	US 12,077,702 B2
	Biodegradable coating composition for mulching paper and mulching paper
Hyun Hwang Choi, Daejeon (KR)
Assigned to PAPYRUS CO., LTD, Daejeon (KR)
Appl. No. 17/417,511
Filed by PAPYRUS CO., LTD, Daejeon (KR)
PCT Filed Sep. 19, 2019, PCT No. PCT/KR2019/012123 § 371(c)(1), (2) Date Jun. 23, 2021, PCT Pub. No. WO2020/138655, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 10-2018-0169023 (KR), filed on Dec. 26, 2018.
Prior Publication US 2021/0388267 A1, Dec. 16, 2021
Int. Cl. C09K 17/52 (2006.01); D21H 19/40 (2006.01); D21H 19/54 (2006.01); D21H 19/56 (2006.01); D21H 19/62 (2006.01); D21H 21/20 (2006.01)

CPC C09K 17/52 (2013.01) [D21H 19/40 (2013.01); D21H 19/54 (2013.01); D21H 19/56 (2013.01); D21H 19/62 (2013.01); D21H 21/20 (2013.01)]

9 Claims

1. A biodegradable coating composition to be coated on a surface of mulching paper, the biodegradable coating composition comprising:

45 to 72 parts by weight of spring water, wherein the spring water includes mineral components prepared by immersing mineral substance powder with a particle size distribution of 400 to 700 mesh in a container containing water for 10 to 20 days, and the mineral substance powder includes sericite powder;

3 to 8 parts by weight of charcoal powder having a particle size of 1,000 to 3,000 mesh;

8 to 13 parts by weight of calcium solution;

5 to 15 parts by weight of a filler, wherein the filler includes sulfur powder, illite powder, and expanded vermiculite powder;

5 to 8 parts by weight of starch; and

10 to 20 parts by weight of an additive.