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US 11,993,867 B2Granted
Spun ABPBI fibers and process for preparing the same
AssigneeGharda Chemicals Limited
InventorsPrakash D. Trivedi, Mathew Abraham, Amit Kundu
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Abstract
Spun ABPBI fibers and a process for the preparing spun ABPBI fibers using a high molecular weight ABPBI dope solution suitable for spinning are provided. A process for preparing the high molecular weight ABPBI dope solution suitable for spinning is also provided. The spun ABPBI fibers can be used in the preparation of high temperature thermally resistant articles.
Claims17
Spun ABPBI fibers, wherein the spun ABPBI fibers have the following properties:
- a. filaments in the range of 1.5 denier 12.0 denier;
- b. tenacity in the range of 2.5 grams per denier to 4.0 grams per denier;
- c. break strength in the range of 4.0 gmf to 15 gmf;
- and
- d. elongation at break in the range of 15-25%.
2 more elements
A process for preparing poly(2,5-benzimidazole) (ABPBI) suitable for spinning, said process comprising the following steps:
- i. polymerizing 3,4-diaminobenzoic acid (DABA) having purity >99.5% in Methane Sulfonic acid (MSA) at a temperature in the range of 150° C. to 200° C. at a pressure in the range of 0.5 to 10 mm Hg for a time period in the range of 3 hours to 6 hours under inert atmosphere to obtain a reaction mixture;
- and
- ii. adding P2O5 in the range of 0.05 to 0.3 moles per mole of DABA to said reaction mixture at a temperature in the range of 150° C. to 200° C. for a time period in the range of 3 hours to 6 hours under inert atmosphere to obtain ABPBI suitable for spinning.
Dependencies are inferred from the claim text.