Packaging film and packaging of detergent compositions therewith
AssigneeLever Brothers Company
InventorZia Haq
Life of this patent
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Abstract
A packaging film comprises a base film of at least partially water-soluble plastics film, for example, polyvinyl alcohol, carrying on one side a protective layer of particulate inert plastics material, for example, polytetrafluoroethylene powder, having a high water repellency. The film is thus vulnerable to attack by aqueous media on one side and protected against such attack on the other. It may be used, with the protected side innermost, for unit packaging of detergent compositions, especially liquids containing bleach. In use in the washing machine, the unprotected surface is attacked by the wash liquor to release the contents; the protective layer prevents attack of the package by the contents during storage.
Claims21
A package consisting wholly or partially of plastics film material at least partially soluble in water, wherein said film is provided on its inside surface with a protective layer, in particulate form, of an inert plastics material having a contact angle to water of at least 80.degree., whereby said inside surface is protected from attack by aqueous media while said film on its outside surface is vulnerable to attack by aqueous media.
A packaging film comprising a base film of at least partially water-soluble plastics material carrying on one surface a protective layer, in particulate form, of an inert plastics material having a contact angle to water of at least 80.degree., said layer being effective to protect said base film surface from attack by aqueous media.
Dependencies are inferred from the claim text.