摘要:
Improved thermoplastic compositions that are resistant to die beard growth are described herein, comprising poly(phenylene ether) resins, polyamide resins and an amount of a beard growth reducing agent selected from the group consisting of non-elastomeric polyolefin resins, partially fluorinated polyolefins, and mixtures of non-elastomeric polyolefin resins and partially fluorinated polyolefins, effective for inhibiting beard growth. The compositions may further comprise at least one impact modifier, flow promotor or filler.
摘要:
Polymer blend compositions comprise (a) a polyphenylene ether polymer, (b) a polyphthalamide comprising the reaction product of (i) hexamethylene diamine or a mixture of hexamethylene diamine and trimethylhexamethylene diamine, and (ii) terephthalic acid, and optionally (iii) at least one acid selected from the group consisting of isophthalic acid and adipic acid, provided that a mixture of said diamines is employed if reactant (iii) is absent, and (c) at least one compatibilizer. The compositions may further include an aliphatic polyamide and/or an impact modifier.
摘要:
This invention provides a method for preparing polycarbonates, which utilizes polycondensation catalysts which are derivatized pyridyl triazinyl pyridyl macromolecules with the general formula Ax+y[(Triazinyl-Pyridyl)By−x], where A is certain alkali metals, B contains a charge balancing sulfonate, carboxylate, or phosphonate group. We have found that this new class of catalysts provide excellent polymerization rates for the preparation of Bisphenol A polycarbonate from the melt polymerization of diphenyl carbonate and Bisphenol A. Moreover, the catalysts of the invention were found to be very selective in substantially reducing the level of branching side reaction, i.e., formation of Fries product, normally associated with the melt polycarbonate process.
摘要翻译:本发明提供一种制备聚碳酸酯的方法,该方法采用衍生化的具有通式Ax + y [(三嗪基 - 吡啶基)By-x]的吡啶基三嗪基吡啶基大分子的缩聚催化剂,其中A是某些碱金属,B含有电荷平衡 磺酸盐,羧酸盐或膦酸盐基团。 我们已经发现,这种新类型的催化剂从碳酸二苯酯和双酚A的熔融聚合制备双酚A聚碳酸酯提供了极好的聚合速率。此外,发现本发明的催化剂在显着降低 分支侧反应,即通常与熔融聚碳酸酯方法相关的Fries产物的形成。
摘要:
Disclosed herein are agents, methods, and kits for determining the presence or concentration of a target, or multiple targets, in a sample, in a uniplexed or multiplexed fashion. In general, the methods enable the analysis of small molecules produced or consumed in liquid-phase that may be analyzed using gas or vapor phase detection methods.
摘要:
The present invention is directed to a method for the rapid screening of potential reactants, catalysts, and associated process conditions. In an embodiment, the invention comprises a method for evaluating catalyst efficacy in polymerization reactions by the determination of product molecular weight and Fries products.
摘要:
The present invention relates to a synthetic method in which one or more diaryl carbonates is reacted with one or more dihydroxy aromatic compounds in the presence of a transesterification catalyst under melt polymerization conditions to afford a product polycarbonate. The transesterifcation catalysts used according to the method of the present invention are alkali metal salts and alkaline earth metal salts of organic phosphates in combination with tetraalkylammonium or tetraalkylphosphonium compounds which serve as co-catalysts. The organic phosphate derivative adenosine 5′-monophosphate disodium salt was shown to possess excellent activity as a transesterifcation catalyst for the preparation of polycarbonate under melt polymerization conditions. The catalysts employed according to the method of the present invention provide polycarbonates having substantial molecular weight (Mn˜8000-10000 daltons) and reduced levels of Fries rearrangement product relative to conventionally prepared melt polycarbonate having a similar molecular weight.
摘要:
An article includes a substrate assembly for use in a detector system. The substrate assembly includes a substrate; a sample reception structure secured to the substrate; a test window extending through the substrate; and a fluid channel defined by a surface of the substrate and extending from the sample reception structure to the test window.
摘要:
A method comprises (A) defining a first experimental space comprising factors of at least two mixtures with at least one common factor, (B) defining a second experimental space by deleting duplicate factor combinations from the first experimental space and (C) conducting an experiment on the second experimental space. A system comprises a processor that (A) defines a first experimental space comprising factors of at least two mixtures with at least one common factor and (B) defines a second experimental space by deleting duplicate factor combinations from the first experimental space. The system also comprises a reactor and evaluator to select a best case set of factors from the second experimental space by a combinatorial high throughput screening (CHTS) method to select a best case set of factors from the second experimental space.
摘要:
This invention provides a method for preparing polycarbonates, which utilizes polycondensation catalysts which are salts of certain phenanthroline compounds. We have found that this new class of catalysts provide excellent polymerization rates for the preparation of Bisphenol A polycarbonate from the melt polymerization of diphenyl carbonate and Bisphenol A. Moreover, the catalysts of the invention were found to be very selective in substantially reducing the level of branching side reaction, i.e., formation of Fries product, normally associated with the melt polycarbonate process.
摘要:
This invention provides a method for preparing polycarbonates, which utilizes polycondensation catalysts which are salts of macrocyclic polypyrroles with the general formula Ax+y[(Porphine−Tm)By−x] or Ax+y[(Phthalocyanine−Tm)By−x], where A is certain alkali metals, B contains a charge balancing sulfonate, carboxylate, or phosphonate group and Tm is a transition metal are useful as polycarbonate melt polymerization catalysts. We have found that this new class of catalysts provide excellent polymerization rates for the preparation of Bisphenol A polycarbonate from the melt polymerization of diphenyl carbonate and Bisphenol A. Moreover, the catalysts of the invention were found to be very selective in substantially reducing the level of branching side reaction, i.e., formation of Fries product, normally associated with the melt polycarbonate process.
摘要翻译:本发明提供一种制备聚碳酸酯的方法,该方法利用作为通式Ax + y [(Porphine-Tm)By-x]或Ax + y [(酞菁-Tm)By-x]的大环聚吡咯的盐的缩聚催化剂, 其中A是一定的碱金属,B含有电荷平衡磺酸盐,羧酸盐或膦酸盐基团,Tm是过渡金属,可用作聚碳酸酯熔融聚合催化剂。 我们已经发现,这种新类型的催化剂从碳酸二苯酯和双酚A的熔融聚合制备双酚A聚碳酸酯提供了极好的聚合速率。此外,发现本发明的催化剂在显着降低 分支侧反应,即通常与熔融聚碳酸酯方法相关的Fries产物的形成。