US4786678A
Expired / Lapsed
US
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Method of producing films from polyethylene resin, an additive and a second polymeric resin
Assignee: Mobil Oil AS
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Filing: 1988-05-06
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Granted: 1988-11-22
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Expires: 2008-05-06
Abstract
Abstract There is disclosed a modified method of preparing a blown polyethylene film made from a blend of major proportion of a polyethylene resin, e.g., LLDPE, a minor proportion of a second polymeric resin, e.g., polystyrene, and at least one additive, e.g., a colorant. The additive or additives are mixed with the second polymeric resin and the resulting mixture is then blended with the polyethylene resin, thereby reducing the number of process steps. Also disclosed is a method of monitoring and/or controlling the second polymeric resin content in the film made with known proportions of a colorant and the second polymeric resin by measuring the light transmission of the film.
Inventors
- 👤 David V. Dobreski
- 👤 Jack J. Donaldson
- 👤 Bruce E. Nattinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:40
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08J2323/00; C08J2323/02; C08J2323/04; C08J2425/00; C08J2477/00; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L25/16
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
66 words
A method of preparing a blown polyethylene film from a major proportion of a polyethylene resin, a minor proportion of a second polymeric resin, which is a thermoplastic polymer of styrene, para-methylstyrene or a polyamide, and at least one additive comprising blending the polyethylene resin with a separately-prepared mixture (masterbatch) of the second polymeric resin and said at least one additive and extruding the resulting blend.
Claim 2
Independent Claim
66 words
A method of preparing a blown polyethylene film from a major proportion of a polyethylene resin, a minor proportion of a second polymeric resin, which is a thermoplastic polymer of styrene, para-methylstyrene or a polyamide, and at least one additive comprising blending the polyethylene resin with a separately-prepared mixture (masterbatch) of the second polymeric resin and said at least one additive and extruding the resulting blend.
Claim 3
Dependent Claim
16 words
A method of claim 1 wherein the polyethylene resin is a linear low density polyethylene resin.
Claim 4
Dependent Claim
27 words
A method of claim 2 wherein said at least one additive is selected from the group consisting of colorants, slip agents, antiblock agents, antioxidants and processing aids.
Claim 5
Dependent Claim
15 words
A method of claim 3 wherein the additive is a colorant or an antiblocking agent.
Claim 6
Dependent Claim
18 words
A method of claim 4 wherein the second polymeric resin is a thermoplastic polymer of styrene or para-methylstyrene.
Claim 7
Dependent Claim
20 words
A method of claim 5 wherein the film comprises at least about 0.1% by weight of the second polymeric resin.
Claim 8
Dependent Claim
21 words
A method of claim 6 wherein the film comprises about 0.1 to about 10% by weight of the second polymeric resin.
Claim 9
Dependent Claim
21 words
A method of claim 7 wherein the film comprises about 0.5 to about 5% by weight of the second polymeric resin.
Claim 10
Dependent Claim
19 words
A method of claim 8 wherein the film comprises at least about 80% by weight of the polyethylene resin.
Claim 11
Dependent Claim
20 words
A method of claim 9 wherein the film comprises about 90 to about 99.9% by weight of the polyethylene resin.
Claim 12
Dependent Claim
20 words
A method of claim 10 wherein the film comprises about 95 to about 99.5% by weight of the polyethylene resin.
Claim 13
Dependent Claim
23 words
A method of claim 11 wherein the second polymeric resin is a thermoplastic polymer of styrene containing polymerized styrene as its predominant constituent.
Claim 14
Dependent Claim
12 words
A method of claim 12 wherein the polymer of styrene is polystyrene.
Claim 15
Dependent Claim
23 words
A method of claim 11 wherein the second polymeric resin is a thermoplastic polymer of para-methylstyrene containing polymerized para-methylstyrene as its predominant constituent.
Claim 16
Dependent Claim
35 words
A method of claim 13 wherein the linear low density polyethylene resin is a copolymer of ethylene and at least one C 3 -C 10 alpha-olefin having a density of about 0.940 g/cc or less.
Claim 17
Dependent Claim
26 words
A method of claim 15 wherein the linear low density polyethylene resin is a copolymer of ethylene and at least one C 4 -C 8 alpha-olefin.
Claim 18
Dependent Claim
26 words
A method of claim 14 wherein the linear low density polyethylene resin is a copolymer of ethylene and at least one C 4 -C 8 alpha-olefin.
Claim 19
Dependent Claim
27 words
A method of claim 16 wherein the linear low density polyethylene resin is a copolymer of ethylene and another alpha-olefin which is 1-butene, 4-methyl-1-pentene, 1-hexene or 1-octene.
Claim 20
Dependent Claim
22 words
A method of claim 18 wherein the linear low density polyethylene resin has a density of about 0.9 to about 0.94 g/cc.
Claim 21
Dependent Claim
22 words
A method of claim 19 wherein the linear low density polyethylene resin has a density of about 0.91 to about 0.93 g/cc.
Claim 22
Dependent Claim
15 words
A method of claim 20 wherein the mixture comprises 50% by weight of the colorant.
Claim 23
Dependent Claim
12 words
A method of claim 21 wherein the colorant is TiO 2 .
Claim 24
Dependent Claim
15 words
A method of claim 20 wherein the mixture comprises 40% by weight of the colorant.
Claim 25
Dependent Claim
12 words
A method of claim 23 wherein the colorant is TiO 2 .
Claim 26
Dependent Claim
27 words
A method of claim 17 wherein the linear low density polyethylene resin is a copolymer of ethylene and another alpha-olefin which is 1-butene, 4-methyl-1-pentene, 1-hexene or 1-octene.
Claim 27
Dependent Claim
22 words
A method of claim 21 wherein the linear low density polyethylene resin has a density of about 0.9 to about 0.94 g/cc.
Claim 28
Dependent Claim
22 words
A method of claim 22 wherein the linear low density polyethylene resin has a density of about 0.91 to about 0.93 g/cc.
Claim 29
Dependent Claim
15 words
A method of claim 27 wherein the mixture comprises 50% by weight of the colorant.
Claim 30
Dependent Claim
12 words
A method of claim 28 wherein the colorant is TiO 2 .
Claim 31
Dependent Claim
15 words
A method of claim 27 wherein the mixture comprises 40% by weight of the colorant.
Claim 32
Dependent Claim
12 words
A method of claim 30 wherein the colorant is TiO 2 .
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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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |