| Patent Number |
Title Of Patent |
Date Issued |
| 7244806 |
Method and device for the continuous production of polyesters |
July 17, 2007 |
| In the continuous production of polyesters, the esterification/transesterification of dicarboxylic acids or esters of the dicarboxylic acids with diols is performed in at least one reaction stage, the prepolycondensation of the esterification/transesterification product is performed |
| 7241855 |
Method for the manufacture of polyesters |
July 10, 2007 |
| A method is described for the manufacture of polyesters of aromatic dicarboxylic acids with aliphatic and/or cycloaliphatic dials, in which an aromatic dicarboxylic acid in the presence of a monocarboxylic acid or a mixture of a monocarboxylic acid present in a saturated solution with |
| 7204265 |
Bursting insert |
April 17, 2007 |
| The present invention relates to a bursting insert for installation in a pipeline system for transporting a fluid showing a spontaneous exothermic reaction. The bursting insert comprises a wall which surrounds--at least in part on the outside--a passage volume having the fluid flowing |
| 7173127 |
Method for the manufacture of caprolactam from waste containing polyamides |
February 6, 2007 |
| This invention relates to a continuous and efficient method for the manufacture of highly pure caprolactam suitable for the polycondensation of Polyamide 6 (polycaprolactam) from polyamide waste. In particular the invention relates to a method for the manufacture of caprolactam from |
| 7129347 |
Method for purifying caprolactam from waste containing polyamide using UV radiation |
October 31, 2006 |
| The invention relates to a method for the continuous production of caprolactam from waste containing polyamide, comprising a) depolymerisation of the waste containing polyamide, whereby a caprolactam raw material and, where applicable, a flow containing secondary constituents or ad |
| 7084235 |
Method of producing highly condensed polyester granulate |
August 1, 2006 |
| Latent heat crystallized polyesters and copolyesters of a degree of crystallization greater than 38% and made by a process in which, without prior additive admixtures and without further cooling, the granulate is fed directly from the latent heat crystallization into a solid phase po |
| 7084234 |
Method and device for producing polyesters, copolyesters and polycarbonates |
August 1, 2006 |
| In a process for producing polyester, the esterification of dicarboxylic acids and diols is carried out in at least one reaction stage, the prepolycondensation of the esterification product in at least one reaction stage and the polycondensation of the prepolycondensation product in |
| 6967235 |
Method for the production of polybutylene terephthalate |
November 22, 2005 |
| In a process of producing PBT, a mixture of BDO and TPA is esterified in the presence of a catalyst solution, and the esterification product is polycondensated. To avoid the formation of deposits in the PBT, the catalyst solution contains 0.05 to 10 wt-% alkyl titanate, 85 to 99 wt-% |
| 6887410 |
Parallel spinning process involving the intermingling of threads between galettes and a correspo |
May 3, 2005 |
| A parallel spinning process, in particular for filaments, e.g. for textile or industrial applications, made from polymers such as, for example, PET or PA, in each case having a thread interlacing device between two godets for each individual thread, the godets being moved in relation to |
| 6877305 |
Method and device for detecting a thickening in a running thread |
April 12, 2005 |
| The invention relates to a method and to a device for detecting a thickening in a running thread. The thread runs through a forked guide element which is moved away from an initial position by a thickening in the thread, thereby triggering a signal. While the guide element is moved a |
| 6800718 |
Process for producing polytrimethylene terephthalate (PTT) |
October 5, 2004 |
| Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic, titanium compound, precondensation and polycondensation. The esterification is effected in at least two stages, where in t |
| 6790392 |
Application of a vaporous mist for spining systems with rectangular nozzles |
September 14, 2004 |
| A method and apparatus for the steam misting of rectangular nozzles and spinning systems equipped therewith for producing polyamide filaments whereby the steam feed is conducted through a tube loop which is passed through the heating chamber of the spinning beam so that the steam is |
| 6736624 |
Spinning device for spinning molten polymers and method for heating the spinning device |
May 18, 2004 |
| The invention relates to a spinning device in which liquid polymer is guided through a polymer line with a first heating jacket to a spinning pump with a second heating jacket. From said spinning pump, the polymer is transported through several lines to spinning packets and extruded thro |
| 6716016 |
Self-sealing compact spinneret for a melt spinning process |
April 6, 2004 |
| The invention relates to a spinneret for spinning thermoplastics. Said spinneret comprises a central polymer inlet channel, a filter assembly (2), consisting of one or more filter plates of various filtration grades, a spinneret plate (3) and a housing (1) which receives and tightly |
| 6652255 |
Cooling system for filament bundles |
November 25, 2003 |
| A cooling system for filament bundles, which are spun from polymer melt by at least two spinneret units (1) disposed one beside the other and are drawn off by a draw-off system (17), the filament bundles (3a, 3) being cooled in a three-part shaft (A, B, C) by an equidirectional air strea |
| 6420025 |
Method for producing ultra-fine synthetic yarns |
July 16, 2002 |
| A process of producing a synthetic ultrafine endless yarn on the basis of polyester or polyamide in the range from 0.25 to 0.9 denier per POY filament by melt spinning at draw-off speeds between 2000 and 6000 m/min with a high spinning safety. To the polyester or polyamide a second i |
| 6417320 |
Catalyst and method for its production and use |
July 9, 2002 |
| The production of linear polyester by the interchange of ester radicals or esterification and polycondensation of multivalent alcohols with multivalent carboxylic acids takes place by means of catalysts. In order that the catalyst features the lowest possible content of catalytically |
| 6383433 |
Copolyester fibers |
May 7, 2002 |
| The present invention provides a copolyester fiber consisting of a copolyester with primarily C.sub.2-4 alkylene terephthalate units and a process for producing these copolyester fibers.The copolyester contains more than 4 wt % up to 12 wt % poly(C.sub.2-4 alkylene glycol) units and 60 t |
| 6358578 |
Method for the production of polyester with mixed catalysts |
March 19, 2002 |
| The present invention comprises a method of producing polyester transesterification of at least a dicarboxylic acid dialkyl ester or esterification of at least a dicarboxylic acid with at least a diol and subsequent precondensation and polycondensation in the presence of the usual ca |
| 6357762 |
Sealing element for melt channels |
March 19, 2002 |
| The invention provides a sealing element for spinning systems used for spinning polymer melts, wherein the sealing element seals the transition between a polymer melt conducting melt channel of a permanently mounted component and a melt channel of a removable, interchangeable component. |
| 5968433 |
Process for spinning of solutions of cellulose carbamate |
October 19, 1999 |
| The invention is a process for spinning solutions of cellulose carbamate by extruding the solution through a spinneret into a precipitation bath, coagulating the cellulose carbamate fibers thus formed and drawing off the fibers by mechanical means, where the fibers are enveloped from the |
| 5798433 |
Process for production of polypropylene terephthalate |
August 25, 1998 |
| The present invention provides a method of synthesizing polypropylene terephthalate with no more than 5 ppm acrolein and no more than 3 ppm allyl alcohol. The method comprises direct esterification of terephthalic acid with 1,3-propanediol in the presence of 30 to 200 ppm titanium in the |
| 5686513 |
Process for the production of stabilizer concentrate for polyamide |
November 11, 1997 |
| A process for the production of a polyamide stabilizer concentrate in which the concentrate consists of at least two interactive stabilizer components with defined particle sizes and, optionally, micro-dispersed silicic acid, as well as a wax bonding agent with a solidification temperatu |
| 5656716 |
Titanium-containing catalyst and process for the production of polyester |
August 12, 1997 |
| The present invention comprises a new catalyst for the production of polyesters consisting essentially of a finely dispersed, large surface area titanium compound selected from hydrated TiO.sub.2 obtained by hydrolysis and having the composition yTiO.sub.2.zH.sub.2 O and from titanat |
| 5598980 |
Process for the separation of carpet materials |
February 4, 1997 |
| Process for separating preshredded carpet materials into as many as three main components of different densities which comprises finely comminuting the carpet materials in the liquid phase. The density of the liquid phase is adjusted to a level between two adjacent densities of the compo |
| 5466776 |
Process for the multistage generation of vacuum for polyester production |
November 14, 1995 |
| Process for multi-stage generation of a vacuum and condensation and recycling of the vapors of polycondensation in the production of polyester, where the last stage includes a liquid ring pump compressing to atmospheric pressure, a cooler and a degasifier tank. The process also inclu |
| 5466776 |
Process for the multistage generation of vacuum for polyester production |
November 14, 1995 |
| Process for multi-stage generation of a vacuum and condensation and recycling of the vapors of polycondensation in the production of polyester, where the last stage includes a liquid ring pump compressing to atmospheric pressure, a cooler and a degasifier tank. The process also inclu |
| 5378827 |
Process for the production of cellulose carbamate |
January 3, 1995 |
| A process for the production of cellulose carbamate from cellulose and urea through the conversion of the cellulose with excess urea in an inert liquid organic reaction carrier at a temperature in the range of 130 .degree. to 160.degree. C., separation of the reaction carrier from the |
| 5362844 |
Continuous process for the production of polyester for food packaging |
November 8, 1994 |
| 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 the melt, the polycondensate is pelletized, and the pellets are first hardened, then c |
| 5360589 |
Process for producing synthetic filaments |
November 1, 1994 |
| A process for producing spin-oriented continuous filaments at a draw-off speed of more than 2400 m/min, whereby the filaments extruded through the spinnerets of the spinning heads are cooled in cooling shafts by the ambient air entrained as a result of the suction action of the filaments |
| 5340517 |
Process for producing synthetic filaments |
August 23, 1994 |
| A process for producing spin-oriented filaments at a draw-off speed of more than 2400 m/min, whereby the filaments extruded from a spinneret are solidified in a cooling shaft solely by the ambient air entrained by the suction effect of the filaments and the cooling shaft having a zone wh |
| 5308892 |
Process for the preparation of polyester-masterbatch containing finely divided additives |
May 3, 1994 |
| Process for the manufacture of a polyester masterbatch containing finely divided solid additives in homogenous and agglomerate-free distribution, through the mixing, within a homogenizing extruder, of the powdery additive into the polyester, whereby, separately from the addition of the |
| 5306804 |
Discontinuous process for the production of a polyamide-6,6 |
April 26, 1994 |
| Discontinuous process for the production of polyamide-6,6 by heating an aqueous AH-salt solution, precondensing the solution with evaporation of water at 6 to 9 bar pressure and polycondensing in the melt phase, whereby the heating rate above 175.degree. C. of the AH-salt solution is at |
| 5304052 |
Spinning block |
April 19, 1994 |
| A spinning block for the melt spinning of polymers, consisting of a melt channel, a coupling which is attached to the spinning bar and a nozzle block casing with a filter element and a spinning nozzle plate. A connector for detachably securing said nozzle block casing to the coupling |
| 5292865 |
Process for preparation and after-treatment of polyester pellets |
March 8, 1994 |
| Process for simultaneous removal of aldehyde, solid-phase postcondensation and drying of linear polyesters and copolyesters by after-treating the polyester pellets with a diffusion surface of 1.95 to 2.90 m.sup.2 /kg, an individual pellet weight of 5 to 15 mg and a bulk density of 750 to |
| 5269348 |
Distributor for viscous fluids with adjustable multiple discharge |
December 14, 1993 |
| Distributor for viscous fluids with a feed line and multiple discharge valves and lines, each comprising a valve housing eccentrically enlarged opposite the discharge line and a valve piston with a hat-shaped valve head surmounted by a mushroom-shaped attachment. The valve piston may be |
| 5266601 |
Process for preparing polybutylene terephthalate from pet scrap |
November 30, 1993 |
| Process for producing polybutylene terephthalate with less than 1.0 wt % units derived from ethylene glycol from polyethylene terephthalate scrap by diolysis and ester exchange with 1,4-butanediol and subsequent polycondensation. |
| 5235027 |
Modified copolyethylene terephthalate |
August 10, 1993 |
| Modified copolyethylene terephthalate, for processing by extrusion blow molding, containing units of isophthalic acid, diethylene glycol and pentaerythritol, antimony and phosphorus plus small amounts of red toner and a blue toner. Also a process for producing same by direct esterifi |
| 5198530 |
Process for continuous polycondensation of terephthalic acid and 1,4-bis(hydroxymethyl)cyclohexa |
March 30, 1993 |
| Process for continuous production of polyesters by esterification of terephthalic acid with 1,4-bis(hydroxymethyl)cyclohexane with a split feed in the presence of a titanium catalyst at 265.degree. to 305.degree. C. and 0.8 to 1.5 bar up to a conversion of 98.0% to 99.0%, then performing |
| 5194573 |
Discontinuous process for polycondensation of terephthalic acid and 1,4-bis(hydroxymethyl)cycloh |
March 16, 1993 |
| Process for discontinuous production of polyesters by esterification of terephthalic acid with a definite excess of 1,4-bis(hydroxymethyl)cyclohexane in the presence of a titanium catalyst at 180.degree. to 300.degree. C. and 0.8 to 1.5 bar up to a conversion of 98.0% to 99.6%, then |
| 4107160 |
Continuous process for the recovery of caprolactam |
August 15, 1978 |
| A process for the continuous recovery of caprolactam from either solid polycaprolactam waste by depolymerization or from liquid polycaprolactam extraction water from an extraction zone where, in either instance, a caprolactam water vapor mixture is produced and subsequently upgraded in a |
| 4069194 |
Process for the solid state polycondensation of linear polyesters |
January 17, 1978 |
| A separating or anticaking agent consisting of spherical glass particles having a diameter of 3 to 30.mu. is added to polyester resin granulates to prevent agglomeration during solid state polycondensation in a plug-flow reactor. Thin-walled articles formed from the end product are c |
| 4064112 |
Process for the continuous production of high molecular weight polyethylene terephthalate |
December 20, 1977 |
| This invention relates to a process for the continuous production of high molecular weight polyethylene terephthalate by polycondensation in the solid phase wherein granulated, dried polyethylene terephthalate, having an intrinsic viscosity of at least 0.15, is first crystallized and is |
