Coating composition, adhesive or non-adhesive coating layer containing said coating composition, and laminate including these coating layers
Coating compositions including 0.5 to 30.0% by mass of acrylic polymers (A) and 70.0 to 99.5% by mass of polymerizable compounds (B) are provided. The acrylic polymers (A) contain a branched alkyl group having 3 to 20 carbon atoms and/or a branched or unbranched alkenyl group having 3 to 20 carbon atoms in the side chain. The coating compositions can form non-adhesive coating layers with good adhesion to various resinous base materials excellent surface hardness, tack resistance, bending resistance, scratch resistance, shrinkage resistance and moisture heat resistance. The coating compositions also can form adhesive coating layers with excellent close adhesion, adhesiveness, transparency, contamination resistance, heat and moisture resistance, yellowing resistance, and step followability. Moreover, various laminates, cover films, cover substrates and the like having these coating layers on one side or both sides of the resin films and/or resinous base materials are provided.
1 . A coating composition comprising 0.5 to 30.0% by mass of an acrylic polymer (A) and 70.0 to 99.5% by mass of a polymerizable compound (B), wherein
the acrylic polymer (A) has 50% by mol or more of structural units derived from one or more (meth)acrylate monomers having branched alkyl groups having 3 to 20 carbon atoms and/or branched or unbranched alkenyl groups having 3 to 20 carbon atoms, and the polymerizable compound (B) comprises a monofunctional acrylic monomer (b1) and a urethane oligomer (b3);
wherein the monofunctional acrylic monomer b1 contains:
a monofunctional acrylic monomer having a homopolymer glass transition temperature (Tg) of 10° C. or less, and
a monofunctional acrylic monomer having a homopolymer glass transition temperature (Tg) exceeds 60° C.; and
wherein the content of (b3) is 2.0 to 50.0% by mass based on the total coating composition.
2 . The coating composition according to claim 1 , wherein the acrylic polymer (A) has a weight-average molecular weight of 100,000 to 6,000,000 and a glass transition temperature (Tg) of −85° C. to 40° C.
3 . The coating composition according to claim 1 , wherein the acrylic polymer (A) has
a side chain (A1), or
a side chain (A2), and/or
a side chain (A3),
the side chain (A1) having an active hydrogen-containing functional group (R1),
the side chain (A2) having a functional group (R2) which can react with the functional group (R1) in the side chain (A1), and
the side chain (A3) having a (meth)acryloyl or unsaturated cycloaliphatic hydrocarbon group.
4 . The coating composition according to claim 1 , wherein
the polymerizable compound (B) contains the monofunctional acrylic monomer (b1) and further comprises a polyfunctional acrylic monomer (b2), and
the content of (b1) is 10.0 to 96.0% by mass based on the total coating composition, and the content of (b2) is up to 80.0% by mass based on the total coating composition.
5 . The coating composition according to claim 1 , wherein the urethane oligomer (b3) is a urethane (meth)acrylamide oligomer.
6 . A coating layer obtained by polymerizing the coating composition according to claim 1 with light and/or heat, wherein
the coating layer is a non-adhesive coating layer or an adhesive coating layer.
7 . An adhesive sheet comprising a film and/or sheet base material and the coating layer according to claim 6 provided on one side or both sides of the base material.
8 . A laminate comprising a film and/or sheet base material and the coating layer according to claim 7 provided on one side or both sides of the base material.
9 . An optical laminate comprising a film and/or sheet base material and a coating layer provided on one side or both sides of the base material, wherein
the coating layer is obtained by polymerizing the coating composition according to claim 1 with light and/or heat, and
the optical laminate has a total light transmittance of 80% or more.
10 . A laminate for flexible devices, comprising a film and/or sheet base material and a coating layer provided on one side or both sides of the base material, wherein
the coating layer is obtained by polymerizing the coating composition according to claim 1 with light and/or heat.
11 . A laminate for surface protection comprising a film and/or sheet base material and a coating layer provided on one side or both sides of the base material, wherein
the coating layer is obtained by polymerizing the coating composition according to claim 1 with light and/or heat.
12 . The laminate according to claim 8 , wherein
the film material is a film of any one kind selected from polyester film, polycarbonate film, fluorine-containing resin film, polyimide film, triacetylcellulose film, acrylic film, polystyrene film, polyvinyl chloride film, polyvinyl alcohol film, and nylon film.
13 . The adhesive sheet according to claim 7 , wherein
the film base material is a film of any one kind selected from polyester film, polycarbonate film, fluorine-containing resin film, polyimide film, triacetylcellulose film, acrylic film, polystyrene film, polyvinyl chloride film, polyvinyl alcohol film, and nylon film.