Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1999-07-30
2001-06-05
Nutter, Nathan M. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S232000, C525S233000, C525S234000, C525S235000, C525S236000, C525S237000, C525S240000, C525S241000, C152S151000, C152S450000, C152S525000, C152S548000
Reexamination Certificate
active
06242534
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a rubber mixture containing at least one rubber component, at least one filler, and, optionally, conventional additives.
2. Discussion of Background Information
Rubber mixtures are used for the production of rubber products for a wide variety of uses. Depending on the field of use, various demands are also placed on the corresponding rubber mixture employed. Thus, in addition to the rubber components of the rubber mixture, the rubber mixture contains other components, such as fillers, anti-aging agents, and vulcanizing agents, which significantly influence the properties of the finished rubber product. Therefore, suitable systems of polymers and/or other components must be prepared in order to obtain the appropriate properties of the rubber product. Fillers play an especially significant role in a rubber mixture. Thus, they contribute not only to reducing the cost of rubber mixtures, but their specific action on the rubber is also utilized. For this reason, there has been no lack of tests in which a wide variety of fillers, for example, were added into the rubber mixture. Thus, carbon black and silicic acid, for example, are known as fillers. It has been observed that rubber products which contain carbon black, for example, as a filler, have a sufficient mechanical load-bearing capacity, but with the use of these mixtures in tire treads, the tires demonstrate the disadvantage of a high rolling resistance and poor wet slippage behavior. An attempt has been made to solve this problem by adding silicic acid into the tread mixture, where a filler activator is required in turn for binding the silicic acid to the polymer. However, it was clear that rubber products which contain silicic acid as a filler and contain a conventional organosilane as a filler activator (e.g., bis-3-(triethoxysilylpropyl)tetrasulfide) insufficiently influence the hysteresis behavior and the reinforcing of the rubber product for modern fields of utilization. Thus, in particular for the production of vehicle tires (e.g., treads), rubber mixtures are required that, in the vulcanized state, lend the tire an even lower rolling resistance with an additionally improved wet slippage behavior. At the same time, other mechanical properties, such as durability, should be negatively influenced as little as possible.
EP 0 854 171 Al describes rubber gels whose surfaces are modified with vulcanization-active, sulfur-containing chemicals. On the surface of the gel, there are then sulfur-containing reactive groups (dithiophosphoric acid groups, among others), which permit bonding to the double bond-containing rubber.
SUMMARY OF THE INVENTION
Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawing.
The invention provides rubber mixtures that demonstrate an improved hysteresis behavior in the vulcanized state so that, for example, with the use of these rubber mixtures in tires, the rolling resistance is reduced and the wet slippage behavior is improved in comparison to conventional rubber mixtures. In addition, the elastomer mixture is better reinforced through the use of a suitable filler system.
The invention further provides methods of formulating such rubber mixtures.
The invention further provides articles, such as pneumatic tires, and vehicle tires, formed of such rubber mixtures.
The invention provides a composition comprising a rubber mixture which comprises:
A) at least one rubber component;
B) at least one first gel as a filler, which comprises a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, and wherein at least the surface of the gel has groups selected from acid and base groups and combinations thereof, wherein with the proviso that these groups have not been produced by means of reaction with dithiophosphoric acid; and,
C) at least one second gel as an additional filler, which comprises a member selected from
1) a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, which is capable of undergoing a neutralization reaction with the acid or base groups of the first gel; and
2) at least one substance as an additional additive, which is capable of undergoing a neutralization reaction with acid or base groups of at least one gel,
and combinations of 1) and 2).
The invention also provides a vehicle tire comprising a tread formed of a composition comprising a rubber mixture which comprises:
A) at least one rubber component;
B) at least one first gel as a filler, which comprises a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, and wherein at least the surface of the gel has groups selected from acid and base groups and combinations thereof, wherein with the proviso that these groups have not been produced by means of reaction with dithiophosphoric acid; and,
C) at least one second gel as an additional filler, which comprises a member selected from
1) a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, which is capable of undergoing a neutralization reaction with the acid or base groups of the first gel; and
2) at least one substance as an additional additive, which is capable of undergoing a neutralization reaction with acid or base groups of at least one gel,
and combinations of 1) and 2).
The invention also provides a pneumatic tire comprising a composition comprising a rubber mixture which comprises:
A) at least one rubber component;
B) at least one first gel as a filler, which comprises a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, and wherein at least the surface of the gel has groups selected from acid and base groups and combinations thereof, wherein with the proviso that these groups have not been produced by means of reaction with dithiophosphoric acid; and,
C) at least one second gel as an additional filler, which comprises a member selected from
1) a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, which is capable of undergoing a neutralization reaction with the acid or base groups of the first gel; and
2) at least one substance as an additional additive, which is capable of undergoing a neutralization reaction with acid or base groups of at least one gel,
and combinations of 1) and 2).
The invention also provides a method of formulating and blending a composition comprising forming a mixture comprising at least one rubber component and at least one first gel as a filler, which comprises a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, and wherein at least the surface of the gel has groups selected from acid and base groups and combinations thereof, with the proviso that these groups have not been produced by means of reaction with dithiophosphoric acid; and adding at least one second gel as an additional filler, which comprises a member selected from
1) a rubber, has a particle size of from about 3×10
−9
to about 1×10
−6
m, and has a swelling index in toluene of from about 1 to about 15, which is capable of undergoing a neutralization reaction with the acid or base groups of the first gel; and
2) at least one substance as an additional additive, which is capable of undergoing a neutralization reaction with acid or base groups of at least one gel,
and combinations of 1) and 2).
The acid and/or base groups of at least one gel may be p
Monroy Victor
Obrecht Werner
Scholl Thomas
Well Michael
Wendling Peter
Continental Aktiengesellschaft
Greenblum & Bernstein P.L.C.
Nutter Nathan M.
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