Method for coating a flexible support with a silicone composition

Patent metadata

Field	Value
Publication number	US-10174177-B2
Application number	US-201515304602-A
Country	US
Kind code	B2
Filing date	Apr 14, 2015
Priority date	Apr 18, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

The present invention concerns a method for coating a textile material with a silicone elastomer composition crosslinkable by condensation reactions, to produce a solid silicone elastomer, optionally in a thin layer, on a flexible support that can be made from a textile material, paper, polyvinyl chloride, polyester, polypropylene, polyamide, polyethylene, polyurethane, non-woven glass fiber fabric or polyethylene terephthalate.

First claim

The invention claimed is:

1. A process for coating a liquid silicone composition that is crosslinkable via condensation reaction to form a solid silicone elastomer on a flexible support, comprising a), b) and c) below:
a) a liquid silicone composition that is crosslinkable via condensation reactions is prepared, comprising:
at least one organosilicon compound comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions SiOH,
at least one crosslinking agent,
optionally at least one filler, and
a catalytically effective amount of at least one catalyst which is a magnesium complex comprising in a structure thereof, two identical or different carboxylate ligands, wherein each carboxylate ligand comprises from 10 to 32 carbon atoms,

b) on a flexible support, which may optionally be pre-covered on one or two faces with one or more layers of a polymer material, said silicone composition is deposited continuously or discontinuously onto one face of said flexible support or optionally onto the two faces of said flexible support, and
c) said silicone composition is left to crosslink in the presence of humidity provided by ambient air or by exposure to water vapor, or by prior addition of water to said silicone composition so as to form a crosslinked solid silicone elastomer.

2. The process as claimed in claim 1 , in which, in b), a sufficient amount of said silicone composition is deposited so as to form either a bead or a continuous layer on said flexible support.

3. The process as claimed in claim 1 , in which, in c), said silicone composition is left to crosslink in the presence of humidity provided by ambient air or by exposure to water vapor, or by prior addition of water to said silicone composition at a temperature of between 20 and 90° C.

4. The process as claimed in claim 1 , wherein the catalyst is a complex of formula (1) below:
[Mg(C 1 ) x (C 2 ) y ]   (1)

in which:
the symbols C 1 and C 2 are identical or different ligands chosen from the group of carboxylates comprising from 10 to 32 carbon atoms,
the symbols x and y represent the number of carboxylate ligands and are integers equal to 0, 1 or 2 with the condition that the sum x+y=2.

5. The process as claimed in claim 1 , wherein the catalyst is a complex of formula (2) below:
[Mg(C 1 ) 2 ]   (2)

in which:
the symbol C 1 is a ligand chosen from the group of carboxylates comprising from 10 to 32 carbon atoms.

6. The process as claimed in claim 1 , wherein the carboxylate ligands are selected from the group consisting of:
the anions: decanoate [CH 3 —(CH 2 ) 8 —COO] − , undecanoate [CH 3 —(CH 2 ) 9 —COO] − , dodecanoate or laurate [CH 3 —(CH 2 ) 10 —COO] − , tridecanoate [CH 3 —(CH 2 ) 11 —COO] − , tetradecanoate or myristate [CH 3 —(CH 2 ) 12 —COO] − , pentadecanoate [CH 3 —(CH 2 ) 13 —COO] − , hexadecanoate or palmitate [CH 3 —(CH 2 ) 14 —COO] − , heptadecanoate [CH 3 —(CH 2 ) 15 —COO] − , octadecanoate or stearate [CH 3 —(CH 2 ) 16 —COO] − , nonadecanoate [CH 3 —(CH 2 ) 17 —COO] − , eicosanoate [CH 3 —(CH 2 ) 18 —COO] − , heneicosanoate [CH 3 —(CH 2 ) 19 —COO] − , docosanoate or behenate [CH 3 —(CH 2 ) 20 —COO] − , tricosanoate [CH 3 —(CH 2 ) 21 —COO] − , tetracosanoate or lignocerate [CH 3 —(CH 2 ) 22 —COO] − , pentacosanoate [CH 3 —(CH 2 ) 23 —COO] − , hexacosanoate [CH 3 —(CH 2 ) 24 —COO] − , heptacosanoate acid [CH 3 —(CH 2 ) 25 —COO] − , octacosanoate [CH 3 —(CH 2 ) 26 —COO] − , nonacosanoate [CH 3 —(CH 2 ) 27 —COO] − , triacontanoate [CH 3 —(CH 2 ) 28 —COO] − , hentriacontanoate [CH 3 —(CH 2 ) 29 —COO] − , dotriacontanoate [CH 3 —(CH 2 ) 30 —COO] − , palmitoleate [CH 3 —(CH 2 ) 5 —CH═CH—(CH 2 ) 7 —COO] − , oleate [CH 3 (CH 2 ) 7 CH═CH(CH 2 ) 7 COO] − , linoleate [CH 3 —(CH 2 ) 4 —(CH═CHCH 2 ) 2 —(CH 2 ) 6 —COO] − , linolenate [CH 3 —CH 2 —(CH═CHCH 2 ) 3 —(CH 2 ) 6 —COO] − and arachidonate [CH 3 —(CH 2 ) 4 —(CH═CHCH 2 ) 4 —(CH 2 ) 2 —COO] − ,
the anions: 7,7-dimethyloctanoate [(CH 3 ) 3 C—(CH 2 ) 5 —COO] − , 2,2-dimethyloctanoate [CH 3 —(CH 2 ) 5 —C(CH 3 ) 2 —COO] − , 2,2,3,5-tetramethylhexanoate [(CH 3 ) 2 CH—CH 2 —CH(CH 3 )—C(CH 3 ) 2 —COO] − , 2,5-dimethyl-2-ethylhexanoate [(CH 3 ) 2 CH—(CH 2 ) 2 —C(CH 3 )(C 2 H 5 )—COO] − , 2,2-diethylhexanoate [CH 3 —(CH 2 ) 3 —C(C 2 H 5 ) 2 —COO] − , 2,4-dimethyl-2-isopropylpentanoate [(CH 3 ) 2 CH—CH 2 —C(CH 3 )(i-propyl)-COO] − , and
C 10 to C 20 naphthenate anions.

7. The process as claimed in claim 1 , wherein the carboxylate ligands are selected from the group consisting of carboxylates of empirical formula [C 10 H 19 O 2 ] − and C 10 to C 20 naphthenates.

8. The process as claimed in claim 1 , wherein the catalyst is a [Mg(neodecanoate) 2 ] complex or a [Mg(naphthenate) 2 ] complex with the naphthenate anion having a C 10 to C 20 .

9. The process as claimed in claim 1 , in which the organosilicon compound is a polyorganosiloxane comprising:
(i) at least two siloxyl units of formula (3) below:

R
a
1

⁢

Z
b

⁢

SiO

(

4
-

(

a
+
b

)

2

)

(
3
)

in which:
the symbols which may be identical or different, represent C 1 to C 30 monovalent hydrocarbon-based radicals,
the symbols Z, which may be identical or different, each represent a hydrolyzable and condensable group or a hydroxyl group and are selected from the group consisting of hydroxyl, alkoxy, alkoxy-alkylene-oxy, amino, amido, acylamino, aminoxy, iminoxy, ketimonoxy, acyloxy, iminoxi, ketiminoxy and enoxy,
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 optionally

(ii) one or more siloxyl units of formula (4) below:

R
c

⁢

SiO

(

4
-
c

2

)

(
4
)

in which:
the symbols R, which may be ide

Assignees

• Bluestar Silicones France
• Elkem Silicones France Sas

Inventors

• Feder Michel
• Maliverney Christian

Classifications

• B05D2256/00

  Wires or fibres · CPC title

• C09D183/04 Primary

  Polysiloxanes · CPC title

• C08G77/16

  to hydroxy groups · CPC title

• C08G77/04

  Polysiloxanes · CPC title

• D06N3/128

  with silicon polymers · CPC title