Patent US4348457A successfully refreshed from Google Patents.
US4348457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealable multilayer film of polyolefins
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
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Filing: 1980-10-14
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Granted: 1982-09-07
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Expires: 2000-10-14
Abstract
Abstract A sealable multilayer film for packaging comprising a polypropylene film and at least one sealing layer of an ethylene homo- or copolymer wherein the sealing layer contains an additive combination of a long-chain amine, a thermoplastic polymer incompatible with the sealing polymer and a polydialkyl siloxane.
Inventors
- 👤 Heinrich Rosenthal
- 👤 Ingo Schinkel
- 👤 Gunter Eger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:10
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/10; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/518; B32B2323/00; B32B2323/04; B32B2323/10; B32B2553/00; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/28; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31938
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A multilayer film comprising a polypropylene layer and at least one heat sealable layer comprising polyethylene or an ethylene copolymer containing at least 4% by weight of ethylene, the heat sealable layer containing an additive combination comprising: (1) from 0.3 to 1% by weight, based on the sealable layer, of a long-chain aliphatic amine; (2) from 0.1 to 0.7% by weight, based on the sealable layer, of dispersed thermoplastic polymer which is incompatible with the polyethylene or ethylene copolymer and which has a softening range which is not more than either 50° C. below or 50° C. above the softening point of the polyethylene or ethylene copolymer; and (3) from 0.3 to 0.8% by weight, based on the sealable layer, of a polydialkyl siloxane.
Claim 2
Dependent Claim
124 words
A multilayer film comprising a polypropylene layer and at least one heat sealable layer comprising polyethylene or an ethylene copolymer containing at least 4% by weight of ethylene, the heat sealable layer containing an additive combination comprising: (1) from 0.3 to 1% by weight, based on the sealable layer, of a long-chain aliphatic amine; (2) from 0.1 to 0.7% by weight, based on the sealable layer, of dispersed thermoplastic polymer which is incompatible with the polyethylene or ethylene copolymer and which has a softening range which is not more than either 50° C. below or 50° C. above the softening point of the polyethylene or ethylene copolymer; and (3) from 0.3 to 0.8% by weight, based on the sealable layer, of a polydialkyl siloxane.
Claim 3
Dependent Claim
29 words
A multilayer film as claimed in claim 1, wherein the additive combination comprises from 0.4 to 0.7% by weight, based on the sealable layer, of the long-chain aliphatic amine.
Claim 4
Dependent Claim
29 words
A multilayer film as claimed in claim 1, wherein the additive combination comprises from 0.15 to 0.50% by weight, based on the sealable layer, of the dispersed thermoplastic polymer.
Claim 5
Dependent Claim
28 words
A multilayer film as claimed in claim 1, wherein the additive combination comprises from 0.3 to 0.6% by weight, based on the sealable layer, of the polydialkyl siloxane.
Claim 6
Dependent Claim
42 words
A multilayer film as claimed in claim 1, wherein the polypropylene is an isotactic polypropylene having a density of from 0.90 to 0.91 g/cc and a melt flow index of from 1 to 4 g/10 mins at 230° C./2.16 kp/cm 2 pressure.
Claim 7
Dependent Claim
33 words
A multilayer film as claimed in claim 1, wherein the sealable layer comprises a high-density polyethylene or a statistical ethylene/propylene copolymer containing 95% by weight of propylene and 5% by weight of ethylene.
Claim 8
Dependent Claim
22 words
A multilayer film as claimed in claim 1, wherein the long-chain aliphatic amine (1) is an N,N-bis-(2-hydroxyethyl)-(C 12 -C 16 )-alkyl amine.
Claim 9
Dependent Claim
33 words
A multilayer film as claimed in claim 1, wherein the thermoplastic polymer (2) is an ethylene/methacyclic acid copolymer optionally at least partly present in the form of an alkali salt or polylauric lactam.
Claim 10
Dependent Claim
16 words
A multilayer film as claimed in claim 1, wherein the polydialkyl siloxane (3) is polydimethyl siloxane.
Claim 11
Dependent Claim
16 words
A packaging film especially for cigarette packs comprising a multilayer film as claimed in claim 1.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |