Code dating pva film
The invention concerns polyvinyl alcohol (PVA) compositions for the use in pharmaceutical, veterinary, food, cosmetic or other products like films for wrapping food, aspics or jellies, preferably for predosed formulations like soft or hard capsules.
Compared with hard gelatine capsules (HGC) capsule...
A package containing water soluble or dispersible dry solid material and formed from material consisting essentially of a coherent self-supporting water soluble film comprising a uniform mixture of water soluble polyvinyl alcohol which is about 79% to about 95% hydrolyzed polyvinyl-acetate and has a weight average molecular weight of about 10,000 to about 50,000, and polyacrylic acid having a weight average molecular weight of about 30,000 to 400,000 in a weight ratio of about 10:1 to about 1:1.5. Accordingly, partially hydrolyzed polyvinyl alcohol having a degree of hydrolysis of from about 79% to about 95%, preferably from about 85% to 90%, especially preferably from about 86% to 89% is used as the water soluble polyvinyl alcohol component of the polymer blend.
The rate of disintegration in cold water of water soluble packaging films is improved by incorporating into a film forming polymer composition, to form a dry blend or aqueous dispersion, a substantially water insoluble cellulose material prepared from alkali metal salts of carboxy(lower alkyl) cellulose...
, wherein the hydrocolloids of the setting system are selected from alginates, agar gum, guar gum, locust bean gum (carob), carrageenan, tara gum, gum arabic, ghatti gum, Khaya grandifolia gum, tragacanth gum, karaya gum, pectin, arabian (araban), xanthan, gellan, starch, Konjac mannan, galactomannan, or funoran.
, wherein the polyvinyl alcohol is contained in an amount of 90 to 97% by weight by a water content of 2 to 7% by weight and the hydrocolloids are contained in an amount of 0.01 to 10%, preferably 0.05 to 5% by weight and cations in an amount of 0.001 to 5%, preferably 0.01 to 3% by weight.
wherein the coloring agent or mixture of coloring agents is selected from azo-, quinophthalone-, triphenylmethane-, xanthene- or indigoid dyes, iron oxides or hydroxides, titanium dioxide or natural dyes.
Films which are rapidly soluble in cold and warm water are formed from blends of water soluble polyvinyl alcohol (partially hydrolyzed polyvinyl acetate) and polyacrylic acid. The amount of the anti-foam agent is not especially critical and generally only that amount which is effective to suppress foaming of the polyvinyl alcohol during the preparation of the film casting solution will be used.
This report divides polyvinyl alcohol films market by water soluble and polarizer applications.
For water soluble application, the market is further segmented into detergent, agrochemical, water treatment chemical, embroidery, dyes, and laundry bags applications.