Method for manufacturing a molded body, and molded body
By preheating and molding poly(3-hydroxybutyrate) resin within a controlled temperature range, the method addresses cracking issues, resulting in a crack-free, biodegradable, and heat-resistant resin layer for packaging.
JP7888366B2Active Publication Date: 2026-07-13KANEKA CORP
Patent Information
- Application Number
- JP2022099231
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-06-20
- Publication Date
- 2026-07-13
- Estimated Expiration
- 2042-06-20
AI Technical Summary
Technical Problem
Poly(3-hydroxybutyrate) resins, despite their heat resistance, suffer from poor mechanical strength and are prone to cracking during secondary processing, leading to issues like leakage in molded bags or containers.
Method used
A manufacturing method involving preheating the poly(3-hydroxybutyrate) resin layer to a specific temperature range and molding it within that range, using differential scanning calorimetry to control the crystal melting curve, thereby suppressing cracks.
Benefits of technology
The method produces a molded article with a poly(3-hydroxybutyrate) resin layer free from cracks, offering excellent biodegradability and heat resistance for packaging materials.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 0007888366000002 
Figure 0007888366000003 
Figure 0007888366000004
Abstract
To provide a molded article having no crack in a resin layer, including a laminate having a resin layer containing a poly(3-hydroxybutyrate) resin.SOLUTION: In a method for manufacturing a molded article obtained by processing a laminate having at least a base material layer and a resin layer containing a poly(3-hydroxybutyrate) resin on at least one top surface of the base material layer, wherein the resin layer has at least one peak top temperature (Tma) at a range of 100 to 155°C by a crystal melting curve by differential scanning calorimetry, at least following steps (A) and (B) are performed sequentially. In the step (A), a surface temperature of the resin layer is adjusted to a temperature within a range of (Tma-20°C) to (Tma+25°C). In the step (B), the laminate is positioned so that the resin layer is in contact with a molding die during molding, and at least a part of the laminate is bent and molded while the surface temperature of the resin layer is 50 to 80°C.SELECTED DRAWING: Figure 3
Need to check novelty before this filing date? Find Prior Art
Citation Information
Patent Citations
Plastic paper container
JP1994278741A
Biodegradable laminate
JP1998128920A
Polyhydroxybutyrate resin composition
JP2008195817A
Aliphatic polyester resin composition and aliphatic polyester resin molded body
WO2015052876A1
Method for manufacturing biodegradable laminate
WO2019239913A1