Patent US6503637B1 successfully refreshed from Google Patents.
US6503637B1
Expired / Lapsed
US
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Heat sealable films
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1998-02-24
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Granted: 2003-01-07
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Expires: 2018-02-24
Abstract
Abstract A film comprising a blend of: i) a homopolymer of ethylene having a Mw/Mn of 3 or a copolymer of ethylene and up to 50% weight % of a C 3 to C 20 olefm, the copolymer having a CBDI of 50% or more; ii) a homopolymer of propylene or a copolymer of propylene and up to 50 weight % of a comonomer selected from the group consisting of ethylene and C 4 to C 20 alpha-olefms; and iii) a polymer produced in a high pressure process using a free radical initiator.
Inventors
- 👤 Achiel Jos Van Loon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:48
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; C; C08; C08L; C08L23/00; C08L23/02; C08L23/16; B32B27/06; B32B27/08; B32B27/322; B32B27/327; C08J; C08J5/00; C08J5/18; C08K; C08K5/00; C08K5/16; C08K5/20; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; B32B2270/00; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2553/00; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08J2323/10; C08L2205/00; C08L2205/02; C08L23/10; C08L2314/00; C08L2314/06; C08L2555/00; C08L2555/40; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31938
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
93 words
A film comprising a blend comprising: i) a homopolymer of ethylene having an Mw/Mn of 3 or less or a copolymer of ethylene and up to 50 weight % of a C 3 to C 20 olefin, the copolymer having a CDBI of 50% or more; ii) a homopolymer of propylene or copolymer of propylene and up to 50 weight % of a comonomer selected from the group consisting of ethylene and C 4 to C 20 alpha-olefins; and iii) a polymer produced in a high pressure process using a free radical initiator.
Claim 2
Dependent Claim
93 words
A film comprising a blend comprising: i) a homopolymer of ethylene having an Mw/Mn of 3 or less or a copolymer of ethylene and up to 50 weight % of a C 3 to C 20 olefin, the copolymer having a CDBI of 50% or more; ii) a homopolymer of propylene or copolymer of propylene and up to 50 weight % of a comonomer selected from the group consisting of ethylene and C 4 to C 20 alpha-olefins; and iii) a polymer produced in a high pressure process using a free radical initiator.
Claim 3
Dependent Claim
22 words
The film of claim 1 , wherein the copolymer of ethylene is a copolymer of ethylene and propylene, butene, hexene or octene.
Claim 4
Dependent Claim
35 words
The film of claim 2 wherein the copolymer of ethylene has a CDBI of 65 to 85%, a density of 0.915 g/cm 3 to 0.96 g/cm 3 and an Mw/Mn of from 1 to 2.5.
Claim 5
Dependent Claim
29 words
The film of claim 2 wherein the copolymer of ethylene has a CDBI of 80 to 99% and a density of 0.88 g/cm 3 to 0.925 g/cm 3 .
Claim 6
Dependent Claim
16 words
The film of claim 1 , wherein the film has a haze of 5% or less.
Claim 7
Dependent Claim
28 words
The film of claim 1 , wherein the polymer produced in a high pressure process using a free radical initiator is low density polyethylene or ethylene vinyl acetate.
Claim 8
Dependent Claim
43 words
The film of claim 1 , wherein the polyethylene component comprises a blend of the homopolymer of ethylene or the copolymer of ethylene and another polyolefin, and the polypropylene component comprises a blend of the homopolymer or copolymer of propylene and another polyolefin.
Claim 9
Dependent Claim
35 words
The film of claim 1 characterised in that when formed into a 50 μm thick film has an average secant modulus greater than 350 MPa and a dart drop impact strength greater than 5 g/μm.
Claim 10
Dependent Claim
15 words
The film of claim 1 , wherein the film is sealed to a second layer.
Claim 11
Dependent Claim
15 words
A multi layer film wherein a non-surface layer comprises the film of claim 1 .
Claim 12
Dependent Claim
17 words
A multi layer film wherein at least one surface layer comprises the film of claim 1 .
Claim 13
Dependent Claim
12 words
The film of claim 1 , wherein the film has been oriented.
Claim 14
Dependent Claim
11 words
The film of claim 1 , wherein the film is co-extruded.
Claim 15
Dependent Claim
65 words
The film of claim 1 , wherein the film is cast, blown or co-extruded and the polyethylene is present at 50 to 80 weight %, the polypropylene is present at 10 to 45 weight % and polymer produced in high pressure process using a free radical initiator is LDPE and is present at 2 to 10 weight %, based upon the weight of the blend.
Claim 16
Dependent Claim
14 words
The film of claim 1 , wherein the film is laminated to a substrate.
Claim 17
Dependent Claim
18 words
The film of claim 15 , wherein the substrate is polypropylene, polyarnide, polyester, polyethylene, or a metallized substrate.
Claim 18
Independent Claim
108 words
A method to produce a film having good haze values comprising: i) selecting a first polymer having a CDBI of 50% or more comprising homopolyethylene or a copolymer of ethylene and up to 50 weight % of a C 3 to C 20 olefin,; ii) selecting a second polymer comprising homopolypropylene or a copolymer of propylene and up to 50 weight % of ethylene or a C 4 to C 20 olefin; iii) selecting a third polymer comprising one or more polymers produced in a high pressure process using a free radical initiator; and iv) combining the first, second and third polymers and forming them into a film.
Claim 19
Independent Claim
108 words
A method to produce a film having good haze values comprising: i) selecting a first polymer having a CDBI of 50% or more comprising homopolyethylene or a copolymer of ethylene and up to 50 weight % of a C 3 to C 20 olefin,; ii) selecting a second polymer comprising homopolypropylene or a copolymer of propylene and up to 50 weight % of ethylene or a C 4 to C 20 olefin; iii) selecting a third polymer comprising one or more polymers produced in a high pressure process using a free radical initiator; and iv) combining the first, second and third polymers and forming them into a film.
Claim 20
Independent Claim
108 words
A method to produce a film, the method comprising: i) selecting a first polymer having a CDBI of 50% or more comprising homopolyethylene or a copolymer of ethylene and up to 50 weight % of a C 3 to C 20 olefin; ii) selecting a second polymer comprising homopolypropylene or a copolymer of propylene and up to 50 weight % of ethylene or a C 4 to C 20 olefin; iii) selecting a third polymer comprising a high pressure polymer producing a process using a free radical initiator; iv) combining the first polymer, second polymer and third polymer to form all or part of a film surface layer.
Claim 21
Independent Claim
108 words
A method to produce a film, the method comprising: i) selecting a first polymer having a CDBI of 50% or more comprising homopolyethylene or a copolymer of ethylene and up to 50 weight % of a C 3 to C 20 olefin; ii) selecting a second polymer comprising homopolypropylene or a copolymer of propylene and up to 50 weight % of ethylene or a C 4 to C 20 olefin; iii) selecting a third polymer comprising a high pressure polymer producing a process using a free radical initiator; iv) combining the first polymer, second polymer and third polymer to form all or part of a film surface layer.
Claim 22
Dependent Claim
47 words
A method of packaging an article using the film of claim 1 , the method comprising enclosing the article in the film and heat sealing the film such that at least one seal is formed by heat sealing a first surface layer to a second surface layer.
Claim 23
Dependent Claim
111 words
A film having a thickness of from 10 to 120 μm, and a haze of 16% or less, as determined by ASTM 1003, condition A, comprising a blend having: a) from 10-90 weight % of a copolymer of ethylene and up to 50 weight % of a C 3 -C 20 olefin, said copolymer having a density of from 0.915 g/cm 3 to 0.935 g/cm 3 ; b) from 10-90 weight % of a homopolymer of propylene or a copolymer of propylene and up to 50 weight % of a comonomer; and c) from 1-30 weight % of a polymer produced in a high pressure process using a free radical initiator.
Claim 24
Dependent Claim
111 words
A film having a thickness of from 10 to 120 μm, and a haze of 16% or less, as determined by ASTM 1003, condition A, comprising a blend having: a) from 10-90 weight % of a copolymer of ethylene and up to 50 weight % of a C 3 -C 20 olefin, said copolymer having a density of from 0.915 g/cm 3 to 0.935 g/cm 3 ; b) from 10-90 weight % of a homopolymer of propylene or a copolymer of propylene and up to 50 weight % of a comonomer; and c) from 1-30 weight % of a polymer produced in a high pressure process using a free radical initiator.
Claim 25
Dependent Claim
129 words
The film of claim 20 , wherein: a) said copolymer of ethylene is present in said blend from 20 to 80 weight %, said copolymer of ethylene has a M w /M n of 3 or less and a CDBI of 50% or more, wherein said C 3 -C 20 olefin is propylene, butene, hexene, or octene; b) said copolymer or homopolymer of propylene is present in said blend from 20-80 weight %, wherein said copolymer of propylene is a copolymer of a C 4 -C 20 olefin, where said olefin is present in said copolymer from 1-35 weight %; and c) said high pressure produced polymer is present in said blend from 2-30 weight %, and has a density from 0.910 g/cm 3 to 0.940 g/cm 3 .
Claim 26
Dependent Claim
126 words
The film of claim 20 wherein said blend has a) from 30-70 weight % of said copolymer of ethylene, wherein said copolymer of ethylene has a Mw/Mn from 1 to 2.5, a CDBI from 60%-85%, wherein said copolymer has C 3 -C 20 olefin content of 1-35 weight %, wherein said olefin is propylene, butene, hexene, or octene; b) from 30-70 weight % of said homopolymer or copolymer of propylene, wherein said comonomer is present in said copolymer from 1-6 weight %, and wherein said comonomer is ethylene or a C 4 -C 20 olefin; and c) from 5-20 weight % of said polymer produced in a high pressure process, wherein said polymer has a density of from 0.915 g/cm 3 to 0.935 g/cm 3 .
Claim 27
Dependent Claim
39 words
The film of claim 20 , wherein the copolymer of propylene has a CDBI of 70% or more and an MFR as determined by ASTM 1238, of 1-20 dg/min, and wherein said blend has a haze 14% or less.
Claim 28
Dependent Claim
28 words
The film of claim 20 , wherein the film has an average Secant modulus greater than 350 MPa and a dart drop impact strength greater than 5 g/μm.
Claim 29
Dependent Claim
55 words
A multi layer film comprising an ABC structure, wherein the A layer is a metallocene catalyst produced polyethylene or a blend with a metallocene catalyzed polyethylene; the B layer is the film of claim 20 , and the C layer is a sealing layer including a random copolymer of propylene and 3-6 weight % ethylene.
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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) | 2006-01-06 | 2006-07-08 | 2007-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-01-06 | 2010-07-08 | 2011-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-01-06 | 2014-07-08 | 2015-01-07 | $7700.00 | Window Closed / Lapsed |