US 12,459,280 B1
Method for improving glossiness and ink color fastness of printed color films and its application thereof
Baoshan Yue, Kunming (CN); Zhihua Liu, Kunming (CN); Zhenhua Yu, Kunming (CN); Jiao Xie, Kunming (CN); Geng Li, Kunming (CN); Ying Zhang, Kunming (CN); Hao Wang, Kunming (CN); Han Zheng, Kunming (CN); Yongfa Gui, Kunming (CN); Tingting Yu, Kunming (CN); Jing Zhang, Kunming (CN); and Jiang Yu, Kunming (CN)
Assigned to CHINA TOBACCO YUNNAN INDUSTRIAL CO., LTD., Kunming (CN)
Filed by CHINA TOBACCO YUNNAN INDUSTRIAL CO., LTD., Kunming (CN)
Filed on Jun. 17, 2025, as Appl. No. 19/239,965.
Application 19/239,965 is a continuation in part of application No. PCT/CN2024/125291, filed on Oct. 16, 2024.
Claims priority of application No. 202411110872.3 (CN), filed on Aug. 14, 2024.
Int. Cl. B41M 5/00 (2006.01); B41M 7/00 (2006.01); B65B 61/02 (2006.01); C08J 7/04 (2020.01); C08J 7/043 (2020.01); C08L 23/14 (2006.01); C09D 11/54 (2014.01)
CPC B41M 5/0017 (2013.01) [B41M 5/0064 (2013.01); B41M 7/009 (2013.01); B65B 61/025 (2013.01); C08J 7/042 (2013.01); C08J 7/043 (2020.01); C08L 23/142 (2013.01); C09D 11/54 (2013.01); C08J 2323/14 (2013.01); C08J 2483/04 (2013.01); C08J 2495/00 (2013.01); C08L 2203/16 (2013.01); C08L 2205/03 (2013.01)] 6 Claims
 
1. A method for improving glossiness and ink color fastness of a printed color film, wherein the printed color film is a composite biaxially oriented polypropylene (BOPP) film, and the method comprises the following steps:
pre-treating outer and inner surfaces of the composite BOPP film, wherein the composite BOPP film comprises (i) a surface layer comprising a blended film of a first polypropylene (PP) copolymer, silica, a phenyl-modified silicone and hydrogenated petroleum resin, (ii) a core layer comprising a blended film of a PP homopolymer, an antistatic agent and the hydrogenated petroleum resin, and (iii) an inner layer comprising a blended film of a second PP copolymer, the phenyl-modified silicone and the hydrogenated petroleum resin;
coating the outer and inner surfaces of the composite BOPP film with a surface-modifying coating agent and drying it at a temperature of 80-100° C., wherein the surface-modifying coating agent includes a waterborne silane coupling agent, an ethyl orthosilicate, a solid acid and water in a mass ratio of (5-10):(50-100):(5-10):(300-400), the waterborne silane coupling agent is one of methyl trichlorosilane (MTS) or an amino silane, and the solid acid is ethylenediaminetetraacetic acid; and
printing the outer surface of the composite BOPP film with a water-based colored ink, and drying to obtain the printed color film.