Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-09-14
1997-12-23
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524345, 524346, 5253263, 5253593, C08F 818
Patent
active
057008612
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
1. Fields of the Invention
The present invention relates to a fluororubber coating composition and a method for modifying a surface of a substrate. Particularly, it relates to a fluororubber coating composition based on a fluororubber and a method for modifying a surface of a substrate by the use of said composition.
2. Related Art
A fluororubber having rubber-like elasticity and having excellent chemical resistance and thermal resistance is used in various fields. A surface of an article which is frequently contacted with a chemical substance, such as a fixing roller of a copy machine, is required to have high non-tackiness (namely, water-repellency and oil-repellency). Usual fluororubbers have insufficient non-tackiness. Therefore, the improvement of the non-tackiness is attempted.
For example, it is attempted that a fluororesin such as polytetrafluoroethylene (PTFE), a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer (PFA), a tetrafluoroethylene/hexafluoropropylene copolymer (FEP) is added to the fluororubber to improve the non-tackiness by the utilization of the non-tackiness of the fluororesin. However, the modified fluororubber has poor gloss, high grittiness and cracks due to the particle diameter and high melting point of the fluororesin. A fluororubber matrix may have deterioration of properties due to penetration of a liquid agent through the cracks.
There is a method for giving the non-tackiness in which usual unmodified fluorooil (or silicone oil) is added to the fluororubber to bleed the fluorooil on the matrix surface. In this case, since the fluorooil on the surface is gradually removed by the contact with a solvent solubilizing the fluorooil and other materials, the permanent effect cannot be expected.
Among the fluororubbers, there is a perfluororubber having the excellent non-tackiness. However, it is difficult to prepare a paint comprising the perfluororubber and to have the vulcanization by baking the paint.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a fluororubber coating composition which can give a durable non-tackiness to a substrate without deteriorating the properties of the fluororubber such as elasticity, thermal resistance and chemical resistance.
Another object of the present invention is to provide a method for modifying a surface of a substrate by the use of the fluororubber coating composition.
According to a first aspect, the present invention provides a fluororubber coating composition which comprises chemically bonding to the fluororubber (a) having the --CH.sub.2 -- group in he backbone upon heating;
The fluororubber coating composition is useful particularly as a paint.
According to a second aspect, the present invention provides a method for modifying a surface of a substrate which comprises coating the above composition on the substrate surface and calcining the composition. The method of the present invention can give a durable non-tackiness to the substrate surface.
DETAILED DESCRIPTION OF THE INVENTION
The fluororubber used in the composition of the present invention has the --CH.sub.2 -- group in the backbone. The fluororubber used in the composition of the present invention may be a copolymer of at least one monomer selected from the group consisting of vinylidene fluoride, ethylene and propene (Group 1 ) with at least one monomer selected from the group consisting of tetrafluoroethylene, hexafluoropropene, a fluorine-containing vinyl ether, chlorotrifluoroethylene and pentafluoropropene (Group 2). The monomer of Group 1 gives the --CH.sub.2 -- group in the backbone.
The fluorine-containing vinyl ether is, for example, --O--CF.dbd.CF.sub.2 ##STR1## wherein 0.ltoreq.n.ltoreq.5, and ##STR2## wherein 0.ltoreq.n.ltoreq.5, and the fluorine-containing vinyl ether is not limited to these examples.
The molar ratio of the monomer of Group 1 to the monomer of Group 2 is preferably from 30:70 to 85:15. The molecular weight of the fluororubber is preferably from 5,000 to 200,000.
The composition of the present inve
REFERENCES:
patent: 4894418 (1990-01-01), Strepparola et al.
patent: 5266650 (1993-11-01), Guerra et al.
Terasaka Kiyotaro
Tomihashi Nobuyuki
Daikin Industries Ltd.
Lipman Bernard
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