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| Number | Title | Issue Date |
| 6100374 | Method of purifying crude naphthalenedicarboxlic acid and process for preparing polyethylene naphthalate The process for preparing polyethylene naphthalate according to the invention is intended to obtain polyethylene naphthalate having a low impurity content from naphthalenedicarboxylic acid containing impurities. This process comprises the steps of: mixing... | 08/08/2000 |
| 5847070 | Hydroxy ethyl bibenzoate New compounds including bis-ଲ-hydroxy ethyl bibenzoate containing less than 2.5%, and preferably less than 1%, diethylene glycol and a process for the production of the bis-ଲ-hydroxy ethyl bibenzoate by the condensation of 4,4'-biphenyl dicarb... | 12/08/1998 |
| 5455025 | Non-aqueous emollient compositions for topical application Non-aqueous compositions for topical application comprising one or more active ingredients and a fatty alkoxylate ester emollient agent comprising a diester or triester of an aliphatic or aromatic tricarboxylic acid formed by reacting the acid with a stoi... | 10/03/1995 |
| 5364956 | Diester, composite ester and polyester having ether-ester terminal structure The compound described in the present invention is represented by the following general formula: R1 (OCH2 CH2)n O(COACOOXO)m COACO(OCH2 CH2)k OR2 wherein A is ... | 11/15/1994 |
| 5302377 | Fatty alkoxylate esters of aliphatic and aromatic dicarboxylic and tricarboxylic acids as emollients Fatty alkoxylate esters which are diesters or triesters of an aliphatic or aromatic dicarboxylic or tricarboxylic acid formed by reacting the acid with a stoichiometric excess of one or more polyalkoxylated fatty alcohols. Compositions for topical applica... | 04/12/1994 |
| 5243013 | Polyester polyols and their use as anchoring agents for polymer systems and as polymeric plasticizers The new polyester polyols, which have an acid value below 10, a hydroxyl value of 50 to 200, a hydroxyl functionality above 2 and a number average molecular weight Mn of 800 to 5,000 and which are liquid at 23° C. or are homogeneously soluble ... | 09/07/1993 |
| 5204454 | Prepolymeric polyols containing mesogenic units Prepolymer polyols containing mesogenic moieties useful as reactants for the preparation of resinous materials are disclosed. Synthesized by condensing a polyether polyol with bifunctional mesogenic diacids, or diesters, the compounds of the invention are... | 04/20/1993 |
| 5015759 | Process for increasing the direct esterification reaction rate of a diacid with a glycol A process for increasing the direct esterification reaction rate between a diacid and 1,4-butanediol and for directly esterifying greater than 95% of the acid ends of the diacid by mixing in any order the diacid, the 1,4-butanediol and a catalyst compound... | 05/14/1991 |
| 4745211 | Process for the preparation of purified bis(2-hydroxyethyl) ester of 2,6-naphthalenedicarboxylic acid A process for preparation of a purified bis(2-hydroxyethyl) ester of 2,6-naphthalenedicarboxylic acid wherein 2,6-naphthalenedicarboxylic acid is reacted with a catalyst comprised of a tertiary amine and a titanium-containing compound in order to produce ... | 05/17/1988 |
| 4681975 | Polyester A polyester being liquid at 25° C. comprises a polybasic acid and a polyhydric alcohol as its monomer constituents, wherein the polyhydric alcohol is composed at least partially of 1,2-butanediol.... | 07/21/1987 |
| 4670580 | Process for preparing oligomeric glycol esters of dicarboxylic acids The invention provides a process for the preparation of a polyester oligomer capable of being further polymerized to a high polymer wherein a glycol-dicarboxylic acid ester feed is treated in a secondary esterification zone under conditions such that the ... | 06/02/1987 |
| 4615822 | Compatibilized polyester polyol blend from phthalic anhydride bottoms A new and highly useful resin prepolymer blend of (a) polyester polyols prepared by esterifying phthalic anhydride bottoms with aliphatic polyols; (b) aliphatic polyol, (c) compatibilizing polyalkoxylated compound, and (d) (optionally) polyalkoxylated ami... | 10/07/1986 |
| 4596886 | Polyester containing impure 1,2-butanediol A polyester being liquid at 25° C. comprises a polybasic acid and a polyhydric alcohol as its monomer constituents, wherein the polyhydric alcohol is composed at least partially of 1,2-butanediol.... | 06/24/1986 |
| 4585889 | Carbonylation process for the production of monoesters aromatic dicarboxylic acids from phosphonium salts The present invention provides a process for the preparation of monoesters of dicarboxylic acids by the carbonylation of carboxyphenyl-triarylphosphonium salts. The carboxyphenyl-triarylphosphonium salts are reacted with carbon monoxide and an alcoho... | 04/29/1986 |
| 4560788 | Process for producing oligoesters A process for producing an oligoester which comprises: (a) the step of reacting isophthalic acid and propylene oxide in a reaction medium in the presence of a specific catalyst comprising a tetraalkyl ammonium compound to prepare an oligoester, and (b) the ste... | 12/24/1985 |
| 4511708 | Process for manufacturing polytetramethylene terephthalate Polytetramethylene terephthalate is manufactured from terephthalic acid and 1,4-butanediol in two stages, a first stage comprising an esterification reaction employing an esterification catalyst and a second stage comprising a condensation-polymerization ... | 04/16/1985 |
| 4506091 | Removal of catalyst residues from polyesters A process for preparing esters which comprises reacting a polycarboxylic acid with an excess of alcohol and in the presence of an organotitanate catalyst, treating the crude mixture with a suitable chelate compound, removing the unreacted alcohol and hydr... | 03/19/1985 |
| 4506090 | Aromatic polyols made from polyethylene terephthalate scrap, glycols and aromatic carbonyl-containing compounds Mixtures of aromatic polyols containing ester functionalities suitable for use as polyol extenders in rigid foams prepared by reacting aromatic carbonyl-containing compounds with an alkylene glycol, the reaction product of which is reacted with recycled p... | 03/19/1985 |
| 4450112 | Process for converting nitriles to carboxylic esters Reaction of a nitrile, an alcohol and water in the presence of a catalyst comprising rhodium, iridium or platinum complexed with hydroxo and tertiary phosphine moieties, to produce the corresponding carboxylic ester.... | 05/22/1984 |
| 4374263 | Process for the production of esters in the presence of a heterogeneous esterification catalyst The invention relates to an esterification process employing as a heterogeneous catalyst an inorganic oxide, e.g. silica, to which there is bonded by reaction with surface hydroxyl groups a sulphonic acid-functionalized silane.... | 02/15/1983 |
| 4365054 | Ethylene glycol terephthalate production A glycol and terephthalic and other aromatic acids are esterified using alkali metal titanates as catalysts and the catalysts are used in polymerization of the ester.... | 12/21/1982 |
| 4365078 | Process for charging dry terephthalic acid into a reactor This invention concerns a method of charging dry terephthalic acid into a reactor which may contain glycol and be under elevated pressure and elevated temperature. According to the invention a suspension of terephthalic acid in a gas such as nitrogen is f... | 12/21/1982 |
| 4346229 | Reaction products of DMT process residue and dipropylene glycol Described is a process for producing unique reaction products from DMT process residue. In the process of this invention DMT process residue is reacted with an excess of dipropylene glycol to give normally liquid, aromatic polyester polyols which are comp... | 08/24/1982 |
| 4204070 | Process for preparing polyethylene terephthalate and its low molecular weight oligomers A process for preparing bis(hydroxyethyl)terephthalate and its low molecular weight oligomers in a reactor equipped with a rectifying column which comprises suspending or dissolving terephthalic acid in molten bis(hydroxyethyl)terephthalate and its low mo... | 05/20/1980 |
| 4146729 | Process for preparing poly(ethylene terephthalate) A continuous process is disclosed for direct esterification of terephthalic acid with ethylene glycol to form low molecular weight polyester with recovery of excess glycol from reaction off-gases. The terephthalic acid is mixed with an excess of glycol, t... | 03/27/1979 |
| 4130552 | Polyester catalyst system and process A polycondensation catalyst consisting essentially of the reaction product of an unsaturated ,ଲ-dicarboxylic acid anhydride and an antimony alkoxide.... | 12/19/1978 |
| 4098901 | Trifluoromethyl substituted compounds having antidepressive activity A compound of the formula ##STR1## and pharmaceutically acceptable acid addition salts thereof, in which formula the group Ro is trifluoromethyl. Pharmaceutical compositions containing these compounds are useful for treatment of depressive... | 07/04/1978 |
| 4097468 | Process for preparing polyesters In a process for the preparation of high molecular weight linear polyesters of terephthalic acid which comprises partially esterifying terephthalic acid with an alkylene glycol under direct esterification conditions and then further esterifying and polyco... | 06/27/1978 |
| 4096124 | Esterification process Terephthalic acid is esterified with an alkylene glycol by heating in a first stage one mole of the acid with at least about 1.2 moles of the glycol and 0.01 to 1.0% based on the weight of the acid of a volatile organic base at a temperature between 240°... | 06/20/1978 |
| 4077945 | Process for making linear polyesters from ethylene glycol and terephthalic acid A batch process for esterifying ethylene glycol and terephthalic acid at elevated temperature and pressure in which a part of the ethylene glycol required for the complete esterification reaction is placed in an autoclave and heated under pressure, and th... | 03/07/1978 |
| 4066627 | Production of polyesters Poly(alkylene terephthalates) are prepared by an improved process which provides high molecular weight, in a shortened reaction time, without excessive loss of the diol reactant to side reactions. In the process an excess of the diol reactant is heated wi... | 01/03/1978 |
| 4039515 | Continuous manufacture of linear polyesters An improved process for the continuous manufacture of linear high molecular weight polyesters by direct esterification of terephthalic acid with excess glycols in a medium comprising terephthalic acid glycol esters or their oligomers, under superatmospher... | 08/02/1977 |
| 4028307 | Preparation of polyesters using salts of substituted quaternary ammonium bases Novel carboxylic acid salts of substituted quaternary ammonium bases and processes for the production of polyesters by direct esterification of a glycol and a dicarboxylic acid involving the additions of such salts to the esterification reaction.... | 06/07/1977 |
| 4020049 | Process for preparing polyester resin The invention is a process for reacting organic dicarboxylic acid and glycol under pressure and at elevated temperature in the presence of low molecular weight polyester resin to produce low molecular weight polyester resin product which can be polymerize... | 04/26/1977 |
| 4018815 | Process for the preparation of polyester polyols Polyester polyols are prepared by the reaction of a polycarboxylic acid or anhydride with a polyhydric alcohol employing in an initial step a stoichiometric excess of polycarboxylic acid or anhydride, thereafter removing between 90 to 95% of the water of ... | 04/19/1977 |
| 4014858 | Polybutylene terephthalate Reaction of terephthalic acid and butane diol using a tetravalent tin catalyst having the organo-to-tin linkage.... | 03/29/1977 |
| 4001187 | Method of producing polyesters terephthalic acid and ethylene glycol Polyethylene terephthalates having high quality, particularly an improved color tone are produced by a direct esterification from particularly defined terephthalic acid and ethylene glycol.... | 01/04/1977 |
| 3988301 | Process for the preparation of high-molecular weight A reaction mixture comprising terephthalic acid and bis(2-hydroxyethyl) terephthalate in a molar ratio of from 1:1 to 1.1:1, and ethylene glycol in a molar ration of from 0.3:1 to 0.9:1 with respect to the terephthalic acid, is heated at a temperature bet... | 10/26/1976 |
| 3965071 | Polyester catalysts Manufacture of polyesters and copolyesters by reaction of at least one aromatic dicarboxylic acid with at least one glycol in presence of titanium compound, deactivation of catalyst by reaction with phosphoric acid or ester and polycondensation in presenc... | 06/22/1976 |
| 3935238 | Preparation of phthalate esters A process for the preparation of a lower alkyl ester of a phthalic acid by contacting an ammonium salt of an aromatic carboxylic acid with vapors of a lower alkanol at a temperature between about 230°C and about 300°C in the presence of an alkaline este... | 01/27/1976 |
