MOISTURE-CROSSLINKABLE MASTIC COMPOSITION FOR HIGH-TEMPERATURE JOINT EXPOSURE

1 - 12 . (canceled)

13 . A sealant composition comprising:

from 3% to 80% of a polymer (A) comprising an alkoxysilane group,

at least 25% of a carbonate filler (B), and

from 0.5% to 20% of a polysiloxane resin (C) comprising, as groups directly linked to the silicon atom:

at least one phenyl group; and

at least one group chosen from the group consisting of a hydroxyl and an aminoalkylene group of formula: —R′ 0 —NH—R″ 0 , wherein:

R′ 0 is an alkylene radical comprising from 2 to 5 carbon atoms; and

R″ 0 is a hydrogen atom or an alkyl radical comprising from 1 to 5 carbon atoms; and

from 0.1% to 1% of a crosslinking catalyst (D);

said percentages being expressed by weight on the basis of the total weight of said composition.

14 . The sealant composition as claimed in claim 13 , wherein the polymer (A) comprising an alkoxysilane group comprises at least one group of formula (I):

[Chem 13]

—Si(R 4 ) p (OR 5 ) 3-p   (I)

wherein:

R 4 and R 5 , which may be identical or different, each represent a linear or branched alkyl radical comprising from 1 to 4 carbon atoms; and

p is an integer equal to 0, 1 or 2.

15 . The sealant composition as claimed in claim 14 , wherein the polymer (A) comprising an alkoxysilane group is selected from the group consisting of the polymers of formulae (II), (III) and (IV):

wherein:

R 0 represents a linear or branched divalent alkylene radical comprising from 3 to 6 carbon atoms;

R 1 represents a divalent hydrocarbon-based radical comprising from 5 to 15 carbon atoms which can be aromatic or aliphatic and linear, branched or cyclic;

R 2 represents a linear or branched divalent alkylene radical comprising from 2 to 4 carbon atoms;

R 3 represents a linear or branched divalent alkylene radical comprising from 1 to 6 carbon atoms;

R 6 represents a hydrogen atom, a phenyl radical, a linear, branched or cyclic alkyl radical comprising from 1 to 6 carbon atoms, or a 2-succinate radical of formula:

wherein R 7 is a linear or branched alkyl radical comprising from 1 to 6 carbon atoms;

n is an integer such that the number-average molecular weight of the polyether block of formula —[OR 2 ] n — ranges from 300 g/mol to 40 000 g/mol in the polymers of formulae (II), (Ill) and (IV);

m 1 is zero or an integer;

n and m 1 are such that the number-average molecular weight of the polymer of formula (III) ranges from 500 g/mol to 50 000 g/mol;

m is an integer other than zero; and

n and m are such that the number-average molecular weight of the polymer of formula (IV) ranges from 500 g/mol to 50 000 g/mol.

16 . The sealant composition as claimed in claim 13 , wherein the carbonate filler is selected from the group consisting of alkali metal and alkaline-earth metal carbonates and mixtures thereof.

17 . The sealant composition as claimed in claim 13 , wherein the polysiloxane resin (C) comprises an aminoalkylene group of formula:

R′ 0 —NH—R″ 0 ; wherein R′ 0 is an alkylene radical comprising from 2 to 3 carbon atoms and R″ 0 is a hydrogen atom.

18 . The sealant composition as claimed in claim 13 , wherein the polysiloxane resin (C) is a silsesquioxane.

19 . The sealant composition as claimed in claim 18 , wherein the silsesquioxane (C) corresponds to general formula (V):

wherein each one from among R′ 1 to R′ 8 represents, independently of one another, a group chosen from:

a hydrogen atom,

a hydroxyl group or the aminoalkylene group of formula: —R′ 0 —NH—R″ 0 ;

a radical chosen from the group consisting of a linear or branched C 1 -C 4 alkoxy radical, a linear or branched alkyl radical comprising from 1 to 30 carbon atoms, an alkenyl radical comprising from 2 to 30 carbon atoms, an aromatic radical comprising from 6 to 30 carbon atoms, an allyl radical comprising from 3 to 30 carbon atoms, a cyclic aliphatic radical comprising from 3 to 30 carbon atoms and an acyl radical comprising from 1 to 30 carbon atoms, and

an —OSiR′ 9 R′ 10 group wherein R′ 9 and R′ 10 each represent, independently of one other, a hydrogen atom or a radical chosen from the group consisting of a linear or branched C 1 -C 4 alkyl, a linear or branched C 1 -C 4 alkoxy, a C 2 -C 4 alkenyl, a phenyl, a C 3 -C 6 allyl radical, a cyclic C 3 -C 8 aliphatic radical and a C 1 -C 4 acyl radical;

on condition that:

at least one radical among the R′ 1 to R′ 8 radicals is a phenyl radical; and

at least one radical among the R′ 1 to R′ 8 radicals is either a hydroxyl group or the aminoalkylene group of formula: —R′ 0 —NH—R″ 0 —.

20 . The sealant composition as claimed in claim 13 , wherein the polysiloxane resin (C) has a number-average molecular weight ranging from 400 g/mol to 4000 g/mol.

21 . The sealant composition as claimed in claim 13 , further comprising, in addition to the ingredients (A), (B), (C) and (D), from 0.5% to 30% by weight of at least one additive selected from the group consisting of plasticizers, solvents, pigments, adhesion promoters, moisture absorbers, UV stabilizers, rheological agents, and also fillers other than the carbonate fillers.

22 . The sealant composition as claimed in claim 13 , wherein the sealant comprises from:

10% to 50% by weight of polymer (A) comprising an alkoxysilane group;

25% to 80% by weight of carbonate filler (B);

0.5% to 5% by weight of polysiloxane resin (C);

0.2% to 0.8% by weight of crosslinking catalyst (D); and

0.5% to 30% of an additive chosen from plasticizers, solvents, pigments, adhesion promoters, moisture absorbers, UV stabilizers, rheological agents and fillers other than the carbonate fillers.

23 . The sealant composition as claimed in claim 13 , wherein the sealant comprises from:

20% to 30% by weight of polymer (A) comprising an alkoxysilane group;

40% to 60% by weight of carbonate filler (B);

0.5% to 1.5% by weight of polysiloxane resin (C);

0.2% to 0.8% by weight of crosslinking catalyst (D); and

10% to 30% of an additive chosen from plasticizers, solvents, pigments, adhesion promoters, moisture absorbers, UV stabilizers, rheological agents and fillers other than the carbonate fillers.

24 . An adhesive, sealant or coating comprising the composition as defined in claim 13 .