Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Reexamination Certificate
1998-08-13
2002-10-22
Weisberger, Richard (Department: 1774)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
C428S373000, C428S375000, C428S378000, C428S407000, C428S461000, C428S113000, C428S105000, C428S295400, C428S357000, C428S359000, C428S367000, C428S372000, C442S172000, C442S180000, C156S137000, C156S307300, C156S330000, C156S333000, C156S910000, C156S407000
Reexamination Certificate
active
06468654
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a glass fiber coating composition, a rubber-reinforcing glass fiber product coated with the coating composition, and a rubber article such as a rubber belt, a tire and the like, formed using the glass fiber product as a reinforcing material, and a process for treating the glass fiber.
BACKGROUND ART
Reinforcing fibers such as a glass fiber have been conventionally widely used as a reinforcing material for rubber articles such as a rubber belt, a tire and the like.
The rubber articles such as the rubber belt may be repeatedly subjected to a flexing stress to cause a flex fatigue, resulting in a reduced performance, a peel-off between the reinforcing material and a rubber matrix and a wearing of the reinforcing fiber. Further, the strength is liable to be reduced. Such phenomena tend to be particularly accelerated by a heat and water. In order to prevent a peel-off due to such a flex fatigue and to provide a sufficient reinforcing effect, it is necessary to increase the conformity and adhesion between the reinforcing fiber and the rubber and to provide the rubber article with heat and water resistances. For this purpose, various treating agents may be applied onto the surface of the reinforcing fiber.
For example, in Japanese Patent Application Laid-open No. 221433/89, a treating agent has been proposed which employs, in combination, a water-soluble resorcinol-formaldehyde condensate, a vinylpyridine/butadiene/styrene terpolymer latex, a dicarboxylated butadiene/styrene copolymer latex and a chlorosulfonated polyethylene latex.
The use of such a treating agent makes it possible to satisfy the adhesion between the reinforcing fiber and the rubber matrix and the heat and flex resistances of the treating agent itself to a certain extent, but is accompanied by a disadvantage that when a reinforcing fiber coated with such treating agent is used, sufficiently satisfactory heat, water and flex resistances cannot be obtained because of a insufficient water resistance of the treating agent itself and hence, it is difficult to provide an excellent rubber article.
The present inventors have previously invented and proposed a rubber-reinforcing glass fiber cord coated with a composition consisting essentially of a water-soluble resorcinol/formaldehyde condensate having an improved adhesive strength to a heat-resistant rubber, and a nitrile group-containing highly saturated polymer rubber having an iodine value of 120 or less (see Japanese Patent Application Laid-open No. 270877/88). This invention and proposal have been accomplished by finding that the strength of a rubber film and the adhesive strength to the matrix rubber are enhanced by using a nitrile group-containing highly saturated polymer rubber having an iodine value of 120 or less, preferably 0 to 100.
Even in the above-described invention by the present inventors, a scope for improvement for water and flex resistances has been left.
It is an object of the present invention to provide a reinforcing fiber product in which the disadvantages associated with the prior art are overcome, and which exhibits a large bonding force between a reinforcing fiber and a rubber matrix, and which cannot be reduced in strength, even if it is repeatedly subjected to a flexing stress, and which cannot produce a peel-off between the reinforcing fiber product and the rubber matrix and moreover, has sufficient heat and water resistances.
DISCLOSURE OF THE INVENTION
The present invention embraces following aspects (1) to (7):
(1) A glass fiber coating composition comprising a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively.
(2) A rubber-reinforcing glass fiber product which is coated with a treating agent comprising a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively.
(3) A rubber-reinforcing glass fiber product, which is coated with a treating agent comprising a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively, and which is further coated with a halogen-containing polymer-based adhesive solution.
(4) A rubber article made using a glass fiber product which is coated with a treating agent comprising a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively.
(5) A rubber article made using a glass fiber product which is coated with a treating agent comprising a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively, and which is further coated with a halogen-containing polymer-based adhesive solution.
(6) A process for coating a rubber-reinforcing glass fiber product, comprising the step of coating the rubber-reinforcing glass fiber product with a treating agent which comprises a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively.
(7) A process for coating a rubber-reinforcing glass fiber product, comprising the steps of coating the rubber-reinforcing glass fiber product with a treating agent which comprises a nitrile group-containing highly saturated polymer rubber latex (A) having an iodine value of 120 or less, a rubber latex (B) other than the highly saturated polymer rubber latex, and a water-soluble resorcinol/formaldehyde condensate in amounts of 15 to 80%, 5 to 70% and 2 to 15%, all by weight in terms of solids, respectively, and coating the resulting product with a halogen-containing polymer-based adhesive solution.
The present invention will now be described in further detail.
The nitrile group-containing highly saturated polymer rubber latex (A) used in the present invention is required to have an iodine value of 120 or less, preferably, in a range of 0 to 100 from the viewpoints of strength of a rubber film and adhesive strength to the matrix rubber. A preferred example of the latex which may be used is Zetpole Latex 2020 (which has an iodine value of 28, and which is made by Nippon Zeon Co., Corp.). It should be noted that the iodine value was determined according to JIS K0070. The nitrile group-containing highly saturated polymer rubbers (A) includes a rubber made by hydrogenating a conjugated diene unit moiety of an unsaturated nitrile/conjugated diene copolymer rubbers; an unsaturated nitrile/conjugated diene/ethylenically unsaturated monomer tridimensional copolymer rubber and the derivatives made by hydrogenation thereof; an unsaturated nitrile/ethylenically unsaturated monomer based copolymer rubber. The unsaturated nitrile/ethylenically unsaturated monomer based copolymer rubber may be a rubber made by substituting a portion of the unsaturated monomer by
Okamura Akira
Sekiguchi Masato
Lorusso & Loud
Nippon Glass Fiber Co., Ltd.
Weisberger Richard
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