在正辛烷和正癸醇、正辛烷和正己酸以及正辛烷和 2 -乙基己基乙酰胺。这些实验提供了对这些系统中溶剂自缔合和溶剂-溶质相互作用之间竞争的深入了解。三种极性溶剂的溶剂化性质彼此大不相同,并且与不自缔合的极性溶剂大不相同。羧酸在浓缩溶液中形成二聚体(在烷烃中 >1 mM)。羧酸二聚体具有暴露的氢键受体位点,该位点溶剂化氢键供体溶质,与羧酸单体具有相似的结合亲和力。羧酸 H 键供体位点在二聚体中是不可接近的,并且不可用于溶剂化 H 键受体溶质。结果是 H 键受体溶质的溶剂化与溶剂二聚化竞争,而 H 键供体溶质的溶剂化则不然。仲酰胺在浓缩溶液中形成线性聚合物(在烷烃中 >10 mM)。仲酰胺聚集体的溶剂化特性与羧酸二聚体的溶剂化特性相似。H 键受体溶质的溶剂化必须与溶剂自缔合竞争,因为酰胺 H 键供体位点在聚合物聚集体的中间是不可接近的。然而,酰胺聚集体具有暴露的 H 键受体位点,其溶剂化 H 键供
Aldimines of Formula (I), which can be used as latent curing agents in curing compositions, for example, in moisture-curing polyurethane compositions that have isocyanate groups. The aldimines are compounds that can be liquid at room temperature, can have a hardly noticeable aldehyde odor before, during and after hydrolysis, and can have a long shelf life. An aldehyde in polyurethane compositions that is released during hydrolysis has only a slight softening effect and can exhibit very little tendency to migrate or exude.
Additives for improving tire cord adhesion and toughness of vulcanized rubber compositions
申请人:CYTEC TECHNOLOGY CORP.
公开号:EP0473948A2
公开(公告)日:1992-03-11
New additives in rubber compositions improve tire cord adhesion without need to use resorcinol. The new additives are derivatives of melamine, aceto guanamine, benzoguanamine, cyclohexylguanamine, and glycoluril, substituted with at least two vinyl-terminated radicals. Preferred compounds may also be substituted with at least one radical having a carbamylmethyl group.
Die vorliegende Erfindung betrifft neuartige Amine mit sekundären Aminogruppen, ein Verfahren zu deren Herstellung, Addukte dieser Amine und deren Verwendungen. Die Amine lassen sich auf einfache Art und Weise aus leicht zugänglichen Edukten herstellen. Sie und ihre Addukte zeichnen sich insbesondere durch eine niedrige Viskosität aus und sind geeignet als Bestandteil von Polyurethan- und Polyharnstoff-Zusammensetzungen mit ausgezeichneter Verarbeitbarkeit und hoher Flexibilität, sowie als Bestandteil von Epoxidharz-Zusammensetzungen, insbesondere Beschichtungen.
Near-infrared-absorbing dye, optical filter, and imaging device
申请人:AGC Inc.
公开号:US11059977B2
公开(公告)日:2021-07-13
Provided is a near-infrared-absorbing dye increasing a visible light transmittance and having a near-infrared blocking characteristic. The near-infrared-absorbing dye has an absorption characteristic measured by dissolving the dye in dichloromethane satisfying the following requirements. ⋅In an absorption spectrum at a wavelength of 400 to 800 nm, there is a maximum absorption wavelength λmax in a wavelength region of 670 nm or more. ⋅The following relational expression is established between a maximum absorption constant εA with respect to light with a wavelength of 430 to 550 nm and a maximum absorption constant εB with respect to light with a wavelength of 670 nm or more, where εB/εA≥65. ⋅In a spectral transmittance curve, an average transmittance of light with a wavelength of 430 to 460 nm is 94.0% or more when a transmittance at the maximum absorption wavelength λmax is set to 1%.