Compositions on the basis of organyloxysilane-terminated polymers

Abstract

Moisture-curing adhesives simultaneously having high tensile strength and elongation are prepared by admixing a silane-terminated polyurethane or polyether polymer having a defined and limited molecular weight, finely divided silica, and an organosilicon compound containing basic nitrogen.

1 .- 11 . (canceled) 
     
     
         12 . A composition, comprising:
 (A) at least one silane-crosslinking polymer of the formula
   Y—[(CR 1   2 ) b —SiR a (OR 2 ) 3-a]x   (I),
 
   
       where
 Y comprises a polyurethane or polyoxyalkylene polymer residue which is x-valent and attached to (CR 1   2 ) via nitrogen, oxygen, sulfur or carbon, 
 R each independently is a monovalent, optionally substituted hydrocarbyl radical, 
 R 1  each independently is hydrogen or a monovalent, optionally substituted hydrocarbyl radical optionally attached to the carbon atom of the CR 1   2  group via nitrogen, phosphorus, oxygen, sulfur or a carbonyl group, 
 R 2  each individually is hydrogen or a monovalent, optionally substituted hydrocarbyl radical, 
 x is an integer from 1 to 10, 
 a each individually is 0, 1 or 2, and 
 b each individually is an integer from 1 to 10, 
 (B) finely divided silica, and 
 (D) at least one basic nitrogen organosilicon compound comprising units of the Formula
   D c Si(OR 3 ) d R 4   e O (4-c-d-e)/2   (V),
 
 
 
       where
 R 3  each individually is hydrogen or an optionally substituted hydrocarbyl radical, 
 D each individually is a monovalent SiC-bonded radical with basic nitrogen, 
 R 4  each individually is a monovalent, optionally substituted SiC-bonded organic radical free from basic nitrogen, 
 c is 0, 1, 2, 3 or 4, 
 d is 0, 1, 2 or 3, and 
 e is 0, 1, 2 or 3, 
 
       with the proviso that the sum total of c+d+e is not more than 4 and at least one D radical is present per molecule, and with the further proviso that silane-crosslinking polymer(s) (A) have an average molar mass M n  (number average) of at least 8000 g/mol and at most 30,000 g/mol and that the composition comprises finely divided silica in an amount of 16 to 50 wt %, based on the overall weight of the composition. 
     
     
         13 . The composition of  claim 12 , wherein c is 1. 
     
     
         14 . The composition of  claim 12 , wherein d is 1, 2, or 3. 
     
     
         15 . The composition of  claim 12 , wherein e is 1 or 0. 
     
     
         16 . The composition of  claim 12 , wherein e is 1 or 0. 
     
     
         17 . The composition of  claim 12 , wherein c is 1, d is 2 or 3, and e is 1 or 0. 
     
     
         18 . The composition of  claim 12 , wherein component (B) comprises pyrogenic silica having a BET surface area between 35 and 400 m 2 /g. 
     
     
         19 . The composition of  claim 12 , comprising finely divided silica (B) in a concentration of at least 19 wt % and at most 40 wt %, based on the overall weight of composition. 
     
     
         20 . The composition of  claim 12 , further comprising at least one nonreactive plasticizer. 
     
     
         21 . The composition of  claim 20 , wherein the plasticizer is present in a concentration of at least 5 wt % and at most 50 wt %, based on the overall weight of composition. 
     
     
         22 . The composition of  claim 12 , comprising:
 (A) at least one compound of formula (I),   (B) finely divided silica,   (C) at least one nonreactive plasticizer,   (D) at least one basic nitrogen compound comprising units of formula (V),   (E) optionally filler(s),   (F) optionally catalyst(s),   (H) optionally adhesion promoter(s),   (I) optionally water scavenger(s),   (J) optionally additive(s), and   (K) optionally admixture agent(s).   
     
     
         23 . A method of forming a composition of  claim 12 , comprising mixing the individual components in any desired order. 
     
     
         24 . A shaped article obtained by crosslinking a composition of  claim 12 . 
     
     
         25 . A method of adhesively bonding substrates, comprising applying a composition of  claim 12  onto the surface of at least one substrate, and then contacting this surface with a second substrate, and subsequently allowing the composition to crosslink. 
     
     
         26 . A method of forming composites, which comprises applying a composition of  claim 12  onto at least one substrate and then allowing the composition to crosslink.