Macrocyclic carbodiimides (MC-CDI) and their derivatives, syntheses and applications of the same
申请人:Dai Shenghong A.
公开号:US20080161554A1
公开(公告)日:2008-07-03
Disclosed are a macrocyclic carbodiimide (MC-CDI) and a process for synthesizing the same through condensation of a molecule with multiple-isocyanate terminal functional groups under high dilution in the presence of a phospholene catalyst such as phospholene or arsenic catalyst. Also disclosed are MC-CDI derivatives, such as MC-urea (MC-U), MC-acylurea (MC-ACU), acid functionalized MC-ACU, and anhydride functionalized MC-ACU, processes for synthesizing the same, and the applications of such derivatives as hydrolysis stabilizers in organic polymeric materials, such as polyurethane (PU) and polyesters, as well as the applications in the syntheses of the amide- and imide-modified polyurethane by ring-opening reaction of the MC-ACU.
Continous solvent-free process for thermoplastic polyamides and polyester amides
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0104381A2
公开(公告)日:1984-04-04
A continuous, solvent-free process is described for the preparation of thermoplastic polyamides and polyesteramides by the reaction of the appropriate organic diisocyanate and dicarboxylic acid or difunctional carboxylic acid-terminated polyester.
Blends of aromatic-aliphatic polyamides and impact modifiers
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0154037A2
公开(公告)日:1985-09-11
Blends are provided of (a) certain aromatic-aliphatic polyamides and (b) an impact resistance-enhancing amount of a particulate rubbery impact modifier.
混合物包括:(a) 某些芳香-脂肪族聚酰胺;(b) 抗冲击性增强型微粒橡胶抗冲击改性剂。
Polyamide resins with good toughness
申请人:THE DOW CHEMICAL COMPANY
公开号:EP0355718A1
公开(公告)日:1990-02-28
Disclosed is a novel class of linear segmented non-elastomeric thermoplastic polyesteramides. The polymers are easily obtained by reacting a carboxylic acid-terminated prepolymer (derived by reacting at least a two-molar proportion of a dicarboxylic acid with a polymeric diol of molecular weight 400 to 6000) with a dicarboxylic acid and a diisocyanate.
The polymers so obtained have nylon-like properties, particularly nylon 11 or 12, but are distinguished from these nylons by superior high temperature properties. At the same time, they have excellent toughness and low water absorption characteristics.
LIGHT COLOR MODIFIED ISOCYANATE MIXTURE AND PREPARATION METHOD THEREFOR
申请人:Wanhua Chemical Group Co., Ltd.
公开号:EP3699169A1
公开(公告)日:2020-08-26
Disclosed is a light colored modified isocyanate mixture and a preparation method thereof. The method comprises the following steps: a) reacting isocyanate groups of a raw material isocyanate under the action of a phospholenecatalyst, and finally obtaining a modified isocyanate reaction solution containing carbodiimide and/or uretonimine derivatives; and b) adding a compounded terminator of a halosilane organic and a sulfonic anhydride to the reaction solution obtained in step a so as to terminate the reaction of carbodiimidization. The modified isocyanate prepared by the method has the characteristics of a liquid state at room temperature, being stable in storage at room temperature and high temperature, and low color number.
本发明公开了一种浅色改性异氰酸酯混合物及其制备方法。该方法包括以下步骤:a) 在磷烯催化剂的作用下,使原料异氰酸酯的异氰酸酯基团发生反应,最终得到含有碳二亚胺和/或脲亚胺衍生物的改性异氰酸酯反应液;b) 在步骤 a 中得到的反应液中加入卤代硅烷有机物和磺酸酐的复合终止剂,以终止碳二亚胺化反应。该方法制备的改性异氰酸酯具有室温下呈液态、在室温和高温下储存稳定、色号低等特点。