Patent application EP20181007A (EP), filed 2020-06-19
Publication number: EP3753990A1
Title: A WIRE COAT RUBBER COMPOSITION FOR A TIRE AND A TIRE COMPRISING A WIRE COAT RUBBER COMPOSITION
Abstract: In accordance with the invention a wire coat rubber composition for a tire comprises from 70 phr to 100 phr of cis 1,4-polyisoprene rubber, from 0 phr to 30 phr of solution-polymerized styrene butadiene rubber, from 65 phr to 95 phr pre-silanized precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr carbon black, up to 10 phr of a resin, and up to 10 phr oil. Further the present invention is directed to a tire comprising such a wire coat composition.
IPC codes: B29D  30/    38            A I
B60C   1/    00            A I
C08L   7/    00            A I
C09D 107/    00            A I
Claims: number: 1
text: A wire coat rubber composition for a tire, the rubber composition comprising:
number: 2
text: The rubber composition of claim 1, wherein the cobalt salt is present at a level which is within the range of 0.2 to 5, preferably 0.2 to 2, phr.
number: 3
text: The rubber composition according to claim 1 or 2, further comprising from 1 to 20 phr zinc oxide, preferably from 5 to 15 phr zinc oxide.
number: 4
text: The rubber composition according to one or more of the preceding claims, further comprising from 1 to 15 phr sulfur, preferably from 3 to 10 phr sulfur.
number: 5
text: The rubber composition according to one or more of the preceding claims, wherein the amount of resin in the composition is less than 5 phr.
number: 6
text: The rubber composition according to one or more of the preceding claims, wherein the pre-silanized precipitated silica has a CTAB adsorption surface area which is within the range of 130 m<2>/g to 210 m<2>/g.
number: 7
text: The rubber composition according to one or more of the preceding claims, wherein said pre-silanized precipitated silica is precipitated silica pre-reacted with a silica coupler comprised of bis(3-triethoxysilylpropyl)polysulfide containing an average of from 1 to 5 connecting sulfur atoms in its polysulfidic bridge or an alkoxyorganomercaptosilane.
number: 8
text: The rubber composition according to one or more of the preceding claims, wherein said pre-silanized precipitated silica is pre-hydrophobated, optionally with a hydrocarbon chain material with at least 4 carbon atoms along its chain length.
number: 9
text: The rubber composition according to one or more of the preceding claims, wherein the rubber composition comprises less than 5 phr oil.
number: 10
text: The rubber composition according to one or more of the preceding claims, wherein the glass transition temperature of the solution styrene butadiene rubber is between -30°C and -90°C, alternatively between -50°C and -70°C, and wherein, optionally, the solution-polymerized styrene butadiene rubber is a tin-coupled polymer.
number: 11
text: The rubber composition according to one or more of the preceding claims, wherein the solution-polymerized styrene butadiene rubber is functionalized for improved compatibility with silica, wherein the solution-polymerized styrene butadiene rubber is optionally thio-functionalized.
number: 12
text: The rubber composition according to one or more of the preceding claims, wherein the solution-polymerized styrene butadiene rubber has a styrene content from 5% to 50%, preferably from 10% to 20%, and/or a vinyl content from 5% to 60%, preferably from 20% to 40%.
number: 13
text: The rubber composition according to one or more of the preceding claims, comprising:
number: 14
text: The rubber composition according to one or more of claims 1 to 12, comprising:
number: 15
text: A tire (1) comprising at least one of the following components: a ply (9, 11, 12) and a ply strip (9'), wherein the component (9, 9', 11, 12) comprises wires (15) being coated with the rubber composition (20) according to one or more of the preceding claims,
wherein, optionally, the ply (9, 11, 12) or ply strip (9') comprises a plurality of essentially parallelly extending, and spaced apart from one another, metal wires (15) coated with the rubber composition (20), wherein the plurality of metal wires (15) preferably defines a plane of parallelly extending and spaced apart from one another metal wires (15) which is preferably calendered on both sides with the rubber composition (20).
Office action: search_report, dated 2020-12-23
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Final disposition: pending (2020-12-23)