US 8,541,501 B2
Water-dispersed pressure-sensitive adhesive composition, pressure-sensitive adhesive and pressure-sensitive adhesive sheet
Mika Okada, Ibaraki (Japan); and Chie Kitano, Ibaraki (Japan)
Assigned to Nitto Denko Corporation, Osaka (Japan)
Appl. No. 13/643,455
Filed by Mika Okada, Ibaraki (Japan); and Chie Kitano, Ibaraki (Japan)
PCT Filed Apr. 24, 2012, PCT No. PCT/JP2012/060943
§ 371(c)(1), (2), (4) Date Oct. 25, 2012,
PCT Pub. No. WO2012/160929, PCT Pub. Date Nov. 29, 2012.
Claims priority of application No. 2011-117951 (JP), filed on May 26, 2011; application No. 2011-160387 (JP), filed on Jul. 22, 2011; and application No. 2012-033057 (JP), filed on Feb. 17, 2012.
Prior Publication US 2013/0137813 A1, May 30, 2013
Int. Cl. C08L 25/10 (2006.01); C08L 33/08 (2006.01); C08L 9/08 (2006.01); C08L 33/10 (2006.01); C08L 33/12 (2006.01); C08L 9/02 (2006.01); C08L 9/04 (2006.01); C08L 9/06 (2006.01); C08L 9/00 (2006.01); C08K 5/00 (2006.01); C08F 20/40 (2006.01); C08F 36/06 (2006.01); C08F 20/44 (2006.01); C08F 12/08 (2006.01)
U.S. Cl. 524—855  [524/81; 524/523; 524/539; 524/856; 526/327; 526/335; 526/341; 526/346] 20 Claims
 
1. A water-dispersed pressure-sensitive adhesive composition comprising a (meth)acrylic polymer, a latex containing a rubber component, and a tackifier, wherein:
the (meth)acrylic polymer is obtained by polymerizing a monomer composition comprising as a primary component an alkyl (meth)acrylate having an alkyl group with 1 to 18 carbon atoms;
the rubber component is immiscible with the (meth)acrylic polymer and has a loss tangent peak temperature of −5° C. or below when determined by a dynamic viscoelastic measurement in which shear strain is applied at a frequency of 1 Hz.; and
the tackifier is miscible with the rubber component, but immiscible with the (meth)acrylic polymer.