WATER-SOLUBLE POLYVINYL ALCOHOL FILM WITH PLASTICIZER BLEND, RELATED METHODS, AND RELATED ARTICLES

• Main Authors: FLORENCE CATHERINE COURCHAY, LABEQUE REGINE, STEVEN G FRIEDRICH, DAVID M LEE
• Format: Patent
• Language: English; Japanese
• Published: 26.11.2020
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

To provide water-soluble films which provide strong film seals to retain their water-solubility characteristics.SOLUTION: Disclosed herein are water-soluble films including a polyvinyl alcohol (PVOH) polymer and a combination of at least three plasticizers. The combination of plasticizers includes dipropylene glycol as a first plasticizer, a sugar alcohol such as sorbitol as a second plasticizer, and a polyol such as glycerin as a third plasticizer. When the PVOH polymer and plasticizers are blended in particular proportions and/or selected with regard to various criteria related to physical and chemical film properties, the resulting water-soluble film formed from the PVOH resin blend exhibits beneficial combinations (four) of aged tensile strength, aged melting transition delta elevation, aged adhesion value, and/or resistance to seal peeling, which provide strong film seals to retain their water-solubility characteristics.SELECTED DRAWING: Figure 1 【課題】強いフィルムシールをもたらし、その水溶解性特性を保持する水溶性フィルムの提供。【解決手段】ポリビニルアルコール（ＰＶＯＨ）ポリマーと、少なくとも３つの可塑剤の組み合わせとを含む水溶性フィルムが本明細書において開示される。可塑剤の組み合わせは、第１の可塑剤としてのジプロピレングリコールと、第２の可塑剤としてのソルビトールなどの糖アルコールと、第３の可塑剤としてのグリセリンなどのポリオールとを含む。ＰＶＯＨポリマー及び可塑剤が特定の比率でブレンドされ、かつ／又は物理的及び化学的フィルム特性に関連する各種基準に関して選択されるとき、当該ＰＶＯＨ樹脂ブレンドから形成して得られた水溶性フィルムは、強いフィルムシールをもたらし、その水溶解性特性を保持する、老化後引張強度、老化後融解転移デルタ上昇、老化後接着値及び／又はシール剥離耐性の有益な組み合わせ４つ）を示す。【選択図】図１