US 12,247,109 B2
Biodegradable polymeric substrate and a method of producing the substrate
Ashok Chaturvedi, New Delhi (IN)
Appl. No. 17/288,183
Filed by Ashok Chaturvedi, New Delhi (IN)
PCT Filed Oct. 19, 2019, PCT No. PCT/IN2019/050772
§ 371(c)(1), (2) Date Apr. 23, 2021,
PCT Pub. No. WO2020/084632, PCT Pub. Date Apr. 30, 2020.
Prior Publication US 2021/0403663 A1, Dec. 30, 2021
Int. Cl. C08J 7/06 (2006.01); B65D 65/40 (2006.01); B65D 65/42 (2006.01); B65D 65/46 (2006.01); C08J 7/18 (2006.01); C09D 7/20 (2018.01); C09D 189/00 (2006.01); B29C 71/02 (2006.01)
CPC C08J 7/06 (2013.01) [B65D 65/40 (2013.01); B65D 65/42 (2013.01); B65D 65/466 (2013.01); C08J 7/18 (2013.01); C09D 7/20 (2018.01); C09D 189/00 (2013.01); C08J 7/08 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of making a non-biodegradable flexible packaging substrate web biodegradable, the method comprising:
(a) providing the substrate web from an unwind to a coating station, wherein the substrate web comprises multiple polymeric layers;
(b) applying a thin layer of uniform deposition of an enzyme based coating on only an outermost exterior surface of the substrate web partially or completely by the coating station;
(c) curing the enzyme based coating applied on the substrate web by a curing unit, wherein the curing unit is one of:
(i) a hot air blower; or
(ii) an electron beam radiation source; or
(iii) a UV lamp/LED radiation source; and
(d) collecting the coated substrate web in roll at rewind,
wherein:
the thin layer of uniform deposition of the enzyme based coating is from 0.01 gsm to 10 gsm; and
the enzyme based coating is configured to attract microorganisms to the outermost exterior surface of the substrate web, whereby the microorganisms colonize on the outermost exterior surface of the substrate web and secrete acids and/or enzymes that break down polymer chains of the substrate web to cause biodegradation of the substrate web.