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
1998-11-10
2000-11-14
Cain, Edward J.
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...
524449, C08K 300
Patent
active
06147150&
DESCRIPTION:
BRIEF SUMMARY
This application is at national stage application, according to Chapter II of the Patent Cooperation Treaty.
1. Field of the Invention
This invention generally relates to a vibration damping coating for use on vehicles, interior trims, construction materials, home electric appliances and others to absorb and damp vibratory energy generated thereby or passing therethrough.
2. Background Art
Conventionally, vibration damping sheets are used on vehicles, interior trims, construction materials, home electric appliances and others to absorb and damp vibratory energy generated thereby or passing therethrough.
Such a sheet need be cut to pieces of a desired size and dimension, which are applied with an adhesive onto a portion of vibratory body where damping of vibration is desired. It is very time consuming to provide such cutting and adhering application, in particular when the surface of the portion is substantially curbed or hard to access. The sheet piece applied on a curbed surface may easily peel off.
It has also been proposed to prepare a vibration damping coating material using a viscous/elastic polymer such as a rubber or plastic material or asphalt material as a base component, in which a vibration damping promoter such as mica flakes is blended. Such a resin material can be conveniently applied on a desired surface by spraying means, eliminating said cutting and adhering processes. Even a curbed surface or narrow portion can be easily coated. Robotization of the spraying process is possible as well.
However, it was not practical to apply such a conventional coating material on a surface for a thickness over three (3) millimeters, as can be understood by a person skilled in the art. Accordingly, conventional vibration damping coating materials cannot provide adequate or desired damping of vibration energy.
Such a conventional coating material when applied "thick" on a curbed surface as shown in FIG. 7 will crack or peel sooner or later when subjected to repeated vibrations.
Accordingly, it is an object of the present invention to provide a vibration damping coating that can provide an excellent vibration damping property without cracking or peeling even when applied on a curbed surface.
SUMMARY OF THE INVENTION
The present invention is described in full in the following. The invention provides a vibration damping coating to be used on a number of objects, e.g. a vehicle, interior trim, construction material and electric appliance. The vibration damping coating of the present invention includes, as measured in a dried state, 30 to 90% by weight in combination of mica flakes and calcium carbonate, whose relative ratio is 75/25 to 0/100.
Preferably, the filming material or base material of the coating is a polymer material or a blend of polymer materials that provide a glass transition point -20 to 80.degree. C., or more advantageously 0 to 40.degree. C. Such polymer materials may be acrylic esters or metacrylic esters, or their selective combinations, or selective combinations of acrylic esters or metacrylic esters and styrene, or acryl-styrene copolymers. The base material may also contain di-2-ethylhexyl phthalate (DOP), dibutyl phthalate (DBP), and/or diisononyl phthalate (DINP), and/or a crosslinking agent.
Polyurethane and/or asphalt materials may also be utilized for the coating of the invention.
Easiness of handling and molding, availability and cost of ingredient materials, temperature property such as heat resistance or resistance against coldness, and weather resistance should be taken into due consideration. Applicable temperature ranges and ways of use of the vibration damping coating should also be taken into consideration.
Mica flakes can significantly improve the vibration damping capability of the vibration damping coating. The average aspect ratio by weight of mica flakes to be used is preferably 20 to 60. More preferably, the average aspect ratio is 30 to 40. Mica flakes with an aspect ratio below 20 would not provide a satisfactory vibration damping, while an aspect ratio over 60 wou
REFERENCES:
patent: 4444937 (1984-04-01), Badertsher
patent: 4657963 (1987-04-01), Matsumoto et al.
Muto Masamitsu
Ohira Yasuyuki
Cain Edward J.
Shishiai-Kabushikigaisha
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