Method for coating a textile medium
The present invention relates to a method of coating a textile with a silicon elastomer composition that can be crosslinked by polyaddition, enabling the textile to be given a non-slip property. The invention also relates to textile articles thus coated, such as clothing and lace, exhibiting good adhesion to various mediums, such as skin, another textile, a fibrous medium, etc.
1. A process for coating a silicone composition (A), which is a precursor of an elastomer and is polyaddition-crosslinkable, onto a textile medium, said process comprising the following steps a), b) and c):
a) preparing a silicone composition (A) which is a precursor of an elastomer and is polyaddition-crosslinkable, comprising:
at least one linear or branched polyorganosiloxane (B) carrying alkenyl groups and comprising:
1) terminal siloxyl units of type M=(X) s (R) t SiO 1/2 in which the radicals R, which are identical or different, correspond to a C 1 -C 6 linear or branched alkyl group, optionally substituted, or a substituted or unsubstituted aryl group, and the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, with s=0 or 1, t=2 or 3 and s+t=3; and
2) siloxyl units, which are identical or different, of type D=(X) u (R 1 ) v SiO 2/2 in which the radicals R 1 meet the same definition as for R, the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, with u=0 or 1, v=1 or 2 and u+v=2,
with the condition that the polyorganosiloxane (B) comprises at least two radicals X per molecule;
at least one linear or branched polyorganosiloxane (C) carrying one alkenyl group per molecule and comprising:
1) terminal siloxyl units, which are identical or different, of type M=(X) w (R 2 ) x SiO 1/2 in which the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, and the radicals R 2 meet the same definition as for R, with w=0 or 1, x=2 or 3 and w+x=3; and
2) siloxyl units D=(X) y (R 3 ) z SiO 2/2 in which the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, and the radicals R 3 meet the same definition as for R, with y=0 or 1, z=1 or 2 and y+z=2,
with the condition whereby the polyorganosiloxane (C) comprises just one radical X per molecule;
at least two hydrogenopolyorganosiloxanes (D), one (D-1) having a chain extender role and the other (D-2) having a crosslinking role:
said chain extender hydrogenopolyorganosiloxane (D-1) comprising:
1) terminal siloxyl units of type M=(R 4 ) 2 (H)SiO 1/2 in which the radicals R 4 meet the same definition as for R and
2) siloxyl units, which are identical or different, of type D=(R 5 ) 2 SiO 2/2 in which the radicals R 5 meet the same definition as for R,
with the condition that the chain extender hydrogenopolyorganosiloxane (D-1) comprises two SiH functional groups per molecule;
said crosslinking hydrogenopolyorganosiloxane (D-2) comprising:
1) terminal siloxyl units of type M=(R 6 ) 2 (H)SiO 1/2 in which the radicals R 6 meet the same definition as for R and
2) siloxyl units, which are identical or different, of type D=(R 7 ) p (H) q SiO 2/2 in which the radicals R 7 meet the same definition as for R, with p=1 or 2, q=0 or 1 and p+q=2,
with the condition whereby that the crosslinking hydrogenopolyorganosiloxane (D-2) comprises at least three SiH functional groups per molecule;
at least one mineral filler (E);
catalytically effective amount of at least one hydrosilylation catalyst (F);
at least one crosslinking inhibitor (G);
optionally at least one unreactive polyorganosiloxane (H) comprising:
1) terminal siloxyl units of type M=(R 8 ) 3 SiO 1/2 in which the radicals R 8 meet the same definition as for R and
2) siloxyl units, which are identical or different, of type D=(R 9 ) 2 SiO 2/2 in which the radicals R 9 meet the same definition as for R, and
optionally a formulation additive (I),
with the additional condition that the amounts of the polyorganosiloxanes (B), (C) and (D) are chosen so that the molar ratio r2 of the hydrogen atoms linked to the silicone of the crosslinking hydrogenopolyorganosiloxanes (D-2) for the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is defined as follows:
0.10≦r 2 ≦0.40,
b) next, said silicone composition (A) is deposited continuously or discontinuously on said textile medium; and
c) crosslinking said silicone composition (A) by heating and/or by infrared radiation.
2. The process as claimed in claim 1 , wherein the polyorganosiloxanes (B), (C) and (D) are added to the silicone composition (A) so that the molar ratio r of the hydrogen atoms linked to the silicon of the hydrogenopolyorganosiloxanes (D-1) and (D-2) to the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is greater than 1.
3. The process as claimed in claim 1 , wherein the silicone composition (A) has a dynamic viscosity of greater than 100 000 mPa·s.
4. The process as claimed in claim 1 , wherein the silicone composition (A) is obtained by mixing at least two parts P1 and P2 comprising the constituents (B) to (G) and optionally (H) and (I), with the condition that a catalyst (F) for the hydrosilylation reaction is separate from the constituent (D).
5. The process as claimed in claim 1 , wherein the silicone composition (A) comprises the constituents (B) to (I) in the following proportions, expressed as percentage by weight relative to the total weight of the silicone composition (A):
(B) from 40 to 90
(C) from 4 to 20
(D-1) from 1 to 2
(D-2) from 0.1 to 0.6
(E) from 5 to 20
(F) from 0.005 to 0.25
(G) from 0.010 to 0.020
(H) from 0 to 10
(I) from 0 to 5.
6. The process as claimed in claim 1 , wherein in step b) said silicone composition (A) is deposited on the textile medium by a transfer roll coater, by a lick roll coater or by spraying using a nozzle, a doctor blade, a rotary frame or by a reverse roll coater.
7. The process as claimed in claim 1 , wherein the textile medium is a lace or an elastic strip.
8. A silicone composition (A) which is a precursor of an elastomer and is polyaddition-crosslinkable, comprising:
at least one linear or branched polyorganosiloxane (B) carrying alkenyl groups and comprising:
1) terminal siloxyl units of type M=(X) s (R) t SiO 1/2 in which the radicals R, which are identical or different, correspond to a C 1 -C 6 linear or branched alkyl group, optionally substituted, or a substituted or unsubstituted aryl group, and the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, with s=0 or 1, t=2 or 3 and s+t=3; and
2) siloxyl units, which are identical or different, of type D=(X) u (R 1 ) v SiO 2/2 in which the radicals R 1 meet the same definition as for R, the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, with u=0 or 1, v=1 or 2 and u+v=2,
with the condition whereby the polyorganosiloxane (B) comprises at least two radicals X per molecule;
at least one linear or branched polyorganosiloxane (C) carrying one alkenyl group per molecule and comprising:
1) terminal siloxyl units, which are identical or different, of type M=(X) w (R 2 ) x SiO 1/2 in which the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, and the radicals R 2 meet the same definition as for R, with w=0 or 1, x=2 or 3 and w+x=3; and
2) siloxyl units D=(X) y (R 3 ) z SiO 2/2 in which the radicals X correspond to alkenyl groups having 2 to 6 carbon atoms, and the radicals R 3 meet the same definition as for R, with y=0 or 1, z=1 or 2 and y+z=2,
with the condition whereby the polyorganosiloxane (C) comprises just one radical X per molecule;
at least two hydrogenopolyorganosiloxanes (D), one (D-1) having a chain extender role and the other (D-2) having a crosslinking role:
said chain extender hydrogenopolyorganosiloxane (D-1) comprising:
1) terminal siloxyl units of type M=(R 4 ) 2 (H)SiO 1/2 in which the radicals R 4 meet the same definition as for R and
2) siloxyl units, which are identical or different, of type D=(R 5 ) 2 SiO 2/2 in which the radicals R 5 meet the same definition as for R,
with the condition that the chain extender hydrogenopolyorganosiloxane (D-1) comprises two SiH functional groups per molecule;
said crosslinking hydrogenopolyorganosiloxane (D-2) comprising:
1) terminal siloxyl units of type M=(R 6 ) 2 (H)SiO 1/2 in which the radicals R 6 meet the same definition as for R and
2) siloxyl units, which are identical or different, of type D=(R 7 ) p (H) q SiO 2/2 in which the radicals R 7 meet the same definition as for R, with p=1 or 2, q=0 or 1 and p+q=2,
with the condition that the crosslinking hydrogenopolyorganosiloxane (D-2) comprises at least three SiH functional groups per molecule;
at least one mineral filler (E);
catalytically effective amount of at least one hydrosilylation catalyst (F);
at least one crosslinking inhibitor (G);
optionally at least one unreactive polyorganosiloxane (H) comprising:
1) terminal siloxyl units of type M=(R 8 ) 3 SiO 1/2 in which the radicals R 8 meet the same definition as for R and
2) siloxyl units, which are identical or different, of type D=(R 9 ) 2 SiO 2/2 in which the radicals R 9 meet the same definition as for R, and
optionally a formulation additive (I),
with the additional condition that the amounts of the polyorganosiloxanes (B), (C) and (D) are chosen so that the molar ratio r 2 of the hydrogen atoms linked to the silicon of the crosslinking hydrogenopolyorganosiloxanes (D-2) to the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is defined as follows:
0.10≦r 2 ≦0.40.
9. The silicone composition (A) as claimed in claim 8 , wherein the polyorganosiloxanes (B), (C) and (D) have been added to the silicone composition (A) so that the molar ratio r of the hydrogen atoms linked to the silicon of the hydrogenopolyorganosiloxanes (D-1) and (D-2) to the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is greater than 1.
10. A coated textile that can be obtained by the process as claimed in claim 1 .
11. A silicone composition (A) as defined in claim 8 for coating a textile medium.
12. The process as claimed in claim 1 with the additional condition that the amounts of the polyorganosiloxanes (B), (C) and (D) are chosen so that the molar ratio r2 of the hydrogen atoms linked to the silicone of the crosslinking hydrogenopolyorganosiloxanes (D-2) for the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is defined as follows:
0.15≦r 2 ≦0.35.
13. The process as claimed in claim 1 with the additional condition that the amounts of the polyorganosiloxanes (B), (C) and (D) are chosen so that the molar ratio r2 of the hydrogen atoms linked to the silicone of the crosslinking hydrogenopolyorganosiloxanes (D-2) for the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is defined as follows:
0.20≦r 2 ≦0.30.
14. The process as claimed in claim 1 , wherein the polyorganosiloxanes (B), (C) and (D) are added to the silicone composition (A) so that the molar ratio r of the hydrogen atoms linked to the silicon of the hydrogenopolyorganosiloxanes (D-1) and (D-2) to the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is between 1 and 1.35.
15. The silicone composition as claimed in claim 8 with the additional condition that the amounts of the polyorganosiloxanes (B), (C) and (D) are chosen so that the molar ratio r2 of the hydrogen atoms linked to the silicone of the crosslinking hydrogenopolyorganosiloxanes (D-2) for the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is defined as follows:
0.15≦r 2 ≦0.35.
16. The silicone composition as claimed in claim 8 with the additional condition that the amounts of the polyorganosiloxanes (B), (C) and (D) are chosen so that the molar ratio r2 of the hydrogen atoms linked to the silicone of the crosslinking hydrogenopolyorganosiloxanes (D-2) for the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is defined as follows:
0.20≦r 2 ≦0.30.
17. The silicone composition (A) as claimed in claim 8 , wherein the polyorganosiloxanes (B), (C) and (D) have been added to the silicone composition (A) so that the molar ratio r of the hydrogen atoms linked to the silicon of the hydrogenopolyorganosiloxanes (D-1) and (D-2) to the alkenyl radicals linked to the silicon of the polyorganosiloxanes (B) and (C) is between 1 and 1.35.
18. A silicone composition (A) as defined in claim 8 for coating a textile medium comprising a lace or an elastic strip.