Patent application EP20180986A (EP), filed 2020-06-19
Publication number: EP3753989A1
Title: A PLY COAT RUBBER COMPOSITION AND A TIRE COMPRISING A PLY COAT RUBBER COMPOSITION
Abstract: In accordance with the invention, a ply coat rubber composition for a tire ply comprises from 60 phr to 90 phr of natural rubber, from 10 phr to 40 phr of synthetic polyisoprene, from 30 phr to 80 phr of pre-silanized and precipitated silica, from 0.1 phr to 5 phr of a cobalt salt, up to 15 phr of carbon black, up to 5 phr of resin, and up to 8 phr of oil. Moreover, the invention is directed to a tire comprising a ply coat rubber composition.
IPC codes: B29D  30/    38            A I
B60C   1/    00            A I
C08L   7/    00            A I
C09D 107/    00            A I
B29D  30/    40            A I
B60C   9/    00            A I
B60C   9/    20            A I
Claims: number: 1
text: A ply coat rubber composition, the rubber composition comprising:
number: 2
text: The rubber composition of claim 1 comprising:
number: 3
text: The rubber composition of claim 1 or 2, wherein the cobalt salt is present at a level which is within the range of 0.2 phr to 2 phr.
number: 4
text: The rubber composition according to one or more of the preceding claims, further comprising:
number: 5
text: The rubber composition according to one or more of the preceding claims, wherein the rubber composition comprises less than 2 phr of a resin.
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 of between 130 m<2>/g and 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 sulfur-containing silane, optionally comprised of bis(3-triethoxysilylpropyl)polysulfide containing an average of from 2 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 comprises mercapto groups at its surface, optionally between 0.1 and 1 weight % and is optionally pre-reacted with a silica coupler comprising an alkoxyorganomercaptosilane.
number: 9
text: The rubber composition according to one or more of the preceding claims, wherein the surface of said pre-silanized precipitated silica is pre-hydrophobated, optionally with a hydrocarbon chain material having at least 4 carbon atoms along its chain.
number: 10
text: The rubber composition according to one or more of the preceding claims, wherein the pre-silanized precipitated silica has a hydrocarbon chain material on its surface, wherein the weight percentage of carbon on the surface of the pre-silanized precipitated silica is between 2 and 10, optionally between 3 and 8.
number: 11
text: The rubber composition according to one or more of the preceding claims, further comprising an additional silica coupling agent wherein the phr ratio of said pre-silanized precipitated silica to the silica coupling agent is between 5:1 and 30:1.
number: 12
text: The rubber composition according to one or more of the preceding claims, wherein the rubber composition comprises less than 5 phr of oil and/or wherein the rubber composition is essentially free of polyethylene glycol.
number: 13
text: A tire (1) having one or more of a belt ply (11), a carcass ply (9), an overlay ply (12) and a ply strip (9'), wherein at least one of the plies (9, 11, 12) or the ply strip (9') of the tire (1) comprises a rubber composition comprising:
number: 14
text: The tire of claim 13, wherein the ply (9, 11, 12) or ply strip (9') of the tire (1) comprises a textile calendered on both sides with the rubber composition.
number: 15
text: The tire of claim 13 or 14, wherein said ply (9, 11, 12) or ply strip (9') comprises a plurality of essentially parallelly extending metal wires (15) coated with the rubber composition, wherein, optionally, the plurality of parallelly extending metal wires (15) define a plane of parallelly extending metal wires which are calendered on both sides with the rubber composition.
Office action: search_report, dated 2020-12-23
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Final disposition: pending (2020-12-23)