Abstract:
The present invention relates to a novel polyurethane, copolyether ester or copolyether amide elastomer composition comprising a glycol derived from random copoiymerization of alkylene oxide and tetrahydrofuran (THF), the alkylene oxide having from 2 to 4 carbon atoms, i.e., poly(tetramethylene-co- alkyieneether) glycol.
Abstract:
The present invention provides a method for depolymerization of a mixture comprising oligomeric cyclic ethers resulting from copolymerization of at least one tetrahydrofuran and at least one other cyclic ether to recover tetrahydrofuran monomer.
Abstract:
Included are elastic laminate articles that include multiple layers. This includes one stretch fabric comprising about 50% to 100% elastic fibers by weight of the fabric, including fabrics that include 100% elastic fibers and at least one adhesive.
Abstract:
The present invention relates to a composition comprising a polyester, a copolyester ether, and an oxidation catalyst, wherein the copolyester ether comprises a zinc compound and at least one polyether segment selected from the group consisting of poly(tetramethylene ether) and poly(tetramethylene-co-alkylene ether). The present invention further relates to articles made from the composition and methods to make the composition and the articles.
Abstract:
The invention relates to a method and apparatus for recovering power from the gaseous stream produced by an oxidation reaction. Specifically, the invention is based on heating the gaseous stream from the oxidation reaction to a temperature of at least 800 °C and recovering energy through a gas turbine. The compressor stage of the gas turbine compresses the oxidant feed to the reactor thereby at least partially offsetting the cost of providing the high temperature and pressure reaction conditions in the reactor. The invention also provides improved control of the power recovery system by optimising the efficiency of the gas turbine by feeding gas to the gaseous stream to modulate the flow of gas to the turbine relative to the compressor discharge flow in order to compensate for the consumption of oxidant in the reactor.
Abstract:
The invention relates to the field of separation by distillation of 6-aminocapronitrile (ACN) and hexamethylenediamine (HMD) from a mixture comprising ACN, HMD, tetrahydrozaepine (THA), adiponitrile (ADN) and low boilers (LB). A method for producing a distillate stream comprising HMD is disclosed, which is suitable for the production of Nylon-6,6. The tails stream from the distillation of the mixture can be further distilled to produce a distillate comprising ACN and THA, which is particularly suitable for use in the production of caprolactam and Nylon-6 from the caprolactam. Process conditions of the method of the invention disfavor the production of 2-cyanacyclopentylideneimine (CPI).
Abstract:
Highly crimped, fully drawn bicomponent fibers, prepared by melt-spinning, followed by gas-flow quenching, heat treatment and high speed windup, are provided, as are fine-decitex and highly uniform polyester bicomponent fibers.
Abstract:
Stable aqueous poly(urea/urethane) polymers and dispersions are made that do not require the inclusion of chain extenders, curing agents or crosslinking agents.
Abstract:
Included are multiple component elastic fibers prepared by a solution-spinning process such as dry spinning or wet spinner of spandex fibers including polyurethaneurea and polyurethane compositions. These fibers have a cross-section including at least two separate regions with definable boundaries wherein at least one region defined by the boundaries of the cross-section includes a polyurethaneurea or polyurethane composition. One region of the fiber includes a fusibility improvement additive to enhance adhesion to itself or to a substrate.