초록 ▼

Melt-fusible polyimides based on pyromellitic dianhydride and 2,2-bis[3,5-dichloro-4-(4-aminophenoxy)phenyl]propane, alone or in combination with other defined diamines, are useful in making low-void composites and thermoplastic tapes, which can be fabricated into articles such as, for example, airc

Melt-fusible polyimides based on pyromellitic dianhydride and 2,2-bis[3,5-dichloro-4-(4-aminophenoxy)phenyl]propane, alone or in combination with other defined diamines, are useful in making low-void composites and thermoplastic tapes, which can be fabricated into articles such as, for example, aircraft and autobody panels, printed circuit boards, etc.

대표청구항 ▼

A melt-fusible polyimide consisting essentially of the following repeating units [Figure] where Q is each repeating unit, independently of any other unit, is a divalent organic radical selected from the following: [Figure] (a) where G is O or S, and Z is hydrogen or phenyl; and, when Z is hydrogen,

A melt-fusible polyimide consisting essentially of the following repeating units [Figure] where Q is each repeating unit, independently of any other unit, is a divalent organic radical selected from the following: [Figure] (a) where G is O or S, and Z is hydrogen or phenyl; and, when Z is hydrogen, both terminal covalent bonds are either in the ortho or meta position with respect to G; while, when Z is phenyl, both terminal covalent bonds are in ortho, meta, or para position with respect to G; [Figure] (b) where G is O or S; and R is phenyl, biphenyl, or naphthyl; [Figure] (c) where G is O or S and both terminal covalent bonds are in the ortho or meta position with respect to G; and [Figure] (d) with the proviso that Q in at least some of the repeating units has the above formula (d). A substantially void-free composite structure consisting essentially of a fibrous substrate impregnated with a melt-fusible polyimide containing up to about 10% of end-capped amino or anhydride groups and consisting essentially of the following repeating units: [Figure] where Q in each repeating unit, independently of any other unit, is a divalent organic radical selected from the following: [Figure] (a) where G is O or S; and Z is hydrogen or phenyl; and, when Z is hydrogen, both terminal covalent bonds are either in the ortho or meta position with respect to G; while, when Z is phenyl, both terminal covalent bonds are in ortho, meta, or para position with respect to G; [Figure] (b) where G is O or S; and R is phenyl, biphenyl, or naphthyl; [Figure] (c) Where G is O or S; and [Figure] (d) with the proviso that Q in at least some of the repeating units has the above formula (d).