Urea terminated butadiene polymers and butadiene acrylonitrile copolymers

A polybutadiene acrylonitrile and polymer technology, applied in the field of butadiene acrylonitrile copolymers, can solve the problems of accelerated curing reaction, lower glass transition temperature, no generation, etc.

Active Publication Date: 2020-04-10
HUNTSMAN ADVANCED MATERIALS AMERICAS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Dimethylamine-terminated urea provides a significant increase in impact strength, but with a significant reduction in the glass transition temperature of the cured formulation
The urea-terminated polybutadiene was proved to accelerate the curing reaction between epoxy resin and dicyandiamide, and mildly improve the toughness of epoxy resin, but disadvantageously, the glass transition temperature of the cured epoxy matrix very large reduction
Urea-terminated polybutadiene also has the known disadvantage that polybutadiene is incompatible with most epoxy resins and does not produce the proper phase-separated morphology for optimal improvement in toughness

Method used

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  • Urea terminated butadiene polymers and butadiene acrylonitrile copolymers
  • Urea terminated butadiene polymers and butadiene acrylonitrile copolymers
  • Urea terminated butadiene polymers and butadiene acrylonitrile copolymers

Examples

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Embodiment 1

[0047] Example 1 shows the use of 3000x914HTBN (Example 1 and Example 2) or 2800x95HTB (Example 3) Starting Material Synthesis of urea-terminated polymers of the invention using the general method described in this application. Table 1 reflects the variation of the reaction stoichiometry and the amount of starting material. The urea-terminated polymers of the present invention were prepared using various amounts (expressed as equivalents (moles of reactive groups)) of polymeric material, diisocyanate (NCO) and dimethylamine described below.

[0048] 500 g of the indicated polymeric material was weighed into a 3 necked round bottom flask equipped with mechanical stirring and vacuum distillation. The flask was heated to 100°C in an oil bath with stirring under vacuum and allowed to degas for a period of 1 hour before reducing the temperature to 45°C. After the oil bath reached 45°C, 300 g of xylene was added, and the reaction mixture was stirred for 20 minutes until homogen...

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Abstract

Urea-terminated polybutadiene polymers and polybutadiene acrylonitrile copolymers useful as both accelerators and tougheners are disclosed for use in epoxy formulations cured with dicyandiamide. The inventive urea-terminated polymers achieve comparable toughness in cured epoxy formulations when compared to that achieved with traditional polymeric or rubber tougheners with little to no change in glass transition temperature. Viscosity improvement and stability over time are also an advantage. A method of preparation emphasizing aspects of reaction stoichiometry is also disclosed.

Description

technical field [0001] The present invention relates to urea-terminated butadiene polymers (UTB) and urea-terminated butadieneacrylonitrile copolymers (UTBN) having novel and unexpected properties. The polymer of the present invention is used as both an accelerator and a toughening agent for latent heat curing epoxy formulations, and it is no longer necessary to use traditional urea accelerators or separate accelerators and toughening agents. Unexpectedly, when used in certain concentrations, the polymers had no or minimal effect on the glass transition temperature of the formulation. In addition, the latency of epoxy formulations comprising the polymers of the present invention was comparable to epoxy formulations comprising other commercially available ureas used as accelerators. Epoxy formulations comprising the urea-terminated polymers of the present invention have lower viscosities than formulations comprising conventional tougheners. Background technique [0002] Sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08F36/06C08G18/08
CPCC08F36/06C08F279/02C08G18/08C08F236/12C08C19/22C08C19/30C08L9/06C08G81/024C08L63/00C08F136/06C08G18/69C08G18/692C08L9/02C08L9/00
Inventor 杰里米·帕萨塔
Owner HUNTSMAN ADVANCED MATERIALS AMERICAS INC
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