US4294882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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
2026-10-25 15:13
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)
GB1145199A
Cited
US3592879A
Cited
GB1440317A
Cited
US3936422A
Cited
US4117193A
Cited
US4123475A
Cited
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 |