Nursery pot body with temporal stability and decomposition accelerating method therefor

Patent metadata

Field	Value
Publication number	US-2023077099-A1
Application number	US-202117759948-A
Country	US
Kind code	A1
Filing date	Feb 3, 2021
Priority date	Feb 3, 2020
Publication date	Mar 9, 2023
Grant date	—

Abstract

[Problem to be Solved] Provided is a nursery pot body having stability over time, exhibiting suppressed decomposition during seedling raising, maintaining sufficient strength at the time of planting, and being rapidly degraded after planting in a field through enzyme treatment immediately before and/or immediately after planting.[Solution] Base paper for a nursery pot body is characterized in that a biodegradable resin layer is provided on at least one surface of a paper substrate, wherein the biodegradable resin layer contains at least 15 mass % of a polylactic acid relative to 100 mass % of a biodegradable resin composition, and a nursery pot body is produced by molding the base paper.

First claim

1 .- 11 . (canceled)

12 . A base paper for a nursery pot body, wherein
a biodegradable resin composition containing a polylactic acid resin as a resin (A) is laminated on a paper substrate,
the biodegradable resin composition contains an aliphatic polyester resin other than the polylactic acid resin, the aliphatic polyester resin being defined as a resin (B),
a mass ratio between the resin (A) and the resin (B) is 20:80 to 30:70, and
a thickness of the biodegradable resin layer to be laminated on the paper substrate is 20 μm to 35 μm.

13 . A base paper for a nursery pot body, wherein
a biodegradable resin composition containing a polylactic acid resin as a resin (A) is laminated on a paper substrate,
the biodegradable resin composition contains an aliphatic polyester resin other than the polylactic acid resin, the aliphatic polyester resin being defined as a resin (B), and contains an aromatic polyester resin as a resin (C),
the resin (A) is contained in an amount ranging from 20 mass % to 30 mass % relative to the total mass of the biodegradable resin composition,
the resin (B) is contained in an amount ranging from 55 mass % to 72 mass % relative to the total mass of the biodegradable resin composition,
the resin (C) is contained in an amount ranging from 8 mass % to 15 mass % relative to the total mass of the biodegradable resin composition, and
a thickness of the biodegradable resin layer to be laminated on the paper substrate is 20 μm to 35 μm.

14 . The base paper for a nursery pot body according to claim 12 , wherein the resin (A) is a polylactic acid.

15 . The base paper for a nursery pot body according to claim 12 , wherein the resin (B) is an aliphatic polyester resin prepared by polycondensing a dicarboxylic acid component comprising an aliphatic dicarboxylic acid and a diol component comprising an aliphatic diol.

16 . The base paper for a nursery pot body according to claim 12 , wherein the resin (B) is at least one type selected from polybutylene succinate (PBS), polybutylene succinate adipate (PBSA) and polyhydroxybutyrate.

17 . The base paper for a nursery pot body according to claim 13 , wherein the resin (C) is an aromatic polyester resin prepared by polycondensing a dicarboxylic acid component comprising an aliphatic dicarboxylic acid and an aromatic dicarboxylic acid and a diol component comprising an aliphatic diol.

18 . The base paper for a nursery pot body according to claim 13 , wherein the resin (C) is polybutylene adipate terephthalate (PBAT).

19 . A nursery pot body, comprising the base paper for a nursery pot body according to claim 12 .

20 . A method for decomposing a nursery pot body with a step of bringing a biodegradable resin-decomposing enzyme into contact with the nursery pot body according to claim 19 so as to biodegrade the nursery pot body.

21 . The method for decomposing the nursery pot body according to claim 20 , wherein the biodegradable resin-decomposing enzyme is a biodegradable resin-decomposing enzyme produced by at least one type of microorganisms selected from the group consisting of a yeast of the genus Pseudozyma, a yeast of the genus Cryptococcus, a filamentous fungus of the genus Acremonium, a filamentous fungus of the genus Alternaria, a filamentous fungus of the genus Arthrinium, a filamentous fungus of the genus Aureobasidium, a filamentous fungus of the genus Cladosporium, a filamentous fungus of the genus Epicoccum, a filamentous fungus of the genus Fusarium, a filamentous fungus of the genus Paraphoma and a filamentous fungus of the genus Penicillium.

Assignees

• Nippon Beet Sugar Manfacturing Co Ltd
• Toppan Inc
• Nat Agriculture & Food Res Org
• Goyo Paper Working Co Ltd

Inventors

• Nakagawa Takuya
• Ota Yasuomi
• Kawamura Naohiro
• Sasaki Tokuya
• Kitamoto Hiroko
• Nakamoto Michinori

Classifications

• A01G9/0291 Primary

  Planting receptacles specially adapted for remaining in the soil after planting · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• B32B2307/7163

  Biodegradable · CPC title

• C08J11/105

  by treatment with enzymes · CPC title

• C09D167/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence) · CPC title