Highly elongated single component, non-corrosive RTV silicone compositions

1. A room temperature vulcanizing silicone polymer composition, which includes:

a) as part of the silicone polymer, a segment comprising a silicone polymer of Formula (I):

 wherein

n is about 20 to about 2,400;

R in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical;

R 1 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; and

X is a member selected from the group consisting of O, NR 3 , S(O) m , and P(O) r , wherein

m is 0, 1, or 2,

r is 1 or 2;

R 3 is a member selected from the group consisting of C 1 to C 4 alkyl, C 1 to C 4 alkenyl, and C(O)R 6 ,

wherein R 6 is a member selected from the group consisting of C 1 to C 4 alkyl, C 1 to C 4 alkenyl, and C 1 to C 4 alkoxy; and

b) an inorganic filler present in an amount of at least about 15% by weight of the total composition, wherein:

i. at least about 90% of the inorganic filler has a diameter less than 2 microns;

ii. at least about 65% of the inorganic filler has diameter less than 1 micron; and

iii. the inorganic filler has an average particle diameter from about 0.2 to about 2.0 microns.

2. The composition of claim 1 , further comprising a moisture-cure catalyst.

3. The composition of claim 1 , wherein the polymer is a polymer of Formula (II):

wherein n is about 20 to about 2,400.

4. A method for using the composition of claim 1 to join or seal two substrates comprising the steps of:

a) applying the composition to at least one of the two substrate surfaces;

b) mating the two substrate surfaces in an abutting relationship to form an assembly;

c) exposing the composition to moisture; and

d) maintaining the abutting relationship for a time sufficient to allow the composition to cure.

5. The composition of claim 1 , wherein the composition, when cured, is capable of elongation of greater than 1000%.

6. The composition of claim 1 , wherein the silicone polymer is of formula (III):

wherein n is about 20 to about 2,400;

R in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical;

R 1 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; and

R 2 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical containing at least one heteroatom, wherein

the heteroatom is a member selected from the group consisting of O, N, S, and P; and

the heteroatom is the point of attachment to the methylene group.

7. The composition of claim 6 , wherein R is a member selected from the group consisting of C 1 to C 3 alkyl, vinyl, and phenyl; R 1 is C 1 to C 3 alkyl; and R 2 is a member selected from the group consisting of OR 3 , NR 3 R 4 , S(O) m R 5 , and P(O) r R 5 , wherein

m is 0, 1, or 2;

r is 1 or 2;

R 3 and R 4 are each, independently, members selected from the group consisting of C 1 to C 4 alkyl, C 1 to C 4 alkenyl, and C(O)R 6 ,

wherein R 6 is a member selected from the group consisting of C 1 to C 4 alkyl, C 1 to C 4 alkenyl, and C 1 to C 4 alkoxy; and

R 5 is a member selected from the group consisting of C 1 to C 4 alkyl, C 1 to C 4 alkenyl, C 1 to C 4 alkoxy, and cyano.

8. A room temperature vulcanizing silicone polymer composition, comprising:

a) a silicone polymer that is the reaction product of:

i. a siloxane having the formula:

 wherein

n is about 20 to about 2,400; and

R in each occurrence may he the same or different and is a C 1 to C 10 hydrocarbon radical; and

ii. less than one equivalent of a silane having the formula:

 wherein

R 1 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; and

R 2 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical containing at least one heteroatom, wherein

the heteroatom is a member selected from the group consisting of O, N, S, and P; and

the heteroatom is the point of attachment to the methylene group; and

b) an inorganic filler present in an amount of at least about 15% by weight of the total composition, wherein:

i. at least about 90% of the inorganic filler has a diameter less than 2 microns; and

ii. at least about 65% of the inorganic filler has a diameter less than 1 micron.

9. A method for making a room temperature vulcanizing silicone polymer composition comprising the steps of:

a) reacting:

i. a siloxane having the formula:

 wherein

n is about 20 to about 2,400; and

R in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; with

ii. less than one equivalent of a silane having the formula:

 wherein

R 1 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; and

R 2 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical containing at least one heteroatom, wherein

the heteroatom is a member selected from the group consisting of O, N, S, and P; and

the heteroatom is the point of attachment to the methylene group; and

b) mixing the reaction product of step a) with an inorganic filler present in an amount of at least about 25% by weight of the total composition, wherein:

i. at least about 90% of the inorganic filler has a diameter less than 2 microns; and

ii. at least about 65% of the inorganic filler has a diameter less than 1 micron.

10. A method for increasing the elongation of a room temperature vulcanizing silicone polymer composition, comprising the steps of:

a) reacting:

i. a siloxane having the formula:

 wherein

n is about 20 to about 2,400; and

R in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; with

ii. less than one equivalent of a silane having the formula:

 wherein

R 1 in each occurrence may be the same or different and is a C 1 to C 10 hydrocarbon radical; and

R 2 in each occurrence may the same or different and is a C 1 to C 10 hydrocarbon radical containing at least one heteroatom, wherein

the heteroatom is a member selected from the group consisting of O, N, S, and P; and

the heteroatom is the point of attachment to the methylene group; and

b) mixing the reaction product of step a) an inorganic filler present in an amount of at least about 25% by weight of the total composition, wherein:

i. at least 90% of the inorganic filler has a diameter less than 2 microns; and

ii. at least about 65% of the inorganic filler has a diameter less than 1 micron.