Polyimide adhesive and method of making from lactam, dianhydride

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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4284735, 524600, 524611, 528170, 528179, 528182, 528187, 528222, 528223, 528224, 528229, 528312, 528313, 528315, 528323, 528324, C08G 6914

Patent

active

046580107

ABSTRACT:
Methods of making modified polyimide adhesives and laminating compositions. These adhesives are also particularly useful as the matrix material in high strength fiber reinforced composites. The adhesive compositions are prepared by initially reacting an oxoimine with one or more tetracarboxylic acid dianhydrides, which is primarily 1, 2, 3, 4-butanetetracarboxylic acid dianhydride. The resulting bisimide is dissolved in a non-reactive solvent and a suitable diamine is added to react with the bisimide, producing a liquid resin solution which is essentially a polyamide resin solution. This solution is useful as an adhesive or a fiber composite matrix which can be cured to a polyimide at moderate processing temperatures. The final adhesive bond or matrix is found to be flexible, strong and very resistant to flame, high temperatures, oils and solvents.

REFERENCES:
patent: 3310506 (1967-03-01), Amborski et al.
patent: 4183839 (1980-01-01), Gagliani
patent: 4600770 (1986-07-01), Gagliani et al.

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