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
1994-03-23
1996-10-29
Michl, Paul R.
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...
524398, 524431, C08J 300, C08K 310, C08L 3104
Patent
active
055696953
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL APPLICATION FIELD
The present invention relates to a self-fusion type damping material having excellent self-fusibility and a high damping effect. The main application fields thereof are vehicle, marine vessel, electric apparatus, machinery, architecture, building material, and the like.
PRIOR ART
As is generally known, a damping material is widely used in various fields to prevent and suppress vibration and noise generated due to rotation of an engine, a motor, etc. used in electric and mechanical apparatus, such as a vehicle, for instance, automobile or electric train, marine vessel, laundry machine, dryer, acoustic instrument, precision machine tool, or plant equipment; vibration and noise generated with pipes and conduits of water, gas, etc. or with ducts for air conditioning, etc. equipped in building, house, etc.; and vibration generated at the time a vehicle travels on a road or railroad.
Generally speaking, a damping material is manufactured by forming a filler, such as mica powder, with a binding material into a sheet or block by a molding method such as extrusion molding, calendering, compression molding, injection molding or cast molding. Specifically, a sheet form damping material is often used by applying through heat fusion or adhering on a substrate, such as a steel plate.
Recently, the vehicle, marine vessel, electric and mechanical apparatus, architecture, building material, and the like tend to be lighter in weight and smaller in size, and a damping material to be used therein correspondingly needs to be lighter, thinner and smaller. Accordingly, the damping material is strongly required to have a high damping effect.
Further, when a damping material is mounted on a substrate, it is necessary that the material has excellent applicability and workability, such as, easy handling, easy mounting and the like. For that end, it is strongly required that the material has excellent adhesion to a substrate: in other words, the material should be excellent at adhering firmly to the substrate, namely adhesion strength, and at being sufficiently fitted to an uneven surface or a complex shape of the substrate, that is adaptability.
When a damping material is mounted on a ceiling or vertical part, a method using an adhesive or an adhesive double coated tape, or a method comprising applying hot melt on the surface on which the material is to be mounted and then subjecting the hot melt to the heat fusion has generally been utilized. However, when the former method is used, a release paper added to the adherent surface must be peeled off upon application thereof and accordingly it is inconvenient to handle. In the latter method, the damping material should be adhered through heat fusion while continually taking care to prevent the material from sagging or dropping out and this has caused reduction of the applicability and workability.
A method has been proposed and brought into practice in which hard ferrite powder is used as a filler, a damping material is then formed from the filler with a binder and magnetized so that magnetic adsorption force is imparted to the material, hereinafter referred to as "self-fusion type damping material", which is placed on a predetermined position with the aid of the magnetic adsorption force in such a manner as to prevent the material from being dislocated or sagging, followed by heat fusion.
The self-fusion type damping material must have sufficient magnetic adsorption to suppress and prevent its dislocation and sagging. Further, the material is required to have not only the above-described adhesion properties such as adhesion strength and adaptability but also excellent heat fusibility when it is adhered through heat fusion.
Conventionally known self-fusion type damping materials include damping materials manufactured by forming a magnetic material having high residual magnetism, such as barium ferrite powder or strontium ferrite powder, with a fusible bituminous material [Japanese Patent Publication (KOKOKU) No. 42-9880 (1967)] and by forming a magnetic
REFERENCES:
patent: 5260367 (1993-11-01), Toda et al.
patent: 5350793 (1994-09-01), Kishimoto et al.
Fujii Yasuhiko
Fujii, deceased Takashi
Kishimoto Atsunori
Ohshita Kazutaka
Toda Tetsuro
Hirotani Co. Ltd.
Michl Paul R.
Niland Patrick
Toda Kogyo Corp.
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