Curable compositions consisting of silanes with three hydrolysable groups

Abstract

The invention relates to silane cross-linking curable compositions, comprising a polymer P with at least two terminal groups of the following formulae (I) and (II) -A m -K 1 -SiXYZ (1), -A m -K 2 -SiXYZ (II), and/or two polymers P 1 and P 2 , the polymer P 1 having terminal groups of the following formula (I) -A m -K 1 -SiXYZ (I), and the polymer P 2 having terminal groups of the following formula (II) -A m -K 2 -SiXYZ (II). In said formulae, A represents a bivalent binding group K 1 and K 2 independently of one another represent a bivalent aliphatic hydrocarbon group with a main chain of between 1 and 6 carbon atoms, the hydrocarbon groups K 1 , K 2 being different, X, Y and Z independently of one another represent a hydroxy group of a hydrolysable group and m stands for 0 or 1.

1 . A curable composition encompassing
 two polymers P 1  and P 2 , wherein the polymer P 1  has end groups of the following formula (I)
   -A m -K 1 -SiXYZ  (I),
 
   and the polymer P 2  has end groups of the following formula (II)
   -A m -K 2 -SiXYZ  (II),
 
   wherein   A signifies a divalent binding group,   K 1 , K 2  independently of one another denote a divalent aliphatic hydrocarbon group which has a main chain of 1 to 6 carbon atoms, wherein the hydrocarbon groups K 1 , K 2  are different,   X, Y, Z independently of one another denote a hydroxy group or a hydrolyzable group, and   m assumes the values 0 or 1.   
     
     
         2 . The composition according to  claim 1 , wherein K 2  has a main chain at least one carbon atom longer than K 1 . 
     
     
         3 . The composition according to  claim 1 , wherein K 1  denotes —CH 2 —and/or K 2  denotes —(CH 2 ) 3 —. 
     
     
         4 . The composition according to  claim 1 , wherein X, Y and Z each denote a hydrolyzable group selected from —Cl, —O—C(|O)R 1 , —OR 1 , wherein R 1  denotes a hydrocarbon residue with 1 to 20 C atoms. 
     
     
         5 . The composition according to  claim 1 , wherein X, Y and Z are the same. 
     
     
         6 . The composition according to  claim 1 , wherein the divalent binding group A signifies an amide, carbamate, urea, imino, carboxy, carbonate, thio, mercapto or sulfonate group or an oxygen or nitrogen atom or a urethane group. 
     
     
         7 . The composition according to  claim 1 , wherein the polymers P 1 , P 2  each have a polymer backbone, each of which is selected from alkyd resins, (meth)acrylates and (meth)acrylamides and their salts, phenolic resins, polyalkylenes, polyamides, polycarbonates, polyols, polyethers, polyesters, polyurethanes, vinyl polymers, and copolymers consisting of at least two of the aforementioned classes of polymers. 
     
     
         8 . The composition according to  claim 7 , wherein the molecular weight M n  of the polymer backbone is between 3000 and 50,000 g/mol. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The method according to  claim 9 , wherein the method is carried out at elevated temperature, particularly in a range from 60 to 100° C. 
     
     
         12 . The method according to  claim 9 , wherein the ratio of functional groups D to functional groups C is between 3:1 and 1:1, particularly between 2:1 and 1.3:1. 
     
     
         13 . (canceled) 
     
     
         14 . A preparation containing a composition according to  claim 1 . 
     
     
         15 . The composition according to  claim 1 , wherein X, Y and Z each denote a hydrolyzable group selected from —Cl, —O—C(|O)R 1 , —OR 1 , wherein R 1  denotes a hydrocarbon residue selected from —CH 3  or —C 2 H 5 . 
     
     
         16 . The composition according to  claim 1 , wherein the polymers P 1 , P 2  each have a polymer backbone independently selected from polyethylene oxide or polypropylene oxide. 
     
     
         17 . The composition according to  claim 1 , wherein the divalent binding group A is a urethane group. 
     
     
         18 . The composition according to  claim 1 , wherein the divalent binding group A is the same for P1 and P2 and the divalent binding group is selected from amide, carbamate, urea, imino, carboxy, carbonate, thio, mercapto, sulfonate or urethane group or an oxygen atom or a nitrogen atom.