Pressure-sensitive adhesive composition, process for the preparation thereof and pressure-sensitive adhesive sheets
First Claim
1. A process for the preparation of a pressure-sensitive adhesive composition, which comprises subjecting a styrene-based monomer and an acrylic monomer represented by the general formula (1A):
- CH2═
C(R1)COOR2 wherein R1 represents a hydrogen atom or methyl group, and R2 represents a C2-14 alkyl group, to a living radical polymerization in an appropriate order of monomers using a polymerization initiator in the presence of a transition metal and its ligand to produce a block copolymer comprising at least two of a styrene-based polymer block A and an acrylic polymer block B bonded to each other, and then subjecting said block copolymer to crosslinking to produce a crosslinked polymer,wherein said styrene-based monomer and said acrylic monomer are subjected to a living radical polymerization together with at least one monomer selected from the group consisting of a monomer having an epoxy group in its molecule and a monomer having a hydroxyl group in its molecule.
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Accused Products
Abstract
A pressure-sensitive adhesive composition having well-balanced pressure-sensitive adhesive force and cohesive force without causing any safety or economy problems, a process for the preparation of the same and pressure-sensitive adhesive sheets using the same are disclosed. The pressure-sensitive adhesive composition comprises a crosslinked polymer obtained by crosslinking a block copolymer comprising at least two of a styrene-based polymer block A and an acrylic polymer block B having a structural unit represented by the general formula (1):—[CH2═C(R1)COOR2]— wherein R1 represents a hydrogen atom or methyl group, and R2 represents a C2-14 alkyl group, bonded each other, such as A-B or B-A type block copolymer and A-B-A type block copolymer.
105 Citations
18 Claims
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1. A process for the preparation of a pressure-sensitive adhesive composition, which comprises subjecting a styrene-based monomer and an acrylic monomer represented by the general formula (1A):
- CH2═
C(R1)COOR2 wherein R1 represents a hydrogen atom or methyl group, and R2 represents a C2-14 alkyl group, to a living radical polymerization in an appropriate order of monomers using a polymerization initiator in the presence of a transition metal and its ligand to produce a block copolymer comprising at least two of a styrene-based polymer block A and an acrylic polymer block B bonded to each other, and then subjecting said block copolymer to crosslinking to produce a crosslinked polymer,wherein said styrene-based monomer and said acrylic monomer are subjected to a living radical polymerization together with at least one monomer selected from the group consisting of a monomer having an epoxy group in its molecule and a monomer having a hydroxyl group in its molecule. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- CH2═
-
18. A process for the preparation of pressure-sensitive adhesive sheets comprising
preparing a pressure-sensitive adhesive composition by subjecting a styrene-based monomer and an acrylic monomer represented by the general formula (1A): - CH2═
C(R1)COOR2 wherein R1 represents a hydrogen atom or methyl group, and R2 represents a C2-14 alkyl group, to a living radical polymerization in an appropriate order of monomers using a polymerization initiator in the presence of a transition metal and its ligand to produce a block copolymer comprising at least two of a styrene-based polymer block A and an acrylic polymer block B bonded to each other, and then subjecting said block copolymer to crosslinking to produce a crosslinked polymer,wherein said styrene-based monomer and said acrylic monomer are subjected to a living radical polymerization together with at least one monomer selected from the group consisting of a monomer having an epoxy group in its molecule and a monomer having a hydroxyl group in its molecule, and providing a layer of the pressure-sensitive adhesive composition on a support.
- CH2═
Specification