Nursery pot body with temporal stability and decomposition accelerating method therefor

Patent metadata

Field	Value
Publication number	US-12532816-B2
Application number	US-202117759948-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Feb 3, 2020
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

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

The invention claimed is:

1 . A base paper for a nursery pot body with a paper substrate on which a biodegradable resin composition is laminated, wherein
the nursery pot body made of the base paper is subject to an enzyme treatment immediately before planting in a field so as to accelerate decomposition of the nursery pot body, the biodegradable resin composition contains a polylactic acid resin as a resin (A), the biodegradable resin composition being laminated on the paper substrate and polybutylene succinate (PBS) 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.

2 . The base paper for a nursery pot body according to claim 1 , 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.

3 . A nursery pot body, comprising the base paper for a nursery pot body according to claim 1 .

4 . 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 3 so as to biodegrade the nursery pot body.

5 . The method for decomposing the nursery pot body according to claim 4 , 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
• Nippon Beet Sugar Mfg

Inventors

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

Classifications

• B32B2307/7163

  Biodegradable · CPC title

• B32B2270/00

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

• B32B27/36

  comprising polyesters · CPC title

• B32B27/10

  of paper or cardboard · CPC title

• B32B27/08

  of synthetic resin · CPC title