USE OF POLYLACTIDE AND METHOD OF MANUFACTURING A HEAT-SEALED PAPER OR BOARD CONTAINER OR PACKAGE

• Main Authors: NEVALAINEN KIMMO, KYLLIAINEN OUTI, ROSLING ARI, RASANEN JARI, KHAJEHEIAN MOHAMMAD, RIBU VILLE, LINDSTROM ELLA
• Format: Patent
• Language: English; Korean
• Published: 28.09.2016
• Subjects: IMPREGNATING OR COATING OF PAPER; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

본 발명은 스토브 또는 마이크로웨이브 오븐에서 가열되는 컨테이너 및 패키지의 제조에 의도되는 종이 또는 보드 상의 압출된 고분자 코팅으로서의 폴리락타이드(PLA)의 용도에 관한 것이다. 본 발명에 따르면 다관능성 가교제, 가령 트리알킬 이소시아누레이트(TAIC)가 PLA와 혼합되고, 압출된 코팅층이 가교 전자빔(EB) 조사를 받는다. PLA는 그대로 또는 또 다른 생분해성 폴리에스터, 가령 폴리부틸렌 석시네이트(PBS)와 혼합되어 사용될 수 있다. EB 조사는 종이 또는 보드 기판에 대한 코팅의 접착, 코팅의 열봉합성, 및 완성된 컨테이너 및 패키지의 내열성을 개선함이 발견되었다. The invention relates to use of polylactide (PLA) as an extruded polymer coating on paper or board intended for the production of containers and packages, which are heated in a stove or microwave oven. According to the invention a polyfunctional cross-linking agent, such as trialkyl isocyanurate (TAIC), is blended with PLA, and the extruded coating layer is subjected to cross-linking electron beam (EB) radiation. PLA may be used as such or blended with another biodegradable polyester such as polybutylene succinate (PBS). EB radiation has been found to improve adhesion of the coating to the paper or board substrate, heat-scalability of the coating, and heat-resistance of the finished containers and packages.