Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1992-08-24
1995-06-27
Thibodeau, Paul J.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
57200, 57243, 57250, 57257, 57902, 152451, 152527, 264178R, 264183, 264108, 428 1, 4284744, 4284758, 4284763, 428494, 428495, 428517, 428519, B60C 500, C09K 1900
Patent
active
054271657
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to reinforcement assemblages formed at least in part of monofilaments of organic material, these assemblages being used to reinforce articles of plastic and/or rubber, particularly automobile tires.
French Patent 1,495,730 and U.S. Pat. No. 3,638,706 describe reinforcement assemblages made with conventional monofilaments of flexible polymers, the diameters of these monofilaments being greater than 100 .mu.m. These assemblages have low tenacities and tensile moduli.
It is known to use reinforcement assemblages formed of plied yarns of multi-filaments of liquid crystal organic polymers, for instance aramid multi-filaments, the diameter of each elementary filament being small, on the order of 13 .mu.m. These assemblages have high tenacities, but their tensile modulus is definitely less than that of the initial multi-filaments.
Japanese Patent Application JP-A-58-43802 describes the use, in the crown of an automobile tire, of monofilaments, possibly twisted together, which monofilaments may be made of aromatic polyamides. Said application does not give any information with regard to the mechanical properties of these monofilaments or of the assemblages which they form.
International Application PCT/CH90/00155, corresponding to U.S. Pat. No. 5,246,776, incorporated herein by reference describes aramid monofilaments having very high moduli and tenacities. Said application briefly mentions the possibility of using these monofilaments in reinforcement assemblages, but without giving any information as to the structure or properties of these assemblages.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to propose a reinforcement assemblage with monofilaments of liquid crystal organic polymer or polymers, said assemblage having very high tenacities and tensile moduli.
Therefore, the reinforcement assemblage in accordance with the invention, formed at least in part of continuous monofilaments of liquid crystal organic polymer or polymers, is characterized by the following features: and less than 400 .mu.m; 2000 cN/tex; around an axis, the acute angle .gamma. which each monofilament makes with said axis, which is assumed rectilinear, being less than 30.degree.; meter of assemblage.
The invention also concerns articles reinforced by these assemblages, in particular automobile tires.
DESCRIPTION OF THE DRAWING
The invention will be readily understood on basis of the non-limitative examples which follow and the diagrammatic figure relating to these examples, said figure being a section through a tire.
DESCRIPTION OF PREFERRED EMBODIMENTS
For simplicity in description, in the following text the term "monofilament" designates only monofilaments of a diameter at least equal to 40 .mu.m, and the term "filament" designates only monofilaments the diameter of which is less than 40 .mu.m. The term "yarn" is used for an assembly of several continuous filaments, said assemblages being practically without twist. The term "product" designates a monofilament, a yarn or a textile assemblage.
By "liquid crystal polymer", there is understood herein, in known manner, a polymer capable of giving an optically anisotropic spinning composition in the molten state and at rest, that is to say in the absence of dynamic stress, whether the polymer itself is in the molten state (in which case it is called "thermotropic") or in solution (in which case it is called "lyotropic"). Such a composition depolarizes light when observed through a microscope between crossed linear polarizers.
The invention will be illustrated by the following examples, these examples being produced, unless otherwise indicated, with aramid filaments or monofilaments.
1. Conditioning
By conditioning, there is understood in the present specification the treatment of the products in accordance with German Federal Standard DIN 53 802-20/65 of July 1979.
2. Titer
The titer of the products is determined in accordance with Federal German Standard DIN 53 830 of June 1965, these products havi
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World Patents Index Latest, Derwent Publications Ltd., JP-A-5843802 (Sumitomo (Sumitomo Rubber Ind KK) 14-03-83.
WO,A,9 100 381 (Michelin Recherche et Technique) 10 Jan. 1991.
Kautschuk und Gummi--Kunststoffe, vol. 36, No. 10, Oct. 1983, Heidelberg DE, pp. 870-874.
Patent Abstracts of Japan, vol. 14, No. 17 (C-675) 16 Jan. 1990 & JP,01 259 062 (Toray Ind. Inc.) 16 Jan. 1989.
Balestra Claudio
Ribiere Joel
Kiliman Leszek
Michelin Recherche ET Technique S.A.
Thibodeau Paul J.
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