates of acetylenic alcohols
Polymerizable carbonate compounds of the formula: ##STR1## wherein A is an aromatic polycycle, R 1 and R 2 are independently hydrogen atom or alkyl, and n is 1, 2 or 3, are disclosed. They are...
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5248805 |
Radiation-senstive, ethylenically unsaturated, copolymerizable compounds and their preparation
Radiation-sensitive, ethylenically unsaturated compounds and a process for their preparation. The ethylenically unsaturated organic compounds are of the general formula ##STR1## where R is alkyl,...
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5221761 |
Melt transesterification process for the production of polycarbonates
A melt transesterification process for the production of polycarbonates, wherein at least one bis(aryl)carbonate is reacted with at least one dihydric phenol in the melted state, in the presence of...
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5214183 |
Method for making oligomeric bisphenol monochloroformate polycarbonate oligomers and product
A process for making bisphenol monochloroformate polycarbonate oligomers is provided by continuously introducing phosgene into a bisphenol mixture under agitated interfacial conditions. The pH of...
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5191124 |
Sulfonium salts having acid-labile groups
Sulfonium salts of the general formula ##STR1## where R 1 , R 2 and R 3 are identical or different and are aliphatic and/or aromatic radicals which may contain heteroatoms, or two of the radicals...
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5187208 |
Polycarbonate compositions resistant to gamma radiation
A thermoplastic polycarbonate molding composition resistant to gamma-radiation is disclosed. The composition incorporates about 0.05 to 5.0 percent by weight of and end-capped poly(alkyl oxide)...
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5187293 |
Glycerin derivatives
Glycerine derivatives of the formula ##STR1## wherein the residues R 1 , R 2 and R 3 have the significance given in the description, and their hydrates, which inhibit blood platelet activating...
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5175333 |
Transesterification route to quaternary ammonium substituted carbonate esters
A process is reported for preparation of quaternary ammonium type carbonate esters which are useful as bleach precursors in detergent compositions. The process involves transesterification of low...
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5162564 |
Method for making oligomeric carbonate bischloroformates with low phosgene usage
Oligomeric carbonate bischloroformates are prepared with low phosgene usage by phosgenating a dihydroxyaromatic compound in an interfacial reaction in the presence of small amounts of...
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5159098 |
Alk-1-enyloxy carbamates
The invention relates to alk-1-enyloxy carbamates selected from the group having the formulae ##STR1## wherein R is a saturated or unsaturated, monovalent or divalent hydrocarbon radical having...
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5153341 |
Process for preparing benzenesulfonate salts
An improved process for preparing alkanoyloxyacetyloxybenzenesulfonate salts in which phenyl esters of alkanoyloxyacetic acids (alkanoyloxyacetyloxybenzenes) are sulfonated to yield novel...
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5149856 |
Process for the preparation of carbonic acid diesters containing at least one aromatic ester group
Aromatic and aliphatic-aromatic carbonic acid diesters can be obtained by transesterification of carbonic acid diesters containing aliphatic ester groups if polymeric hydroxystannoxanes are...
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5142086 |
Method for making organic carbonates
A method for making diphenyl carbonate free of color bodies is provided by reacting an organic hydroxy compound, such as phenol with carbon monoxide and oxygen in the presence of an effective...
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5140044 |
UCN-1028D derivatives
A UCN-1028D derivative represented by the formula: ##STR1## has protein kinase C inhibitory activity and is expected to be used as an active ingredient in anti-tumor agents, etc.
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5134161 |
Method for treating disease states in mammals with naphthalene lipoxygenase-inhibiting agents
Psoriasis in mammals is relieved by topically administering naphthalenes of the formula: ##STR1## wherein: R 1 is lower alkoxy or optionally substituted phenoxy, R 2 is the same as R 1 , or R...
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5091560 |
Method for synthesizing acyloxycarboxylic acids
A method for synthesizing an acyloxycarboxylic acid by providing a reaction chamber, establishing sources of an α-hydroxycarboxylic acid and an acid chloride, and repeatedly contacting...
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5043089 |
P-sulphophenyl alkyl carbonates and detergent compositions and detergent additives containing these compounds
The present disclosure relates to novel p-sulphophenyl alkyl carbonates, wherein the alkyl group contains 6 to 10 carbon atoms. These compounds are suitable bleaching activators. Also disclosed are...
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5041600 |
Bisphenol ethers
Arylcyclobutenealkyl diethers of oligomers containing a plurality of aromatic rings at least two of which are joined by a sulfone moiety, are self-curing at temperatures above about 150° C. The...
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5011966 |
Low phosgene method for preparing aromatic bischloroformates
Aromatic bischloroformates are prepared by the reaction of a dihydroxyaromatic compound such as bisphenol A with phosgene in the presence of water, base and an organic liquid such as methylene...
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4994594 |
Oligomeric carbonate chainstoppers
Oligomeric carbonate dihydroxyaromatic-based chainstoppers are disclosed. One example of this type of chainstopper is a bisphenol A bischloroformate oligomer monocapped with phenol. These...
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4973729 |
Method for preparing hydroquinone and hydroquinone-bisphenol a Bischloroformates
Bischloroformates of bisphenol compositions comprising hydroquinone or a hydroquinone-bisphenol A mixture are prepared by passing phosgene into a vigorously agitated mixture of water, an alkaline...
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4973728 |
Preparation of aromatic carbonates
Aromatic carbonates useful for the preparation of high molecular weight polycarbonate resins are prepared by reacting methanol, carbon monoxide and oxygen to prepare dimethyl carbonate; reacting a...
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4956424 |
Novel poly (alkylene carbonate) polyahls having more than one pendant acid group
Poly(alkylene carbonate) polyahl polymers containing two or more acid-terminal moieties are disclosed. Acid-terminal polyahls provided herein are useful as surfactants or as intermediates for the...
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4900476 |
Quinone intermediates for asymmetric synthesis of natural vitamin E
An asymmetric synthesis for Vitamin E in an optically active pure form for 4-(2,5-diloweralkanoyloxy)-3,4,6-trimethylphenyl-butan-2-one
and intermediates therein.
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4871472 |
Esters in ferroelectric mixtures
Compounds of the formula I ##STR1## wherein R 1 and R 2 each independently of one another are R, OR, OCOR, COOR or OCOOR, is alkyl with 1 to 15 C atoms, wherein one or more CH 2 groups which...
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4870127 |
Poly (alkylene carbonate) polyahls having on the average up to one acid-terminal moiety and salts thereof
Novel acid-functional poly(alkylene carbonate) polyahls and their salts having surfactant activities are disclosed. These polyahls have, on the average, at least about 0.05 and up to about and...
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