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7211634 |
Process for the preparation of polyesters containing 1,4-cyclohexanedimethanol
Disclosed is a process for the preparation of high molecular weight polyesters by reacting one or more dicarboxylic acids directly with 1,4-cyclohexanedimethanol and, optionally, one or more diols....
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7196159 |
Process for producing polytrimethylene terephthalate
A process for the production of polytrimethylene terephthalate (PTT), wherein the process comprises:
(i) one or more esterification steps, wherein terephthalic acid (TPA) or an alkyl diester of...
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7153927 |
Process of continuously producing polyesters or copolyesters
Process for producing polyesters and copolyesters, wherein a continuous esterification of dicarboxylic esters and diols or a continuous transesterification of dicarboxylic esters with diols is...
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6872460 |
Matt, UV-stable, Thermoformable, co-extruded polyester film, a method for the production thereof and the use of the same
The invention relates to biaxially oriented, co-extruded polyester films. Said films comprise a base layer which consists of at least 70% by weight of a thermoplastic polyester, preferably...
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6872461 |
Matt, flame-retardant, co-extruded polyester film, a method for the production thereof and the use of the same
The invention relates to a co-extruded, biaxially oriented polyester films containing a flame-retardant agent which can be dissolved in the polyester. The film has a matt outer layer which contains...
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5830981 |
Process for producing polyethylene terephthalate
A process for producing a polyethylene terephthalate in which the amount of the oligomers, such as cyclic trimer etc., is lower and which causes metal mold staining to occur difficultly. The...
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5681918 |
Process for preparing copolyesters of terephthalic acid ethylene glycol and 1 4-cyclohexanedimethanol exhibiting a neutral hue high clarity and increased brightness
This invention relates to a three step process for preparing copolyesters exhibiting a neutral hue, high clarity and increased brightness. The process involves reacting terephthalic acid, ethylene...
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5648032 |
Process for producing polyester articles having low acetaldehyde content
Disclosed is a process for producing molded polyester articles having a low acetaldehyde content by a) reacting a glycol and a dicarboxylic acid in the melt phase to form a polyester having an...
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5635589 |
Process for production of condensation polymers
Disclosed is a process for increasing the molecular weight of condensation polymers involving the use of a high velocity rarefied inert gas sweep in the polymer finishing process.
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5573820 |
Process for preparing polyester
The invention provides a process for preparing a polyester comprising a liquid phase polycondensation step in which a dicarboxylic acid including terephthalic acid or its ester derivative and a...
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5523381 |
Production of polyesters of improved whiteness
Described is a process for producing linear polyesters of improved whiteness and reduced yellowness by esterification of aromatic dicarboxylic acids or transesterification of their bis(lower alkyl)...
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5466765 |
Vaccum system for controlling pressure in a polyester process
The present invention discloses a polymerization system having at least two reaction chambers wherein vacuum is used to remove vapors therefrom comprising a single vacuum system for supplying...
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5444144 |
Process for producing polyethylene terephthalate
A process for producing polyethylene terephthalate comprises the following steps 1 and 2: 1 a moisture conditioning step of contacting a polyethylene terephthalate having an intrinsic viscosity...
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5424121 |
Biaxially oriented polyester film
A biaxially oriented polyester film which is characterized as follows: (A) it is composed of an aromatic copolyester which is obtained with use of a germanium compound as the polycondensation...
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5393871 |
Production of polyesters and polyester articles having good clarity
Disclosed is an improvement in a process for producing linear polyesters wherein a precursor polyester is first formed and subsequently the precursor polyester is formed into particles and further...
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5393863 |
Production of branched polyesters
Disclosed is an improvement in a process for producing branched polyesters wherein a precursor polyester is first formed and subsequently the precursor polyester is formed into particles and...
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5362844 |
Continuous process for the production of polyester for food packaging
A continuous process for the production of low-modified polyethylene terephthalate for food packaging in which, while maintaining specific processing conditions, a precondensate is polycondensed in...
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5270444 |
Process for treatment of polyethylene terephthalate, polyethylene terephthalate for molding purposes and process for preparation thereof
According to the present invention, a process which comprises bringing polyethylene terephthalate having an intrinsic viscosity of at least 0.50 dl/g and a density of 1.38 g/cm 3 or more into...
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5115085 |
Process for the preparation of polyester resin
The invention relates to a process for the preparation of polyester and alkyd resins from bifunctional and/or polyfunctional carboxylic acids and/or derivatives thereof and from bifunctional and/or...
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5049647 |
Method for the reduction of impurities in polyester resins
A method for purifying polyethyleneterephthalate reins by contacting the resins with an atmosphere containing carbon dioxide under supercritical conditions.
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5001216 |
***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***
Preparation of polyethylene terephthalate
A process is disclosed for preparing polyethylene terephthalate having a predetermined intrinsic viscosity which involves the direct esterification of terephthalic acid with ethylene glycol...
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4876326 |
Solid state polymerization of polyester prepolymers
High molecular weight polyester resins such as polyethylene terephthalate, are sometimes produced from low molecular weight polyester prepolymers having the same composition by solid state...
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4758650 |
Process and apparatus for producing high molecular weight polyesters
A process and an apparatus for the production of high molecular weight linear polyester is proposed, in which a pumpable material is produced in particular terephthalic acid and an alkaline diol...
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4434276 |
Process for the condensation of poly(alkylene terephthalates)
A process for the post condensation of poly(alkylene terephthalate) in the solid phase is carried out in the presence of esters of phosphorous acid at 25°-65° C. below the melting point of the...
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4387213 |
Process for the condensation of linear polyalkylene terephthalates
A process for condensing a linear polyalkylene terephthalate having a viscosity number of at least 60 cc/g in two stages, at an elevated temperature, in the solid phase, and in the presence of an...
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4289895 |
Method for the preparation of oligomeric alkylene terephthalates
Oligomeric alkylene terephthalates having an average degree of condensation of 4 to 7 are produced by passing dimethylterephthalate and diol having at least 3 carbon atoms downwardly through a...
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4260734 |
Modified fluidized bed
A process (and apparatus therefor) for carrying out thermally-initiated chemical reactions or physical changes by heating a particulate substrate in a fluidized bed having hotter zone(s) and cooler...
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4260721 |
Modified fluidized bed
A process (and apparatus therefor) for carrying out thermally initiated chemical reactions or physical changes by heating a particulate substrate in a fluidized bed having hotter zone(s) and cooler...
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4254253 |
Preparation of high molecular weight polyester
This invention comprises an improvement in the preparation of high molecular weight polyester, said improvement comprising simultaneously and continuously crystallizing, drying and heating low...
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4248996 |
Preparation of linear high molecular weight saturated polyesters
A process for the preparation of high molecular weight linear saturated polyesters derived from dicarboxylic acids or their ester-forming derivatives and aliphatic and/or cycloaliphatic diols,...
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4238593 |
Method for production of a high molecular weight polyester prepared from a prepolymer polyester having an optimal carboxyl content
A high molecular weight polyester is produced by a two stage process: a partial melt process until the intrinsic viscosity of the polyester prepolymer reaches from about 0.35 to about 0.62 dl/g,...
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4237261 |
Process for continuously producing polyester and spun fiber
In a process for continuously producing polyester which comprises continuously polymerizing bis-β-hydroxyethyl terephthalate and/or a lower polymer thereof using a plurality of vacuum...
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4230818 |
Reduction of glycol ethers in polyesters
A process for reducing the glycol ether content in polyesters involves adding a glycol to a polyester oligomer solution prior to polymerization, distilling the oligomer solution to remove vapor...
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4214072 |
Process for the manufacture of linear high molecular weight polyesters
A process for the manufacture of high molecular weight linear polyesters which are derived from dicarboxylic acids or their ester-forming derivatives and from diols, by condensing polyester...
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4208527 |
Process for the manufacture of high molecular weight poly-(ethylene terephthalate)
In a process for preparing high molecular weight poly-(ethylene terephthalate) in two stages, comprising, in the first stage, reacting a dialkyl ester of terephthalic acid with ethylene glycol in...
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4165420 |
Solid state polymerization of polyester prepolymer
The invention relates to an improvement in the solid state polymerization of polyester prepolymer comprising the use of low molecular weight prepolymer having an intrinsic viscosity ranging from...
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4161578 |
Process for solid phase polymerization of polyester
A process for the continuous production of high molecular weight polyethylene terephthalate wherein the granular polymer having an intrinsic viscosity of at least 0.4 is crystallized, dried and...
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4154921 |
Preparation of polyesters
The formation of manganese-derivative scale in equipment involved in polyester manufacture is reduced by introduction of a sterically hindered benzoic acid in approximately stoichiometric amount....
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4153766 |
Continuous process for the production of ethylene terephthalate polyesters
In a continuous process for the production of ethylene terephthalate polyesters, when the control value for the viscosity which relates to the degree of the polymerization in a polymerization...
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4133800 |
Polyester production
Polyesters, e.g. polyethylene terephthalate, are produced by a direct esterification process. The esterification is performed in the presence of a germanium dioxide polycondensation catalyst...
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4106098 |
Computer controlled apparatus for preparation of polyethylene terephthalate
A computer controlled apparatus for the preparation of high molecular weight, high quality polyethylene terephthalate polyester suitable for processing into fibers, films, and other shaped...
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4098845 |
Method for accelerating the crystallization rate of crystallizable polyester resin
This invention relates to crystallizable polyester compositions having improved molding characteristics. Crystallization rates and properties are improved by the addition of a polymer derived from...
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4082724 |
Production of aromatic polyesters of improved color
A polyethylene terephthalate composition comprising highly polymeric polyethylene terephthalate and in an amount sufficient to prevent color degradation of said polyethylene terephthalate (1) a...
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4077944 |
Catalytic production of polyesters
A process for producing polyesters and copolyesters, useful for making films and fibers, by the polycondensation of dicarboxylic acids and aliphatic glycols using certain silicon compounds as...
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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...
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4072663 |
Transfer system for conveying polyester polymer
In the production of polyester fibers in a melt-spinning process, the transfer system between the melt source and the spinning position has a special importance due to the thermal degradation of...
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4016142 |
Process for the control of carboxyl end groups in fiber-forming polyesters
In the preparation of a fiber-forming polyester, the number of free carboxyl end groups present in the polymer may be reduced by adding to the polymerized polyester a glycidyl ether which reacts...
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4010145 |
Process and catalyst inhibitor systems for preparing synthetic linear polyesters
Catalyst-inhibitor system for the polymerization of poly(ethylene terephthalate) having excellent properties for fabrication of fibers and films. The catalyst-inhibitor system comprises a...
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3954902 |
Polyesters with good dyeing affinity and a process for obtaining same
Polyesters having improved affinity for acid dyes are produced by incorporation, in the polyester-forming dicarboxylic acid and dihydric alcohols, quaternary ammonium compounds of the formula...
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3951905 |
Fiber- and film-forming polyester composition
Fiber- and film-forming composition comprising a linear synthetic polyester together with antimony-containing particles, present in an amount of from 0.02 to 1.0% by weight of the composition. The...
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