Patent US4725505A successfully refreshed from Google Patents.
US4725505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polybutylene blend for form and fill film packaging
Assignee: Mitsui Chemicals Inc
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Filing: 1986-09-12
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Granted: 1988-02-16
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Expires: 2006-09-12
Abstract
Abstract A polymer blend with good hot tack and a low and broad heat seal initiation temperature range for vertical and horizontal form and fill film packaging which contains a copolymer of butene-1 and propylene and a copolymer of propylene and ethylene.
Inventors
- 👤 Charles C. Hwo
- 👤 Masaki Kohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:13
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; C08L23/16; C08L23/18; C08L23/20; C09; C09J; C09J123/00; C09J123/02; C09J123/16; C09J123/18; C09J123/20; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/10; B32B2553/00; C08L23/12; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A polymer film aged at elevated temperatures of at least about 55° C. for one to fourteen days having good hot tack and a low and broad heat seal temperature range for vertical form and fill film packaging, comprising: a propylene or polypropylene-based copolymer or blend as a substrate or core layer; and a polymer blend as a surface layer, wherein said polymer blend comprises a butene-1-propylene copolymer having a propylene content of from about 12% by weight to about 30% by weight, a propylene-ethylene copolymer having an ethylene content of from about 2.5% by weight to about 10% by weight, and where said butene-1-propylene copolymer and said propylene-ethylene copolymer are combined in a weight proportion of from about 40:60 to about 75:25 and wherein said polymer film has an acceptable hot tack range of from about 200° F. to about 290° F., and a heat seal temperature range of from about 170° F. to about 290° F.
Claim 2
Dependent Claim
158 words
A polymer film aged at elevated temperatures of at least about 55° C. for one to fourteen days having good hot tack and a low and broad heat seal temperature range for vertical form and fill film packaging, comprising: a propylene or polypropylene-based copolymer or blend as a substrate or core layer; and a polymer blend as a surface layer, wherein said polymer blend comprises a butene-1-propylene copolymer having a propylene content of from about 12% by weight to about 30% by weight, a propylene-ethylene copolymer having an ethylene content of from about 2.5% by weight to about 10% by weight, and where said butene-1-propylene copolymer and said propylene-ethylene copolymer are combined in a weight proportion of from about 40:60 to about 75:25 and wherein said polymer film has an acceptable hot tack range of from about 200° F. to about 290° F., and a heat seal temperature range of from about 170° F. to about 290° F.
Claim 3
Dependent Claim
156 words
A polymer film aged at elevated temperatures of at least about 55° C. for one to fourteen days having good hot tack and a low and broad heat seal temperature range for vertical form and fill film packaging, comprising: a propylene or polypropylene-based compolymer or blend as a substrate or core layer; and a polymer blend as a surface layer, wherein said polymer blend comprises a butene-1-propylene copolymer having a propylene content from about 15% by weight to about 25% by weight, a propylene-ethylene copolymer having an ethylene content from about 5% by weight to about 7% by weight and wherein said butene-1-propylene copolymer and said propylene-ethylene copolymer are combined in a weight proportion of from about 60:40 to about 70:30 and wherein said polymer film has an acceptable hot tack range of from about 200° F. to about 290° F., and a heat seal temperature range of from about 170° F. to about 290° F.
Claim 4
Dependent Claim
156 words
A polymer film aged at elevated temperatures of at least about 55° C. for one to fourteen days having good hot tack and a low and broad heat seal temperature range for vertical form and fill film packaging, comprising: a propylene or polypropylene-based compolymer or blend as a substrate or core layer; and a polymer blend as a surface layer, wherein said polymer blend comprises a butene-1-propylene copolymer having a propylene content from about 15% by weight to about 25% by weight, a propylene-ethylene copolymer having an ethylene content from about 5% by weight to about 7% by weight and wherein said butene-1-propylene copolymer and said propylene-ethylene copolymer are combined in a weight proportion of from about 60:40 to about 70:30 and wherein said polymer film has an acceptable hot tack range of from about 200° F. to about 290° F., and a heat seal temperature range of from about 170° F. to about 290° F.
Claim 5
Dependent Claim
139 words
A polymer film aged at elevated temperatures of at least about 55° C. for one to fourteen days having good hot tack and a low and broad heat seal temperature range for vertical form and fill film packaging, comprising: a polypropylene or propylene-ethylene copolymer as a substrate or core layer; and a polymer blend as a surface layer, wherein said polymer blend comprises a butene-1-propylene copolymer having a propylene content of about 20% by weight, a propylene-ethylene copolymer having an ethylene content of about 6% by weight, and where said butene-1-propylene copolymer and said propylene-ethylene copolymer are combined in a weight proportion of about 65:35 and wherein said polymer film has an acceptable hot tack range of from about 200° F. to about 290° F., and a heat seal temperature of from about 170° F. to about 290° F.
Claim 6
Dependent Claim
139 words
A polymer film aged at elevated temperatures of at least about 55° C. for one to fourteen days having good hot tack and a low and broad heat seal temperature range for vertical form and fill film packaging, comprising: a polypropylene or propylene-ethylene copolymer as a substrate or core layer; and a polymer blend as a surface layer, wherein said polymer blend comprises a butene-1-propylene copolymer having a propylene content of about 20% by weight, a propylene-ethylene copolymer having an ethylene content of about 6% by weight, and where said butene-1-propylene copolymer and said propylene-ethylene copolymer are combined in a weight proportion of about 65:35 and wherein said polymer film has an acceptable hot tack range of from about 200° F. to about 290° F., and a heat seal temperature of from about 170° F. to about 290° F.
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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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |