Patent application EP20180374A (EP), filed 2020-06-16
Publication number: EP3753978A1
Title: A TEXTILE COAT RUBBER COMPOSITION FOR A TIRE AND A TIRE COMPRISING A TEXTILE COAT RUBBER COMPOSITION
Abstract: [0001]    In accordance with the invention, a textile cord coat composition for a tire comprises from 70 to 90 phr cis 1,4-polyisoprene rubber, from 10 to 30 phr styrene butadiene rubber, from 20 to 50 phr carbon black, the latter comprising between 1 and 6 phr high surface area carbon black having a BET surface area of more than 700 m<2>/g. Moreover, the invention is directed to a tire comprising such a textile cord coat composition.
IPC codes: B60C   1/    00            A I
B60C   9/    00            A I
C08K   3/    04            A I
C08K   5/    18            A I
C08K   9/    04            A I
C08L   7/    00            A I
Claims: number: 1
text: A textile cord coat rubber composition for a tire, the composition comprising:
number: 2
text: The composition according to claim 1, comprising from 2 to 6 phr of the high surface area carbon black.
number: 3
text: The composition according to claim 1 or 2, comprising
from 75 to 90 phr cis 1,4-polyisoprene rubber,
from 10 to 25 phr styrene butadiene rubber,
from 25 to 40 phr carbon black comprising from 2 to 5 phr of the high surface area carbon black.
number: 4
text: The composition according to one or more of the preceding claims, wherein the high surface area carbon black has a BET surface area of
more than 800 m<2>/g, preferably of at least 900 m<2>/g, and
of up to 1500 m<2>/g, preferably up to 1100 m<2>/g.
number: 5
text: The composition according to one or more of the preceding claims, wherein the high surface area carbon black has an oil absorption value of more than 300 ml / 100 g, preferably from 350 ml / 100 g to 500 ml / 100 g, and/or wherein the high surface area carbon black has an average particle size which is within the range of 20 nm to 40 nm.
number: 6
text: The composition according to one or more of the preceding claims, further comprising a carbon black coupling agent, the agent comprising amino groups for coupling to carbon black and double bonds for reacting with the cis 1,4-polyisoprene rubber.
number: 7
text: The composition according to one or more of the preceding claims, wherein the carbon black coupling agent is of the structural formula:
number: 8
text: The composition according to claim 6 or 7, wherein the carbon black coupling agent is present at a level which is within a range of 0.1 phr to 5 phr, preferably within a range of 0.5 phr to 3 phr.
number: 9
text: The composition according to one or more of the preceding claims, wherein said composition is further comprising 3 phr to 7 phr of sulfur and/or 1 phr to 10 phr of zinc oxide.
number: 10
text: The composition according to one or more of the preceding claims, wherein said composition comprises at most 10 phr of silica.
number: 11
text: The composition according to one or more of the preceding claims, wherein said composition is further comprising a resin at a level which is within the range of 4 phr to 10 phr.
number: 12
text: The composition according to one or more of the preceding claims, wherein said composition is further comprising a methylene donor and a methylene acceptor, wherein the weight ratio of the methylene donor to the methylene acceptor is preferably within the range of 1:3 to 3:1.
number: 13
text: The composition according to claim 12, wherein the methylene acceptor is of the chemical structural formula:
number: 14
text: A textile reinforced rubber ply (9, 9', 11, 12) comprising a rubber composition according to one or more of the preceding claims and having a plurality of substantially parallel reinforcing textile cords (15) therein.
number: 15
text: A pneumatic tire (1) comprising at least one of the following components: a carcass ply (9), a belt ply (11), an overlay ply (12) and a ply strip (9'), wherein at least one of the components comprised in the tire comprises textile cords (15) coated with a rubber composition according to one or more of the claims 1 to 13.
Office action: search_report, dated 2020-12-23
Rejection reasons: novelty_epc_54
inventive_step_epc_56
Prior art cited: ref_id: US5229459A
ref_type: patent
severity: background
ref_id: US5049618A
ref_type: patent
severity: background
ref_id: US2014326928A1
ref_type: patent
severity: background
ref_id: US2014128532A1
ref_type: patent
severity: background
ref_id: US2014128532
ref_type: patent
severity: obviousness
ref_id: US2014326928
ref_type: patent
severity: novelty_destroying
Final disposition: pending (2020-12-23)