Cross-linkable masses based on organyl-oxysilane-terminated polymers

Abstract

Moisture curable compositions having a low modulus and a high resilience are prepared by curing a composition containing a first polymer which predominately contains two moisture-curable silyl groups, and a second polymer which is terminated by an alkoxy group and contains but a single moisture-curable silyl group, or a hydroxyl group.

What is claimed is: 
     
         1 . A moisture-curable composition comprising:
 (A) 100 parts by weight of at least one silane-crosslinking polymer of the formula
   (HO) x —Y—[O—CO—NH—(CR 1   2 ) b —SiR a (OR 2 ) 3-a ] 2-x   (I)
 
   
       where 
       Y is a divalent polymer radical, 
       R each, independently, is the same or different and is a monovalent, optionally substituted hydrocarbyl radical, 
       R 1  each, independently, is the same or different and is a hydrogen atom or a monovalent, optionally substituted hydrocarbyl radical, 
       R 2  each, independently, is may be the same or different and is a hydrogen atom or a monovalent, optionally substituted hydrocarbyl radical, 
       x is 0 or 1, 
       a each, independently, is the same or different and is 0, 1 or 2 
       and 
       b each, independently, is the same or different and is an integer from 1 to 10, 
       with the proviso that component (A) includes less than 15 mol % of polymers of the formula (I) with x=1, 
       and
 (B) 5 to 500 parts by weight of at least one silane-crosslinking polymer of the formula
   R 6 —O—Z—[O—CO—NH—(CR 4   2 ) d —SiR 3   c (OR 5 ) 3-c ] 1-y [OH] y   (II)
 
 
 where 
 
       Z is a divalent polymer radical having no hydroxyl group, 
       R 3  each, independently, is the same or different and is a monovalent, optionally substituted hydrocarbyl radical, 
       R 4  each, independently, is the same or different and is a hydrogen atom or a monovalent, optionally substituted hydrocarbyl radical, 
       R 5  each, independently, is the same or different and is a hydrogen atom or a monovalent, optionally substituted hydrocarbyl radical, 
       R 6  each, independently, is monovalent, optionally substituted hydrocarbyl radical, 
       y is 0 or 1, 
       c each, independently, is the same or different and is 0, 1 or 2 
       and 
       d may be the same or different and is an integer from 1 to 10,
 (C) 0.1 to 10 parts by weight of organosilicon compounds containing nitrogen atoms not bonded to a carbonyl group; 
 (D) 50 to 500 parts by weight of filler(s), and 
 (I) 0.01 to 100 parts by weight of unreactive plasticizers, 
 
       with the provisos that component (A) contains less than 10 mol % of polymers of the formula (I) with x=1, and that component (B) includes less than 10 mol % of polymers of the formula (II) with y=1. 
     
     
         2 . The composition of  claim 1 , wherein component (A) includes less than 5 mol % of polymers of the formula (I) with x=1. 
     
     
         3 . The composition of  claim 1 , wherein component (B) includes less than 5 mol % of polymers of the formula (II) with y=1. 
     
     
         4 . The composition of any of  claim 1 , wherein the composition contains 10 to 100 parts by weight of polymer (B). 
     
     
         5 . The composition of  claim 1 , wherein the organosilicon compounds (C) are compounds containing units of the formula
   D e Si(OR 7 ) f R 8   g O (4-e-f-g)/2   (III)
   where   R 7  each, independently, is the same or different and is a hydrogen atom or optionally substituted hydrocarbyl radicals,   D each, independently, are the same or different and are monovalent, SiC-bonded radicals containing nitrogen atoms which are not bonded directly to a carbonyl group,   R 8  each, independently, are the same or different and are monovalent, optionally substituted, SiC-bonded, nitrogen-free organic radical,   e is 0, 1, 2, 3 or 4,   f is 0, 1, 2 or 3 and   g is 0, 1, 2 or 3,   with the proviso that the sum total of e+f+g is less than or equal to 4 and at least one D radical is present per molecule.   
     
     
         6 . The composition of  claim 1 , comprising:
 (A) 100 parts by weight of polymer(s) (A),   (B) 5 to 500 parts of polymer(s) (B),   (C) 0.1 to 10 parts by weight of organosilicon compounds not having nitrogen atoms bonded directly to carbonyl groups,   (D) 50 to 500 parts by weight of fillers,   (E) optionally, silicone resins,   (F) optionally, catalysts,   (G) optionally, adhesion promoters,   (H) optionally, water scavengers,   (I) 0.01 to 100 parts by weight of unreactive plasticizers,   (J) optionally, further additives and   (K) optionally, further admixtures,   
       wherein at least one of (E), (F), (G), (H), (J), and/or (K) is present. 
     
     
         7 . A process for producing a composition of  claim 1 , comprising mixing the individual components in any sequence. 
     
     
         8 . A shaped body produced by crosslinking a composition of  claim 1 . 
     
     
         9 . A shaped body produced by crosslinking a composition, produced by the process of  claim 8 . 
     
     
         10 . A method for bonding substrates, comprising applying a composition of  claim 1  to a surface of at least one substrate, and then contacting this surface with a second substrate to be bonded, and allowing the composition to crosslink. 
     
     
         11 . A method for bonding substrates, comprising applying a composition prepared by the process of  claim 7 . 
     
     
         12 . A method of producing composite material, comprising applying the composition of  claim 1  to at least one substrate and allowing the composition to crosslink. 
     
     
         13 . A method of producing composite material, comprising applying the composition prepared by the process of  claim 7  to a substrate. 
     
     
         14 . The moisture-curable composition of  claim 5 , wherein radical D contains an amino group. 
     
     
         15 . The moisture-curable composition of  claim 1 , wherein both component (A) and component (B) contain less than 5 mol percent of polymers where x=1 and y=1. 
     
     
         16 . The composition of  claim 14 , wherein the composition is free of metal catalysts. 
     
     
         17 . The composition of  claim 1 , wherein component (B) is present in an amount of 25 to 75 parts by weight relative to 100 parts by weight of component (A). 
     
     
         18 . The composition of  claim 1 , having a resilience of at least 70%, and a 100% modulus of from 0.1 to 0.5 MPa. 
     
     
         19 . The composition of  claim 1 , having a resilience greater than 60%, and a 100% modulus of from 0.1 to 0.5 MPa. 
     
     
         20 . The composition of  claim 1 , wherein at least 70 mol percent of component (A) polymers, b=3, R 1 =H, and a=0, and in the remaining polymers of component (A), b=1, R 1 =H, and wherein at least 70 mol percent of component (B) polymers, d=1, R 4 =H, and c=1.