Polyimide composition
AssigneeDexter-Hysol Aerospace, Inc.
InventorsManette M. Gebhardt, Yesh P. Sachdeva
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Abstract
A composition that includes a finely divided, fully imidized, polyimide dispersed in a non-volatile, fluidizing resin that is a liquid or low viscosity semi-solid at room temperature. The fluidizing resin is substantially insoluble in the polyimide at room temperature, but soluble in the polyimide at the elevated temperatures during thermal processing. The composition has the flow characteristics of a highly filled liquid. The composition if useful, e.g., as an adhesive.
Claims23
A composition comprising a finely divided, fully imidized, thermosetting polyimide dispersed in a non-volatile, fluidizing resin which is a liquid or low viscosity semi-solid at room temperature and substantially insoluble in the thermosetting polyimide at room temperature but soluble in the thermosetting polyimide at the elevated temperatures used during thermal processing,
- said fluidizing resin being present in an amount sufficient to impart to said composition the flow characteristics of a highly filled liquid.
A thermally processed adhesive composition comprising a finely divided, fully imidized polyimide dispersed in a non-volatile, fluidizing resin which is a liquid or low viscosity semi-solid at room temperature and substantially insoluble in the thermally processed polyimide.
A method of preparing a substantially void-free polyimide composition comprising the steps of
- dispersing a finely divided, fully imidized, thermosetting polyimide in a non-volatile, fluidizing resin which is a liquid or low viscosity semi-solid at room temperature and substantially insoluble in the thermosetting polyimide at room temperature but soluble in the thermosetting polyimide at the elevated temperatures used during thermal processing,
- said fluidizing resin being present in an amount sufficient to impart to said composition the flow characteristics of a highly filled liquid;
- forming the resulting dispersion into a shape;
- and
- thermally processing said composition at elevated temperatures.
Dependencies are inferred from the claim text.