The invention provides a tire bead filler rubber composition. Cured products obtained from such a rubber composition exhibit excellent rubber elasticity, mechanical characteristics (rigidity) and adhesion with respect to various substrates. The tire bead filler rubber composition comprises 100 parts by mass of a solid rubber (B) , 1 to 20 parts by mass of a modified liquid diene rubber (A) having a functional group (a) derived from an acid anhydride, and satisfies all the requirements (I) to (III) below, 5 to 40 parts by mass of a phenolic resin (C) and 0.5 to 2.0 parts by mass of a curing agent (D): (I) The functional group equivalent weight of the functional groups (a) is in the range of 400 to 3,500 g/eq. (II) The polystyrene-equivalent number average molecular weight (Mn) measured by gel permeation chromatography (GPC) is in the range of 5,000 to 20, 000. (III) The melt viscosity at 38°C is not less than 3 Pa·s and X (K) is not less than 6100 K wherein X is the slope of a linear line passing through two points in a graph in which the two points are values of melt viscosity η (Pa·s) at 38°C and 60°C measured with a Brookfield viscometer which are plotted as Ln [η/(Pa·s)] on ordinate versus 1/T (K-1) on abscissa (with the proviso that T is temperature (K)).
TIRE BEAD FILLER RUBBER COMPOSITION
KAUTSCHUKZUSAMMENSETZUNG FÜR REIFENWULSTFÜLLER
COMPOSITION DE CAOUTCHOUC POUR LE REMPLISSAGE DES TALONS DE PNEUS
02.07.2025
Patent
Elektronische Ressource
Englisch
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen / C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / C08F MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS , Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS |
RUBBER COMPOSITION FOR BEAD FILLER, BEAD FILLER, AND TIRE
Europäisches Patentamt | 2025
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