Rubber composite

Details Rubber composite Rubber composite

1991-11-18

1993-10-12

Morgan, Kriellion S.

Stock material or miscellaneous articles

Composite

Of polyester

524 96, 524104, 428395, 428327, B32B 2706, C08K 534

Patent

active

052524078

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates mainly to a rubber composite such as tires, belts, hoses, etc. in which polyester high-tenacity fibers for industrial materials are used, and more particularly to a rubber composite to which special additives are added and which is suitable for uses in which said polyester high-tenacity fibers, a reinforcing material for the rubber composite, suffer degradation during use and processing, said degradation being caused by the participation of amines derived from the additives in the rubber.
2. Background Art
Presently used rubber composites with polyester high-tenacity fibers as a reinforcing material, for example tires, have a problem that, when used at high temperatures resulting from their own heat build-up or the temperature of the environment, the polyester high-tenacity fibers, a reinforcing material, have a lower tensile strength and adhesion strength. It has long been recognized that this thermochemical stability in rubber is a serious problem for the polyester fibers, and W. W. Daniels, et al. proposed, as early as 1959, to improve the chemical stability by reducing the content of terminal carboxyl groups to 15 equivalents/10.sup.6 g or less (Japanese Patent Publication No. 5821/1962). After that, a large number of concrete methods for reducing the content of terminal carboxyl groups in the polyester fibers have also been proposed, as shown for example in U.S. Pat. No. 3975329 and Japanese Patent Kokai No. 116816/1980. Further, there have been disclosed techniques of improving the thermochemical stability of the polyester in rubber by removing moisture from rubber composites by incorporating calcium oxide (Japanese Patent Kokai No. 29471/1972) or isatonic anhydride (Japanese Patent Publication No. 36276/1975) in the rubber, or removing amides from rubber composites by incorporating 2-chloro-4,6-diamino-S-triazine (Negodeg PE.TM.) in the rubber (French Patent No. 2066198). In recent years, quite a novel method was disclosed by the present inventors in which the mobility of amorphous chains of the polyester is reduced in order to reduce the permeability of amines in the rubber composite to the polyester (Japanese Patent Kokai No. 224879/1985, 12952/1986 and 146876/1986).


DISCLOSURE OF THE INVENTION

However, according to the inventors' study on the degradation of the polyester in rubber {Yabuki and Sawada, Sen'i Gakkai-shi, Vol. 41, No. 11, T-467 (1985)}, the degradation of the polyester is hydrolysis catalyzed mainly by amines, and the terminal carboxyl groups hardly act as an acid catalyst for the hydrolysis.
(1) Consequently, the techniques to decrease the content of carboxyl groups disclosed in the literature, including Japanese Patent Publication No. 5821/1962, are not so effective to prevent the polyester from degradation.
(2) The techniques to remove moisture from rubber, which are disclosed in Japanese Patent Kokai No. 29471/1972 and Japanese Patent Publication No. 36276/1975, cannot maintain the effect because the moisture of rubber composites is supplied from the outside.
(3) The technique to remove amines disclosed in French Patent No. 2066198 has this effect, although it is a technique which was developed with such mechanism as described in detail in the present invention remaining unknown. It is a matter of regret, however, that when said compound is incorporated in rubber, scorch breaks out to make it difficult to put the rubber to practical use.
(4) The present inventors' prior application (Japanese Patent Kokai No. 224879/1985) is a technique based on a unique idea, but in principle, it has no effect to prevent the thermochemical degradation at the adhesion interface between the polyester surface and rubber, and therefore there is a limitation to the use of this technique.
An object of the present invention is to eliminate the above conventional drawback of rubber composites with polyester high-tenacity fibers as a reinforcing material, i.e. a drawback that the chemical stability of the reinforcing material is poor when th

REFERENCES:
patent: 3900532 (1975-08-01), Dietrich et al.
patent: 3959215 (1976-05-01), Schneider
patent: 4164114 (1979-08-01), Yabuki et al.
patent: 4288361 (1881-09-01), Zestermann et al.
patent: 4409055 (1983-10-01), Elmer
patent: 4460029 (1984-07-01), Schuetz et al.
patent: 4880857 (1989-11-01), Mori et al.

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