Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1987-03-09
1988-11-15
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523155, 523156, C08K 714, C08K 320
Patent
active
047850299
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns a composition of frictional materials for use in brake linings of automobiles or the likes.
BACKGROUND OF THE INVENTION
Heretofore, a mold type composition of frictional material using asbestos as matrix fibers and a phenolic resin as a binder has generally been employed as composition of frictional materials for use in brake linings. This conventional molded type composition of frictional material for use in brake linings contains as a binder an organic substance which is thermally decomposed at high temperature, and therefore fadings, i.e., lowering of the frictional coefficient compared to the required coefficient, are resulted. Recently, the brake linings using glass fibers or aromatic polyamide fibers instead of asbestos have been reported, as disclosed in Japanese Patent Laid-Open Publications Nos. SHOWA 53-130742 and SHOWA 56-16579. Since aromatic polyamide fibers are organic substances as well as a phenolic resin, fadings are resulted when aromatic polyamide fibers are thermally decomposed in braking. Also, Japanese Patent Laid-Open Publication No. SHOWA 57-205473 discloses the cryolite powder is blended in a composition of frictional material for use in brake linings an inorganic grain.
As described above, for the conventional composition of frictional material for use in brake linings containing asbestos as matrix fibers, there has been known such problems that the friction coefficient is substantially low or fadings are resulted when brakes are frequently operated. While, a mold type composition of frictional material for use in brake linings containing aromatic polyamide fibers as matrix fibers and a phenolic resin as a binder, possibly lowers the anti-fading performance because of containing a large quantity of the organic substances.
The object of this invention is to provide a new molded type composition for use in brake linings by using polyparaphenylene terephthalamide as matrix fibers of a superior anti-fading performance and a phenolic resin as a binder in order to exhibit a high friction coefficient and a lower wear ratio.
DISCLOSURE OF THE INVENTION
The feature of the composition of frictional material for use in brake linings according to the present first invention resides in that, matrix fibers are composed of chopped glass fibers and pulped aromatic polyamide fibers, and the blending ratio of said chopped glass fibers to said pulped aromatic polyamide fibers is from 2:3 to 4:1 by volume ratio and the composition ratio of the matrix fibers is from 40 to 60% by volume based on 100% by volume (hereinafter, "%" means by volume unless otherwise specified) of the total composition.
The feature of the composition of frictional material for use in brake linings according to the present second invention resides in that, matrix fibers are composed of chopped glass fibers and pulped aromatic polyamide fibers, the blending ratio of said chopped glass fibers to said pulped aromatic polyamide fibers is from 1:9 to 7:3 by volume ratio and the composition ratio of the matrix fibers is from 30 to 40% based on 100% of the total composition.
The feature of the composition of frictional material for use in brake linings according to the present third invention resides in that, matrix fibers are composed of chopped glass fibers and pulped aromatic polyamide fibers, and blending ratio of the chopped glass fibers to the pulped aromatic polyamide fibers is from 1:9 to 1:1 by volume ratio and the composition ratio of the matrix fibers is from 15 to 30% based on 100% of the total composition.
The chopped glass fibers used in the present invention have from 1 to 6 mm of fiber length and from 5 to 13 um of fiber diameter. The pulped aromatic polyamide fibers constitute, together with the chopped glass fibers, the matrix fibers. The aromatic polyamide fibers are composed of a plurality of linear polymers polymerized from monomers including aromatic monomers through amide couplings. The polymers are extended linearly due to the steric hindrance of atoms cons
REFERENCES:
patent: 3434998 (1969-03-01), Aldrich et al.
patent: 4373038 (1983-02-01), Moraw et al.
patent: 4374211 (1983-02-01), Gallagher et al.
Honma Toru
Kakihara Kenji
Ozawa Makoto
Jacobs Lewis T.
Toyota Jidosha & Kabushiki Kaisha
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