Patent US5287536A successfully refreshed from Google Patents.
US4550141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of ionomer with propylene copolymer
Assignee: EIDP Inc
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Filing: 1983-08-22
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Granted: 1985-10-29
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Expires: 2003-08-22
Abstract
Abstract Blends of (a) 80-93 weight percent of an ethylene/acid ionomer, and (b) 7-20 weight percent of a propylene/α-olefin copolymer are used to prepare peelable seals having nearly constant and predictable peel strength over an extended heat seal temperature range. Some of the seals so produced also show stress whitening.
Inventors
- 👤 George L. Hoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:48
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/06; B32B27/08; B32B27/308; B32B27/32; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L23/0876; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0846; C09J123/0869; C09J123/0876; B32B2270/00; B32B2307/00; B32B2307/70; B32B2307/718; B32B2553/00; C08L2205/00; C08L2205/03; C08L23/10; C08L23/12; C08L2666/00; C08L2666/02; C08L2666/04; C08L2666/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
53 words
A molecular blend of polymeric materials for producing film characterized by a nearly constant peel strength over an extended heat seal temperature range, said materials comprising: (a) 80-93 weight percent of an ethylene/acid ionomer, and (b) 7-20 weight percent of a propylene/α-olefin copolymer, wherein the α-olefin comprises 1-12 weight percent of the copolymer.
Claim 2
Dependent Claim
53 words
A molecular blend of polymeric materials for producing film characterized by a nearly constant peel strength over an extended heat seal temperature range, said materials comprising: (a) 80-93 weight percent of an ethylene/acid ionomer, and (b) 7-20 weight percent of a propylene/α-olefin copolymer, wherein the α-olefin comprises 1-12 weight percent of the copolymer.
Claim 3
Dependent Claim
12 words
The blend of claim 1 wherein the ethylene/acid ionomer is a dipolymer.
Claim 4
Dependent Claim
12 words
The blend of claim 1 wherein the ethylene/acid ionomer is a terpolymer.
Claim 5
Dependent Claim
23 words
The blend of claim 3 wherein the ethylene/acid ionomer contains at least 50 weight percent ethylene and more than 12 weight percent acid.
Claim 6
Dependent Claim
15 words
The blend of claim 1 wherein the acid in the ethylene/acid ionomer is methacrylic acid.
Claim 7
Dependent Claim
17 words
The blend of claim 1 wherein the acid in the ethylene/acid ionomer is partially neutralized with zinc.
Claim 8
Dependent Claim
21 words
The blend of claim 1 wherein the degree of neutralization of the acid in the ethylene/acid ionomer is 5 to 45%.
Claim 9
Dependent Claim
22 words
The blend of claim 2 wherein the acid in the ionomer comprises greater than 12 but not more than 25 weight percent.
Claim 10
Dependent Claim
24 words
The blend of claim 3 wherein the ionomer contains units derived from isobutyl acrylate in addition to those derived from ethylene and the acid.
Claim 11
Dependent Claim
22 words
The blend of claim 9 wherein the units derived from isobutyl acrylate comprise from 5 to 25 weight percent of the ionomer.
Claim 12
Dependent Claim
12 words
The blend of claim 1 wherein the propylene/α-olefin copolymer is a dipolymer.
Claim 13
Dependent Claim
10 words
The blend of claim 11 wherein the α-olefin is ethylene.
Claim 14
Dependent Claim
18 words
The blend of claim 1 wherein the α-olefin is ethylene and comprises 2-8 weight percent of the copolymer.
Claim 15
Dependent Claim
8 words
Films made from the blends of claim 1.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |