Silicone resin compositions which can be cured at room temperature

Patent metadata

Field	Value
Publication number	US-9790327-B2
Application number	US-201414913426-A
Country	US
Kind code	B2
Filing date	Aug 12, 2014
Priority date	Aug 23, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The present invention relates to compositions comprising a binder which comprises at least one alkoxy-functional polysiloxane, and at least one crosslinking catalyst, the crosslinking catalyst representing a silicon-containing guanidine compound, and also, optionally, an alkoxysilane as crosslinker.

First claim

The invention claimed is:

1. A composition, comprising:
(a) a binder comprising at least one alkoxy-functional polysiloxane; and
(b) at least one crosslinking catalyst which is a silicon-containing guanidine moiety of formula (IVa), (IVb) or (IVc):

wherein:
R 3 are divalent radicals which, independently of one another, are identical or different linear or branched hydrocarbon radicals containing 1 to 50 carbon atoms, and which may be interrupted by at least one heteroatom, and/or may be substituted by at least one hydroxyl radical, at least one amino radical, or a mixture thereof;
R 11 , R 12 , R 21 , R 22 and R 31 independently of one another, are identical or different and are hydrogen, linear or branched or cyclic hydrocarbons containing 1 to 15 carbon atoms, it being possible for the hydrocarbons also to contain 1 or 2 heteroatoms;
a silicon compound is bonded to R 3 via a Si atom,
wherein component b) further comprises at least one crosslinking catalyst of the formula (I):
M a M G b D c D G d T e Q f   (I),

wherein:
a=0 to 10,
b=0 to 10,
c=0 to 350,
d=0 to 50,
e=0 to 50,
f=0 to 10,
where the sum of the indices b and d is greater than or equal to 1 to 20,
with the proviso that when the index a is 2 and at the same time the sum of the indices b, c, e and f is zero, the index d is other than 1,
M=[R 3 SiO 1/2 ]
M G =[R G R 2 SiO 1/2 ],
D=[R 2 SiO 2/2 ],
D G =[R G 2 SiO 2/2 ],
T=[RSiO 3/2 ],
Q=[SiO 4/2 ],
R are, independently of one another, identical or different and are OR a groups and/or linear or branched, saturated or else mono- or polyunsaturated hydrocarbon radicals, which may be interrupted by heteroatoms and/or may be substituted one or more times by hydroxyl, amino, carboxyl or aryl radicals,
R a is identical or different and is hydrogen and/or alkyl groups having 1 to 12 carbon atoms,
R G is a radical containing guanidine groups and of the formula (IVa), (IVb) or (IVc), the tautomers and/or salts thereof,

R 3 are divalent radicals which, independently of one another, are identical or different, linear or branched hydrocarbon radicals containing 1 to 50 carbon atoms, and may be interrupted by heteroatoms, and
R 11 , R 12 , R 21 , R 22 and R 31 are, independently of one another, identical or different and are hydrogen, linear or branched or cyclic hydrocarbons containing 1 to 15 carbon atoms, it being possible for the hydrocarbons also to contain 1 or 2 heteroatoms,
wherein the alkoxy-functional polysiloxane of component (a) satisfies the general formula (II):
R a Si(OR′) b O (4-a-b)/2   (II),

wherein:
a and b independently of one another are greater than 0 to less than 2,
R are, independently of one another, identical or different, linear or branched, saturated or else mono- or polyunsaturated or aromatic hydrocarbon radicals, and
R′ is an alkyl group consisting of 1 to 8 carbon atoms.

2. The composition of claim 1 , further comprising:
(c) an alkoxysilane as a crosslinker component.

3. The composition according to claim 2 , wherein the alkoxysilane (c) is a silane of the formula (III):
R a Si(OR′) b   (III),

wherein:
a and b independently of one another are greater than 0 to less than 2, and the sum of a+b is 4,
R is an alkyl group or cycloalkyl group consisting of 1 to 8 carbon atoms, or an aromatic moiety having 6 to 20 carbon atoms, and
R′ is an alkyl group consisting of 1 to 8 carbon atoms.

4. The composition of claim 1 , further comprising at least one additive.

5. A coating material, comprising the composition of claim 1 .

6. A method, comprising curing the composition of claim 1 at room temperature and without addition of a metal-containing catalyst.

7. The method of claim 6 , wherein the curing occurs in the presence of moisture.

Assignees

• Klotzbach Thomas
• Fiedel Michael
• Ferenz Michael
• Fiedel Olga
• Jussofie M-Ibrahim
• Hinzmann Dirk
• Hojak Wolfgang
• Eissmann Ingrid
• Evonik Degussa Gmbh

Inventors

• Klotzbach Thomas
• Fiedel Michael
• Ferenz Michael
• Fiedel Olga
• Jussofie M-Ibrahim
• Hinzmann Dirk
• Hojak Wolfgang
• Eissmann Ingrid

Classifications

• C08K5/5465 Primary

  containing at least one C=N bond · CPC title

• C08L83/06

  containing silicon bound to oxygen-containing groups (C08L83/12 takes precedence) · CPC title

• C08G77/18

  to alkoxy or aryloxy groups · CPC title

• C08G77/08 Primary

  characterised by the catalysts used · CPC title

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title