Pipes and tubular conduits – Distinct layers – Bonded to each other
Reexamination Certificate
1999-08-16
2001-08-28
Yoon, Tae H. (Department: 1714)
Pipes and tubular conduits
Distinct layers
Bonded to each other
C138S133000, C428S035700, C428S462000
Reexamination Certificate
active
06279616
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to rubber compositions, hoses fabricated using the rubber compositions, and methods of fabricating hoses using the rubber compositions. More particularly, the present invention relates to rubber compositions usable for various purposes, reinforced hoses made of the rubber compositions, and to methods of manufacturing reinforced hoses using the rubber compositions.
BACKGROUND OF THE INVENTION
A variety of rubber products such as hoses, belts rubber rolls and molded goods are widely used for many purposes. With rubber goods, there is continuing need to improve performance by, for example, improving low temperature flexibility, maintaining physical properties when the goods are exposed to heat, and improving oil resistance and ozone resistance. These considerations are of special importance with hydraulic fluid transfer hoses. In that such hoses are used for a multitude of applications, they are produced in great quantities. Accordingly, there is a need to decrease the cost of the rubber compound component of such hoses, as well as to improve the processibility of the rubber compound in both mixing and hose manufacturing steps. As always, it is also desirable to decrease the amount of scrap generated by the manufacturing process.
While accomplishing these ends, it is an important consideration to improve adhesion to metal substrates, such as brass coated wire substrates, which are used for reinforcement. Such an improvement can occur by omitting adhesion promoters from the compound formulation so as to avoid problems in both processing and in the finished product. In addition, there are problems introduced by using processing aids such as waxes and oils which normally interfere with adhesion between the rubber and metal. By minimizing the use of process aids, adhesion between the rubber and metal. By minimizing the use of process aids, adhesion problems can be reduced and the cost of manufacture decreases. In producing hose which has braided wire reinforcement, it is necessary to expose the rubber tubular portion to freezing temperatures. By lowering the freezing temperature, refrigeration costs are reduced. Moreover, with reinforced hose, the tubular portion of the hose which is manufactured from a rubber composition must stiffen prior to braiding. Accordingly, if the tube stiffens more quickly, there is improved dimensional stability during storage prior to braiding so that braiding can be performed more quickly after the rubber tubing has been produced. This lowers inventory and storage costs.
In view of the aforementioned considerations, there is a need for improvements in rubber compounds, which lead to improved hose performance at lower costs. While these considerations are of specific importance relative to hydraulic fluid hose, they are also of considerable importance with respect to other rubber and rubber based products.
SUMMARY OF THE INVENTION
In view of these features and other features, the present invention is directed to novel compositions for a rubber compound comprising the first component selected from the group consisting of the acrylonitrile butadiene, chlorinated polyethylene, chlorosulfanated polyethylene, and polychloroprene. A second component is selected from a group not duplicating the first component, and consisting of polychloroprene, acrylonitrile butadiene, and chlorosulfonated polyethylene. A third component is selected from the group consisting of polyoctanamer, isoprene, polybutadiene, and styrene butadiens. The composition has more of the first component than the second component or the third component.
In a more specific and preferable aspect of the invention, the first component is acrylonitrile butadiene, the second component is polychloroprene, and the third component is polyoctanamer.
In another aspect of the invention, a hose structure is provided which includes a metal substrate, preferably made of brass coated metal wire, to which the aforedescribed novel rubber compositions are bonded.
In still a further aspect of the invention, the reinforced hose is made according to a method in which a tube is formed of the novel rubber compositions and the brass coated wire is then braided upon the tube.
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Croft Thomas C.
Perkins Kevin T.
Millen White Zelano & Branigan P.C.
Yoon Tae H.
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