# US 5,702,547 A · Article reinforced by aramid monofilament having a slightly structured skin

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- Number: US 5,702,547 A
- Document ID: US5702547A
- Status: Granted
- Kind: A
- Application number: 08/465,323
- Filed: 1995-06-05
- Granted: 1997-12-30
- Earliest claimed: 1990-12-27
- Assignees: Michelin Recherche et Technique S.A.
- Inventors: Jean-Paul Meraldi; Joel Ribiere; Jean-Jacques Almon
- Web page: https://patentgrep.com/patent/US5702547A

## CPC

- B60C 9/0042: {Reinforcements made of synthetic materials}
- D01F 6/605: {from aromatic polyamides}
- D01F 11/08: of macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)}
- Y10S 57/902: Reinforcing or tyre cords
- Y10T 428/26: Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T 428/2913: Rod, strand, filament or fiber
- Y10T 428/2929: Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An aramid monofilament having high mechanical properties is provided. This monofilament has a slightly structured skin and resists fibrillation and abrasion. In addition, a process for the production of this monofilament is also provided. The process includes the following steps: (i) a solution of aromatic polyamide(s) is extruded as a liquid jet in a spinneret through a capillary; (ii) the jet is drawn from the capillary in a non-coagulating layer of fluid and (iii) the drawn liquid vein is introduced into a coagulating medium in order to form the monofilament, which is subsequently washed, dried and contacted with a solvent for said monofilament to produce the slightly structured skin. The aramid monofilament is characterized by the following relationships: 1.7.ltoreq.Ti.ltoreq.260; 50.ltoreq.D.ltoreq.480; T.gtoreq.180-D/3; Mi.gtoreq.1600; Ar>2.00; and Er>20.0 D/30. In the above relationship, Ti represents linear density in tex, D represents diameter in .mu.m (micrometers), T represents tenacity in cN/tex, Mi represents the initial modulus in cN/tex, Ar represents the elongation upon rupture in % and Er represents the energy upon rupture per unit of mass in J/g. Assemblages of such monofilaments are also provided, as well as articles reinforced by these monofilaments or assemblages, such articles being, for instance, automobile tires.

## Claims

### Claim 1

An assemblage of monofilaments comprising at least one aramid monofilament, said aramid monofilament having a slightly structured skin and satisfying the following relationships:
1.7.ltoreq.Ti.ltoreq.260;
40.ltoreq.D.ltoreq.480;
T.gtoreq.180-D/3;
Mi.gtoreq.1600;
Ar>2.00;
Er>20.0-D/30;
Ti being the titer in tex, D being the diameter in .mu.m (micrometer), T being the tenacity in cN/tex, Mi being the initial modulus in cN/tex, Ar being the elongation upon rupture in %, Er being the energy upon rupture per unit of mass in J/g in the case of this monofilament.

### Claim 2

An article reinforced by at least one aramid monofilament, said aramid monofilament having a slightly structured skin and satisfying the following relationships:
1.7.ltoreq.Ti.ltoreq.260;
40.ltoreq.D.ltoreq.480;
T.gtoreq.180-D/3;
Mi.gtoreq.1600;
Ar>2.00;
Er>20.0-D/30;
Ti being the titer in tex, D being the diameter in .mu.m (micrometer), T being the tenacity in cN/tex, Mi being the initial modulus in cN/tex, Ar being the elongation upon rupture in %, Er being the energy upon rupture per unit of mass in J/g in the case of this monofilament.

### Claim 3 (depends on 2)

An article according to claim 2, characterized by the fact that it is an automobile tire.

### Claim 4

An article reinforced by at least one assemblage of monofilaments, said assemblage comprising at least one aramid monofilament, said aramid monofilament having a slightly structured skin and satisfying the following relationships:
1.7.ltoreq.Ti.ltoreq.260;
40.ltoreq.D.ltoreq.480;
T.gtoreq.180-D/3;
Mi.gtoreq.1600;
Ar>2.00; and
Er>20.0-D/30;
Ti being the titer in tex, D being the diameter in .mu.m (micrometer), T being the tenacity in cN/tex, Mi being the initial modulus in cN/tex, Ar being the elongation upon rupture in %, Er being the energy upon rupture per unit of mass in J/g in the case of this monofilament.

### Claim 5 (depends on 4)

An article according to claim 4, characterized by the fact that it is an automobile tire.