US4416791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging film and packaging of detergent compositions therewith
Assignee: Lever Brothers Co
•
Filing: 1982-10-28
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Granted: 1983-11-22
•
Expires: 2002-10-28
Abstract
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.
Inventors
- 👤 Zia Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:47
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/04; C11D17/041; C11D17/042; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J2300/00; C08J2300/10; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1341
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
72 words
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°, 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.
Claim 2
Dependent Claim
72 words
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°, 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.
Claim 3
Dependent Claim
12 words
The package of claim 1, wherein said film is of thermoplastic material.
Claim 4
Dependent Claim
24 words
The package of claim 1, wherein said film is of material selected from the group consisting of polyvinyl alcohols and partially hydrolysed polyvinyl acetates.
Claim 5
Dependent Claim
22 words
The package of claim 1, wherein said protective layer is of material having a contact angle to water of at least 90°.
Claim 6
Dependent Claim
22 words
The package of claim 4, wherein said protective layer is of material having a contact angle to water of at least 100°.
Claim 7
Dependent Claim
27 words
The package of claim 1, wherein said protective layer comprises particles of a material selected from the group consisting of polyfluorocarbons, polystyrene, polyvinyl chloride, polyethylene and polypropylene.
Claim 8
Dependent Claim
13 words
The package of claim 6, wherein said protective layer comprises particles of polytetrafluoroethylene.
Claim 9
Dependent Claim
43 words
The package of claim 1, wherein said outside surface of said film is provided with a light coating of an inert water-repellent plastics material in an amount insufficient to protect that surface from attack by aqueous media, whereby tackiness in handling is reduced.
Claim 10
Dependent Claim
19 words
The package of claim 1, which comprises a sachet formed from one or more sheets of the said film.
Claim 11
Dependent Claim
18 words
The package of claim 9, wherein said film is thermoplastic and said sachet is joined together by heat-sealing.
Claim 12
Dependent Claim
13 words
The package as claimed in of claim 1, which contains a detergent composition.
Claim 13
Dependent Claim
26 words
The package of claim 1, which contains an at least partially liquid composition capable of attacking the material of said at least partially water-soluble plastics film.
Claim 14
Dependent Claim
10 words
The package of claim 1, which contains a bleaching agent.
Claim 15
Dependent Claim
54 words
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°, said layer being effective to protect said base film surface from attack by aqueous media.
Claim 16
Dependent Claim
54 words
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°, said layer being effective to protect said base film surface from attack by aqueous media.
Claim 17
Dependent Claim
13 words
The film of claim 14, wherein said base film is of thermoplastic material.
Claim 18
Dependent Claim
26 words
The film of claim 14, wherein said base film is of a material selected from the group consisting of polyvinyl alcohols and partially hydrolysed polyvinyl acetates.
Claim 19
Dependent Claim
22 words
The film of claim 14, wherein said protective layer is of material having a contact angle to water of at least 90°.
Claim 20
Dependent Claim
22 words
The film of claim 17, wherein said protective layer is of material having a contact angle to water of at least 100°.
Claim 21
Dependent Claim
27 words
The film of claim 14, wherein said protective layer comprises particles of a material selected from the group consisting of polyfluorocarbons, polystyrene, polyvinyl chloride, polyethylene and polypropylene.
Claim 22
Dependent Claim
13 words
The film of claim 19, wherein said protective layer comprises particles of polytetrafluoroethylene.
Claim 23
Dependent Claim
42 words
The film of claim 14, wherein that surface of said base film not carrying said protective layer is provided with a light coating of an inert water-repellent plastics material in an amount insufficient to protect that surface from attack by aqueous media.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |