Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7842778 | Polyester process using a pipe reactor The invention is directed to polyester processes where the esterification process at utilizes a vapor removing device, wherein the vapor removing device is substantially horizontally oriented, wherein the esterification effluent forms a two-phase laminar, stratified... | 11/30/2010 |
| 7799892 | Method of making polybutylene terephthalate and compositions and articles comprising the same A process for making modified polybutylene terephthalate random copolymers from a polyethylene terephthalate component includes reacting an oligomeric diol component selected from the group consisting of bis(hydroxybutyl) terephthalate, bis(hydroxybutyl)isophthalate... | 09/21/2010 |
| 7541423 | Polyester process using a pipe reactor The invention is directed to polyester processes that utilizes a pipe reactor in the esterification, polycondensation, or both esterification and polycondensation processes. Pipe reactor processes of the present invention have a multitude of advantages over prior ar... | 06/02/2009 |
| 7381787 | Polytrimethylene terephthalate having a low level of acrolein and a process for producing the same The present invention provides a process of reducing acrolein by product from polytrimethylene terephthalate using selected phosphorus compounds to contact the polytrimethylene terephthalate or reactants in the process of producing polytrimethylene terephthalate. Th... | 06/03/2008 |
| 7271236 | Preparation method of polyester resin A preparation method of a polyester resin includes: under predetermined depolymerization conditions, mixing a polyester resin, a resin dissolvent and a polycondensation catalyst to depolymerize the polyester resin and form a first reaction mixture; adding a first mo... | 09/18/2007 |
| 7241854 | Thermoplastic polyurethanes Thermoplastic polyurethanes are obtainable by reacting (a) isocyanates with (b1) polyesterdiols having a melting point greater than 150° C., (b2) polyetherdiols and/or polyesterdiols, each having a melting point of less than 150° C. and a molecular weight of from ... | 07/10/2007 |
| 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 effected in “n” reaction pressure stages connected in series, the pre... | 12/26/2006 |
| 7115320 | Polyester film and gas-barrier polyester film In order to provide a polyester film having superior impact resistance and flex pinhole resistance, and further exhibiting superior gas barrier properties after a metal or metal oxide is deposited on the film, with the inherent characteristics of polyester film main... | 10/03/2006 |
| 6905774 | Biaxially-oriented polyester film for fabrication and method of producing the same Biaxially-drawn polyester film for fabrication which is characterized in that it is a film comprising polyester in which ethylene terephthalate units and/or ethylene naphthalate units are the chief structural component, and the melting point of said film is 180-270... | 06/14/2005 |
| 6812321 | Method for the continuous production of polybutyleneterephthalate from terephthalic acid and butanediol In a process for the continuous preparation of polybutylene terephthalate from terephthalic acid and 1,4-butanediol comprising: a) direct esterification of terephthalic acid with 1,4-butanediol in a reactor cascade comprising at least two reactors,... | 11/02/2004 |
| 6809172 | Polyester polyols and the use of polyester for producing PUR cast elastomers that have an improved resistance to hydrolysis The polyester polyols according to the invention with an average equivalent weight in the range from 200 to 4,000, which were prepared by reacting α,ω-dicarboxylic acids with butane 1,4-diol, hexane 1,6-diol, propane 1,3-diol or pentane 1,5-diol and with polyols h... | 10/26/2004 |
| 6762235 | Polybutylene terephthalate resin and compositions and molded articles comprising the resin A polybutylene terephthalate resin having 30 eq/t or less of carboxyl end group, a crystallization temperature in a temperature decrease of 175° C. or higher and an amount of residual tetrahydrofuran of 300 ppm by weight or less; and compositions and molded article... | 07/13/2004 |
| 6710158 | Methods for making polyester bottle resins having reduced frictional properties The invention is a polyester resin that includes between about 20 and 200 ppm of an inert particulate additive, preferably selected from the group consisting of surface-modified talc and surface-modified calcium carbonate. The invention is also a method of making th... | 03/23/2004 |
| 6652979 | Biaxially-oriented polyester film for fabrication Biaxially-drawn polyester film for fabrication which is characterized in that it is a film comprising polyester in which ethylene terephthalate units and/or ethylene naphthalate units are the chief structural component and containing 0.1-2 wt % of a carna... | 11/25/2003 |
| 6630601 | Methods for the preparation or purification of bis-ଲ-hydroxyethyl terephthalate An aromatic polyester is pre-decomposed by heating together with bis-ଲ-hydroxyethyl terephthalate and/or a low condensate thereof and then, reacted with ethylene glycol to convert the terephthalic acid component of the pre-decomposed product into bi... | 10/07/2003 |
| 6613259 | Process of making polyester pellets A process for preparing polyester pellets which involves blending polyethylene terephthalate and polyethylene isophthalate copolymer before solid state polymerization, the polyethylene isophthalate copolymer being composed of dicarboxylic acid constituent... | 09/02/2003 |
| 6436497 | Polyester stretch blow bottle and production thereof A stretch blow bottle made from a polyester resin composition which comprises: (A) 60 to 99% by weight of a polyethylene terephthalate resin and (B) 1 to 40% by weight of a polyethylene isophthalate resin, wherein 300 square microns of a section exposed b... | 08/20/2002 |
| 6320014 | Polyester pellets Disclosed are polyester pellets made of a polyester which comprises dicarboxylic acid constituent units derived from dicarboxylic acids containing terephthalic acid and isophthalic acid and diol constituent units derived from diols containing ethylene gly... | 11/20/2001 |
| 5977292 | Process for the preparation of polyesters in carbon dioxide The present invention provides processes for preparing polyesters. The processes include (a) providing a polymerization medium comprising carbon dioxide, (b) contacting a monomer capable of forming a polyester polymer with the polymerization medium, and (... | 11/02/1999 |
| 5854377 | Continuous preparation of thermoplastic polyesters A process for the continuous preparation of thermoplastic polyesters by a) a first step of (trans)esterifying a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of a dihydroxy compound, b) a second step of precondensing the (trans)es... | 12/29/1998 |
| 5652033 | Polyester polymers and products A cobalt/aluminum catalyst is used in the polymerization reaction to form polyesters of terephthalic acid and an ethylene glycol.... | 07/29/1997 |
| 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) esters with or without aliphatic dicarboxylic acids with ... | 06/04/1996 |
| 5512340 | Catalyst and process for producing polyester A cobalt/aluminum/chlorine catalyst for the polymerization of polyesters of terephthalic acid and an ethylene glycol, a process for the preparation of such catalysts, a process for the polymerization of terephthalic acid and an ethylene glycol, a process ... | 04/30/1996 |
| 5478909 | Process for obtaining modified polyethylene terephthalate pilling-free fibres originating from the polymer thus modified The present invention relates to a process for obtaining continuously polyethylene terephthalate modified by --SiO-- groups in a proportion of 30014 700 ppm of Si during the direct esterification reaction between terephthalic acid and ethylene glycol, fol... | 12/26/1995 |
| 5468441 | Process for preparing high-molecular weight polyesters A high-molecular-weight polyester is prepared by polycondensing an aromatic dicarboxylic acid with a mixture of alkanediols and alkenediols with substantial exclusion of oxygen and in the presence of a catalyst, until a viscosity number in the range from ... | 11/21/1995 |
| 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 the melt, the polycondensate is pelletized, and the pelle... | 11/08/1994 |
| 5322921 | Polyester yarn The method for producing dimensionally stable, low-shrinkage, chemically modified industrial polyester yarns by melt spinning at speeds of 1000 to 4000 m/min. utilizes a copolymer containing at least 85 percent by weight polyethylene terephthalate units a... | 06/21/1994 |
| 5254288 | Process for the production of polyester with increased electroconductivity A continuous direct esterification and polycondensation process is disclosed in view of the production of polyester comprising units of ethylene terephthalate as the major repeating units, said polyester being substantially improved in particular in respe... | 10/19/1993 |
| 5243022 | Method for forming polyesters A method for forming polyesters (polyethylene terephthalate, PET) having a high degree of polymerization with improved color and lower diethylene glycol (DEG) content in a shorter period of time than in known methods. The method according to the invention... | 09/07/1993 |
| 4705844 | Rapidly crystallizing polyester materials and a process for their preparation The invention relates to rapidly crystallizing polyester materials and a process for their preparation, in which, in a first stage, the polyester is prepared in the presence of an (alkaline earth) alkali metal or of an (alkaline earth) alkali metal compou... | 11/10/1987 |
| 4613678 | Esterification of aromatic dicarboxylic acids with cyclic alkylene carbonates Esterification of aromatic dicarboxylic acids with cyclic alkylene carbonates in the presence of organic compounds containing at least one six-membered aromatic nitrogen-containing heterocyclic moiety.... | 09/23/1986 |
| 4611049 | Process for producing aromatic polyester A process for producing an aromatic polyester having an aromatic dicarboxylic acid as a main acid component and trimethylene glycol or tetramethylene glycol as a main glycol component from a starting material composed mainly of an aromatic dicarboxylic ac... | 09/09/1986 |
| 4581093 | Branched polyester adhesive compositions and method employing same Described are adhesives formed from certain diol/higher polyol/aromatic acid/aliphatic acid branched polyesters and laminates using them.... | 04/08/1986 |
| 4578502 | Polyethylene terephthalate saponification process Solid scrap polyethylene terephthalate (PET) resin may be reprocessed by depolymerizing said scrap in the presence of water or methanol, recovering the monomers resulting from the depolymerization reaction and repolymerizing the monomers to form polymeric... | 03/25/1986 |
| 4469718 | Process for manufacturing polyester resin insulated wires A process for manufacturing a polyester resin insulated wire involves coating a resin consisting essentially of a saturated substantially linear polyester resin prepared by reacting (i) an aromatic dicarboxylic acid or a dicarboxylic acid in which an alip... | 09/04/1984 |
| 4396746 | Thermoplastic polyester copolymer A thermoplastic polyester copolymer comprises units derived from (A) terephthalic acid, a diol mixture of (B-1) 60 to 95 mol % of 2-methyl-1,3-propanediol and 5 to 40 mol % of 1,4-cyclohexanedimethanol, or (B-2) 5 to 95 mol % of 2-methyl-1,3-propanediol a... | 08/02/1983 |
| 4329444 | Production of polyesters Poly(butylene terephthalates) are prepared by an improved process which makes it possible to directly esterify terephthalic acid and 1,4-butanediol without excessive loss of the diol reactant to side reactions. In the process, the conditions are controlle... | 05/11/1982 |
| 4313870 | Process for producing polycondensates In a method producing a polycondensate by bulk polycondensation of a monomer (or a reactant mixture) which is a fluid at the polycondensation temperature, an improvement which comprises carrying out the polycondensation until substantially the whole polyc... | 02/02/1982 |
| 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, comprising the condensation of polyester precondensates having... | 02/03/1981 |
| 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, and a solid state polymerization in a static bed until the i... | 12/09/1980 |
