| 专利名称 | Method of preparation for a degradable, water and oil resistant protective membrane | 申请号 | US20020072249 | 专利类型 | US | 公开（公告）号 | US2003018162 | 公开（授权）日 | 2003.01.23 | 申请（专利权）人 | 中国科学院长春应用化学研究所 | 发明（设计）人 | ZHAO XIAOJIANG (CN); WANG XIANHONG (CN); WANG FOSONG (CN) | 主分类号 | C08G2/00 | IPC主分类号 | C08G2/00 | 专利有效期 | Method of preparation for a degradable, water and oil resistant protective membrane 至Method of preparation for a degradable, water and oil resistant protective membrane | 法律状态 | 说明书摘要 | The present invention provides a method of preparation for a degradable, water and oil resistant protective membrane. In the said method, carbon dioxide copolymer is dissolved in a low toxic or non-toxic solvent to form a solution of 3-6 wt % concentration. After standing and filtration to remove metal oxide, the solution is used to coat the surface of the fabricated starch, paper pulp, or straw tableware by spraying or dipping. The residual solvent is removed by drying process and a degradable, water and oil resistant and transparent protective membrane is obtained. The thickness of the protective membrane is in the range of 10-20 micrometer. Metal ion content is lower than 1 ppm. No leakage and deformation of the tableware are observed after the tableware is immerged in water or edible oil for 4 hours at 80 DEG C. The decoloration test by cold edible oil and ethanol is negative. Fungus test gives grade V. |
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