Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-06-11
1999-01-26
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08L 5300, C09J 406
Patent
active
058639870
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an adhesive composition, and more particularly to an adhesive composition capable of firmly adhering a polyester material or the like to rubber.
Furthermore, this invention relates to a pneumatic tire, and more particularly to a pneumatic tire using a polyester cords as a reinforcement.
BACKGROUND ART
A polyester material having an ester bond in its main chain is a linear polymer represented by polyethylene terephthalate and is high in the initial modulus, excellent in the dimensional stability under heating and in the cost, so that it is very useful as a reinforcement for rubber articles such as tire, belt, air spring, rubber hose and the like in forms of filament, cord, cable, cord fabric, canvas and the like.
However, when the polyester material is used as a reinforcement for such rubber articles, since the polyester material is minute in the molecular structure and less in the number of functional groups, adhesion to rubber to rubber is insufficiently obtained by an adhesive composition, effective for adhering materials such as nylon rayon or the like and rubber, comprising a resorcin-formaldehyde condensate obtained by a resol-forming reaction and a rubber latex including vinylpyridine-styrene-butadiene terpolymer.
For this end, there have formerly and numerously been proposed a method wherein surface of a polyester cord is subjected to an alkali-amine treatment to increase the number of an active group such as --OH, --COOH, --NH.sub.2 or the like on the surface, a method wherein a compound having a functional group which is capable of a hydrogen bonding or a primary bonding is introduced onto the surface of the polyester cord using an isocyanate compound or an epoxy compound and then treated with an adhesive solution, and such adhesive compositions.
However, the strength of the polyester cord is degraded by the alkali-amine treatment.
Further, the isocyanate compound or the epoxy compound is high in reactivity and reacts with water as a solvent of the adhesive solution or resorcin-formaldehyde condensate in the adhesive solution, so that it is very difficult to provide an adhesive solution of one package composition and also the adhesion property is damaged. For this end, it is required to divide the adhesion treating step into two stages and hence extra installations and steps are necessary, which are unfavorable from a viewpoint of resource-saving and energy-saving.
Also, the treatment with the isocyanate compound or the epoxy compound is unfavorable from a viewpoint of environmental conservation because of the scattering of these compounds into air during the adhesion treatment, and of injurious effect of fumes and steam created during the heat treatment upon humans, and the like.
Moreover, the polyester cord treated with the isocyanate compound or the epoxy compound is hardened and the handling thereof is difficult in production. In addition, there is a most serious problem that when such a polyester cord is used at a high temperature under a high strain, there are caused rapid deterioration of adhesion and degradation of cord strength. Hence the service life of an rubber article using such a cord as a reinforcing material lowers considerably.
As reasons of these phenomena, there can be mentioned facts that since the isocyanate compound or the epoxy compound is primarily bonded to the polyester surface to thereby form a kind of graft polymer on the surface, the adhesion breakage of the bonded portion is easily caused by hydrolysis of polyester, aminolysis with a residue of vulcanizing agent in a rubber composition and the like in use at a high temperature, and that the bonded portion is weak to mechanical input due to the large difference of rigidity between surface and inside of the polyester under high strain, and the like.
For the weight reduction has been proceeded from a viewpoint of energy-saving, and hence it is necessary to further improve the stability and fatigue life to thermal input and mechanical input as compared with the conventional ones. From this rea
REFERENCES:
patent: 4376854 (1983-03-01), Yamaguchi et al.
Nakamura Masaaki
Sasaki Kozo
Bridgestone Corporation
Cheng Wu C.
Schofer Joseph L.
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