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  Damping material resin compositions, damping materials, restraining-type damping members, and use thereofRelated Patent Categories: Acoustics, Sound-modifying Means, Muffler, Fluid Conducting Type, With Sound Absorbing MaterialDamping material resin compositions, damping materials, restraining-type damping members, and use thereof description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070012509, Damping material resin compositions, damping materials, restraining-type damping members, and use thereof. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application is a continuation-in-part application of International Application PCT/JP2004/019188 (not published in English) filed Dec. 22, 2004. TECHNICAL FIELD [0002] The present invention relates to damping members of the restraining type suited, for example, to use in houses, apartment buildings, office building and like residential buildings, expressway, elevated bridges, railroad tracks and various like structures, motor vehicles, railroad cars, vessels and various vehicles, and also in household electric appliances and office automation appliances, for diminishing the vibration or oscillation and noise to be produced, damping material resin compositions for preparing such damping members, and damping materials comprising the composition. BACKGROUND ART [0003] The loss modulus (E'') of a material as divided by the storage modulus (E') thereof, i.e., loss tangent (tan 67 =E''/E'), has heretofore been used as an indicator of the damping properties of the material. The greater the loss tangent, the higher the vibration absorbing properties of the material. Damping materials are generally considered excellent when exceeding 1 in the value of loss tangent. However, further improvements in damping properties are desired, and there is a demand for materials which are over 3 in loss tangent. [0004] In connection with the above, Patent Literature 1 discloses a damping material comprising a polymer having a polar group and a chlorinated paraffin or liquid rubber admixed with the polymer. [0005] However, the disclosed material is about 1.3 to about 2.8 in loss tangent (tan.delta.) and is not always fully satisfactory in damping properties. [0006] The research conducted by the present inventors has revealed that when an increased amount of chlorinated paraffin or liquid rubber is incorporated into the damping material in an attempt to improve the loss tangent, the resulting material becomes insufficient in strength to entail the likelihood that the damping material will encounter difficulty in retaining its shape, for example, if exposed to heat. Patent Literature 1: JP1999-80562A1 DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention [0007] In view of the problem of the conventional damping materials, an object of the present invention is to provide a damping material resin composition and a damping material exhibiting high damping properties and suitable for diminishing vibration or oscillation, a damping member of the restraining type comprising the damping material, and the use thereof. Means for Solving the Problem [0008] As a first feature of the present invention, the invention provides a damping material resin composition comprising 100 parts by weight of a thermoplastic resin having a chlorine content of 20 to 70 wt. % and a weight average molecular weight of at least 400,000, and 100 to 1000 parts by weight, preferably 200 to 1000 parts by weight, of a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and 12 to 50 carbon atoms. [0009] The present invention provides, as a second feature thereof, a damping material resin composition comprising 100 parts by weight of a thermoplastic resin having a chlorine content of 20 to 70 wt. %, 200 to 1000 parts by weight of a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and a number average carbon atom number of 12 to 50 and 300 to 1000 parts by weight of an inorganic filler. [0010] The present invention provides, as a third feature thereof, a damping material resin composition comprising a thermoplastic resin having a chlorine content of 20 to 70 wt. % and a degree of crystallinity of at least 5 J/g as measured by DSC, and a chlorinated paraffin having a chlorine content of 30 to 75 wt. % and 12 to 50 carbon atoms. [0011] The present invention provides, as a fourth feature thereof, a damping material resin composition according to any one of the first to third features of the invention wherein the chlorinated paraffin contains 10 to 70 wt. % of a chlorinated paraffin having a chlorine content of at least 70 wt. %. [0012] The present invention provides, as a fifth feature thereof, a damping material comprising a damping material resin composition according to any one of the first to third features of the invention. [0013] The present invention provides, as a sixth feature thereof, a damping laminate comprising a damping material according to the fifth feature of the invention, and a restraining member laminated to one surface of the damping material. [0014] The present invention provides, as a seventh feature thereof, a damping member of the restraining type comprising a damping material according to the fifth feature of the invention, a restraining member laminated to one surface of the damping material, and an adhesive resin layer laminated to the other surface of the damping material. [0015] The present invention provides, as an eighth feature thereof, a damping member of the restraining type according to the seventh feature of the invention wherein the difference between the glass transition temperature (hereinafter referred to as "Tg") of the damping resin layer and the Tg of the adhesive resin layer is at least 10.degree. C. [0016] The present invention provides, as a ninth feature thereof, a damping member of the restraining type according to the seventh feature of the invention wherein a plasticizer migration preventing film is interposed between the damping resin layer and the adhesive resin layer so as to separate these layers, and the difference between the SP value of the film and the SP value of all components having a melting point of up to 80.degree. C. and included among the components of the damping resin layer and the adhesive resin layer is at least 1. [0017] The present invention provides, as a tenth feature thereof, a damping member of the restraining type according to the sixth feature of the invention wherein the restraining layer is coated with a primer at least over the surface thereof adjacent to the restraining resin layer. [0018] The present invention provides, as an eleventh feature thereof, a damping structure wherein a restraining-type damping member according to the tenth feature of the invention is affixed to a rough surface of a vibrating or oscillating body. Continue reading about Damping material resin compositions, damping materials, restraining-type damping members, and use thereof... Full patent description for Damping material resin compositions, damping materials, restraining-type damping members, and use thereof Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Damping material resin compositions, damping materials, restraining-type damping members, and use thereof patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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