US 11,987,676 B2
Black polyester film and method for manufacturing the same
Te-Chao Liao, Taipei (TW); Wen-Cheng Yang, Taipei (TW); Chun-Cheng Yang, Taipei (TW); Chia-Yen Hsiao, Taipei (TW); and Ching-Yao Yuan, Taipei (TW)
Assigned to NAN YA PLASTICS CORPORATION, Taipei (TW)
Filed by NAN YA PLASTICS CORPORATION, Taipei (TW)
Filed on Mar. 10, 2021, as Appl. No. 17/197,402.
Claims priority of application No. 109114092 (TW), filed on Apr. 28, 2020.
Prior Publication US 2021/0332200 A1, Oct. 28, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 5/18 (2006.01); B29C 48/00 (2019.01); B29C 48/08 (2019.01); C08G 63/183 (2006.01); C08J 3/12 (2006.01); C08J 3/20 (2006.01); C08J 11/06 (2006.01); C08J 11/10 (2006.01); C08K 3/04 (2006.01); C08K 3/22 (2006.01); C08K 3/26 (2006.01); C08K 3/30 (2006.01); C08K 3/36 (2006.01); C08K 5/098 (2006.01); C08L 25/06 (2006.01); C08L 33/08 (2006.01); C08L 67/02 (2006.01); C08L 67/03 (2006.01)
CPC C08J 5/18 (2013.01) [B29C 48/022 (2019.02); C08G 63/183 (2013.01); C08J 3/12 (2013.01); C08K 3/041 (2017.05); C08K 3/042 (2017.05); C08K 3/26 (2013.01); C08K 3/30 (2013.01); C08K 3/36 (2013.01); C08K 5/098 (2013.01); C08L 25/06 (2013.01); C08L 33/08 (2013.01); C08L 67/025 (2013.01); B29C 48/00 (2019.02); B29C 48/08 (2019.02); C08G 2230/00 (2013.01); C08J 3/20 (2013.01); C08J 3/201 (2013.01); C08J 11/06 (2013.01); C08J 11/10 (2013.01); C08K 3/04 (2013.01); C08K 3/22 (2013.01); C08K 2003/265 (2013.01); C08K 2003/3045 (2013.01); C08K 2201/005 (2013.01); C08L 67/02 (2013.01); C08L 67/03 (2013.01); C08L 2203/16 (2013.01); C08L 2203/30 (2013.01); C08L 2205/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for manufacturing a black polyester film, comprising:
providing a recycled polyester material, wherein the recycled polyester material is recycled PET (r-PET) bottle chip;
physically processing a part of the recycled polyester material and granulating the same to obtain a plurality of physically recycled polyester chips;
chemically processing another part of the recycled polyester material and granulating the same to obtain a plurality of chemically recycled polyester chips, wherein the plurality of chemically recycled polyester chips further include chemically recycled electrostatic pinning polyester chips, and wherein the chemically recycled electrostatic pinning polyester chips contain at least one kind of electrostatic pinning additives, and the electrostatic pinning additives are metal salts; and
mixing the plurality of physically recycled polyester chips and the plurality of chemically recycled polyester chips, and melt extruding the same to form a polyester film;
wherein, based on a total content of the polyester film as a whole being 100 parts by weight, a content of the chemically recycled electrostatic pinning polyester chips is between 5 and 35 parts by weight;
wherein the method further comprises: in the step of physically processing the part of the recycled polyester material, adding a black additive to the recycled polyester material, so that the polyester film that is finally formed includes the black additive.