Abstract: Epoxy compositions that exhibit low viscosity in the uncured state and low coefficient of thermal expansion in the cured state are provided. The compositions are well-suited for use as dielectrics in electronics applications such as in multi-layer printed circuit boards, integrated circuit (IC) chip substrates, also known as IC chip carriers, and IC chip package interposers.

Abstract: Provided according to the invention are cross-linked polymers comprising an anhydride or partially hydrolyzed anhydride functionalized polymer having oligomeric polyimide cross-links, providing a polymeric composite on a molecular scale, and shaped articles made therefrom. In some embodiments the shaped articles are particularly well suited for electronics applications. The shaped articles are characterized by low CTE (coefficient of thermal expansion), low dielectric constant (Dk), low dissipation factor (Df), high strength, high modulus and high toughness.

Abstract: Cross-linked polymers comprising an anhydride or partially hydrolyzed anhydride functionalized polymer having oligomeric polyamic acid cross-links are provided. In solution, a polymer of the invention forms a formable gel. The formable gel is useful for forming shaped articles that are useful for electronics applications.