US4486507A
Expired / Lapsed
US
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Transparent, shrinkable film, consisting of one or several layers
Assignee: Feldmuehle AG
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Filing: 1982-05-05
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Granted: 1984-12-04
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Expires: 2002-05-05
Abstract
Abstract A transparent, shrinkable film composed of at least one layer which is a mixture of 85-10 weight percent of a linear polyamide, linear copolyamide, or an elastomeric component, and 15-90 weight percent of a partially aromatic polyamide or partially aromatic copolyamide. The films of the present invention can be shrunken at economically feasible temperatures, shrink in such a way so as not to damage the goods encased therein and also possess desirable transparency and gas permeability properties.
Inventors
- 👤 Rudolf Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C61/00; B29C61/003; B29C61/06; B29C61/0608; B29C61/0616; B32B27/32; B32B27/322; B32B27/34; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L77/00; B29K; B29K2023/00; B29K2077/00; B32B38/00; B32B38/0012; B32B2038/0028; B32B2270/00; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/70; B32B2307/732; B32B2307/734; B32B2307/736; B32B2323/00; B32B2323/04; C08J2377/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
93 words
A transparent, shrinkable film comprising at least one layer of a polyolefin and at least one layer is of a polyamide composed of a mixture of 85 to 10 weight percent of a linear polyamide, linear copolyamide, or an elastomeric component selected from the group consisting of polybutadiene, mixtures of polyamides and polybutadiene, mixtures of polyamide and nitrile rubber, block copolymers of polyether segments and polyamide segments; and 15 to 90 weight percent of a partially aromatic polyamide or partially aromatic copolyamide, said film having been stretched at a temperature below 120° C.
Claim 2
Dependent Claim
93 words
A transparent, shrinkable film comprising at least one layer of a polyolefin and at least one layer is of a polyamide composed of a mixture of 85 to 10 weight percent of a linear polyamide, linear copolyamide, or an elastomeric component selected from the group consisting of polybutadiene, mixtures of polyamides and polybutadiene, mixtures of polyamide and nitrile rubber, block copolymers of polyether segments and polyamide segments; and 15 to 90 weight percent of a partially aromatic polyamide or partially aromatic copolyamide, said film having been stretched at a temperature below 120° C.
Claim 3
Dependent Claim
49 words
The film of claim 1 wherein the polyamide of said at least one layer is a mixture of 80 to 40 weight percent of a linear polyamide, a linear copolyamide, or an elastomeric component; and 20 to 60 weight percent of a partially aromatic polyamide or partially aromatic copolyamide.
Claim 4
Dependent Claim
15 words
The film of claim 1 or 2 wherein the partially aromatic polyamide is polyhexamethylene isophthalamide.
Claim 5
Dependent Claim
15 words
The film of claim 1 or 2 wherein the partially aromatic polyamide is polytrimethylhexamethylene terephthalamide.
Claim 6
Dependent Claim
14 words
The film of claim 1 or 2 wherein the linear polyamide is polyamide 66.
Claim 7
Dependent Claim
46 words
The film of claim 1 or 2 wherein the polyamide of said at least one layer is a mixture of 40 to 60 weight percent of polyamide 66, 20to 30 weight percent of partially aromatic polyamide, and 20 to 30 weight percent of amorphous linear copolyamide.
Claim 8
Dependent Claim
19 words
The film of claim 1 or 2 wherein the film is stretched at temperatures between 60° and 90° C.
Claim 9
Dependent Claim
18 words
The film of claim 1 or 2 wherein the stretching is accomplished by a vacuum deep drawing process.
Claim 10
Dependent Claim
20 words
The film of claim 1 or 2 wherein the polyolefin layer consists of a polyolefin with a high shrinkage force.
Claim 11
Dependent Claim
16 words
The film of claim 1 or 2 wherein the polyolefin layer consists of an ionomeric resin.
Claim 12
Dependent Claim
16 words
The film of claim 1 or 2 wherein the polyolefin layer consists of an ethylene copolymer.
Claim 13
Dependent Claim
16 words
The film of claim 11 wherein the polyolefin layer consist of mixtures of different ethylene copolymers.
Claim 14
Dependent Claim
21 words
The film of claim 12 wherein the polyolefin layer consist of polyethylene types of low density with a linear molecular structure.
Claim 15
Dependent Claim
18 words
The film of claim 13 wherein the polyolefin layer consists of mixtures of ethylene homopolymers and ethylene copolymers.
Claim 16
Dependent Claim
20 words
The film of claim 1 or 2 wherein there is more than one layer and the layers are glued together.
Claim 17
Dependent Claim
12 words
The film of claim 1 or 2 wherein the layers are coextruded.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |