US5225288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent blockers and multilayer barrier coatings for thin films
Assignee: EIDP Inc
•
Filing: 1992-05-21
•
Granted: 1993-07-06
•
Expires: 2012-05-21
Abstract
Abstract A film comprising alternating layers of polyvinylidene chloride resin and a solvent barrier such as polyvinyl alcohol provides superior barrier properties. Barrier and mechanical properties are enhanced when formulation additives are present at customary levels only in the outermost layers.
Inventors
- 👤 Charles L. Beeson
- 👤 Raymond T. Cole
- 👤 Gedeon I. Deak
- 👤 Herbeson H. Leidolf, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:27
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/56; B05D7/58; B05D7/584; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/048; C08J7/052; B05D2201/00; B05D2201/02; B05D2451/00; C08J2423/00; C08J2423/02; C08J2423/04; C08J2423/06; C08J2427/00; C08J2427/02; C08J2427/04; C08J2427/08; C08J2467/00; C08J2467/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31888; Y10T428/31891; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
A coated film having good barrier and handling properties, comprising: (a) a substrate film; (b) at least one underlayer of vinylidene chloride polymer containing less than about 3 weight percent organic formulation additives; and (c) at least one overlayer of vinylidene chloride polymer containing at least about 3 weight percent organic formulation additives.
Claim 2
Dependent Claim
53 words
A coated film having good barrier and handling properties, comprising: (a) a substrate film; (b) at least one underlayer of vinylidene chloride polymer containing less than about 3 weight percent organic formulation additives; and (c) at least one overlayer of vinylidene chloride polymer containing at least about 3 weight percent organic formulation additives.
Claim 3
Dependent Claim
20 words
The film of claim 1 wherein the underlayer of (b) contains less than about 1 weight percent organic formulation additives.
Claim 4
Dependent Claim
20 words
The film of claim 1 wherein the underlayer of (b) contains less than about 0.5 weight percent organic formulation additives.
Claim 5
Dependent Claim
16 words
The film of claim 1 further comprising at least one intermediate layer of vinyl alcohol polymer.
Claim 6
Dependent Claim
56 words
A coated film having good barrier, handling, and adhesive properties, comprising: (a) a substrate film; (b) at least one underlayer of a vinylidene chloride polymer containing less than about 3 weight percent organic formulation additives; and (c) at least one overlayer of a heat sealable thermoplastic polymer which adheres to said underlayer of vinylidene chloride polymer.
Claim 7
Dependent Claim
56 words
A coated film having good barrier, handling, and adhesive properties, comprising: (a) a substrate film; (b) at least one underlayer of a vinylidene chloride polymer containing less than about 3 weight percent organic formulation additives; and (c) at least one overlayer of a heat sealable thermoplastic polymer which adheres to said underlayer of vinylidene chloride polymer.
Claim 8
Dependent Claim
18 words
The coated film of claim 5 wherein the overlayer is a copolymer of ethylene and a copolymerizable ester.
Claim 9
Dependent Claim
14 words
The coated film of claim 5 wherein the overlayer is ethylene vinyl acetate copolymer.
Claim 10
Dependent Claim
12 words
The coated film of claim 5 wherein the overlayer is a copolyester.
Claim 11
Dependent Claim
28 words
The coated film of claim 5 wherein the overlayer is a condensation polymer composed of ethylene glycol and 40/60 to 60/40 mole mixture of azelaic and terephthalic acids.
References Cited (Backward Citations)
US3577508A
Cited
US3950579A
Cited
US3956544A
Cited
US3988500A
Cited
US3959526A
Cited
JPS59152929A
Cited
US4565742A
Cited
US4591887A
Cited
US4741970A
Cited
US4781978A
Cited
US5102699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |