Structural materials and components
First Claim
1. A process of making a blocking material or the like which comprises the steps of forming a polyimide precursor, blending glass microballoons with said precursor, and converting said precursor to a polyimide, said polyimide precursor containing three different primary diamines, one of said diamines being heterocyclic and having nitrogen in the ring, another of said diamines being a para- or meta-substituted aromatic diamine which is free of aliphatic moieties, the third of said diamines being aliphatic, and said precursor being prepared by dissolving the primary diamines and one or more tetracarboxylic acids or anhydrides thereof in essentially stoichiometric proportions in a lower alkyl alcohol or mixture of such alcohols.
2 Assignments
0 Petitions
Accused Products
Abstract
High density structural ("blocking") materials composed of a polyimide filled with glass microballoons. Structural components such as panels which have integral edgings and/or other parts made of the high density materials.
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Citations
20 Claims
- 1. A process of making a blocking material or the like which comprises the steps of forming a polyimide precursor, blending glass microballoons with said precursor, and converting said precursor to a polyimide, said polyimide precursor containing three different primary diamines, one of said diamines being heterocyclic and having nitrogen in the ring, another of said diamines being a para- or meta-substituted aromatic diamine which is free of aliphatic moieties, the third of said diamines being aliphatic, and said precursor being prepared by dissolving the primary diamines and one or more tetracarboxylic acids or anhydrides thereof in essentially stoichiometric proportions in a lower alkyl alcohol or mixture of such alcohols.
- 5. A process of making a blocking material or the like which comprises the steps of forming a polyimide precursor, blending glass microballoons with said precursor, and converting said precursor to a polyimide, said polyimide precursor containing two different primary diamines, one of said diamines being heterocyclic and having nitrogen in the ring and the other of said diamines being a para- or meta-substituted aromatic diamine which is free of aliphatic moieties, and said precursor being prepared by dissolving the primary diamines and one or more tetracarboxylic acids or anhydrides thereof in essentially stoichiometric proportions in a lower alkyl alcohol or mixture of such alcohols.
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8. 6-diamino toluene
2,4-diamino toluene.
Specification