US4420516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite films for deep-drawn packings
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
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Filing: 1982-03-22
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Granted: 1983-12-13
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Expires: 2002-03-22
Abstract
Abstract The invention relates to composite packing films shrinkable by deep drawing and consisting of at least one copolyamide layer containing at least 50% by weight of epsilon -caprolactam units and at least one heat-sealable layer, and optionally, an adhesion-promoting layer.
Inventors
- 👤 Wolfgang Ermert
- 👤 Hans W. Funk
- 👤 Rudi Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:24
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/32; B32B27/34; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
70 words
A heat-sealable composite film shrinkable by deep drawing, which comprises (1) at least one layer of at least one copolyamide 6/12 containing at least 50% by weight of ε-caprolactam units and having a melting temperature of 75° to 215° C., (2) at least one heat-sealable layer of a copolymer containing at least 50 mole percent of ethylene and, optionally, (3) an adhesive or adhesion-promoting layer between layers 1 and 2.
Claim 2
Dependent Claim
70 words
A heat-sealable composite film shrinkable by deep drawing, which comprises (1) at least one layer of at least one copolyamide 6/12 containing at least 50% by weight of ε-caprolactam units and having a melting temperature of 75° to 215° C., (2) at least one heat-sealable layer of a copolymer containing at least 50 mole percent of ethylene and, optionally, (3) an adhesive or adhesion-promoting layer between layers 1 and 2.
Claim 3
Dependent Claim
22 words
A composite film as claimed in claim 1, wherein the melting temperature range of the copolyamide is from 160° to 200° C.
Claim 4
Dependent Claim
20 words
A composite film as claimed in claim 1, wherein the copolyamide contains besides ε-caprolactam units, units derived from lauric lactam.
Claim 5
Dependent Claim
28 words
A composite film as claimed in claim 1, wherein the copolymer of layer 2 comprises units of ethylene and of an α,β-unsaturated C 3 -C 5 -monocarboxylic acid.
Claim 6
Dependent Claim
31 words
A composite film as claimed in claim 4, wherein the monocarboxylic acid units are at least partly present in the form of salts of alkaline metals, alkaline earth metals or Zn.
Claim 7
Dependent Claim
28 words
A composite film as claimed in claim 1, wherein the ethylene copolymer has a melt index of from 0.5 to 40 g/10 mins. according to DIN 53 735.
Claim 8
Dependent Claim
42 words
A composite film as claimed in claim 1, wherein layer 1 also includes from 5 to 30% by weight of an ethylene/vinyl acetate copolymer containing from 50 to 80% by weight of vinyl acetate units, of which at least 90% are saponified.
Claim 9
Dependent Claim
20 words
A heat-sealable composite film according to claim 1, wherein said layer of copolyamide 6/12 additionally contains a saponified ethylene/vinylacetate copolymer.
Claim 10
Dependent Claim
19 words
A heat-sealable composite film according to claim 1, wherein said layer of copolyamide 6/12 additionally contains an ionomer resin.
Claim 11
Dependent Claim
19 words
A heat-sealable composite film according to claim 8, wherein said layer of copolyamide 6/12 additionally contains an ionomer resin.
Claim 12
Dependent Claim
20 words
A heat sealable composite film according to claim 1, wherein said layer of copolyamide 6/12 consists essentially of copolyamide 6/12.
Claim 13
Dependent Claim
25 words
A heat sealable composite film according to claim 1, wherein said film has a shrinkage in volume of at least 40% after having been deep-drawn.
Claim 14
Dependent Claim
15 words
A heat sealable composite film according to claim 12, wherein said shrinkage is at 50%.
Claim 15
Dependent Claim
16 words
A heat sealable composite film according to claim 13, wherein said shrinkage is at least 75%.
Claim 16
Dependent Claim
12 words
A heat sealable composite film according to claim 1 which is pleat-free.
References Cited (Backward Citations)
JPS5277187A
Cited
US4302511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |