摘要:
A method for preparing a poly(arylene ether) with a reduced level of powder fines is described. In one embodiment, the method comprises oxidatively coupling a monohydric phenol in the presence of a solvent and a complex metal catalyst, to produce a poly(arylene ether) resin; and then removing a portion of the solvent to produce a concentrated solution having a cloud point Tcloud. The concentrated solution is then combined with an anti-solvent to precipitate the poly(arylene ether) in the form of a precipitation mixture. The concentrated solution usually has a temperature of at least about (Tcloud−10° C.) immediately before it is combined with the anti-solvent. The precipitation mixture has a temperature of at least about (Tcloud−40° C.) after its formation. Related poly(arylene ether) copolymers are also described.
摘要:
An alkylation method comprises reacting a hydroxy aromatic compound with an alkyl alcohol in the presence of an alkylation catalyst comprising a metal oxide wherein the alkylation catalyst, has a surface area to volume ratio of about 950 to about 4,000 m2/m3, an aspect ratio of about 0.7 to about 1.0 or a combination of the foregoing.
摘要翻译:烷基化方法包括在包含金属氧化物的烷基化催化剂存在下使羟基芳族化合物与烷基醇反应,其中烷基化催化剂的表面积与体积比为约950至约4000m 2 / > / m 3,长宽比为约0.7至约1.0或前述的组合。
摘要:
A curable composition includes an olefinically unsaturated monomer and a poly(arylene ether) having two polymerizable groups and an intrinsic viscosity of about 0.05 to about 0.30 deciliters per gram. The composition exhibits an improved combination of high flow during molding and high post-cure stiffness and impact strength. The composition is particularly useful for fabricating plastic-packaged electronic devices.
摘要:
A poly(arylene ether) produced by combining a poly(arylene ether) solution with an antisolvent at a shear rate of greater than 50,000 sec−1. The high shear mixing conditions produce a poly(arylene ether) dispersion in which the poly(arylene ether) solid contains reduced amounts of undesirably fine particles.
摘要:
A curable composition includes an olefinically unsaturated monomer and a poly(arylene ether) having two polymerizable groups and an intrinsic viscosity of about 0.05 to about 0.30 deciliters per gram. The composition exhibits an improved combination of high flow during molding and high post-cure stiffness and impact strength. The composition is particularly useful for fabricating plastic-packaged electronic devices.
摘要:
The invention relates to a novel process for the manufacture of very low molecular weight polyphenylene ether resin, typically within the intrinsic viscosity range of about 0.08 dl/g to about 0.16 dl/g as measured in chloroform at 25° C. The method preferably comprises 2,6-dimethylphenol as a monovalent phenol species. The invention also relates to the polyphenylene ether resin made by the process as well as blends and articles containing the polyphenylene ether resin made by the process.
摘要:
A method of making a carbonyl compound comprises contacting a compound comprising a secondary hydroxyl group with a basic metal oxide catalyst at a temperature sufficient to maintain the compound comprising a secondary hydroxyl group in a vapor phase.
摘要:
A method of making a carbonyl compound comprises contacting a compound comprising a secondary hydroxyl group with a basic metal oxide catalyst at a temperature sufficient to maintain the compound comprising a secondary hydroxyl group in a vapor phase.