Central Glass Company, Limited

Yoshihiro Sugata

Michiharu Mishima

Kaoru Umeya

A vibration damping material which is a composite material comprising an organic polymer as matrix and a flake filler dispersed in the polymer matrix. The orientation of the filler flakes is controlled such that the major surfaces of the individual flakes are at an angle of 0.degree..+-.30.degree. with a predetermined plane. The vibration damping material is used to form a damping layer on a surface of the object of vibration damping. In the case of vibration damping of the extensional type using only the damping layer, the aforementioned plane is parallel to the major surfaces of the damping layer. In the case of providing a constraining layer on the damping layer the aforementioned plane is normal to the major surfaces of the damping layer. The flake filler is usually an inorganic material and may be coated with an organic polymer. This vibration damping material features large values of loss modulus when used in the extensional manner and large values of dynamic loss factor when used in the constrained manner over wide ranges of temperature and frequency.

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Sendai, Japan

Yoshihiro Sugata