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BISMALEIMIDE AND CYANATE POLYMERS WITH IMPROVED RESISTANCE TO DEGRADATION BY WATER

IP.com Disclosure Number: IPCOM000239164D
Publication Date: 2014-Oct-17

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention is a hindered thermosetting bismaleimide and a hindered cyanate resin composition. The compositions with hindered bismaleimide monomer may include substantially aromatic alkenyl bismaleimide comonomers. The hindered thermosetting resin compositions when cured into parts are characterized by reduced degradation in severe water environments especially at high pH or high temperature as measured by comparison to standard thermosetting bismaleimide or cyanate resin compositions without hindered bismaleimide monomers or hindered cyanate monomers. The alkenyl bismaleimide comonomers are preferably selected so that they function with the hindered bismaleimide monomer or hindered cyanate esters monomers to provide additional resistance to water degradation. These hindered thermosetting resin compositions are suitable to make adhesives, resins, and prepregs for cured fiber reinforced composites and other parts with reduced susceptibility to degradation in severe water environments.

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BISMALEIMIDE AND CYANATE POLYMERS WITH IMPROVED RESISTANCE TO DEGRADATION BY WATER

ABSTRACT

The present invention is a hindered thermosetting bismaleimide and a hindered cyanate resin composition. The compositions with hindered bismaleimide monomer may include substantially aromatic alkenyl bismaleimide comonomers. The hindered thermosetting resin compositions when cured into parts are characterized by reduced degradation in severe water environments especially at high pH or high temperature as measured by comparison to standard thermosetting bismaleimide or cyanate resin compositions without hindered bismaleimide monomers or hindered cyanate monomers. The alkenyl bismaleimide comonomers are preferably selected so that they function with the hindered bismaleimide monomer or hindered cyanate esters monomers to provide additional resistance to water degradation. These hindered thermosetting resin compositions are suitable to make adhesives, resins, and prepregs for cured fiber reinforced composites and other parts with reduced susceptibility to degradation in severe water environments.

FIELD OF THE INVENTION


[0001] The present invention relates to bismaleimide and cyanate ester thermosetting resin compositions having hindered bismaleimide monomers combined with alkenyl bismaleimide comonomers; hindered cyanate monomers; or combinations of both optionally combined with an alkenyl bismaleimide comonomer for use in high performance composite, adhesive and resin applications requiring high temperature use with improved resistance to degradation by water in severe environments.

BACKGROUND


[0002] Fiber reinforced, polymer matrix composites (PMCs) are widely used in a number of applications and increasing amounts of PMCs are being used in severe environments. Most

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PMCs applications use epoxy resins because of epoxy's good combination of mechanical properties, wide service temperature range, and ease of part manufacture. However, some composite applications require higher thermal durability (higher Tg or oxidation resistance at elevated temperature) of the finished composite than traditional epoxies can provide. Epoxy PMCs cannot be used in high temperature applications, above about 180°C, because they lack adequate Tg or they can be oxidized by oxygen in the air.


[0003] One PMC resin developed to provide higher thermal durability is PMR-15, which has a Tg greater than 300°C. However, PMR-15 has severe limitations due to micro-cracks, processing difficulty, and that it contains 4, 4'-methylenedianiline, MDA, a health hazard requiring extensive environmental controls. A further limitation is that PRM-15 does not possess adequate resistance to water degradation. Consequently, PMR-15 is not widely used and extensive work since the development of PMR-15 has not identified an adequate replacement.


[0004] Other PMC resins developed to provide higher thermal durability beyond the capability of epoxy resins are bismaleimide and...