C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
117/183, 117/27,
C09J 7/02 (2006.01) B05D 3/06 (2006.01) B05D 5/08 (2006.01) C08G 65/00 (2006.01) C09D 171/02 (2006.01)
Patent
CA 2030221
43704 CAN 2A ABSTRACT OF THE DISCLOSURE This invention relates to release liners, and more particularly, to release liners suitable for use with highly aggressive pressure-sensitive adhesives. Certain pressure-sensitive adhesives, particularly those derived from silicone resins, are so aggressive that tapes employing them exhibit undesirably high peel forces upon removal from known low-adhesion coatings, especially after prolonged storage or when used in a high-temperature environment. The adhesive of such tapes may carry away, and consequently, be contaminated by appreciable amounts of the low-adhesion material. If this occurs, the tapes will exhibit poor readhesion when applied to "end-use" receptor surfaces. This invention provides curable, crosslinkable compositions and coatings prepared therefrom that can be used to form low-surface energy liners that can be used with aggressive pressure-sensitive adhesives, such as adhesives formed from silicone resins. The release characteristics of these coatings do not diminish upon aging and do not adversely affect the readhesion properties of adhesives that have come in contact with the coatings. The invention further provides substrates bearing a layer of the composition of the invention. These coated substrates are particularly suitable for release liners, especially differential release liners and low-adhesion backsizes for pressure-sensitive adhesive tapes and sheet materials, especially for pressure-sensitive adhesives derived from silicone resins. Because the coatings of this invention can have more than 50% by weight inert oils without significantly reducing the readhesion of adhesives removed from them, they provide an economic advantage over those coatings prepared by using only the more expensive reactive group-containing polyfluoropolyethers.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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