Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-03-18
1986-05-27
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525289, 525292, 525297, 525301, C08F27102, C08F27700, C08F25902
Patent
active
045916187
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. TECHNICAL FIELD
This invention relates to a novel anaerobic adhesive composition. More particularly, this invention relates to an anaerobic adhesive composition which is useful in bonding various adherends such as metals, plastics, FRP, glass, etc.
2. BACKGROUND ART
In these years, adhesives which are quickly curable at room temperature without the need for troublesome handling such as quantitative mixing have made a great advance. Particularly, anaerobic adhesives comprising an acrylate or methacrylate as one component, rubber-modified acryl adhesives of the first generation, rubber-modified acryl adhesives of the second generation (to be abbreviated as SGA), and the like appeared in succession.
Japanese Patent Application Publication No. 29-3348 discloses that an ester such as tetraethylene glycol dimethacrylate quickly cures under anaerobic conditions. Such adhesives capable of polymerizing and curing under anaerobic conditions are called anaerobic adhesives and commercially recommended for use in thread locking, shaft fitting and similar purposes. A further advance resulted in an anaerobic adhesive which found a structural application. When used in structural application, these anaerobic adhesives, however, have many problems in that they are expensive and poor in water and heat resistance, their gap-filling properties are generally low, and a squeeze-out portion does not cure and remains tacky, causing impediments to aesthetic appearance and application.
Also, Japanese Patent Application Publication No. 53-41699 discloses a composition based on a high-molecular weight material having a chlorosulfonyl group on its side chain and a polymerizable vinyl monomer and further comprising additional agents such as a radical forming agent, accelerator, etc., which composition is an adhesive quickly curable at room temperature. This composition appeared in the market as SAGA. Although this adhesive has many features in that it cures at room temperature, it is not necessary to mix metered amounts of two components as common room temperature curable epoxy adhesives often require, and it has high bond strength and impact resistance, it is still insufficient in heat resistance, retention of adhesion at high temperatures, fatigue resistance, tensile bond strength, and the like.
SUMMARY OF INVENTION
As a result of extensive investigations to provide an anaerobic adhesive composition free of the above-mentioned shortcomings, the inventors have discovered that an anaerobic adhesive composition formulated by incorporating a polymerizable organic acid or a polymerizable organic acid and a vinyl monomer into a composition consisting of at least one polymerization catalyst and a polymer having a polymerizable side chain and a molecular weight of at least 500 exhibits substantially improved characteristics including heat resistance, retention of adhesion at high temperatures, tensile bond strength, fatigue resistance at bonded joints, and non-tackiness of squeezed-out adhesive, completing the present invention.
Accordingly, it is an object of the present invention to provide a novel anaerobic adhesive composition which has improved shear bond strength and tensile bond strength, and good water, heat, and fatigue resistances, and exhibits no tackiness when squeezed out.
According to the present invention, there is provided an anaerobic adhesive composition which is formulated by incorporating into a composition consisting of a polymer having a polymerizable side chain and a molecular weight of at least 500 and at least one polymerization catalyst, an organic acid having a vinyl or methacryl group and polymerizable with said composition, achieving the above object.
In a preferred embodiment of the present invention, the composition further comprises a vinyl monomer in addition to the above-mentioned components.
The above and other objects, features, and advantages of the present invention will become more apparent from the following description.
BEST MODE FOR CARRYING OUT THE INVENTION
The anaerobic adhesi
REFERENCES:
patent: 3542587 (1970-11-01), Aronoff
patent: 3887653 (1975-06-01), Konishi et al.
patent: 4065521 (1977-12-01), Tachowicz et al.
Fukuura Yukio
Fuse Tadashi
Ishikawa Hikaru
Naito Kazuo
Tanuma Itsuo
Bridgestone Tire Co. Ltd.
Kulkosky Peter F.
Schofer Joseph L.
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