Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1999-10-08
2002-10-22
Cain, Edward J. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S493000, C524S495000, C524S496000
Reexamination Certificate
active
06469089
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to improving wet skid resistance and more particularly to methods relating to improved wet skid resistance and elastomeric compounds exhibiting improved wet skid resistance properties. The present invention also relates to methods for preparing elastomeric compounds for enhancing wet skid resistance.
BACKGROUND OF THE INVENTION
Carbon blacks are widely used as reinforcing agents for elastomeric compounds. Silica is also used as a reinforcing agent for elastomers. However, using silica alone as a reinforcing agent for an elastomer can lead to poor performance compared to the results obtained with carbon black alone. When silica is combined with a silane coupling agent and an elastomer, the compound properties are significantly improved. When incorporated into vehicle tire tread compounds, such elastomeric compounds exhibit an improved balance of rolling resistance and wet skid resistance. Additionally, silicas with surface area between 100 and 250 m
2
/gm are conventionally used in order to get reinforcement. However, compounds containing silica as the primary reinforcing agent exhibit low thermal conductivity, high electrical resistivity, poor processability, and result in significant mechanical wear to the mixing equipment. Additionally, using pure silica as the reinforcing filler alone, leads to higher compound costs due to the correspondingly higher usage of the expensive coupling agent. Hence, silica is often used in blends with carbon black. Conventional blends of carbon black and silica lead to a poorer balance of wet skid and rolling resistance compared to using pure silica with the appropriate level of the coupling agent.
Accordingly, there is a need to develop methods of improving wet skid resistance without degrading other properties.
SUMMARY OF THE INVENTION
The present invention in part relates to an elastomeric composition exhibiting improved wet skid resistance. The composition may be useful in the manufacture of elastomeric materials, such as tires or portions thereof, hoses, belts, wiper blades, seals, gaskets, footwear, mats, and profile extrudates. The present invention also relates to methods of improving the wet skid resistance of an elastomeric composition including an elastomeric component and reinforcing fillers. The present invention relates, in part, to an elastomeric composition comprising at least one elastomeric component, at least one reinforcing filler and at least one wet skid enhancing filler.
The present invention further relates to a composition comprising:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness greater than about 4.5 and a BET surface area of less than about 100 m
2
/g:
c) at least one reinforcing filler having a BET surface area of greater than or equal to about 80 m
2
/g; and
d) at least one filler having a surface area of less than about 100 m
2
/g, wherein b), c), and d) are different from each other.
Also, the present invention relates to a composition comprising:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness greater than about 4.5 and a BET surface are of less than about 100 m
2
/g, wherein the filler is a non-aluminum containing filler; and
c) at least one reinforcing filler having a BET surface area of at least about 80 m
2
/g, wherein the filler includes at least silica.
In addition, the present invention relates to a composition comprising:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness greater than about 4.5 and a BET surface area of less than about 100 m
2
/g; and
c) at least one filler selected from 1) an aggregate comprising a silicon-containing species phase and a carbon phase; 2) an aggregate comprising a metal-containing species phase and a carbon phase; 3) a carbon product having attached at least one organic group; or 4) a silica-coated carbon black or combinations thereof.
Furthermore, the present invention relates to a composition comprising:
a) at least one elastomeric compound;
b) at least one type of silica having a BET surface area of less than 40 m
2
/g; and
c) at least one reinforcing filler having a BET surface area of at least about 80 m
2
/g.
Also, the present invention relates to a composition comprising:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness of greater than about 4.5 and a BET surface area of less than about 100 m
2
/g, wherein the filler is a non-aluminum and non-silica containing filler; and
c) at least one reinforcing filler having a BET surface area of at least about 80 m
2
/g.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are intended to provide further explanation of the present invention, as claimed.
DETAILED DESCRIPTION OF THE INVENTION
The present invention in general relates to elastomeric compositions comprising at least one elastomeric component, and at least two fillers, one of which is a wet skid enhancing filler.
Various specific embodiments of the present invention include the following, each of which include at least one elastomeric component and at least one wet skid enhancing filler and a second filler which preferably is a reinforcing filler.
In one embodiment, the composition contains:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness greater than about 4.5 and a BET surface area of less than about 100 m
2
/g:
c) at least one reinforcing filler having a BET surface area of greater than or equal to about 80 m
2
/g; and
d) at least one filler having a surface area of less than about 100 m
2
/g, wherein b), c), and d) are different from each other.
In a second embodiment, the composition contains:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness greater than about 4.5 and a BET surface are of less than about 100 m
2
/g, wherein said filler is a non-aluminum containing filler; and
c) at least one reinforcing filler having a BET surface area of at least about 80 m
2
/g, wherein said filler includes at least silica.
In a third embodiment, the composition contains:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness greater than about 4.5 and a BET surface area of less than about 100 m
2
/g; and
c) at least one filler selected from 1) an aggregate comprising a silicon-containing species phase and a carbon phase; 2) an aggregate comprising a metal-containing species phase and a carbon phase; 3) a carbon product having attached at least one organic group; or 4) a silica-coated carbon black or combinations thereof.
In a fourth embodiment, the composition contains:
a) at least one elastomeric compound;
b) at least one type of silica having a BET surface area of less than 40 m
2
/g; and
c) at least one reinforcing filler having a BET surface area of at least about 80 m
2
/g.
In a fifth embodiment, the composition contains:
a) at least one elastomeric component;
b) at least one wet skid enhancing filler with a Moh's hardness of greater than about 4.5 and a BET surface area of less than about 100 m
2
/g, wherein said filler is a non-aluminum and non-silica containing filler; and
c) at least one reinforcing filler having a BET surface area of at least about 80 m
2
/g.
With respect to any of the above-described compositions, the wet skid enhancing filler can be present in any amount. Preferably, this amount is sufficient to improve or increase the wet skid resistance of the resulting elastomeric compositoin as compared to the same elastomeric composition without the wet skid enhancing filler.
Depending on the desired properties of the compound, the wet skid enhancing filler is preferably present in an amount of from about 1 part by weight to about 60 parts by weight based on 100 parts by weight of the total amount of elastom
Kutsovsky Yakov
Mahmud Khaled
Reznek Steven R.
Wang Meng-Jiao
Cabot Corporation
Cain Edward J.
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