US 12,421,339 B2
(Meth)acrylic copolymer, pressure-sensitive adhesive composition, pressure-sensitive adhesive, and pressure-sensitive adhesive sheet
Kanami Fujita, Tokyo (JP); Junichi Nakamura, Tokyo (JP); and Hiroko Shinada, Tokyo (JP)
Assigned to Mitsubishi Chemical Corporation, Tokyo (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP)
Filed on Jul. 22, 2021, as Appl. No. 17/383,393.
Application 17/383,393 is a continuation of application No. PCT/JP2020/001660, filed on Jan. 20, 2020.
Claims priority of application No. 2019-016057 (JP), filed on Jan. 31, 2019.
Prior Publication US 2021/0347928 A1, Nov. 11, 2021
Int. Cl. C08F 265/06 (2006.01); C08F 2/38 (2006.01); C08F 2/48 (2006.01); C08F 220/06 (2006.01); C08F 220/14 (2006.01); C08F 220/18 (2006.01); C08F 220/30 (2006.01); C09J 7/38 (2018.01); C09J 151/00 (2006.01)
CPC C08F 265/06 (2013.01) [C08F 2/38 (2013.01); C08F 2/48 (2013.01); C08F 220/06 (2013.01); C08F 220/14 (2013.01); C08F 220/1804 (2020.02); C08F 220/1811 (2020.02); C08F 220/301 (2020.02); C08F 220/306 (2020.02); C09J 7/385 (2018.01); C09J 151/003 (2013.01); C09J 2301/302 (2020.08); C09J 2301/416 (2020.08); C09J 2451/00 (2013.01)] 15 Claims
 
1. A pressure-sensitive adhesive composition comprising a (meth)acrylic copolymer, the (meth)acrylic copolymer comprising a constituent unit a derived from a macromonomer, a constituent unit b derived from a monomer represented by Formula (b), and a constituent unit c:
wherein the macromonomer comprises two or more of a constituent unit X1 represented by formula X1:

OG Complex Work Unit Chemistry
in formula (X1),
R1 represents a hydrogen atom, a methyl group, or CH2OH, and
R2 represents OR3, a halogen atom, COR4, COOR5, CN, CONR6R7, NHCOR8 or R9,
R3 to R8 each independently represent a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alicyclic group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted nonaromatic heterocyclic group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted organosilyl group, or a substituted or unsubstituted polyorganosiloxane, and
R9 represents a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, or a substituted or unsubstituted nonaromatic heterocyclic group,

OG Complex Work Unit Chemistry
in Formula (b),
RA and RB each independently represent an alkyl group, a carboxyl group, or a halogen atom,
n represents 0,
m represents 0, and
X represents a (meth)acryloyloxy group or a (meth)acryloyloxyalkyleneoxy group,
the constituent unit c comprises the constituent unit X1,
an amount of the constituent unit b is 0.01 to 25 wt % with respect to a total amount of the (meth)acrylic copolymer, and
the glass transition temperature of the (meth)acrylic copolymer is −5° C. or lower.