US4430289A
Expired / Lapsed
US
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Process for reducing block and increasing slip of linear low density polyethylene copolymer extrusion-blown films
Assignee: Dow Chemical Co
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Filing: 1982-04-05
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Granted: 1984-02-07
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Expires: 2002-04-05
Abstract
Abstract Blown films of LLDPE having reduced block and increased slip are provided by incorporating into the polymer, before blowing into films, effective amounts of certain fatty acid amides and inorganic materials which provide fast bloom, thereby obtaining an expedient effect of the additives on the surface properties of the blown film.
Inventors
- 👤 Osborne K. McKinney
- 👤 David P. Flores
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:52
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; B; B29; B29C; B29C48/00; B29C48/022; C08K13/00; C08K13/02; C08K5/00; C08K5/16; C08K5/20; B29C48/03; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
161 words
A process for reducing block, and increasing slip of blown films of linear low density ethylene copolymers which inherently exhibit high block and low slip, said process comprising incorporating into the said copolymer, prior to blowing into films, an effective fast-blooming amount in the range of about 0.05 to about 1.5 weight percent of at least one secondary fatty acid amide having a saturated alkyl group and an unsaturated alkyl group, and about 0.01 to about 2 weight percent of finely-divided inorganic, and extrusion blowing a melt of the mixture into a thin film wherein the linear low density ethylene copolymer comprises ethylene copolymerized with a sufficient amount of at least one alpha, beta-ethylenically unsaturated alkene having from 3 to 12 carbon atoms, to provide a copolymer having a density in the range of about 0.90 to about 0.94 gms./cc, said copolymers having a melt index in the range of about 0.1 to about 30 gm./10 min. as measured by ASTM-D-1238-(E).
Claim 2
Dependent Claim
161 words
A process for reducing block, and increasing slip of blown films of linear low density ethylene copolymers which inherently exhibit high block and low slip, said process comprising incorporating into the said copolymer, prior to blowing into films, an effective fast-blooming amount in the range of about 0.05 to about 1.5 weight percent of at least one secondary fatty acid amide having a saturated alkyl group and an unsaturated alkyl group, and about 0.01 to about 2 weight percent of finely-divided inorganic, and extrusion blowing a melt of the mixture into a thin film wherein the linear low density ethylene copolymer comprises ethylene copolymerized with a sufficient amount of at least one alpha, beta-ethylenically unsaturated alkene having from 3 to 12 carbon atoms, to provide a copolymer having a density in the range of about 0.90 to about 0.94 gms./cc, said copolymers having a melt index in the range of about 0.1 to about 30 gm./10 min. as measured by ASTM-D-1238-(E).
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein the alkene is at least one selected from the group consisting of propylene, butene, isobutene, pentene, isopentene, hexene, isohexene, heptene, isoheptene, octene, isooctene, nonene, isononene, decene, and isodecene.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the alkene is at least one of octene, heptene, hexene, pentene, butene, and propylene.
Claim 5
Dependent Claim
46 words
The process of claim 1 wherein the secondary fatty acid amide conforms essentially to the empirical formula R--CO--NH--R', where R and R' each, independently, are alkyl groups having 10 to 26 carbon atoms wherein one of the alkyl groups is saturated and the other is unsaturated.
Claim 6
Dependent Claim
56 words
The process of claim 1 wherein the finely-divided inorganic material comprises silica and/or diatomaceous earth having a surface area of about 0.7 to about 100 m 2 /gm., an oil absorption value of about 21 to about 175 parts oil per 100 parts inorganic, and an average particle size of about 0.02 to about 40 microns.
Claim 7
Dependent Claim
62 words
The process of claim 1 wherein the secondary fatty acid amide conforms essentially to the empirical formula R--CO--NH--R', where R and R' represent, independently, alkyl moieties selected from the group of fatty acids comprising erucyl, linoleyl, linolenyl, arachidonyl, palmitoleyl, elaidyl, vaccenyl, behenyl, arachidyl, stearyl, palmityl, lignoceryl, and oleyl, and where one of the alkyl moieties is saturated and the other is unsaturated.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein the secondary fatty acid amide is at least one of stearyl erucylamide, oleyl palmitamide, and oleyl erucylamide.
Claim 9
Dependent Claim
36 words
The process of claim 1 wherein the inorganic material comprises at least one of the group comprising talc, limestone, silica, aluminum silicate, diatomaceous earth, magnesium silicate, clay, magnesium sulfate, alumina trihydrate, magnesium oxide, and zinc oxide.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein the finely-divided inorganic comprises talc.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein the finely-divided inorganic comprises limestone.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein the finely-divided inorganic comprises siliceous material.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein the finely-divided inorganic comprises silica.
Claim 14
Dependent Claim
57 words
The process of claim 1 wherein the incorporating of the amide and the inorganic into the said copolymer comprises the use of a masterbatch of an ethylene polymer with amide and inorganic mixed therein and the blending of said masterbatch with said copolymer to attain the desired amount of amide and inorganic in the film produced therefrom.
Claim 15
Dependent Claim
20 words
The process of claim 1 wherein the ratio of amide/inorganic is in the range of about 0.5 to about 5.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |