IMPROVED WATER-SOLUBLE FILM HAVING BLEND OF PVOH POLYMERS, AND PACKETS MADE THEREFROM

• Main Authors: SHI JICHUN, ANDREW P VERRALL, FRANK WILLIAM DENOME, FRIEDRICH STEVEN G, REGINE LABEQUE, DAVID M LEE, ROXANNE ROSMANINHO
• Format: Patent
• Language: English; Japanese
• Published: 23.04.2015
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; CANDLES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; DETERGENT COMPOSITIONS; DETERGENTS; FATTY ACIDS THEREFROM; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; RECOVERY OF GLYCEROL; RESIN SOAPS; SOAP OR SOAP-MAKING; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF SINGLE SUBSTANCES AS DETERGENTS; WORKING-UP

PROBLEM TO BE SOLVED: To provide plasticized water-soluble films having favorable cold-water solubility, water-drop resistance, wet handling, and thermoforming characteristics.SOLUTION: Water-soluble films include a PVOH resin formed with a blend of two or more PVOH polymers each having a monomodal molecular weight distribution, in which the PVOH resin has viscosity in a range of about 13.5 cP to about 20 cP (or a corresponding weight average molecular weight), a degree of hydrolysis of about 84% to about 92%, a polydispersity index value in a range of about 1 to about 5, a residual water content of about 4 wt.% to about 10 wt.%, and a resin selection index value in a range of 0.255 to 0.315. Methods of making the films, and compositions including PVOH resins for making the films are also provided. In a pouch, the PVOH resin has a first PVOH polymer having viscosity of about 8 cp to about 40 cP, and a second PVOH polymer having viscosity of about 10 cp to 40 cP; and the film further has 30 wt.% or lower of PVOH polymer having viscosity less than about 11 cP. 【課題】有利な冷水溶解度特性と、水滴抵抗性と、湿潤時の取り扱い性と、熱成形特性と、を有する可塑化水溶性フィルムの提供。【解決手段】水溶性フィルム、それぞれが単峰性分子量分布を有する２種以上のＰＶＯＨポリマーの配合物で形成されるＰＶＯＨ樹脂を含み、ＰＶＯＨ樹脂は、約１３．５〜約２０ｃＰの範囲内の粘度（又は対応する重量平均分子量）、約８４〜約９２％の加水分解度、約１〜約５の範囲内の多分散指数値、約４〜約１０重量％の残留含水量、及び０．２５５〜０．３１５の範囲内の樹脂選択指数値を保持しうる、水溶性フィルム、フィルムの製造方法、フィルムを製造するためのＰＶＯＨ樹脂を含む組成物。前記ＰＶＯＨ樹脂が約８〜約４０ｃＰの粘度を有する、第１ＰＶＯＨポリマーと約１０〜４０ｃＰの粘度を有する第２ＰＶＯＨポリマーを有し、前記フィルムが更に約１１ｃＰ低い粘度を有するＰＶＯＨポリマーを３０重量％以下含有するパウチ。【選択図】なし