Patent US4294882A successfully refreshed from Google Patents.
US4294882A
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Heat-sealable antistatic polypropylene films
Assignee: British Cellophane Ltd
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Filing: 1979-08-23
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Granted: 1981-10-13
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Expires: 1999-08-23
Abstract
Abstract An oriented heat-sealable antistatic polypropylene film is manufactured by applying to one or both surfaces of a base polypropylene film, preferably by co-extrusion, a layer of a heat-sealable olefinic polymer (for example, a predominantly linear random copolymer of ethylene with butene-1) containing between 0.2 and 10% by weight of an anionic hydrocarbyl (preferably long chain alkyl) sulphonate. A slip agent, for example oleamide, may also be incorporated in the base polypropylene film. The antistatic film has improved heat-sealing properties which permits it to be run successfully on packaging machinery at high speeds.
Inventors
- 👤 William J. Andrews
- 👤 David J. C. Espley
- 👤 William J. M. Philpott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B27/322; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C09; C09J; C09J123/00; C09J123/02; C09J123/04; B32B2250/00; B32B2250/03; B32B2250/24; B32B2250/242; B32B2307/00; B32B2307/20; B32B2307/21; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/744; B32B2323/00; B32B2323/04; B32B2323/10; B32B2553/00; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00; C08L; C08L2666/00; C08L2666/02; C08L2666/24; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
72 words
A method for the manufacture of an oriented heat-sealable antistatic polypropylene film comprising applying to one or both sides of a base polypropylene film a layer of a heat-sealable olefinic polymer capable of forming a heat-seal below 140° C., the olefinic polymer layer containing between 0.2 and 10% by weight of an antistatic agent comprising an anionic hydrocarbyl sulphonate, and stretching the combination in one or more directions under stretch orientatable conditions.
Claim 2
Independent Claim
72 words
A method for the manufacture of an oriented heat-sealable antistatic polypropylene film comprising applying to one or both sides of a base polypropylene film a layer of a heat-sealable olefinic polymer capable of forming a heat-seal below 140° C., the olefinic polymer layer containing between 0.2 and 10% by weight of an antistatic agent comprising an anionic hydrocarbyl sulphonate, and stretching the combination in one or more directions under stretch orientatable conditions.
Claim 3
Dependent Claim
31 words
A method as claimed in claim 1 in which the anionic hydrocarbyl sulphonate is present in the olefinic polymer in an amount in the range between 0.3 and 2.0% by weight.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 1 in which the slip agent is incorporated in the base polypropylene film in an amount in the range between 0.05 and 5.0% by weight.
Claim 5
Dependent Claim
36 words
A method as claimed in claim 1 in which the base polypropylene film is co-extruded with one or between two layers of the heat-sealable olefinic polymer through a slot or annular die orifice followed by quenching.
Claim 6
Dependent Claim
23 words
A method as claimed in claim 1 in which the hydrocarbyl group in the anionic hydrocarbyl sulphonate is a long chain alkyl group.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 5 wherein the long chain alkyl group contains at least 10 carbon atoms.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 6 wherein the long chain alkyl group contains from 12 to 18 carbon atoms.
Claim 9
Dependent Claim
14 words
A method as claimed in claim 1 in which the olefinic polymer is polyethylene.
Claim 10
Dependent Claim
28 words
A method as claimed in claim 1 in which the olefinic polymer is a random copolymer of propylene with ethylene and/or butene-1 having a major content of propylene.
Claim 11
Dependent Claim
30 words
A method as claimed in claim 1 in which the olefinic polymer is a predominantly linear random copolymer of ethylene with propylene and/or butene-1 having a major content of ethylene.
Claim 12
Dependent Claim
18 words
A method as claimed in claim 1 in which said antistatic agent consists of said anionic hydrocarbyl sulphonate.
Claim 13
Dependent Claim
51 words
An oriented heat-sealable antistatic polypropylene film comprising a base polypropylene film having on one or both surfaces a layer of an olefinic polymer capable of forming a heat-seal below 140° C., the olefinic polymer layer containing between 0.2 and 10% by weight of an antistatic agent comprising an anionic hydrocarbyl sulphonate.
Claim 14
Dependent Claim
51 words
An oriented heat-sealable antistatic polypropylene film comprising a base polypropylene film having on one or both surfaces a layer of an olefinic polymer capable of forming a heat-seal below 140° C., the olefinic polymer layer containing between 0.2 and 10% by weight of an antistatic agent comprising an anionic hydrocarbyl sulphonate.
Claim 15
Dependent Claim
26 words
A polypropylene film as claimed in claim 12 in which the olefinic polymer layer contains between 0.3 and 2.0% by weight of the anionic hydrocarbyl sulphonate.
Claim 16
Dependent Claim
23 words
A polypropylene film as claimed in claim 12 wherein the hydrocarbyl group in the anionic hydrocarbyl sulphonate is a long chain alkyl group.
Claim 17
Dependent Claim
21 words
A polypropylene film as claimed in claim 14 wherein the long chain alkyl group contains from 12 to 18 carbon atoms.
Claim 18
Dependent Claim
27 words
A polypropylene film as claimed in claim 12 in which on manufacture the base polypropylene film contains between 0.05 and 5.0% by weight of a slip agent.
Claim 19
Dependent Claim
19 words
A polypropylene film as claimed in claim 12 in which said antistatic agent consists of said anionic hydrocarbyl sulphonate.
References Cited (Backward Citations)
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Cited
US3592879A
Cited
GB1440317A
Cited
US3936422A
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Cited
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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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |