Sound deadener composition with emulsion polymer and fluorinated compound

Abstract

A description is given of a sound deadener composition comprising a polymer dispersion comprising (a) at least one water-dispersed polymer obtainable by emulsion polymerization of free-radically polymerizable monomers and having a glass transition temperature in the range from −60 to +60° C.; (b) inorganic fillers; and (c) at least one fluorinated compound selected from perfluoroalkyl-substituted carboxylic acids and their salts, fluorocarbon resins, surface-active, fluoroaliphatic polymeric esters, and fluorine-containing, acrylate-based copolymers. A description is also given of a method for damping oscillations or vibrations of components of vehicles and machines, using the sound deadener composition of the invention.

1 . A sound deadener composition comprising
 (a) at least one water-dispersed polymer obtainable by emulsion polymerization of free-radically polymerizable monomers and having a glass transition temperature in the range from −60 to +60° C.;   (b) inorganic fillers; and   (c) at least one fluorinated compound selected from the group consisting of perfluoroalkyl-substituted carboxylic acids and their salts, fluorocarbon resins, surface-active, fluoroaliphatic polymeric esters, and fluorine-containing, acrylate-based copolymers.   
     
     
         2 . The sound deadener composition according to the preceding claim, wherein the fluorinated compound is selected from the group consisting of perfluoroalkyl-substituted carboxylic acids and salts thereof. 
     
     
         3 . The sound deadener composition according to either of the preceding claims, wherein the perfluoroalkyl-substituted carboxylic acid and salts thereof have at least one or two perfluoroalkyl groups of the formula —C n CF 2n+1 , where the perfluoroalkyl groups are linear or branched, n is a number from 1 to 16, and the salts are selected from ammonium salts, alkali metal salts, and alkaline earth metal salts. 
     
     
         4 . The sound deadener composition according to any of the preceding claims, wherein the polymer (a) is selected from acrylate homopolymers, acrylate copolymers, and acrylate polymer blends. 
     
     
         5 . The sound deadener composition according to any of the preceding claims, wherein the fluorinated compound is present in an amount of 0.1% to 3% by weight. 
     
     
         6 . The sound deadener composition according to any of the preceding claims, wherein the glass transition temperature of the polymer prepared by emulsion polymerization is in the range from −30° C. to less than or equal to +60° C. 
     
     
         7 . The sound deadener composition according to any of the preceding claims, wherein the polymer prepared by emulsion polymerization is composed of at least 60% by weight of principal monomers selected from C 1  to C 20  alkyl (meth)acrylates, vinyl esters of carboxylic acids comprising up to 20 C atoms, vinylaromatics having up to 20 C atoms, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of alcohols comprising 1 to 10 C atoms, aliphatic hydrocarbons having 2 to 8 C atoms and one or two double bonds, or mixtures of these monomers. 
     
     
         8 . The sound deadener composition according to any of the preceding claims, wherein the polymer is composed of at least 60% by weight of C 1  to C 10  alkyl (meth)acrylates. 
     
     
         9 . The sound deadener composition according to any of the preceding claims, wherein the polymer has a core-shell morphology or is preparable by at least two-stage polymerization, the glass transition temperature of the core-forming polymer being different by at least 10° C. than the glass transition temperature of the shell-forming polymer, or the glass transition temperature of the polymer formed in the first polymerization stage being different by at least 10° C. than the glass transition temperature of the polymer formed in the second polymerization stage. 
     
     
         10 . The sound deadener composition according to any of the preceding claims, comprising
 (a) 5% to 20% by weight of solids of the polymer dispersion,   (b) 40% to 90% by weight of inorganic fillers,   (c) 0.1% to 3% by weight of fluorinated compounds,   (c) 10% to 40% by weight of water, and   (d) 0% to 10% by weight of auxiliaries.   
     
     
         11 . The sound deadener composition according to any one of the preceding claims, wherein the inorganic fillers are selected from kaolin, chalk, microdolomite, finely ground quartz, and mica, and the auxiliaries are used at not less than 0.1% by weight and are selected from thickeners, resins, plasticizers, and pigment dispersants. 
     
     
         12 . The use of a sound deadener composition according to any of the preceding claims for vibration damping of vehicle bodywork parts. 
     
     
         13 . A method for damping oscillations or vibrations of vehicle or machine components, where
 (1) a sound deadener composition according to any of  claims 1  to  11 , is provided, and   (2) the sound deadener composition is applied to a vehicle or machine component and dried.