US4944970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging film, in particular a sausage casing, based on polyamide
Assignee: Hoechst AG
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Filing: 1989-01-18
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Granted: 1990-07-31
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Expires: 2009-01-18
Abstract
Abstract A tubular, biaxially stretch-oriented packaging film, in particular a sausage casing, comprising a polymer mixture which comprises an aliphatic polyamide, a polyterephthalic acid ester, an aromatic polyamide comprising branched aliphatic diamines having at least 7 carbon atoms and aromatic dicarboxylic acids, or aromatic diamines and aliphatic dicarboxylic acids having 5 to 11 carbon atoms and a dye. The weight amount of the aromatic polyamide is preferably equal to, and particularly preferably greater than, the weight amount of dye. A masterbatch suitable for producing the film is also disclosed. With particular advantage, the film having the above described composition can be dyed deep black or brilliant red.
Inventors
- 👤 Karl Stenger
- 👤 Hans Strutzel
- 👤 Guenther Crass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:16
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; A; A22; A22C; A22C13/00; A22C13/0013; C08J2377/00; C08J2477/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1324; Y10T428/1334; Y10T428/1345
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
55 words
A tubular, biaxially stretch-oriented packaging film which comprises a polymer mixture comprising: (a) a linear aliphatic polyamide, (b) a polyterephthalic acid ester, (c) an aromatic polyamide comprising the reaction product of (i) a branched aliphatic diamine and an aromatic dicarboxylic acid or (ii) an aromatic diamine and an aliphatic dicarboxylic acid, and (d) a dye.
Claim 2
Dependent Claim
55 words
A tubular, biaxially stretch-oriented packaging film which comprises a polymer mixture comprising: (a) a linear aliphatic polyamide, (b) a polyterephthalic acid ester, (c) an aromatic polyamide comprising the reaction product of (i) a branched aliphatic diamine and an aromatic dicarboxylic acid or (ii) an aromatic diamine and an aliphatic dicarboxylic acid, and (d) a dye.
Claim 3
Dependent Claim
50 words
A packaging film as claimed in claim 1, wherein said aromatic polyamide (c) comprises the reaction product of (i) a branched aliphatic diamine having at least 7 carbon atoms and an aromatic dicarboxylic acid, or (ii) an aromatic diamine and an aliphatic dicarboxylic acid having 5 to 11 carbon atoms.
Claim 4
Dependent Claim
47 words
A packaging film as claimed in claim 2, wherein said branched aliphatic diamine of said reaction product (i) comprises alkyl-substituted hexamethylene diamine units whereby the total number of carbon atoms contained in the alkyl substituent groups of each of said hexamethylene diamine units is at least three.
Claim 5
Dependent Claim
28 words
A packaging film as claimed in claim 3, wherein said alkyl groups are methyl, ethyl or propyl groups, and are the same as or different from each other.
Claim 6
Dependent Claim
35 words
A packaging film as claimed in claim 4, wherein said hexamethylene diamine units are substituted at the 2- and 4-positions with at least three methyl groups or at least one methyl and one ethyl group.
Claim 7
Dependent Claim
27 words
A packaging film as claimed in claim 4, wherein said hexamethylene diamine units are substituted at the 3-position with at least one ethyl, propyl or butyl group.
Claim 8
Dependent Claim
24 words
A packaging film as claimed in claim 2, wherein said aromatic dicarboxylic acid of said reaction product (i) comprises terephthalic acid or isophthalic acid.
Claim 9
Dependent Claim
20 words
A packaging film as claimed in claim 2, wherein said aromatic diamine of said reaction product (ii) is xylylene diamine.
Claim 10
Dependent Claim
21 words
A packaging film as claimed in claim 2, wherein said aliphatic dicarboxylic acid of said reaction product (ii) is adipic acid.
Claim 11
Dependent Claim
19 words
A packaging film as claimed in claim 1, wherein said linear aliphatic polyamide (a) comprises polyamide-6,6, Nylon-6 or polyamide-12.
Claim 12
Dependent Claim
34 words
A packaging film as claimed in claim 1, wherein said linear aliphatic polyamide (a) has a relative viscosity in the range from about 2.5 to 4.5, measured in 96% sulfuric acid at 20° C.
Claim 13
Dependent Claim
17 words
A packaging film as claimed in claim 1, wherein said polyterephthalic acid ester (b) is polybutylene terephthalate.
Claim 14
Dependent Claim
63 words
A packaging film as claimed in claim 1, wherein said polymer mixture comprises from about 65 to 85% by weight of said linear aliphatic polyamide (a), from about 7 to 15% by weight of said polyterephthalic acid ester (b), from about 4 to 19% by weight of said aromatic polyamide (c), and from about 0.5 to 10% by weight of said dye (d).
Claim 15
Dependent Claim
28 words
A packaging film as claimed in claim 13, wherein the weight amount of said aromatic polyamide (c) is not less than the weight amount of said dye (d).
Claim 16
Dependent Claim
21 words
A packaging film as claimed in claim 13 comprising from 8 to 14% by weight of said polyterephthalic acid ester (b).
Claim 17
Dependent Claim
23 words
A sausage product comprising a sausage meat emulsion and an artificial sausage casing formed from a packaging film as claimed in claim 1.
References Cited (Backward Citations)
GB1102851A
Cited
US4133802A
Cited
US4120928A
Cited
US4243074A
Cited
US4486507A
Cited
US4659599A
Cited
US4764406A
Cited
DE8708867U1
Cited
US4812534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |