Abstract:
A copoly(arylene sulfide) corresponding to the structure[(--A--S--).sub.1-x (--A--S--S--).sub.x ].sub.nwherein x is in the range of 0.5 to 0.001 prepared by reacting a mixture of a diiodoaromatic compound and elemental sulfur.
Abstract:
A process for iodinating an aromatic compound in which a source of iodine is reacted with the aromatic compound in the presence of oxygen over a non-acid catalyst wherein the aromatic compound has a fluoro, chloro, bromo, iodo, hydroxy or cyano group.
Abstract:
This invention relates to a novel carbonylation process for the production of aromatic carboxylic acids or esters of aromatic. More particularly, this invention relates to a process for the carbonylation of aromatic iodides or bromides with carbon monoxide in the presence of a palladium catalyst promoted with a Group VIB carbonyl and in the presence of an alcohol or water in a base reaction medium having a pKa greater than about 8. When the alcohol is used the product is the ester. When water is used the product is the carboxylic acid.
Abstract:
The present invention provides a process whereby by-product isophthalic acid is easily removed from terephthalic acid. The process thus provides a terephthalic acid product of improved purity. The process involves cooling at least a portion of a hot acetic acid production stream from which precipitated terephthalic acid has been removed so as to precipitate at least a portion of the isophthalic acid dissolved therein. The precipitated isophthalic acid is then removed and the production stream is recycled to a reactor from the production of terephthalic acid. The total production stream is thereby rendered unsaturated in isophthalic acid. Following the reaction in the terephthalic acid reactor, pure terephthalic acid in the substantial absence of isophthalic acid is recovered from the production stream as a precipitate. In a preferred embodiment, the cooling step involves cooling about 15 to 75%, and, at times, perhaps up to 100%, of the total hot acetic acid production stream to a temperature below about 50.degree. C.
Abstract:
A polymer additive for improving the reheat characteristics of a polymer or polymeric composition comprises an inorganic material which is such that a 2.5 mm thick polyethylene terephthalate plaque incorporating the inorganic material has, when tested, an absorption ratio of less than 0.9, wherein the absorption ratio is either the ratio of A1/A2 or the ratio A1/A3, wherein: A1 is the maximum absorption between 400 nm and 550 nm; A2 is the maximum absorption between 700 to 1100 nm; A3 is the maximum absorption between 700 to 1600 nm. Preferred inorganic materials are titanium nitride, indium tin oxide and lanthanum hexaboride.
Abstract:
Polymer compositions, for example of polyethyleneterephthalate bottles or preforms, include a reheat additive which has reducing transmission/increasing absorbance across the IR region as the wavelength increases. The reheat additive may be a titanium nitride, made by a plasma vapor deposition technique. Advantageously, the material may be used at a lower level than hitherto known materials or may be used at the same levels as hitherto but provide a greater reheat effect. Example 3a shown in the figure illustrates the absorbance of a preferred material.
Abstract:
A polymer additive for improving the reheat characteristics of a polymer or polymeric composition comprises an inorganic material which is such that a 2.5 mm thick polyethylene terephthalate plaque incorporating the inorganic material has, when tested, an absorption ratio of less than 0.9, wherein the absorption ratio is either the ratio of A1/A2 or the ratio A1/A3, wherein: A1 is the maximum absorption between 400 nm and 550 nm; A2 is the maximum absorption between 700 to 1100 nm; A3 is the maximum absorption between 700 to 1600 nm. Preferred inorganic materials are titanium nitride, indium tin oxide and lanthanum hexaboride.
Abstract:
Methods to decrease aldehyde content of a polymer are provided. An effective amount of an additive that contains a P—H functionality is incorporated into the polymer in the presence of an acidic of basic catalyst compositions are also provided.
Abstract:
A method to decrease an aldehyde content of a polyester. The method comprises incorporating an effective amount of an additive that is capable of catalyzing a hydride-transfer reaction between an organic donor molecule and an aldehyde in the polyester.
Abstract:
A container is made from a preform comprising a PET Copolymer comprising a diol component having repeat units from ethylene glycol and a non-ethylene glycol diol component and a diacid component having repeat units from terephthalic acid and a non-terephthalic acid diacid component. The total amount of non-ethylene glycol diol component and non-terephthalic acid diacid component is present in the poly(ethylene terephthalate) copolymer in an amount from about 0.2 mole percent to less than 2.2 mole percent. The container is useful in packaging beverages and corresponding methods are disclosed.