Use of solvent-, water- and emulsifier-free organo-polysiloxane formulations as lubricants for profiled seals

Abstract

The invention provides for, inter alia, the use of solvent-, water- and emulsifier-free preparations for the friction-reducing coating of rubber profiles, comprising (a) about 0.5 to about 35, preferably about 2 to about 5, parts by weight of a curable siloxane and (b) about 65 to about 99.5, preferably about 95 to about 98, parts by weight of low molecular weight volatile silicone oils and, if appropriate, (c) customary auxiliaries and additives.

1 . A friction-reducing coating for a rubber profile that does not conain a solvent, water or an emulsifier which comprises: 
 (a) about 0.5 to about 35, parts by weight, based upon the total amount of components (a) and (b), of a curable siloxane and    (b) about 65 to about 99.5, parts by weight based upon the total amount of components (a) and (b), of at least one low molecular weight volatile silicone oil of formula (I) and/or a cyclic compound of formula (Ia)                          where    (c) optionally auxiliaries or additives.    
     
     
         2 . A friction-reducing coating according to  claim 1 , which comprises about 2 to 5 parts by weight, based on the total amount of components (a) and (b), of at least one curable siloxane and about 95 to 98 parts by weight, based on the total amount of components (a) and (b), of at least one low molecular weight volatile silicone oil of formula (I) and/or at least one cyclic compound of formula (Ia).  
     
     
         3 . The friction-free coating according to  claim 1  which further comprises a curing catalyst.  
     
     
         4 . The friction-free coating according to  claim 3  wherein the catalyst is hexachloroplatinic (IV) acid 6-hydrate or dibutyltin dilaurate.  
     
     
         5 . The friction-free reducing coating according to  claim 1  wherein the low molecular weight volatile silicone oil is a dimethylpolysiloxane of the formula  
       
         
           
           
               
               
           
         
       
     
     
         6 . The friction-free coating according to  claim 1  wherein the low molecular weight volatile silicone oil is a cyclic polysiloxane of the formula  
       
         
           
           
               
               
           
         
       
     
     
         7 . The friction-free coating according to  claim 1  which comprises. 
 (a) 0.5 to 35, parts by weight, based upon the total amounts of (a) and (b), of a curable siloxane and  
 (b) 65 to 99.5, parts by weight, based upon the total amounts of (a) and (b), of low molecular weight volatile silicone oils of the formula (I) and/or a cyclic compound of the formula (Ia)  
                     
 (c) optionally auxiliaries and additives.  
 
     
     
         8 . The friction-free coating according to  claim 1 , wherein the volatile low molecular weight silicone oil is decamethylpentacyclosiloxane.  
     
     
         9 . The friction-free coating composition which comprises a mixture of linear and cyclic silicone oils.  
     
     
         10 . The friction-reducing coating according to  claim 1  wherein the volatile low molecular weight silicone oil has a flash point of greater than 55° C.  
     
     
         11 . The friction-reducing coating according to  claim 1  which further comprises a cross linker to the formula. 
       (R 2 O) c SiO (4−c)/2 , 
       where 
 R 2  is an alkyl radical and  
 c has a value from 1.8 to 4.  
 
     
     
         12 . The friction coating composition according to  claim 1 , wherein a cyclic compound of formula (Ia) is rpesent and n is a number from 4 to 10.  
     
     
         13 . A profile seal which is coated with the friction-reducing coating according to  claim 1 .  
     
     
         14 . A support which comprise the profile seal according to  claim 12 .  
     
     
         15 . The support according to  claim 13  which is a door or window-frame.  
     
     
         16 . A method for lubricating a rubber profile which comprises applying a friction-free coating according to  claim 1.