Stock material or miscellaneous articles – Composite – Of silicon containing
Patent
1998-05-26
2000-02-15
Dawson, Robert
Stock material or miscellaneous articles
Composite
Of silicon containing
524588, 524837, 10628712, B32B 904
Patent
active
060250771
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a composition of silicone emulsion coating material capable of forming a film excellent in the weatherability, durability and so on and to a method for manufacturing such composition. It is also possible to obtain an excellent hardened coating by coating a proper organic coating substrate with such composition of silicone emulsion coating material, and resultant coated products having the hardened film will be also extremely useful.
BACKGROUND ART
Since organic solvent series coatings discharge to the atmosphere their diluting organic solvent upon being used, they are regarded as one of important factors of global environmental problem. As a countermeasure therefor, water is employed as the diluting agent instead of the organic solvent, and emulsion coating materials emulsified through an emulsifying agent are employed.
For the emulsion coating material, ones of acrylics, urethanes and acryl silicones will form a main current. However, the coating of such emulsion coating material is deteriorated in the weatherability. Accordingly, a provision of an emulsion coating material which can form a film excellent in the weatherability has been demanded.
As the coating basis capable of forming the coating excellent in the weatherability, a reactive silicone compound having at molecular end alkoxide radical or silanol radical has been known. However, the reactive silicone compound could have been present stably within the organic solvent but has been difficult to be kept emulsified for a long term even when the compound is emulsified with water and an emulsifying agent added, since the alkoxide radical or silanol radical of the reactive silicone compound reacts with water for condensation polymerization so as to apt to cause a gelation, precipitation or the like to occur. Due to this, it has been required to control the reactivity of the reactive silicone compound with respect to water, in order to attain the stable emulsification for a long term of the reactive silicone compound.
Accordingly, ones in which silicone oil controlled in the reactivity to water by closing the molecular ends is employed as a coating base material are forming the main current of the silicone emulsion coating material. Since silicone oil is inferior in the reactivity, however, the crosslinking reaction within the coated film is difficult to advance, and any highly durable silicone coating cannot be obtained. Due to this, the silicone emulsion coating material the coating base material of which is silicone oil is mainly employed as a surface treatment material in the field of fabrics only, and cannot be employed as the coating material in the field of coating.
In WPI Acc Publication No. 95-363696/199547, for example, there has been suggested a three-dimensional, crosslinkable, water-dispersed silicone resin composition consisting of (A) polyorganosiloxane resin particulate matter of a softening point 50-250.degree. C., (B) water, (C) an emulsifying agent and (D) an emulsion of a specific polyorganosiloxane containing in 1 molecule at least one of hydroxyl radical or hydrolyzable radical. The particulate matter of polyorganosiloxane employed in this composition is, while not specifically limited, the reactive silicone having silanol radical in the molecule. However, its shape is particulate as being solid, and its molecular weight should preferably be more than 5,000 (Embodiment in the above publication), and the reactivity of the silanol radical with respect to water is considered low. Due to this, it is considered that a stable water-dispersed silicone is enabled. In order to form a hardened coating of this composition, however, it is required to cause to occur a condensation reaction of the silanol radical which is low in the reactivity, and a heat treatment at a high temperature of more than 200.degree. C. is required therefor, so as to be unable to cope with conditions for low temperature hardening. Further, a manufacturing method for this known compound has involved complicated works, in r
REFERENCES:
patent: 4496687 (1985-01-01), Okada et al.
patent: 4769405 (1988-09-01), Kondo et al.
patent: 5188899 (1993-02-01), Matsumoto et al.
Ariga Hideya
Inoue Minoru
Ohashi Akihiko
Seto Kazuo
Yamaki Takeyuki
Dawson Robert
Matsushita Electric & Works Ltd.
Robertson Jeffrey B.
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