Vehicle tire having a tread comprising a heat-expandable rubber composition
A technology of rubber composition and expanded rubber, which is applied in the field of rubber composition of treads and treads of winter tires, and can solve problems such as not being very suitable
Active Publication Date: 2014-02-05
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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Problems solved by technology
These particles, which can be used as miniature cleats on hard ice, remain relatively aggressive to the ground surface in fact through the well-known "claw" effect; they are not very suitable for rolling conditions on melting ice
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[0013] All percentages (%) shown in this specification are % by weight unless expressly stated otherwise. The abbreviation "phr" (French abbreviation "pce") indicates parts by weight per 100 parts of elastomer (or parts by weight per 100 parts of total elastomer if several elastomers are present).
[0014] Furthermore, any numerical interval indicated by the expression "between a and b" represents a numerical range greater than "a" and less than "b" (i.e., excluding the endpoints a and b), while the expression "a to b Any numerical interval indicated by " means the numerical range extending from "a" to "b" (ie including the strict endpoints a and b).
[0015] Therefore, the tire of the invention has the essential feature that its tread, which is intended to come at least partially (radially outermost part) directly into contact with the road surface, comprises in an unvulcanized state a thermally expandable rubber composition which can The expanded rubber composition comprise...
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Abstract
The invention relates to a vehicle tire, particularly to a winter tire, the tread of which comprises a rubber composition which is heat-expandable in the non-vulcanized state, and which is expanded in the vulcanized state. In the non-vulcanized state, the composition comprises: a diene elastomer, such as natural rubber and / or polybutadiene; more than 50 pce of a reinforcing filler, such as silica and / or carbon black; 5 to 25 pce of a sodium or potassium (hydrogen) carbonate; and 2 to 20 pce of a carboxylic acid having a melting point of 60 DEG C to 220 DEG C, such as e.g. citric acid or stearic acid. The total (hydrogen) carbonate and carboxylic acid content is higher than 10 pce, preferably higher than 15 pce. The combined use of the two latter compounds with said recommended high contents greatly enhances the grip of the tire on melting ice.
Description
technical field [0001] The present invention relates to rubber compositions for use as treads for vehicle tires, in particular for use as "winter" tires (also Known as the rubber composition of the tread of a studless tire). [0002] More particularly, the present invention relates to treads for winter tires particularly suitable for rolling in "melting ice" conditions, which generally occur in the temperature range between -5°C and 0°C. It should be remembered in particular that in this range the pressure of the tires during the passage of the vehicle causes the surface of the ice to melt, the ice being covered with a film of water that is detrimental to the grip of these tires. Background technique [0003] In order to avoid the detrimental effects of the studs, in particular their strong abrasive action on the surface of the ground itself and their significantly poorer road performance on dry surfaces, tire manufacturers offer various solutions including changing the for...
Claims
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IPC IPC(8): B60C1/00C08L9/00C08K3/26C08K5/09C08L21/00C08L7/00
CPCC08K3/26C08K3/36C08L9/00C08L7/00C08K3/04C08K5/09B60C1/0016C08L21/00
Inventor 前阪将之S·帕加诺
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN