Glass bubble filled polybenzimidazole

• US 5,308,909 A
• Filed: 02/19/1993
• Issued: 05/03/1994
• Est. Priority Date: 06/12/1991
• Status: Expired due to Fees

• Current Assignee: Hoechst Celanese Corporation (Sanofi )
• Original Assignee: Hoechst Celanese Corporation (Sanofi )
• Inventors: Hughes, O. Richard, Astone, Victor C., Chen, Paul N. Sr., Cooper, William M.
• Primary Examiner(s): SANDERS, KRIELLION ANTIONETTE
• Application Number:
  US08/019,960
• Time in Patent Office: 438 Days
• Field of Search: 524/494, 523/219
• US Class Current: 524/494
• CPC Class Codes: C08J 2379/04 Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: C08J 3/212 and solid additives

Abstract

A moldable hollow glass filled PBI composition. The composition may be prepared by making a well-mixed slurry of glass microspheres in a solution of PBI in a suitable solvent, and then spinning the slurry through a jet or die under pressure and into a water bath where the particles coagulate. The solvent dissolves in the water, allowing solvent-free PBI-glass composite particles to be isolated.

Claims

1. A moldable composition comprising polybenzimidazole and glass bubbles, said glass bubbles comprising at least about 10% by volume of said composition.

2. A moldable composition according to claim 1 wherein said polybenzimidazole comprises poly[2,2,-(m-phenylene)-5,5,-bibenzimidazole].

3. A moldable composition according to claim 1 wherein said glass bubbles comprise about 20-50% by volume of said composition.

4. A moldable composition according to claim 1 wherein said glass bubbles have an average density of approximately 0.3-0.6 g/cm³.

12. A molded article comprising the composition of claim 1.

5. A moldable composition consisting essentially of polybenzimidazole and glass bubbles, wherein at least about 10% by volume of said composition consists of said glass bubbles.

6. A moldable composition according to claim 5 wherein said polybenzimidazole comprises poly[2,2'"'"'-(m-phenylene)-5,5'"'"'-bibenzimidazole].

7. A moldable composition according to claim 5 wherein about 20-50% by volume of said composition consists of said glass bubbles.

8. A moldable composition according to claim 7 wherein said polybenzimidazole is poly[2,2,-(m-phenylene)-5,5'"'"'-bibenzimidazole].

9. A moldable composition comprising poly[2,2'"'"'-(m-phenylene)-5,5'"'"'-bibenzimidazole] and about 10-70% by volume glass bubbles.

10. A moldable composition according to claim 9 wherein said glass bubbles have an average diameter of about 30-50 microns and an average density of about 0.3-0.6 g/cm³.

11. A molded article comprising the composition of claim 10.