Cross-linkable silicone composition for the production of non-stick coatings for flexible supports and attachment promoting additive contained in this composition

摘要

Silicone composites subject to reticulation or reticulated, particularly for creating a coating or water-repellent and anti-adhesive film for flexible substrates such as paper or similar in the form of natural or synthetic polymer films. These compounds contain reticulating polyorganosiloxanes that have SiH units and unsaturated polyorganosiloxanes, preferably vinylated, suitable for reacting with the reticulating agent in an addition reaction and in the presence of platinum to form the reticulated anti-adhesive coating on the flexible substrate, plus at least one additive (D) to promote adhesion to it. A new liquid silicone compound can be applied without using a solvent, which is beneficial, that can be reticulated instantly to produce an anti-adhesive and/or water-repellent coating for the flexible substrate, giving very high quality reticulated silicone coatings, particularly in terms of sticking/adhering to the substrate, being harder to rub off and the anti-adhesion profile (sufficiently increase detaching force at high speed.

主权项

1. Silicone composition capable of cross-linking/curing by polyaddition, for forming a coating which is water-repellent and non-stick on a support, and comprising:
(A) an alkenylated silicone component containing at least one functional silicone oil comprising at least one PolyOrganoSiloxane (POS) comprising units of formula (I.1)Wa⁢Zb⁢SiO4-(a+b)2(I⁢.1) in which: W represents independently a functional alkenyl group, Z represents independently a monovalent hydrocarbon group, with no unfavourable effect on the activity of the catalyst and selected from the group consisting of the methyl, ethyl, propyl and 3,3,3-trifluoropropyl groups, a is 1 or 2, b is 0, 1 or 2 and a+b is between 1 and 3; (B) at least one cross-linking silicone oil comprising at least one hydrogenated POS having, per molecule, at least three hydrogen atoms bound to the silicon; (C) at least one catalyst comprising at least one metal belonging to the platinum group; (D) at least one attachment promoting additive containing at least one epoxidated silicone oil comprising at least one PolyOrganoSiloxane (POS) comprising:
units of formula (I.2):Yc⁢Zd1⁢SiO4-(c+d)2(I⁢.2) optionally units of formula (I.3):Ze2⁢SiO4-e2(I⁢.3) optionally units of formula (I.4):Yg′⁢Zh3⁢SiO4-(g+h)2(I⁢.4) optionally units of formula (I.5):Hi⁢Zj4⁢SiO4-(i+j)2(I⁢.5) formulae in which: Y represents independently a linear, branched or cyclic epoxy-functional hydrocarbon group; Y′ represents independently an alkoxy-functional group; Z1, Z2, Z3, Z4 are groups which correspond to the same definition as that given above for the Z groups in the legend to formula (I.1); c is 1 or 2, d is 0, 1 or 2 and c+d is between 1 and 3; e is between 0 and 3; g is 1 or 2, h is 0, 1 or 2 and g+h is between 1 and 3; i is 1 or 2, j is 0, 1 or 2 and i+j is between 1 and 3; this attachment promoting additive (D) comprising, per molecule, a Si—H unit level at essentially zero, so as to obtain a pot life in a non-gelified liquid state of at least one year, wherein the attachment promoting additive (D) can be preserved for a period of at least one year in a non-gelified liquid state and suitable for use in a composition to be applied to a support in order to form a non-stick coating; (E) optionally at least one cross-linking inhibitor; (F) optionally, an adhesion modulating system; (G) optionally, at least one diluent; (H) optionally, at least one other functional additive, in particular a “processing aid” operating auxiliary of the “anti-misting” additive type, wherein the attachment promoting additive (D) is selected from the group of silicones consisting of: 1. the POSs containing: (I.2) units with c=1 and c+d=2: Depoxy optionally (I.2) units with c=1 and c+d=3: Mepoxy optionally (I.3) units with e=2: D optionally (I.4) units with e=1 and g+h=2: Dalkoxy optionally (I.4) units with e=1 and g+h=3: Malkoxy optionally (I.5) units with i=1 and i+j=2: D′ optionally (I.5) units with i=1 and i+j=3: M′ of formula
M[D]do[Dalkoxy]da[Depoxy]de[D′]d′[Mepoxy]me[M′]m′M with 0≦do<500; 0≦da≦50, 1≦de≦40; 0≦d′<1; 0≦m′<1; d′+m′ being less than 1; 0≦me≦2; 2. the POSs of average formula:
M[D]do[Depoxy]de[Mepoxy]meM with do, de, me as defined above, 3. and mixtures thereof, the attachment promoting additive (D) comprising at least one photoinitiator composition.