Release coating formulation providing low adhesion release surfaces for pressure sensitive adhesives
Assignee3M Innovative Properties Company
InventorsRamesh C. Kumar, Elda T. G. Bloemendal, Bruce C. Schmidt
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Abstract
Release coating formulations and release coatings derived therefrom that incorporate a blend of a silicone vinyl copolymer and a second polymer for which the release qualities are extremely stable over time. The silicone vinyl copolymer and the second polymer include complementary crosslinkable functionality allowing interpolymer crosslinks to be formed.
Claims51
A release coating comprising the crosslinked product of:
- a copolymer comprising at least one silicone block and at least one vinyl copolymeric block;
- and
- a second polymer that is different from said copolymer, and selected from the group consisting of acrylic polymers, polyurethanes, polyesters, polyamides, polyimides, vinyl copolymers, polycarbonates, polyolefins, and combinations thereof;
- wherein one of said copolymer and said second polymer comprises an acidic moiety and the other comprises a basic moiety, and wherein said at least one vinyl copolymeric block of said copolymer comprises, per 100 parts by weight of the copolymer, 35 to 50 parts by weight of a nonionic free radically polymerizable monomer, 20 to 45 parts by weight of a free radically polymerizable monomer having a basic moiety, and 2 to 5 parts by weight of a free radically polymerizable monomer having an acidic moiety.
A coatable composition comprising:
- a copolymer comprising at least one silicone block and at least one vinyl copolymeric block;
- and
- a second polymer that is different from said copolymer, and selected from the group consisting of acrylic polymers, polyurethanes, polyesters, polyamides, polyimides, vinyl copolymers, polycarbonates, polyolefins, and combinations thereof;
- wherein one of said copolymer and said second polymer comprises an acidic moiety and the other comprises a basic moiety and wherein said at least one vinyl copolymeric block comprises, per 100 parts by weight of the copolymer, 35 to 50 parts by weight of a nonionic free radically polymerizable monomer, 20 to 45 parts by weight of a free radically polymerizable monomer having a basic moiety, and 2 to 5 parts by weight of a free radically polymerizable monomer having an acidic moiety.
An adhesive tape having first and second major surfaces, wherein the tape comprises a pressure sensitive adhesive layer proximal to the first major surface and a release coating proximal to the second major surface, wherein a composition comprising:
- a copolymer comprising at least one silicone block and at least one vinyl copolymeric block;
- and
- a second polymer that is different from said copolymer, and selected from the group consisting of acrylic polymers, polyurethanes, polyesters, polyamides, polyimides, vinyl copolymers, polycarbonates, polyolefins, and combinations thereof;
- wherein one of said copolymer and said second polymer comprises an acidic moiety and the other comprises a basic moiety, is coated on said second major surface and crosslinked to form said release coating.
A method of forming a release coating on a substrate, comprising:
- a providing a coatable composition comprising:
- a copolymer comprising at least one silicone block and at least one vinyl copolymeric block;
- and
- a second polymer that is different from said copolymer, and selected from the group consisting of acrylic polymers, polyurethanes, polyesters, polyamides, polyimides, vinyl copolymers, polycarbonates, polyolefins, and combinations thereof;
- wherein one of said copolymer and said second polymer comprises an acidic moiety and the other comprises a basic moiety, and wherein said at least one vinyl copolymeric block of said copolymer comprises, per 100 parts by weight of the copolymer, 35 to 50 parts by weight of a nonionic free radically polymerizable monomer, 20 to 45 parts by weight of a free radically polymerizable monomer having a basic moiety, and 2 to 5 parts by weight of a free radically polymerizable monomer having an acidic moiety;
- b. coating said coatable composition on said substrate;
- and
- c. crosslinking said coatable composition to form said release coating.
Dependencies are inferred from the claim text.