US 11,051,989 B2
Skin-adhesive silicone gel
Caroline Moine, Sorbiers (FR); Maryline Quemin, Villeurbanne (FR); and Gaelle Cros, Ternay (FR)
Assigned to ELKEM SILICONES FRANCE SAS, Lyons (FR)
Appl. No. 16/85,995
Filed by ELKEM SILICONES FRANCE SAS, Lyons (FR)
PCT Filed Mar. 16, 2017, PCT No. PCT/FR2017/000050
§ 371(c)(1), (2) Date Sep. 17, 2018,
PCT Pub. No. WO2017/158249, PCT Pub. Date Sep. 21, 2017.
Claims priority of application No. 1600443 (FR), filed on Mar. 17, 2016.
Prior Publication US 2020/0297544 A1, Sep. 24, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. A61F 13/02 (2006.01); A61L 15/26 (2006.01); A61L 15/58 (2006.01); A61L 26/00 (2006.01); A61L 27/18 (2006.01); C08G 77/20 (2006.01); C08L 75/04 (2006.01); C08L 83/04 (2006.01); C09J 183/04 (2006.01); C08K 5/56 (2006.01)
CPC A61F 13/0213 (2013.01) [A61L 15/26 (2013.01); A61L 15/585 (2013.01); A61L 26/0019 (2013.01); A61L 27/18 (2013.01); C08G 77/20 (2013.01); C08L 75/04 (2013.01); C08L 83/04 (2013.01); C09J 183/04 (2013.01); A61L 2400/14 (2013.01); C08J 2375/04 (2013.01); C08K 5/56 (2013.01); C08L 2203/02 (2013.01); C08L 2205/025 (2013.01); C08L 2205/03 (2013.01)] 24 Claims
 
1. A silicone composition A which is a precursor of a silicone gel G and which is crosslinkable by hydrosilylation, the silicone composition A comprising:
1) at least one organopolysiloxane B comprising:
(I) at least two siloxyl units of formula (B1):
(Y)a(Z)bSiO(4−(a+b)/2  (B1)
in which:
Y represents a monovalent radical containing from 2 to 6 carbon atoms, having at least one alkenyl group,
Z represents a monovalent radical containing from 1 to 20 carbon atoms and not comprising an alkenyl group;
a and b represent integers, a being 1, 2 or 3, b being 0, 1 or 2 and (a+b) being 1, 2 or 3;
(ii) and optionally comprising other siloxyl units of formula (B2):
(Z)cSiO(4−c)/2  (B2)
Z has the same meaning as above, and
c represents an integer which is 0, 1, 2 or 3,
2) at least one organopolysiloxane CE comprising:
two siloxyl end units, which are identical or different, of formula (CE-1):
(H)p(R1)qSiO1/2  (CE-1)
in which:
the symbol R1 corresponds to a C1 to C8 alkyl group or to a C6 to C10 aryl group;
and the symbol H represents a hydrogen atom, with p=0 or 1, q=2 or 3 and (p+q)=3;
at least one siloxyl unit of formula (CE-2):
(H)n(R2)mSiO2/2  (CE-2)
in which the radical R2 corresponds to a C1 to C8 alkyl group or a C6 to C10 aryl group, the symbol H represents a hydrogen atom and with n=0 or 1, m =1 or 2 and (n+m)=2, and
wherein the organopolysiloxane CE contains two hydrogen atoms each one bonded to a different silicon atom per polymer,
3) at least one organopolysiloxane XL comprising:
at least three siloxy units of formula (XL-1):
(H)(L)eSiO(3−e)/2  (XL-1)
in which the symbol H represents a hydrogen atom, the symbol L represents an alkyl having from 1 to 8 carbon atoms inclusive or a C6 to C10 aryl, and the symbol e is equal to 0, 1 or 2; and
optionally other siloxy units of formula (XL-2):
(L)gSiO(4−g)/2  (XL-2)
in which the symbol L represents an alkyl having from 1 to 8 carbon atoms inclusive or a C6 to C10 aryl and the symbol g is equal to 0, 1, 2 or 3, and
wherein the organopolysiloxane XL contains from 2.5% to 15.0% by weight of Si—H function per polymer,
4) an effective amount of at least one hydrosilylation catalyst E,
5) at least one hydrosilylation reaction inhibitor D,
6) optionally at least one additive K, and
the weight amounts of the organopolysiloxanes B, CE and XL are chosen so as to satisfy the following three conditions:
a) a molar ratio RHAlk=tH/tAlk≥3.0,
b) a molar ratio RHCEV=nHCE/tAlk≥2.25; and
c) a mol % RHCE=(nHCE/tH)×100, which is greater than or equal to the value RHCE1, which is determined by the formula: RHCE1=81.36−(3.6×RHAlk), wherein:
tH=number of moles of hydrogen atom directly bonded to a silicon atom of the organopolysiloxanes CE and XL,
tAlk=number of moles of alkenyl directly bonded to a silicon atom of the organopolysiloxane B; and
nHCE=number of moles of hydrogen atom directly bonded to a silicon atom of the organopolysiloxane CE.