USRE31269E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sealable antistatic polypropylene films
Assignee: British Cellophane Ltd
•
Filing: 1982-05-11
•
Granted: 1983-06-07
•
Expires: 2002-05-11
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
2026-10-27 11:19
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: 15
Claim 1
Independent Claim
82 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 .Iadd.which contains from 0.05 to 5.0% weight of a slip agent .Iaddend.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
82 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 .Iadd.which contains from 0.05 to 5.0% weight of a slip agent .Iaddend.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
53 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. .[.3. A method as claimed in claim 1 in which the slip agent is incorporated in the base polypropylene film in an
Claim 4
Dependent Claim
37 words
amount in the range between 0.05 and 5.0% by weight..]. 4. 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
Claim 5
Dependent Claim
26 words
through a slot or annular die orifice followed by quenching. 5. A method as claimed in claim 1 in which the hydrocarbyl group in the anionic
Claim 6
Dependent Claim
27 words
hydrocarbyl sulphonate is a long chain alkyl group. 6. A method as claimed in claim 5 wherein the long chain alkyl group contains at least 10 carbon
Claim 7
Dependent Claim
14 words
atoms. 7. A method as claimed in claim 6 wherein the long chain alkyl
Claim 8
Dependent Claim
15 words
group contains from 12 to 18 carbon atoms. 8. A method as claimed in claim
Claim 9
Dependent Claim
27 words
1 in which the olefinic polymer is polyethylene. 9. A method as claimed in claim 1 in which the olefinic polymer is a random copolymer of propylene
Claim 10
Dependent Claim
58 words
with ethylene and/or butene-1 having a major content of propylene. 10. 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. .[.11. A method as claimed in claim 1 in which said antistatic agent consists of said anionic
Claim 11
Dependent Claim
64 words
hydrocarbyl sulphonate..]. 12. An oriented heat-sealable antistatic polypropylene film comprising a base polypropylene film .[.having.]. .Iadd.which contains from 0.05 to 5.0% by weight of a slip agent and which has .Iaddend.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
Claim 12
Dependent Claim
64 words
hydrocarbyl sulphonate..]. 12. An oriented heat-sealable antistatic polypropylene film comprising a base polypropylene film .[.having.]. .Iadd.which contains from 0.05 to 5.0% by weight of a slip agent and which has .Iaddend.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
Claim 13
Dependent Claim
21 words
comprising an.]. anionic hydrocarbyl sulphonate. 13. A polypropylene film as claimed in claim 12 in which the olefinic polymer layer contains
Claim 14
Dependent Claim
35 words
between 0.3 and 2.0% by weight of the anionic hydrocarbyl sulphonate. 14. A polypropylene film as claimed in claim 12 wherein the hydrocarbyl group in the anionic hydrocarbyl sulphonate is a long chain alkyl group.
Claim 15
Dependent Claim
70 words
. A polypropylene film as claimed in claim 14 wherein the long chain alkyl group contains from 12 to 18 carbon atoms. .[.16. 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..]. .[.17. A polypropylene film as claimed in claim 12 in which said antistatic agent consists of said anionic hydrocarbyl sulphonate..].
References Cited (Backward Citations)
GB1115456A
Cited
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |