Catalysis of polyimide curing

C - Chemistry – Metallurgy – 08 – G

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C08G 73/10 (2006.01) C08L 79/08 (2006.01) C09D 179/08 (2006.01)

Patent

CA 2641461

Polyimide oligomers and polymers are cured with the assistance of a phosphorus based catalyst, such as an aryl, alkyl or arylalkyl phosphite. The resulting material has the desirable high thermal properties of condensation polyimides, but with minimal outgassing of water during cure. Novel properties obtained include an increase in glass transition, crosslink density, lower temperature cure, and improved film formation. These properties are important in applications including solvent based coatings, films, powder coatings, pre- impregnated (prepreg) coatings, laminates, compression molding, and thermosetting resin extrusions.

Des oligomères et polymères de type polyimides sont durcis à l'aide d'un catalyseur à base de phosphore, tel qu'un phosphite d'aryle, d'alkyle ou d'arylalkyle. La matière résultante a les propriétés thermiques élevées souhaitables des polyimides formés par condensation, mais avec un dégazage minimal d'eau au cours du durcissement. Les nouvelles propriétés obtenues comprennent une augmentation de la température de transition vitreuse, de la densité de réticulation, une plus faible température de durcissement et une meilleure formation d'un film. Ces propriétés sont importantes dans des applications comprenant des revêtements à base de solvants, des films, des revêtements en poudre, des revêtements de préimprégnés, des stratifiés, des moulages par compression et des extrusions de résines thermodurcissables.

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