Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-10-22
2000-02-01
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525100, 525105, 525106, 525479, 528 26, 528 34, C08F 3008
Patent
active
06020446&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a curable composition improved in weathering-resistant adhesive property and useful as sealants for double layer glass and building materials or as adhesives, among others.
BACKGROUND ART
It is known that saturated hydrocarbon polymers having at least one silicon-containing group having a hydroxyl or hydrolyzable group bonded to the silicon atom and capable of crosslinking by forming a siloxane bond (hereinafter said silicon-containing group is referred to as "reactive silyl group") have interesting properties in that, even at room temperature, they can be crosslinked through siloxane bond formation involving moisture-caused hydrolysis of the reactive silyl group to give rubber-like cured products. Therefore, they can be effectively used as sealants for double layer glass products and as elastic sealants for building materials, for instance.
Sealants for double layer glass products are required to be excellent in nonprimer adhesive property, namely to be capable of firmly adhering to various adherends without applying any primer. In recent years, it has been demanded that not only sealants for double layer glass products but also sealants for building materials be capable of firmly adhering to adherends in the nonprimer state so that the efficiency on the side of constructors can be improved. However, when the above-mentioned reactive silyl group-containing saturated hydrocarbon polymers are used, the adhesive property in the nonprimer state is unsatisfactory.
Furthermore, it is required that sealants to be used around or in contact with glass, for example sealants for double layer glass products be excellent especially in weathering-resistant adhesive property. However, when the above-mentioned reactive silyl group-containing saturated hydrocarbon polymers are used, they show rather unsatisfactory weathering-resistant adhesive property. In particular, they have a problem in that they are insufficient in weathering-resistant adhesive property especially when used in heat ray-reflecting glass products recently used in many instances and showing high heat insulation characteristics.
SUMMARY OF THE INVENTION
It is an object of the invention to improve the adhesive property of a curable composition mainly comprising a reactive silyl group-containing saturated hydrocarbon polymer when applied to various adherends and to improve the weathering-resistant adhesive property of said composition when applied to various glass products, in particular heat ray-reflecting glass products.
The present inventors made intensive investigations in an attempt to solve such problems and, as a result, found that the adhesive property and weathering-resistant adhesive property of such composition can be improved by adding a certain specific compound to the polymer, without deteriorating or otherwise adversely affecting the physical properties of the cured product. The problems mentioned above have thus been solved and the present invention has now been completed.
Thus, the present invention relates to a curable composition which comprises (A) a saturated hydrocarbon polymer containing at least one reactive silyl group, (B) a silane coupling agent and (C) a compound containing, within the molecule thereof, an unsaturated group capable of polymerizing upon reaction with atmospheric oxygen and/or a photopolymerizing substance. In particular, it relates to a curable composition improved in weathering-resistant adhesive property which comprises (A) 100 parts by weight of a saturated hydrocarbon polymer containing, within the molecule thereof, at least one reactive silyl group and having a molecular weight of 500 to 50,000, (B) 0.1 to 20 parts by weight of an isocyanate group-containing silane coupling agent and/or an epoxy group-containing silane coupling agent and (C) 0.1 to 20 parts by weight of a drying oil and/or a photopolymerizing substance.
DETAILED DESCRIPTION OF THE INVENTION
In the following, the present invention is described in detail.
The reactive silyl group-conta
REFERENCES:
patent: 5106908 (1992-04-01), Alsmarraie et al.
patent: 5731379 (1998-03-01), Kennan et al.
Chiba Makoto
Okamoto Toshihiko
Sakaguchi Masashi
Takase Junji
Kaneka Corporation
Marquis Melvyn I.
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