A sound dampening glazing, for example an automotive windshield, in one embodiment of the invention includes a pair of glass sheets having facilities therebetween. In cross section and moving from one glass sheet to the other, the facilities include a polyvinyl butyral sheet, an intermediate sheet having a surface harder than the surface of the interlayer to smooth the interlayer surface e.g. an intermediate polyester sheet, a sheet of dampening material, a polyester sheet, a polyvinyl butyral sheet. In another embodiment, the automotive windshield has two sheets of dampening material, the sheets have sound dampening properties in different temperature ranges to as to provide the automotive windshield with sound dampening properties over a wider temperature range. Methods for making the glazings of the instant invention are also disclosed.

Sound absorbing article and method of making same

A light-weight sound absorbing and insulating plastic sheet material which exhibits an excellent sound absorbing and insulating effect even in the low- and medium-pitched sound range for use in building materials and sound-proof walls and a sound absorbing and insulating plastic panel using the plastic sheet material are provided. The sound absorbing and insulating plastic sheet material of the present invention comprises a plastic sheet-formed substance and magnetic fluid-enclosing capsules contained in the sheet-formed substance. The sound absorbing and insulating plastic panel of the present invention comprises the above-mentioned sound absorbing and insulating plastic sheet material and a fiber-reinforced plastic sheet bound to at least one side of the sheet material. The sound absorbing and insulating plastic sheet material and the sound absorbing and insulating plastic panel of the present invention are excellent also in electromagnetic wave shielding effect.

Sound absorbing/shielding and electric wave absorbing plastic sheet containing encapsulated magnetic fluid, and sound absorbing/shielding and electric wave absorbing plastic panel

Un traitement anti-vibratoire, pour des corps dont la temperature peut s'elever jusqu'a depasser 150°C environ, utilise un certain nombre d'amortisseurs (1) saillants en porte-a-faux du type en sandwich, qui se composent d'une couche de materiau visco-elastique (3) prise en sandwich entre deux plaques de metal rigides (4, 5), lesquelles sont fixees a un support (2) pouvant lui-meme etre fixe aux corps An anti-vibration treatment for body whose temperature can rise to exceed 150 ° C, uses a number of dampers (1) protruding in cantilever-type sandwich, which consist a layer of viscoelastic material (3) sandwiched between two rigid metal plates (4, 5) which are fixed to a support (2) which can itself be attached to the body Le support (2) est isole thermiquement du corps (7) et est place dans une position d'amplitude elevee a une frequence de rayonnement qui doit etre reduite The support (2) is thermally isolated from the body (7) and is placed in a high amplitude position to a radiation frequency to be reduced

A damping treatment for pipes and bodies.

It has been found that transmission of airborne noise can be inhibited by interposing in the air space between the noise source and the location to be insulated a thin, dense, normally self supporting film or sheet composed essentially of certain ethylene-vinyl acetate copolymers and from about 60 to about 90 percent by weight of inorganic filler materials effective to produce an overall density greater than at least 2 grams per cubic centimeter. The average vinyl acetate content of the ethylene-vinyl acetate copolymer, preferably a mixture or blend of copolymers, must be in the range of from about 10 to about 42 percent by weight of the copolymer ingredient. The normally selfsupporting film or sheet gives a level of sound blocking greater than that expected from calculations according to the Mass Action Law (sometimes referred to as Berger''s Law.

Method for inhibiting transmission of airborne noise

Constrained layer damping structures are often based on viscoelastic layers of iso-octyl acrylate:acrylic acid or analogous copolymers. As the acrylic acid content is increased, the peak damping temperature also increases; unfortunately, however, the copolymer becomes more brittle and susceptible to shock, especially at low temperatures. Incorporating small amounts of rubbery polymer particles (especially core-shell polymers) in the viscoelastic copolymer alleviates this problem.

Vibration damper having extended temperature range and low temperature shock resistance

Vibration damped sandwich systems having an improved damping effect within a broad range of temperature and consisting of hard plates and a vibration damping interlayer, said interlayer comprising a copolymer of ethylene, vinyl acetate, ethyl-acrylate and acrylic and/or methacrylic acid.

Oberst Hermann

Papers

Vibration damped sandwich systems having interlayers of vinyl acetate-ethylene-n-butylacrylate copolymers

Process for the manufacture of copolymers having an extremely heterogeneous structure