Silicone composition that can be cured in the presence of water or atmospheric moisture

Patent metadata

Field	Value
Publication number	US-9828470-B2
Application number	US-201415039646-A
Country	US
Kind code	B2
Filing date	Dec 3, 2014
Priority date	Dec 3, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The invention concerns compositions that can be cured in the presence of water or atmospheric moisture comprising at least one polyorganosiloxane having one or a plurality of condensable group(s) or hydrolysable and condensable group(s) and at least one compound capable of catalyzing the condensation reaction of the condensable or hydrolysable and condensable groups of the polyorganosiloxane. This compound is a heterometallic complex of which the chemical formula comprises at least two different metal atoms M and M′, M being an atom chosen from the group consisting of the atoms of columns 2 and 13 of the periodic table and M′ being an atom chose from the group consisting of the atoms of column 4 of the periodic table, and at least one alkoxide or chelating ligand.

First claim

The invention claimed is:

1. A composition that can be cured in the presence of water or atmospheric moisture comprising:
(A) at least one polyorganosiloxane A having one or more condensable or hydrolyzable and condensable group(s), and
(B) at least one compound C, capable of catalyzing the condensation reaction of the condensable or hydrolyzable and condensable groups of the polyorganosiloxane A, and which is a heterometallic complex whose chemical formula comprises:
at least two different metal atoms M and M′, M being an atom selected from the group consisting of the atoms in columns 2 and 13 of the periodic table and M′ being an atom selected from the group consisting of the atoms in column 4 of the periodic table, and
at least one alkoxide ligand or chelating ligand,

in which the at least one polyorganosiloxane A comprises:
(i) at least two siloxyl units of the following formula (V):

R
a
4

⁢

Z
b

⁢

⁢

SiO

4
-

(

a
+
b

)

2

(
V
)

in which:
the symbols R 4 , which may be identical or different, represent monovalent C 1 to C 30 hydrocarbon radicals,
the symbols Z, which may be identical or different, each represent a hydrolyzable and condensable group or a hydroxyl group,
a is equal to 0, 1 or 2, b is equal to 1, 2 or 3, the sum a+b is equal to 1, 2 or 3, and

(ii) optionally one or more siloxyl unit(s) of the following formula (VI):

R
c
5

⁢

⁢

SiO

4
-
c

2

(
VI
)

in which:
the symbols R 5 , which may be identical or different, represent monovalent C 1 -C 30 hydrocarbon radicals optionally substituted with one or more halogen atoms or with amino, ether, ester, epoxy, mercapto or cyano groups, and
the symbol c is equal to 0, 1, 2 or 3.

2. The composition as claimed in claim 1 , wherein compound C is a heterometallic complex whose chemical formula comprises:
at least two different metal atoms M and M′, M being an atom of magnesium (Mg) or of aluminum (Al), and M′ being an atom of titanium (Ti) or of zirconium (Zr), and at least one alkoxide ligand or chelating ligand.

3. The composition as claimed in claim 2 , wherein compound C is selected from the group consisting of:
a heterometallic complex whose chemical formula comprises:
at least two different metal atoms M and M′, M being aluminum and M′ being zirconium and in which the molar ratio Al/Zr=0.5, 1 or 2; and
at least one alkoxide ligand or chelating ligand; and

a heterometallic complex whose chemical formula comprises:
at least two different metal atoms M and M′, M being aluminum and M′ being titanium and in which the molar ratio Al/Ti=1 or 2, and
at least one alkoxide ligand or chelating ligand.

4. The composition as claimed in claim 1 wherein compound C is a heterometallic alkoxide complex whose chemical formula comprises:
at least two different metal atoms M and M′, M being magnesium or aluminum and M′ being titanium or zirconium, and
at least one alkoxide ligand.

5. The composition as claimed in claim 4 , wherein said heterometallic alkoxide complex is selected from the group consisting of:
a heterometallic alkoxide complex whose chemical formula comprises at least two different metal atoms M and M′, M being aluminum and M′ being zirconium, at least one alkoxide ligand of chemical formula O-(linear or branched C 3 -C 12 alkyl), and in which the molar ratio Al/Zr has the value 0.5, 1 or 2;
a heterometallic alkoxide complex whose chemical formula comprises at least two different metal atoms M and M′, M being magnesium and M′ being zirconium, at least one alkoxide ligand of chemical formula O-(linear or branched C 2 -C 12 alkyl), and in which the molar ratio Mg/Zr has the value 0.5, 1, 2, 3 or 4; and
a heterometallic alkoxide complex whose chemical formula comprises at least two different metal atoms M and M′, M being aluminum and M′ being titanium, at least one alkoxide ligand of chemical formula O-(linear or branched C 3 -C 12 alkyl), and in which the molar ratio Al/Ti has a value of 1 or 2.

6. The composition as claimed in claim 1 wherein compound C is a heterometallic chelated complex whose chemical formula comprises:
at least two different metal atoms M and M′, M being magnesium or aluminum and M′ being titanium or zirconium, and
at least one chelate ligand.

7. The composition as claimed in claim 1 further comprising a crosslinking agent B.

8. The composition as claimed in claim 7 , in which the crosslinking agent B is a silicon compound having the following formula (XIII):
R 20 (4-j) SiY j   (XIII)

in which:
the symbol R 20 is a monovalent hydrocarbon radical comprising from 1 to 30 carbon atoms,
the symbols Y, which may be identical or different, are selected from the group consisting of the alkoxy, alkoxy-alkylene-oxy, amino, amido, acylamino, aminoxy, iminoxy, ketiminoxy, acyloxy or enoxy groups,
the symbol j=2, 3 or 4.

9. The composition as claimed in claim 1 , additionally comprising an adhesion promoter E.

10. A single-component composition RTV-1 that is in a single airtight package P and comprises:
a) at least one polyorganosiloxane A,
b) at least one crosslinking agent B,
c) a catalytically effective amount of at least one compound C, and
d) optionally at least one filler D,
wherein A and C are as defined in claim 1 .

11. A silicone elastomer obtained by bringing the contents of package P of the single component composition RTV-1 as claimed in claim 10 into contact with atmospheric moisture and leaving said contents to cure.

12. A two-component composition RTV-2, precursor of the composition as claimed in claim 1 which is in two separate packages P 1 and P 2 wherein:
a) package P 1 is airtight and compris

Assignees

• Bluestar Silicones France
• Univ Claude Bernard Lyon
• Centre Nat Rech Scient

Inventors

• Monteil Vincent
• Spitz Roger
• Mondiere Aurelie
• Ireland Tania
• Seggio Anne

Classifications

• B01J31/2226

  Anionic ligands, i.e. the overall ligand carries at least one formal negative charge · CPC title

• C09D183/04 Primary

  Polysiloxanes · CPC title

• B01J2531/46

  Titanium · CPC title

• B01J2531/48

  Zirconium · CPC title

• C08G77/16

  to hydroxy groups · CPC title