Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-02-26
1999-11-30
Nutter, Nathan M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524175, 524176, 524543, 524570, 524571, 524572, 5245755, C09J 1104, C09J12100, C08K 5098, C08K 324
Patent
active
059944340
DESCRIPTION:
BRIEF SUMMARY
This application is filed under 35U.S.C. 371 claiming priority to PCT/JP 97/022A filed Jun. 26, 1997.
FIELD OF THE INVENTION
This invention relates to an adhesion promoter composition and an adherent rubber composition containing the adhesion promoter composition. More particularly the invention relates to (1) an adhesion promoter composition suitable for promoting the adhesion between brass plated steel cord and a rubber composition for coating the steel cord (hereinafter "coating rubber") and (2) an adherent rubber composition containing the adhesion promoter composition.
BACKGROUND OF THE INVENTION
In order to improve performances of automobile tires, conveyor belts and the like, steel cords are generally used as a reinforcing member.
Such steel cords are subjected to a brass plating in order to increase their adhesion to rubber (hereinafter "adhesive force") which thereby enhances their reinforcing effect.
On the other hand, a cobalt salt of an organic acid may be compounded as an adhesion promoter in a rubber composition in order to increase the adhesive force between rubber and steel cord.
However, the use of cobalt is not desirable for safety concerns and due to its high cost. And also, in case of using a cobalt salt of an organic acid, the adhesion property just after vulcanization is excellent, but the adhesion property after thermal aging is poor.
When the other metal salts of organic acids are compounded instead of the cobalt salt of the organic acid, the adhesive force just after vulcanization is poor. Therefore, metal salts of organic acids have not yet been put into practical use as a replacement for cobalt salts.
SUMMARY OF INVENTION
An object of the invention is to provide an adhesion promoter composition being advantageous in safety and economy and having a stably high adhesive force, and an adherent rubber composition containing the adhesion promoter composition.
In order to achieve the above object, the adhesion promoter composition according to the present invention is characterized as follows. selected from the group consisting of Zn, K, Al, Ti and Zr, and a hydrous inorganic salt. selected from the group consisting of Zn, K, Al, Ti and Zr, and an organic molybdenum compound. according to the above item (1), an organic molybdenum compound is further included. or (3), a molar ratio (H.sub.2 O /Me) of water (H.sub.2 O) in the hydrous inorganic salt to metal (Me) in the metal salt of the organic acid is 0.1-100. or (3), a molar ratio (Mo/Me) of molybdenum (Mo) in the organic molybdenum compound to metal (Me) in the metal salt of the organic acid is 0.01-100. molar ratio (H.sub.2 O/Me) of water (H.sub.2 O) in the hydrous inorganic salt to metal (Me) in the metal salt of the organic acid is 0.1-100, and a molar ratio (Mo/Me) of molybdenum (Mo) in the organic molybdenum compound to metal (Me) in the metal salt of the organic acid is 0.01-100, and a molar ratio (H.sub.2 O/Mo) of water (H.sub.2 O) in the hydrous inorganic salt to molybdenum (Mo) in the organic molybdenum compound is 1-500.
Furthermore, the adherent rubber composition according to the invention is constructed as follows. consisting of natural rubber and synthetic rubbers, b) an adhesion promoter composition described in any one of the above items (1)-(6), and c) sulfur. adhesion promoter composition described in the above item (1) or (4) is compounded in an amount of 2.0.times.10.sup.-4 -2.0.times.10.sup.-2 mole calculated in terms of metal in the metal salt of the organic acid and in an amount of 2.5.times.10.sup.-3 -2.5.times.10.sup.-1 mole calculated in terms of water in the hydrous inorganic salt, and sulfur is compounded in an amount of 3-8 g, based on 100 g of the rubber ingredient. adhesion promoter composition described in the above item (2) or (5) is compounded in an amount of 2.0.times.10.sup.-4 -2.0.times.10.sup.-2 mole calculated in terms of metal in the metal salt of the organic acid and in an amount of 2.0.times.10.sup.-6 -2.0.times.10 mole calculated in terms of molybdenum in the molybdenum compound, and
Fujiki Kanji
Iida Kazunori
Imori Toru
Nakane Shinsuke
Uchino Osamu
Bridgestone Corporation
Japan Energy Corporation
Nutter Nathan M.
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