Fasteners made of a polymer material
Fasteners, such as bolts, nuts and screws, rivets, pins, and retaining rings, made of a highly kinked rigid-rod polyarylene exhibiting outstanding characteristics, notably a high torque and a high tensile elongation, a measure of practical toughness.
1. A fastener (F) consisting of a polymer material (M) consisting of at least one kinked rigid-rod polyarylene (P) of which the recurring units are recurring units (R) of one or more formulae consisting of an optionally substituted arylene group, provided said optionally substituted arylene group is linked by each of its two ends to two other optionally substituted arylene groups via a direct C—C linkage, said recurring units (R) being a mix (M) consisting of:
between 0 and 75 mole %, based on the total number of moles of the recurring units (R), of rigid rod-forming arylene units (Ra), said rigid rod-forming arylene units (Ra) being optionally substituted by at least one monovalent substituting group,
with
between 25 and 100 mole %, based on the total number of moles of the recurring units (R), of kink-forming arylene units (Rb), said kink-forming arylene units (Rb) being optionally substituted by at least one monovalent substituting group.
2. The fastener according to claim 1 , wherein, in the mix (M), the number of moles of the kink-forming arylene units (Rb), based on the total number of moles of the recurring units (R), is of at least 40%.
3. The fastener according to claim 1 , wherein, in the mix (M), the number of moles of the kink-forming arylene units (Rb), based on the total number of moles of the recurring units (R), is of at most 65%.
4. The fastener according to claim 1 , wherein the recurring units (R) of the kinked rigid-rod polyarylene (P) are a mix (M) consisting of:
between 0 and 75 mole %, based on the total number of moles of recurring units (R), of rigid rod-forming arylene units (Ra) chosen from p-phenylenes optionally substituted by at least one monovalent substituting group,
with
between 25 and 100 mole %, based on the total number of moles of recurring units (R), of kink-forming arylene units (Rb) chosen from (i) m-phenylenes optionally substituted by at least one monovalent substituting group and (ii) mixes of m-phenylenes with o-phenylenes, wherein both m-phenylenes and o-phenylenes are, independently from each other, optionally substituted by at least one monovalent substituting group.
5. The fastener according to claim 4 , wherein the rigid rod-forming arylene units (Ra) of the mix (M) are p-phenylenes substituted by a phenylketone group and the kink-forming arylene units (Rb) of the mix (M) are unsubstituted m-phenylenes.
6. The fastener according to claim 1 , being a threaded fastener.
7. The fastener according to claim 6 , wherein all its threads are composed of the polymer material (M) and its threaded surface represents above 20% of its whole surface.
8. The fastener according to claim 6 , being selected from the group consisting of bolts, nuts, screws, headless set screws, scrivets, threaded studs and threaded bushings.
9. The fastener according to claim 1 , being an unthreaded fastener.
10. The fastener according to claim 9 , being selected from the group consisting of pins, retaining rings, rivets, and fastening washers.
11. A self-propelled vehicle comprising at least one fastener (F) according to claim 1 .
12. The self-propelled vehicle according to claim 11 , being an aircraft.
13. The fastener according to claim 7 , being selected from the group consisting of bolts, nuts, screws, headless set screws, scrivets, threaded studs, and threaded bushings.
14. The fastener according to claim 1 , being selected from the group consisting clip nuts, nut plates, mounts, inserts, latches, hinges, clamps, and spacers.