US4614764A
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US
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Linear low density ethylene polymers blended with modified linear low density ethylene polymers
Assignee: Mobil Oil AS
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Filing: 1985-03-06
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Granted: 1986-09-30
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Expires: 2005-03-06
Abstract
Abstract The properties of linear ethylene polymers, especially linear, low density polyethylene (LLDPE), are improved by adding a chemically modified ethylene polymer to the base resin. The modification is brought about by the use of a free radical generator, preferably an organic peroxy compound such as benzoyl peroxide, optionally with an unsaturated silane such as vinyl trimethoxy silane. The use of the modified resin masterbatch enhances the crystallization of the polymer and improves the melt strength of the polymer, providing greater bubble stability in the blown tubular film extrusion process so that higher operating speeds may be employed. In addition, the films produced from the blends have improved antiblocking properties without significant deterioration of mechanical properties.
Inventors
- 👤 Edward A. Colombo
- 👤 Tae H. Kwack
- 👤 Tien-Kuei Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08J2323/00; C08J2323/02; C08J2323/16; C08L51/00; C08L51/06
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
50 words
A blown plastic resin film of improved properties made from a blend of a linear, low density ethylene polymer and 5 to 30 weight percent of the blend of a linear, low density ethylene polymer which has been modified by reaction in the molten state with a free radical generator.
Claim 2
Dependent Claim
50 words
A blown plastic resin film of improved properties made from a blend of a linear, low density ethylene polymer and 5 to 30 weight percent of the blend of a linear, low density ethylene polymer which has been modified by reaction in the molten state with a free radical generator.
Claim 3
Dependent Claim
17 words
A film according to claim 1 in which the free radical generator comprises an organic peroxy compound.
Claim 4
Dependent Claim
20 words
A film according to claim 2 in which the peroxy compound comprises t-butyl peroxy pivalate, t-butyl hydroperoxide or dicumyl peroxide.
Claim 5
Dependent Claim
29 words
A film according to claim 1 in which the modified polymer is modified by reaction with an unsaturated organic silane compound in the presence of the free radical generator.
Claim 6
Dependent Claim
16 words
A film according to claim 4 in which the silane compound vinyl trimethoxysilane or vinyl triethoxysilane.
Claim 7
Dependent Claim
25 words
A film according to claim 1 in which the amount of free radical generator is from 0.01 to 5 weight percent of the modified polymer.
Claim 8
Dependent Claim
25 words
A film according to claim 4 in which the amount of unsaturated silane compound is from 0.01 to 5 weight percent of the modified polymer.
Claim 9
Dependent Claim
13 words
A film according to claim 1 produced by the tubular film blowing process.
Claim 10
Dependent Claim
106 words
A blown plastic resin film according to claim 1 of improved mechanical and antiblocking properties made from a blend of (i) a linear ethylene polymer having a density of less than 0.940 g.cc. -1 and (ii) 5 to 30 weight percent of the blend of a linear ethylene polymer having a density of less than 0.940 g.cc. -1 modified by treatment at an elevated temperature with 0.01 to 5 weight percent, based on the weight of the modified polymer, of an organic, peroxy free radical generator and from 0.01 to 5 weight percent, based on the weight of the modified polymer, of an unsaturated silane compound.
Claim 11
Independent Claim
52 words
A method of increasing the melt strength of a linear, low density ethylene polymer which comprises blending the polymer with a linear, low-density ethylene polymer which has been modified by reaction in the molten state with a free radical generator, said modified polymer comprising 5 to 30 weight percent of the blend.
Claim 12
Independent Claim
52 words
A method of increasing the melt strength of a linear, low density ethylene polymer which comprises blending the polymer with a linear, low-density ethylene polymer which has been modified by reaction in the molten state with a free radical generator, said modified polymer comprising 5 to 30 weight percent of the blend.
Claim 13
Dependent Claim
17 words
A method according to claim 10 in which the free radical generator comprises an organic peroxy compound.
Claim 14
Dependent Claim
20 words
A method according to claim 11 in which the peroxy compound comprises t-butyl peroxy pivalate, t-butyl hydroperoxide or dicumyl peroxide.
Claim 15
Dependent Claim
29 words
A method according to claim 10 in which the modified polymer is modified by reaction with an unsaturated organic silane compound in the presence of the free radical generator.
Claim 16
Dependent Claim
16 words
A method according to claim 13 in which the silane compound vinyl trimethoxysilane or vinyl triethoxysilane.
Claim 17
Dependent Claim
25 words
A method according to claim 10 in which the amount of free radical generator is from 0.01 to 5 weight percent of the modified polymer.
Claim 18
Dependent Claim
25 words
A method according to claim 13 in which the amount of unsaturated silane compound is from 0.01 to 5 weight percent of the modified polymer.
Claim 19
Dependent Claim
99 words
A method according to claim 10 in which the blend is formed from (i) a linear ethylene polymer having a density of less than 0.940 g.cc. -1 and (ii) 5 to 30 weight percent of the blend of a linear ethylene polymer having a density of less than 0.940 g.cc. -1 modified by treatment at an elevated temperature with 0.01 to 5 weight percent, based on the weight of the modified polymer, of an organic, peroxy free radical generator and from 0.01 to 5 weight percent, based on the weight of the modified polymer, of an unsaturated silane oompound.
Claim 20
Independent Claim
56 words
A method of improving the antiblocking properties of a film made from a linear, low density ethylene polymer, which comprises blending with the polymer from which the film is formed, a linear, low density ethylene polymer modified by reaction with a free radical generator, said modified polymer comprising 5 to 30 weight percent of the blend.
Claim 21
Independent Claim
56 words
A method of improving the antiblocking properties of a film made from a linear, low density ethylene polymer, which comprises blending with the polymer from which the film is formed, a linear, low density ethylene polymer modified by reaction with a free radical generator, said modified polymer comprising 5 to 30 weight percent of the blend.
Claim 22
Dependent Claim
17 words
A method according to claim 18 in which the free radical generator comprises an organic peroxy compound.
Claim 23
Dependent Claim
20 words
A method according to claim 19 in which the peroxy compound comprises t-butyl peroxy pivalate, t-butyl hydroperoxide or dicumyl peroxide.
Claim 24
Dependent Claim
29 words
A method according to claim 18 in which the modified polymer is modified by reaction with an unsaturated organic silane compound in the presence of the free radical generator.
Claim 25
Dependent Claim
16 words
A method according to claim 21 in which the silane compound vinyl trimethoxysilane or vinyl triethoxysilane.
Claim 26
Dependent Claim
25 words
A method according to claim 18 in which the amount of free radical generator is from 0.01 to 5 weight percent of the modified polymer.
Claim 27
Dependent Claim
25 words
A method according to claim 21 in which the amount of unsaturated silane compound is from 0.01 to 5 weight percent of the modified polymer.
Claim 28
Dependent Claim
21 words
A method according to claim 18 in which the film is a blown film produced by the tubular film blowing process.
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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) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |