EP0972799A1
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EP
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Vulcanizable rubber composition for treads of vehicle tires
Assignee: Pirelli and C SpA
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Filing: 1999-07-13
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Granted: —
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Expires: 2019-07-13
Abstract
Abstract A vulcanizable rubber composition for treads of vehicle tires, comprises: a) a cross-linkable unsaturated chain polymeric base including 1 to 40 phr of at least an unsaturated chain modified polymer including polar groups, b) 15 to 100 phr of a silica-based reinforcing filler including superficial hydroxyl groups, c) 0.5 to 5 parts by weight per each 100 parts by weight of said silica-based reinforcing filler of at least a sulfur-containing stabilizing agent of the vulcanization network, d) an effective amount of at least one vulcanizing agent. Advantageously, said rubber composition allows to obtain a tread with a reduced rolling resistance, a good wear resistance and a good wet-skid resistance, while reducing to a minimum the production problems associated to the use of silica as reinforcing filler.
Inventors
- 👤 Luciano Garro
- 👤 Antonio Serra
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/43; B; B60; B60C; B60C1/00; B60C1/0016; C08K3/00; C08K3/34; C08K3/36; C08K5/54; C08K5/548; C08L; C08L21/00; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
86 words
A vulcanizable rubber composition for treads of vehicle
tires comprising: a) a cross-linkable unsaturated chain polymeric base
including 1 to 40 phr of at least an unsaturated chain
modified polymer including polar groups, b) 15 to 100 phr of a silica-based reinforcing filler
including superficial hydroxyl groups, c) 0.5 to 5 parts by weight per each 100 parts by weight of
said silica-based reinforcing filler of at least a sulfur-containing
stabilizing agent of the vulcanization network, d) an effective amount of at least one vulcanizing agent.
Claim 2
Dependent Claim
48 words
Rubber composition according to claim 1, characterized
in that said cross-linkable unsaturated chain polymeric
base is selected from the group comprising: natural rubber,
polybutadiene, polychloroprene, polyisoprene, optionally
halogenated isoprene-butadiene copolymers, acrylonitrilebutadiene,
styrene-butadiene and styrene-butadiene-isoprene
terpolymers, obtained either in solution or in emulsion,
and ethylene-propylene-diene terpolymers, and mixtures
thereof.
Claim 3
Dependent Claim
45 words
Rubber composition according to claim 1, characterized
in that said silica-based reinforcing filler is obtained by
precipitation and has a BET surface area between 80 and 220
m 2 /g, and an average number of superficial hydroxyl groups
between 4 and 6 groups/nm 2 .
Claim 4
Dependent Claim
31 words
Rubber composition according to claim 1, characterized
in that said modified polymer is selected from the group
comprising: epoxidated unsaturated chain polymers,
unsaturated chain polymers including polar groups, and
mixtures thereof.
Claim 5
Dependent Claim
35 words
Rubber composition according to claim 1, characterized
in that the number of polar groups of said modified polymer
is between 1 and 20 times the number of superficial
hydroxyl groups of the silica-based reinforcing filler.
Claim 6
Dependent Claim
31 words
Rubber composition according to claim 1, characterized
in that said sulfur-containing stabilizing agent of the
vulcanization network is selected from the group
comprising: sulfur-containing silane compounds,
dithiodimorpholine, dithiocaprolactamdisulphide, and
mixtures thereof.
Claim 7
Dependent Claim
128 words
Rubber composition according to claim 6, characterized
in that said sulfur-containing stabilizing agent of the
vulcanization network is a sulfur-containing silane
compound having the following structural formula: (R) 3 -Si-C n H 2n X wherein: R is an alkyl or alkoxy group comprising 1 to 4 carbon
atoms or a chlorine atom, n is an integer of from 1 to 6,
and X is a mercapto group or a S m Y group, wherein Y is
(R) 3 -Si-C n H 2n -, wherein R and n are as defined above, or a
group selected from the following functional groups: wherein m is an integer of from 1 to 6 and R is an alkyl or
alkoxy group comprising 1 to 4 carbon atoms or a chlorine
atom.
Claim 8
Dependent Claim
20 words
Rubber composition according to claim 1, characterized
in that said at least one vulcanizing agent comprises
sulfur or sulfur donors.
Claim 9
Dependent Claim
25 words
Rubber composition according to claim 1, characterized
in that it comprises an amount between 0 and 100 phr of a
second carbon black-based reinforcing filler.
Claim 10
Dependent Claim
28 words
Rubber composition according to claims 1 and 9,
characterized in that the total amount of said silica-based
and carbon black-based reinforcing fillers is between 30
and 120 phr.
Claim 11
Dependent Claim
23 words
A low rolling resistance tread for vehicle tires,
obtainable by forming and vulcanizing a vulcanizable rubber
composition according to anyone of claims 1-10.
Claim 12
Dependent Claim
62 words
Process for manufacturing a tire for vehicle wheels
comprising the steps of preparing around the circumference
of a carcass (2) a tread (9) externally provided with a
rolling surface (9a) and of linking by vulcanization said
carcass (9) to said tread (9), characterized in that said
tread (9) is obtained by forming a vulcanizable rubber
composition according to anyone of claims 1-10.
Claim 13
Dependent Claim
66 words
A tire (1) for vehicles, comprising a tread (9)
including at least a silica-based reinforcing filler
dispersed throughout a polymer base, circumferentially
placed around a belt strip (6) and externally provided with
a rolling surface (9a) suitable to get in touch with the
ground, characterized in that the tread (9) is obtained by forming
and vulcanizing a vulcanizable rubber composition according
to anyone of claims 1-10.
Claim 14
Dependent Claim
61 words
Process for reducing the rolling resistance of tires,
said tires being provided with a tread (9)
circumferentially placed around a belt strip (6),
externally provided with a rolling surface (9a) suitable to
get in touch with the ground, characterized in that said tire tread (9) is obtained by
forming and vulcanizing a vulcanizable rubber composition
according to anyone of claims 1-10.
References Cited (Backward Citations)
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