US4552801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasticized EVOH and process and products utilizing same
Assignee: Rexam Beverage Can Co
•
Filing: 1984-06-20
•
Granted: 1985-11-12
•
Expires: 2004-06-20
Abstract
Abstract An EVOH copolymer blend is extrudable to produce films of uniform caliper and excellent oxygen barrier properties. Aromatic sulfonamides are desirably utilized as plasticizers, and superior composite films including a layer of the plasticized EVOH are produced.
Inventors
- 👤 Thomas W. Odorzynski
- 👤 II Jack E. Knott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; B; B32; B32B; B32B27/00; B32B27/32; C08K5/36; C08K5/43; C08L; C08L29/00; C08L29/02; C08L29/04; C08L39/00; C08L39/04; C08L39/06; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/2852; Y10T428/2878; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
As a composite film of relatively uniform caliper, a coextrudate comprised of successive first through fifth layers of: (1) film-forming polyamide resin, (2) a blend of about 95 to 80 weight percent of at least one ethylene vinyl alcohol copolymer, and conversely about 5 to 20 weight percent of a plasticizer therefor, (3) film-forming polyamide resin, (4) adhesive and (5) ionomer resin, respectively, said film-forming polyamide resin having a molecular weight of about 20,000 to 30,000 and a melting point temperature of about 415 degrees to 440 degrees Fahrenheit, said EVOH copolymer having a molecular weight of about 15,000 to 30,000, a vinyl alcohol moiety content of about 60 to 75 percent thereof, and a melting point temperature of about 325 degrees to 375 degrees Fahrenheit, said adhesive layer comprising an anhydride modified polyolefin or a partially hydrolyzed ethylene vinyl acetate copolymer, and said plasticizer being an aromatic sulfonamide selected from the class consisting of o,p-toluene sulfonamide, N-ethyl-o,p-toluenesulfonamide and ethylbenzene sulfonamide.
Claim 2
Dependent Claim
161 words
As a composite film of relatively uniform caliper, a coextrudate comprised of successive first through fifth layers of: (1) film-forming polyamide resin, (2) a blend of about 95 to 80 weight percent of at least one ethylene vinyl alcohol copolymer, and conversely about 5 to 20 weight percent of a plasticizer therefor, (3) film-forming polyamide resin, (4) adhesive and (5) ionomer resin, respectively, said film-forming polyamide resin having a molecular weight of about 20,000 to 30,000 and a melting point temperature of about 415 degrees to 440 degrees Fahrenheit, said EVOH copolymer having a molecular weight of about 15,000 to 30,000, a vinyl alcohol moiety content of about 60 to 75 percent thereof, and a melting point temperature of about 325 degrees to 375 degrees Fahrenheit, said adhesive layer comprising an anhydride modified polyolefin or a partially hydrolyzed ethylene vinyl acetate copolymer, and said plasticizer being an aromatic sulfonamide selected from the class consisting of o,p-toluene sulfonamide, N-ethyl-o,p-toluenesulfonamide and ethylbenzene sulfonamide.
Claim 3
Dependent Claim
15 words
The film of claim 1 wherein said film is about three to five mils thick.
Claim 4
Dependent Claim
23 words
The film of claim 2 wherein said adhesive layer is itself a composite comprised of a core having exterior layers of said adhesive.
Claim 5
Dependent Claim
59 words
The film of claim 1 wherein the thickness of said EVOH layer (2), at any point across the width of said film, deviates by no more than about 40 percent from the mean thickness value of said layer, and wherein at least about 60 percent of said layer has a thickness within about 20 percent of said mean value.
Claim 6
Dependent Claim
182 words
As a composite film, a coextrudate comprised of successive layers of (1) film-forming polyamide resin, (2) a blend of about 90 weight percent of at least one ethylene vinyl alcohol copolymer and about 10 weight percent of a plasticizer therefor, and said plasticizer being an aromatic sulfonamide selected from the class consisting of o, p-toluene sulfonamide, N-ethyl-o, p-toluene sulfonamide and ethylbenzene sulfonamide and (3) film-forming polyamide resin, respectively, said film-forming polyamide resin having a molecular weight of about 20,000 to 30,000 and a melting point temperature of about 415 degrees to 440 degrees Fahrenheit, said EVOH copolymer having a molecular weight of about 15,000 to 30,000, a vinyl alcohol moiety content of about 60 to 75 percent thereof, and a melting point temperature of about 325 degrees to 375 degrees Fahrenheit, the thickness of said EVOH layer (2), at any point across the width of said film, deviating by no more than 50 percent from the mean thickness value of said layer, and at least about 60 percent of said layer having a thickness within about 20 percent of said mean value.
Claim 7
Dependent Claim
182 words
As a composite film, a coextrudate comprised of successive layers of (1) film-forming polyamide resin, (2) a blend of about 90 weight percent of at least one ethylene vinyl alcohol copolymer and about 10 weight percent of a plasticizer therefor, and said plasticizer being an aromatic sulfonamide selected from the class consisting of o, p-toluene sulfonamide, N-ethyl-o, p-toluene sulfonamide and ethylbenzene sulfonamide and (3) film-forming polyamide resin, respectively, said film-forming polyamide resin having a molecular weight of about 20,000 to 30,000 and a melting point temperature of about 415 degrees to 440 degrees Fahrenheit, said EVOH copolymer having a molecular weight of about 15,000 to 30,000, a vinyl alcohol moiety content of about 60 to 75 percent thereof, and a melting point temperature of about 325 degrees to 375 degrees Fahrenheit, the thickness of said EVOH layer (2), at any point across the width of said film, deviating by no more than 50 percent from the mean thickness value of said layer, and at least about 60 percent of said layer having a thickness within about 20 percent of said mean value.
Claim 8
Dependent Claim
12 words
The film of claim 5 wherein said mean value is 0.4 mil.
Claim 9
Dependent Claim
23 words
The film of claim 5 wherein said film additionally includes, as successive layers on said layer (3), (4) adhesive and (5) ionomer resin.
References Cited (Backward Citations)
US3560325A
Cited
US3882259A
Cited
US4082854A
Cited
US4064296A
Cited
US4261473A
Cited
JPS5349050A
Cited
US4243074A
Cited
US4243724A
Cited
JPS5478749A
Cited
JPS5478750A
Cited
US4261482A
Cited
US4240993A
Cited
US4239826A
Cited
US4254169A
Cited
JPS5593449A
Cited
US4284671A
Cited
JPS5627347A
Cited
US4289830A
Cited
US4347332A
Cited
US4427825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |