Body coated by multi-layer polymer, and method for cultivating plant

A multi-layer polymer coating system with temperature-sensitive outer and inner layers controls germination timing, addressing labor and productivity issues in cold regions by allowing autumn sowing and spring germination.

WO2026141387A1 Publication Date: 2026-07-02NAT UNIV CORP HOKKAIDO HIGHER EDUCATION & RES SYST
6 Cites 0 Cited by

Patent Information

Application Number
PCT/JP2025/045061
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-12-27
Filing Date
2025-12-23
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing seed coating technologies fail to control germination timing effectively, leading to uneven germination and increased labor and costs due to labor shortages and aging farmers, especially in cold regions like Hokkaido, where direct seeding in autumn results in germination before winter.

Method used

A multi-layer polymer coating system with an outer layer transitioning at lower temperatures (LCST) to protect seeds until winter and an inner layer that allows germination at optimal spring temperatures, using polyvinyl ether with hydroxyl groups and controlled viscosity and molecular weight for precise timing.

Benefits of technology

Enables controlled germination in spring after overwintering, reducing labor and increasing productivity by allowing autumn sowing, and ensuring consistent germination timing across varying soil conditions.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The present invention provides a body coated by a multi-layer polymer that can be germinated under an increased air temperature condition after dormancy, even when sown during autumn which is an agricultural off-season. Provided is a body coated by a multi-layer polymer coating which is a coated body obtained by coating at least two layers of polymer onto a coating target body, said body coated by a multi-layer polymer coating being characterized in that an outer coating layer including at least one inner coating layer on an inner side is formed from a polymer exhibiting lower limit critical temperature (LCST) characteristics after being subjected to a phase transition at a temperature lower than the softening temperature of the polymer forming the inner coating layer.
Need to check novelty before this filing date? Find Prior Art