Moisture Cross-Linking Composition Containing Alkoxysilyl Functional Particles
Compositions which are crosslinkable contain an alkoxysilyl or hydroxyl-functional binder and functionalized particles prepared by reacting a filler having reactive groups on its surface with an alkoxysilane in which an alkoxysilyl group is linked to a heteroatom by an optionally substituted methylene spacer. The particle may react with the alkoxy group of the alkoxysilane or with a group containing the heteroatom of the alkoxysilane to functionalize the particles.
1 - 11 . (canceled)
12 . A moisture-crosslinking composition comprising at least one alkoxysilyl-functional binder, OH-functional binder, or mixture thereof, and moisture-crosslinkable particles prepared by reacting:
particles of a material comprising metal oxides, metal-silicon mixed oxides, silicon dioxide, colloidal silicon dioxide, organopolysiloxane resins or combinations thereof, possessing at least one functionality M-OH, Si—OH, M-O-M, M-O—Si—, Si—O—Si, M-OR 2 , Si—OR 2 , or a group H which is reactive toward a group A,
with organosilane(s) of the formula I,
(R 2 O) 3−v R 1 v Si—CR 3 2 -A (I)
where
M is a metal atom,
A is —OR 4 , —P(O)(OR 4 ) 2 , —N(R 4 ) 2 , —NH—CO—N(R 4 ), —N(R 4 )—CO—NH(R 4 ),—N(R 4 ) 2 , —NH—CO—OR 4 , or
R 1 is an alkyl, cycloalkyl, aryl or arylalkyl radical, 1 to 12 C atoms, the carbon chain of the alkyl, cycloalkyl, aryl, or arylalkyl radical optionally interrupted by one or more nonadjacent oxygen, sulfur or NR 3 groups,
R 2 is hydrogen or an alkyl, cycloalkyl or aryl radical having 1 to 6 C atoms, the carbon chain of the alkyl, cycloalkyl, or aryl radical optionally interrupted by nonadjacent oxygen, sulfur or NR 3 groups,
R 3 is hydrogen or an alkyl, cycloalkyl, arylalkyl, aryl, aminoalkyl or aspartic ester radical,
R 4 is hydrogen or an alkyl, cycloalkyl, arylalkyl, aryl, aminoalkyl, aspartic ester, —CO—CH═CH 2 or —CO—C(CH 3 )═CH 2 radical,
R 5 is a difunctional, unsubstituted or substituted alkyl or arylalkyl radical which in the alkyl chain optionally possesses oxygen atoms, carbonyl groups, NH— functions or an NR 4 function, and
v is 0, 1 or 2.
13 . The composition of claim 12 , wherein R 2 is methyl or ethyl.
14 . The composition of claim 12 , wherein at least one group H is selected from the group consisting of carboxyl, carbonyl, ester, thiol, amino, carbinol, epoxy, acrylic and methacrylic groups.
15 . The composition of claim 13 , wherein at least one group H is selected from the group consisting of carboxyl, carbonyl, ester, thiol, amino, carbinol, epoxy, acrylic and methacrylic groups.
16 . The composition of claim 12 , wherein the particles possess an average diameter of less than 1000 nm as determined by transmission electron microscopy.
17 . The composition of claim 12 , wherein the particles comprise of pyrogenic or colloidal silica.
18 . The composition of claim 12 , wherein the amount of the particles contained in the composition is at least 5% by weight, based on the total weight of the composition.
19 . The composition of claim 12 , wherein the composition contains alkoxy-functional binders, at least a portion of the alkoxy-functional binders comprising compounds whose alkoxysilyl functions are separated by a methylene group from a heteroatom.
20 . The composition of claim 13 , wherein the composition contains alkoxy-functional binders, at least a portion of the alkoxy-functional binders comprising compounds whose alkoxysilyl functions are separated by a methylene group from a heteroatom.
21 . The composition of claim 14 , wherein the composition contains alkoxy-functional binders, at least a portion of the alkoxy-functional binders comprising compounds whose alkoxysilyl functions are separated by a methylene group from a heteroatom.
22 . The composition of claim 12 , wherein the alkoxysilyl-functional binder comprises monomeric, oligomeric, or polymeric compounds.
23 . The composition of claim 12 , wherein OH-functional binders are present, and comprises Si—OH-functional siloxanes.
24 . A process for preparing a composition of claim 12 , comprising, functionalizing the particles with alkoxysilanes (I) to give functionalized particles, in the presence or absence of binder, and if binder is not present during functionalizing, subsequently admixing the functionalized particles with the binder.
25 . The process of claim 24 , wherein the particles are functionalized with the alkoxysilanes in the presence of the binder.
26 . The process of claim 24 which is a two step preparation, functionalizing taking place in the first step, and admixing with binder taking place in a second step.