Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1999-06-10
2001-07-17
Cain, Edward J. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S494000
Reexamination Certificate
active
06262154
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a rubber-reinforcing fiber treatment agent, a reinforcing fiber and a rubber-reinforced product. More specifically, it relates to a treatment agent for a rubber-reinforcing fiber that is used to reinforce rubber products such as a rubber belt, tire and the like and is excellent in adhesion, heat resistance, flexing resistance and water resistance; a rubber-reinforcing fiber coated with the treatment agent; and a rubber-reinforced product reinforced with the reinforcing fiber.
BACKGROUND ART
As a reinforcement for a rubber product such as a rubber belt, tire and the like, reinforcing fibers such as glass fibers, polyester fibers, polyamide fibers and the like are widely used.
Since a rubber product such as a rubber belt and the like undergoes flex stress repeatedly, its performance degrades due to its flex fatigue, whereby a reinforcing fiber may be separated from a rubber matrix or worn out, with the result that its strength lowers easily. Such a phenomenon tends to be accelerated by heat and moisture, in particular. To prevent such flex fatigue by separation and obtain a sufficient reinforcing effect, drape and adhesion between a reinforcing fiber and rubber must be increased, and heat resistance and water resistance must be provided to the reinforcing fiber. To this end, various treatment agents are coated on the surface of a reinforcing fiber.
JP-A 1-221433 proposes various treatment agents such as a treatment agent comprising a resorcin-formaldehyde water-soluble condensate, vinylpyridine-butadiene-styrene terpolymer latex, dicarboxylated butadiene-styrene copolymer latex and chlorosulfonated polyethylene latex in combination.
Although the use of these treatment agents can improve adhesion between a reinforcing fiber and a rubber matrix and the heat resistance and flexing resistance of a treatment agent itself to a certain degree, it cannot yet be said that they are satisfactory. Therefore, rubber products having excellent heat resistance, water resistance and resistance to flex fatigue are difficult to obtain when reinforcing fibers treated with these treatment agents are used.
To increase adhesion between the reinforcing fiber and a rubber matrix, JP-B 5-71710 also proposes a rubber-reinforcing fiber formed by laminating the second layer containing a halogen-containing polymer and isocyanate on the first layer formed on a reinforcing fiber and containing a resorcin-formaldehyde water-soluble condensate and a latex and further laminating the third layer containing the same rubber as matrix rubber on the second layer. The production process of the rubber-reinforcing fiber of this type, however, is complicated and uneconomical since the second and third layer-forming steps are required, subsequently to the first layer-forming step.
DISCLOSURE OF INVENTION
It is the first object of the present invention to provide a fiber treatment agent for a reinforcing fiber, which solves the above problems of the prior art and can give reinforced rubber products having excellent heat resistance, water resistance and resistance to flex fatigue without undergoing a complicated production process.
It is the second object of the present invention to provide the above reinforcing fiber treated with the fiber treatment agent of the present invention.
It is the third object of the present invention to provide a reinforced product reinforced with the reinforcing fiber of the present invention.
Other objects and advantages of the present invention will become apparent from the following description.
According to the present invention, firstly, the above objects and advantages of the present invention can be attained by a rubber-reinforcing fiber treatment agent comprising a rubber latex, a resorcin-formaldehyde water-soluble condensate and triazine thiol.
According to the present invention, secondly, there is provided a reinforcing fiber treated with the above fiber treatment agent of the present invention and, thirdly, there is provided a rubber-reinforced product reinforced with the rubber-reinforcing fiber of the present invention.
The present invention will be described in detail hereinafter.
(Rubber-reinforcing Fiber Treatment Agent)
As the rubber latex which is one of the components of the rubber-reinforcing fiber treatment agent of the present invention may be preferably used a butadiene-styrene copolymer latex, dicarboxylated butadiene-styrene copolymer latex, vinylpyridine-butadiene-styrene terpolymer latex, chloroprene latex, butadiene rubber latex, chlorosulfonated polyethylene latex, acrylonitrile-butadiene copolymer latex, nitrile group-containing highly saturated copolymer rubber latex and the like. These latices may be used alone or in admixture of two or more. A favorable result can be obtained in many cases by using a latex of rubber, which is the same as or similar to rubber to be reinforced in type, as the rubber latex to be contained in the rubber-reinforcing fiber treatment agent. A particularly favorable result can be obtained by applying a fiber treatment agent containing nitrile group-containing highly saturated copolymer rubber latex to a fiber for reinforcing a rubber blend that contains nitrile group-containing highly saturated copolymer rubber.
As the butadiene-styrene copolymer rubber latex, it is particularly suitable to use, for example, a copolymer prepared by copolymerizing butadiene and styrene in a weight ratio of 60:40 to 90:10. Preferred examples of this latex include JSR 2108 (trade name, manufactured by Japan Synthetic Rubber Co., Ltd.), Baystal S60 (trade name, manufactured by Bayer AG), J9040 (trade name, manufactured by Sumika ABS Latex Co., Ltd.), Nipol LX110 (trade name, manufactured by Nippon Zeon Co., Ltd.) and the like.
As the dicarboxylated butadiene-styrene copolymer latex, a copolymer comprising 20 to 80 wt % of butadiene, 5 to 70 wt % of styrene and 1 to 10 wt % of an ethylenic unsaturated dicarboxylic acid is particularly suitable, for example. Preferred examples of this latex include Nipol 2570X5 (trade name, manufactured by Nippon Zeon Co., Ltd.), JSR 0668 (trade name, manufactured by Japan Synthetic Rubber Co., Ltd.) and the like.
As the vinylpyridine-butadiene-styrene terpolymer latex may be used, for example, many terpolymers of this type known to those skilled in the art. For example, a terpolymer comprising vinylpyridine, butadiene and styrene in a weight ratio of 10:80:10 to 20:60:20 is particularly suitable. Preferred examples of this terpolymer include Nipol 2518FS (trade name, manufactured by Nippon Zeon Co., Ltd.), JSR 0650 (trade name, manufactured by Japan Synthetic Rubber Co., Ltd.), Pyratex (trade name, manufactured by Sumika ABS Latex Co., Ltd.) and the like.
As the chlorosulfonated polyethylene latex, a polymer having a chlorine content of 25 to 43 wt % and a sulfur content of 1.0 to 1.5 wt % is particularly suitable. Preferred examples of this terpolymer include CSM-450 (trade name, manufactured by Sumitomo Seika Chemicals Co., Ltd.) and the like.
As the acrylonitrile-butadiene copolymer latex, a copolymer containing 30 to 43% of bound acrylonitrile is particularly suitable. Preferred examples of this latex include Nipol 1561 (trade name, manufactured by Nippon Zeon Co., Ltd.) and the like.
The nitrile group-containing highly saturated polymer rubber latex preferably has an iodine valence of 120 or less from the viewpoint of the strength of a rubber film and the adhesion strength to matrix rubber. The valence of iodine is preferably 0 to 100. The content (amount of bound acrylonitrile) of unsaturated nitrile units in the nitrile group-containing highly saturated polymer rubber is preferably 10 to 60 wt % from the viewpoint of adhesion and drape for the matrix rubber. Illustrative examples of the nitrile group-containing highly saturated polymer rubber include hydrogenated products of butadiene-acrylonitrile copolymer rubber, isoprene-butadiene-acrylonitrile copolymer rubber and isoprene-acrylonitrile copolymer rubber; butadiene-methyl acrylate-acrylonitrile copolymer rubber, bu
Akiyama Mitsuharu
Hamaguchi Takuo
Ishihara Mitsugu
Mori Osamu
Okamura Akinobu
Cain Edward J.
Nippon Sheet Glass Co. Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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