US4082877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unoriented composite laminar film with an elastomeric layer and sealable layer
Assignee: WR Grace and Co
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Filing: 1975-02-14
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Granted: 1978-04-04
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Expires: 1995-02-14
Abstract
Abstract Disclosed is an extensible composite laminar film useful for packaging which includes a first layer of elastomeric polymeric composition and one or more extensible sealable layers of polymeric composition including an interpolymer of ethylene and alkenoic acid or ionomeric salt thereof. In an embodiment the film has a tensile secant modulus of from about 1,000 to about 30,000 and preferably from about 1,000 to about 14,950 pounds per square inch. The film is prepared advantageously by hot blown coextrusion. When stretch wrapped about a variety of products the film typically exhibits a high degree of elastic recovery. Also disclosed is an elastomeric film-forming composition including an ethylene-vinyl acetate interpolymer and an ethylene-propylene interpolymer desirably having a density of not more tha 0.92. The first layer of the film may effectively be prepared from the composition.
Inventors
- 👤 Robert James Shadle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B1/00; B32B1/08; B32B27/28; B32B27/32; B65; B65D; B65D65/00; B65D65/38; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/516; B32B2439/00; Y; Y10; Y10S; Y10S206/00; Y10S206/819; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
149 words
A substantially unoriented composite laminar film having a 10 percent tensile secant modulus of from about 1,000 to about 30,000 pounds per square inch which comprises: a first layer of elastomeric polymeric composition; and a sealable layer of a polymeric composition comprising an interpolymer of ethylene and alkenoic acid; and wherein, said elastomeric polymeric composition comprises a material selected from the group consisting of elastomeric interpolymer of ethylene with an alpha-mono-olefin having from 3 to about 8 carbon atoms per molecule, elastomeric interpolymers of styrene with a conjugated diene, elastomeric interpolymers of ethylene and a vinyl ester of carboxylic acid having from 2 to about 5 carbon atoms per molecule, elastomeric polyurethanes, elastomeric polyesters, elastomeric polyethers, and mixtures thereof; and wherein said alkenoic acid interpolymer is selected from ionomeric salts of interpolymers of ethylene and an alpha, beta-ethylenically unsaturated carboxylic acid having from 3 to about 10 carbon atoms.
Claim 2
Dependent Claim
149 words
A substantially unoriented composite laminar film having a 10 percent tensile secant modulus of from about 1,000 to about 30,000 pounds per square inch which comprises: a first layer of elastomeric polymeric composition; and a sealable layer of a polymeric composition comprising an interpolymer of ethylene and alkenoic acid; and wherein, said elastomeric polymeric composition comprises a material selected from the group consisting of elastomeric interpolymer of ethylene with an alpha-mono-olefin having from 3 to about 8 carbon atoms per molecule, elastomeric interpolymers of styrene with a conjugated diene, elastomeric interpolymers of ethylene and a vinyl ester of carboxylic acid having from 2 to about 5 carbon atoms per molecule, elastomeric polyurethanes, elastomeric polyesters, elastomeric polyethers, and mixtures thereof; and wherein said alkenoic acid interpolymer is selected from ionomeric salts of interpolymers of ethylene and an alpha, beta-ethylenically unsaturated carboxylic acid having from 3 to about 10 carbon atoms.
Claim 3
Dependent Claim
32 words
The film of claim 1 further including a second sealable layer of a polymeric composition comprising an interpolymer of ethylene and alkenoic acid with said first layer disposed intermediate the sealable layers.
Claim 4
Dependent Claim
26 words
The film of claim 1 wherein the film has a ten percent tensile secant modulus of from about 1,000 to about 14,950 pounds per square inch.
Claim 5
Dependent Claim
26 words
The film of claim 1 wherein the film has a ten percent tensile secant modulus of from about 1,000 to about 14,950 pounds per square inch.
Claim 6
Dependent Claim
41 words
The film of claim 2 wherein both of the sealable layer are comprised of a polymeric composition comprising an ionomeric inorganic salt of an interpolymer of ethylene and an ethylenically unsaturated carboxylic acid having from 3 to about 10 carbon atoms.
Claim 7
Dependent Claim
12 words
The film of claim 5 wherein the carboxylic acid is methacrylic acid.
Claim 8
Dependent Claim
12 words
The film of claim 6 wherein the salt is a sodium salt.
Claim 9
Dependent Claim
12 words
The film of claim 6 wherein the salt is a zinc salt.
Claim 10
Dependent Claim
22 words
The film of claim 8 having less than 35 percent of the carboxy (HOOC--) groups in the methacrylic acid neutralized with zinc.
Claim 11
Dependent Claim
102 words
The film of claim 8 wherein from about 10 to about 45 percent of the carboxy (HOOC--) groups in the methacrylic acid are neutralized with zinc, the melt index of the ionomeric salt interpolymer is from about 1 to about 20 grams per 10 minutes, and the total weight of the carboxy groups and the neutralized carboxy groups is from about 5 to about 20 parts by weight expressed as methacrylic acid units per 100 parts by total weight of the ionomeric interpolymer moiety consisting of ethylene units, methacrylic acid units, and neutralized methacrylic acid units expressed as units of methacrylic acid.
Claim 12
Dependent Claim
73 words
The film of claim 1 wherein the elastomeric polymeric composition comprises an elastomeric blend of (I) an elastomeric interpolymer of ethylene and propylene with (II) a polymer selected from the group consisting of (A) low density polyethylene having a density of from about 0.91 to about 0.925 gram per cubic centimeter and (B) interpolymers of ethylene and vinyl acetate including from about 2 to about 30 percent by weight of vinyl acetate units.
Claim 13
Dependent Claim
109 words
The film of claim 11 wherein the blend comprises (I) from about 1 part to about 99 parts by weight of an elastomeric interpolymer of ethylene in an amount from about 20 to about 77.5 percent by weight of ethylene units and propylene in an amount from about 80 to about 22.5 percent by weight of propylene units and (II) from about 99 parts to about 1 part by weight of an interpolymer of ethylene in an amount from about 98 to about 70 percent by weight of ethylene units and vinyl acetate in an amount from about 2 to about 30 percent by weight of vinyl acetate units.
Claim 14
Dependent Claim
87 words
The film of claim 11 wherein the blend comprises (I) from 1 part to about 99 parts by weight of an elastomeric interpolymer of ethylene in an amount from about 20 to about 77.5 percent by weight of ethylene units and propylene in an amount from about 80 to about 22.5 percent by weight of propylene units and (II) from about 99 parts to about 1 part by weight of low density polyethylene having a density of from about 0.91 to about 0.925 gram per cubic centimeter.
Claim 15
Dependent Claim
33 words
The film of claim 1 wherein the elastomeric polymeric composition comprises an elastomeric interpolymer of ethylene and vinyl acetate including from about 1 to about 40 percent by weight of vinyl acetate units.
Claim 16
Dependent Claim
18 words
The film of claim 1 wherein the elastomeric polymeric composition comprises an elastomeric interpolymer of styrene and butadiene.
Claim 17
Dependent Claim
18 words
The film of claim 1 wherein the elastomeric polymeric composition comprises an elastomeric interpolymer of ethylene and propylene.
Claim 18
Dependent Claim
13 words
The film of claim 1 having ultimate extensibility of at least 100 percent.
Claim 19
Dependent Claim
16 words
The film of claim 1 having ultimate extensibility of from about 175 to about 485 percent.
Claim 20
Dependent Claim
16 words
The film of claim 1 having tensile strength of from about 3,000 to about 5,000 p.s.i.
Claim 21
Dependent Claim
13 words
The film of claim 1 having shrink energy of less than 50 p.s.i.
Claim 22
Dependent Claim
37 words
The film of claim 2 wherein the outer surface of at least one of said sealable layers has a static coefficients of friction to metal, polyamide and polyester in the range from about 0.3 to about 0.6.
Claim 23
Dependent Claim
53 words
The film of claim 2 wherein the total thickness of the film is from about 0.5 ml to about 3 mils and the ratio of thickness in mil units of said first layer to the thickness in mil units of each of said sealable outer layers is from about 1:2 to about 20:1.
Claim 24
Dependent Claim
118 words
The film of claim 5 wherein said elastomeric polymeric composition in said first layer is a blend comprising (I) from about 1 part to about 99 parts by weight of an elastomeric interpolymer of ethylene in an amount from about 20 to about 77.5 percent by weight of ethylene units and propylene in an amount from about 80 to about 22.5 percent by weight of propylene units and (II) from about 99 parts to about 1 part by weight of an interpolymer of ethylene in an amount from about 99 to about 70 percent by weight of ethylene units and vinyl acetate in an amount from about 2 to about 30 percent by weight of vinyl acetate units.
Claim 25
Dependent Claim
66 words
The film of claim 23 wherein each of said sealable layers is of a polymeric composition comprising a zinc ionomer of an interpolymer of ethylene and about 14 to about 16 percent by weight methacrylic acid, said ionomer having a degree of neutralization of from about 20 to about 24 percent and a melt index of from about 12 to about 16 grams per 10 minutes.
Claim 26
Dependent Claim
20 words
The film of claim 24 having a ten percent tensile secant modulus of from about 1,000 to about 30,000 p.s.i.
Claim 27
Dependent Claim
73 words
The film of claim 24 having a ten percent tensile secant modulus of from about 6,000 to about 14,950 p.s.i., an ultimate elongation of from about 175 to about 485 percent, a tensile strength of from about 3,000 to about 5,000 p.s.i., static coefficients of friction of each outer surface to metal, polyamides and polyesters of from about 0.3 to about 0.6, and thickness of from about 0.5 mil to about 3 mils.
Claim 28
Dependent Claim
22 words
The film of claim 5 wherein the elastomeric polymeric composition in said first layer is an elastomeric interpolymer of styrene and butadiene.
Claim 29
Dependent Claim
66 words
The film of claim 27 wherein each of said sealable layers is of a polymeric composition comprising a zinc ionomer of an interpolymer of ethylene and about 14 to about 16 percent by weight methacrylic acid, said ionomer having a degree of neutralization of from about 20 to about 24 percent and a melt index of from about 12 to about 16 grams per 10 minutes.
Claim 30
Dependent Claim
20 words
The film of claim 28 having a ten percent tensile secant modulus of from about 1,000 to about 30,000 p.s.i.
Claim 31
Dependent Claim
73 words
The film of claim 28 having a ten percent tensile secant modulus of from about 6,000 to about 14,950 p.s.i., an ultimate elongation of from about 175 to about 485 percent, a tensile strength of from about 3,000 to about 5,000 p.s.i., static coeffcients of friction of each outer surface to metal, polyamides and polyesters of from about 0.3 to about 0.6, and thickness of from about 0.5 ml to about 3 mils.
Claim 32
Dependent Claim
18 words
The film of claim 27 wherein the styrene-butadiene interpolymer is a thermoplastic block copolymer having polystyrene end blocks.
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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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |