US 12,257,811 B2
Laser-printable film and packaging in which same is used
Shintaro Ishimaru, Fukui (JP); and Masayuki Haruta, Fukui (JP)
Assigned to TOYOBO CO., LTD., Osaka (JP)
Appl. No. 17/786,799
Filed by TOYOBO CO., LTD., Osaka (JP)
PCT Filed Dec. 14, 2020, PCT No. PCT/JP2020/046564
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/125135, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 2019-229924 (JP), filed on Dec. 20, 2019.
Prior Publication US 2023/0038115 A1, Feb. 9, 2023
Int. Cl. B32B 27/32 (2006.01); B32B 7/023 (2019.01); B32B 7/028 (2019.01); B32B 27/20 (2006.01); B32B 38/00 (2006.01); B41M 5/26 (2006.01); B65D 65/40 (2006.01)
CPC B32B 27/32 (2013.01) [B32B 7/023 (2019.01); B32B 7/028 (2019.01); B32B 27/20 (2013.01); B32B 38/145 (2013.01); B41M 5/267 (2013.01); B65D 65/40 (2013.01); B32B 2264/10 (2013.01); B32B 2309/105 (2013.01); B32B 2310/0843 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A polyolefin-based film comprising at least one layer permitting printing as a result of laser irradiation, wherein the layer permitting printing as a result of laser irradiation is a stretched film layer, wherein the film has not less than 100 ppm but not greater than 3000 ppm of pigment permitting printing as a result of laser irradiation, wherein the film has a haze of not less than 1% but not greater than 30%, wherein the film has an unevenness in thickness in either a machine direction or a transverse direction of not less than 0.1% but not greater than 25%, and wherein the film has a thermal shrinkage in either the machine direction or the transverse direction following exposure for 30 minutes to 140° C. hot air of not less than −0.5% but not greater than 10%.