ACRYLIC BLOCK COPOLYMER-BASED ASSEMBLY LAYER FOR FLEXIBLE DISPLAYS

    公开(公告)号:US20190062608A1

    公开(公告)日:2019-02-28

    申请号:US15574218

    申请日:2016-06-01

    Abstract: The present invention is an assembly layer for a flexible device. The assembly layer is derived from precursors including an acrylic block copolymer including (a) at least two A block polymeric units that are the reaction product of a first monomer composition comprising an alkyl methacrylate, an aralkyl methacrylate, an aryl methacrylate, or a combination thereof, wherein each A block has a Tg of at least about 50° C., and wherein the acrylic block copolymer comprises about 5 to about 50 weight percent A block, and (b) at least one B block polymeric unit that is the reaction product of a second monomer composition comprising an alkyl (meth)acrylate, a heteroalkyl (meth)acrylate, a vinyl ester, or a combination thereof, wherein the B block has a Tg no greater than about 10° C., and wherein the acrylic block copolymer comprises about 50 to about 95 weight percent B block. Within a temperature range of between about −30° C. to about 90° C., the assembly layer has a shear storage modulus at a frequency of 1 rad/sec that does not exceed about 2 MPa, a shear creep compliance (J) of at least about 6×10−6 1/Pa measured at 5 seconds with an applied shear stress between about 50 kPa and about 500 kPa, and a strain recovery of at least about 50% at at least one point of applied shear stress within the range of about 5 kPa to about 500 kPa within about 1 minute after removing the applied shear stress.

Patent Agency Ranking