BIODEGRADABLE ADHESIVE AND SHEET

• Main Authors: HARA KENICHI, AKAGI TASUKE
• Format: Patent
• Language: English; Japanese
• Published: 29.10.2020
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

To provide a biodegradable adhesive which has biodegradability because of use of a biodegradable material, is excellent in film formation property in a laminate method, and exhibits excellent adhesive strength and easy openability, especially, a biodegradable adhesive which has an adhesive strength and is excellent in easy openability in low-temperature heat sealing, and a sheet having an adhesive layer formed of the adhesive.SOLUTION: A biodegradable adhesive contains at least one resin (A) selected from a group consisting of polybutylene succinate and polybutylene succinate adipate, and a polylactic acid (B). The biodegradable adhesive contains 65-80 mass% of the resin (A) and 20-35 mass% of the polylactic acid (B), and the polylactic acid (B) has a melt flow rate of 1-30 g/10 min and a melting point of 40-70°C.SELECTED DRAWING: None 【課題】本発明が解決しようとする課題は、生分解性材料を使用しているため生分解性を有しており、さらに、ラミネート法での成膜性に優れ、且つ、優れた接着強度と易開封性を示す生分解性接着剤、特に低温ヒートシール時でも接着強度を有し易開封性に優れる生分解性接着剤、及び該接着剤より形成される接着剤層を有するシートを提供することにある。【解決手段】上記課題は、ポリブチレンサクシネート及びポリブチレンサクシネートアジペートからなる群から選ばれる少なくとも１種の樹脂（Ａ）と、ポリ乳酸（Ｂ）とを含む生分解性接着剤であって、前記生分解性接着剤は、樹脂（Ａ）を６５〜８０質量％、ポリ乳酸（Ｂ）を２０〜３５質量％含有し、前記ポリ乳酸（Ｂ）のメルトフローレートが１〜３０ｇ／１０分であり、融点が４０〜７０℃である、生分解性接着剤によって解決される。【選択図】なし