02-04-2020 дата публикации
Номер: US20200102434A1
Автор:
Steven G. Friedrich,
David M. Lee,
Regine Labeque,
Florence Catherine Courchay,
FRIEDRICH STEVEN G,
LEE DAVID M,
LABEQUE REGINE,
COURCHAY FLORENCE CATHERINE,
Friedrich, Steven G.,
Lee, David M.,
Labeque, Regine,
Courchay, Florence Catherine
Принадлежит:
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 that retain their water-solubility characteristics. 1. A water-soluble film comprising:a polyvinyl alcohol (PVOH) polymer;dipropylene glycol as a first plasticizer;a sugar alcohol as a second plasticizer, the sugar alcohol being selected from the group consisting of isomalt, maltitol, sorbitol, xylitol, erythritol, adonitol, dulcitol, pentaerythritol, and mannitol; anda polyol as a third plasticizer, the third plasticizer being different from the first plasticizer and the second plasticizer and being selected from the group consisting of glycerin, diglycerin, ethylene glycol, diethylene glycol, triethyleneglycol, tetraethylene glycol, polyethylene glycols up to 400 MW, neopentyl glycol, propylene glycol, 2-methyl-1,3-propanediol, trimethylolpropane, and polyether polyols;wherein the first, second, and third plasticizers are present in the water-soluble film in a combined amount in a range of about 5 parts to about 50 parts total plasticizer per 100 parts total resin (phr) in the water-soluble film.2. (canceled)3. The water-soluble film of claim 1 , wherein the sugar alcohol is sorbitol.4. (canceled)5. The water-soluble film of claim 1 , wherein the polyol is glycerin.6. The water-soluble film of claim 1 , wherein ...
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