Two-stage cure polyimide oligomers
AssigneeI.S.T. (MA) Corporation
InventorsGary Deets, Jianming Xiong
Life of this patent
Estimating the term…
Abstract
A method for using citraconic anhydride and itaconic anhydride as addition cure end caps in reactions for forming polyamic acid oligomers and polyimide oligomers, is provided. Prepregs and high temperature adhesives made from the resulting oligomers, as well as, high temperature, low void volume composites made from the prepregs, are also provided.
Claims21
A method for using citraconic anhydride and itaconic anhydride, the method comprising using citraconic anhydride and itaconic anhydride as addition cure end caps in reactions for forming polyamic acid oligomers and polyimide oligomers.
A polyamic acid oligomer, which is obtained by reacting one or more aromatic dianhydrides, one or more aromatic diamines, and one or more addition cure end caps selected from the group of citraconic anhydride and itaconic anhydride.
A solution comprising:
- (a) at least one of a polyamic acid oligomer and a polyimide oligomer;
- and (b) one or more organic solvents, wherein the polyamic acid oligomer is obtained by reacting one or more aromatic dianhydrides, one or more aromatic diamines, and one or more addition cure end caps selected from the group of citraconic anhydride and itaconic anhydride, and wherein the polyimide oligomer is a condensation product of the polyamic acid oligomer.
A high temperature, low void volume, fiber-reinforced composite material obtained by consolidating and curing a prepreg in which a fibrous reinforcing material is impregnated with a prepreg solution comprising:
- (a) at least one of a polyamic acid oligomer and a polyimide oligomer;
- and (b) one or more organic solvents, wherein the polyamic acid oligomer is obtained by reacting one or more aromatic dianhydrides, one or more aromatic diamines, and one or more addition cure end caps selected from the group of citraconic anhydride and itaconic anhydride, and wherein the polyimide oligomer is a condensation product of the polyamic acid oligomer.
An adhesive, which comprises:
- (a) at least one of a polyamic acid oligomer and a polyimide oligomer;
- and (b) one or more organic solvents, wherein the polyamic acid oligomer is obtained by reacting one or more aromatic dianhydrides, one or more aromatic diamines, and one or more addition cure end caps selected from the group of citraconic anhydride and itaconic anhydride, and wherein the polyimide oligomer is a condensation product of the polyamic acid oligomer.
Dependencies are inferred from the claim text.