Bismaleimide Compound for High-Tg Insulating Materials

The patent applies local quality by introducing a cyclohexane backbone structure at specific positions within the bismaleimide molecule. This localized structural modification provides polar groups that enhance compatibility with other resins while maintaining the low dielectric properties achieved through long-chain alkyl groups, thus resolving the contradiction between dielectric performance and compositional stability.

The patent creates a composite molecular structure combining polar cyclohexane backbone segments with non-polar long-chain alkyl segments within the same bismaleimide molecule. This molecular-level composite structure enables simultaneous achievement of low dielectric properties (from alkyl groups) and good compatibility (from cyclohexane backbone), preventing curing unevenness and resin aggregation.

The patent uses local quality by placing polar cyclohexane backbone structures at specific locations within the molecule to enhance thermal stability and Tg, while maintaining low dielectric properties through separately positioned long-chain alkyl groups. This spatial differentiation allows independent optimization of thermal and dielectric properties.

The patent applies parameter changes by carefully controlling the length and structure of alkyl chains (6-200 carbon atoms) and the configuration of cyclohexane backbones to achieve the optimal balance between Tg and dielectric properties, enabling simultaneous satisfaction of both thermal stability and low dielectric constant requirements.

The patent prevents agglomeration by introducing polar cyclohexane backbone structures at localized positions within the bismaleimide molecules. These polar groups create favorable interactions with other resins in the composition, maintaining molecular dispersion and preventing aggregation even when using long-chain alkyl groups for high Tg achievement.

The cyclohowane backbone acts as an intermediary structure that mediates between the non-polar long-chain alkyl groups and the polar curing agents or other resins in the composition. This intermediary polar structure prevents phase separation and maintains homogeneous mixing, enabling successful curing without aggregation.

The patent creates a composite material system combining bismaleimide resin with curing agents, where the bismaleimide component provides both mechanical strength and low dielectric properties. The cyclohexane backbone structure enhances intermolecular interactions for mechanical integrity while the long-chain alkyl groups maintain low dielectric constant, achieving dual performance improvement.

The patent achieves both mechanical strength and good dielectric properties by optimizing the molecular structure parameters of the bismaleimide resin, including the cyclohowane backbone configuration and alkyl chain length, along with selecting appropriate curing agents and formulations, thereby breaking the trade-off between mechanical and dielectric performance.