Single-step-processable polyimides

Details Single-step-processable polyimides Single-step-processable polyimides

2007-06-22

2010-11-02

Choi, Ling-Siu (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S170000, C528S183000, C528S188000, C528S310000, C528S335000, C564S306000, C564S431000, C564S432000, C564S433000, C564S434000, C558S424000, C525S432000

Reexamination Certificate

active

07825211

ABSTRACT:
A process for synthesizing formulations for polyimides suitable for use in high-temperature composites in which all reactions other than chain-extension have already taken place prior to making a composite is described, wherein the resulting oligomers comprise a backbone and at least one difunctional endcap. The resulting resin systems have only the single step of endcap-to-endcap reactions during composite processing. Prior to the initiation temperature of these endcap-to-endcap reactions, the resins are stable affording the composite manufacturer a very large processing window.

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