US4659599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-based tubular packaging film
Assignee: Hoechst AG
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Filing: 1985-09-30
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Granted: 1987-04-21
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Expires: 2005-09-30
Abstract
Abstract A tubular packaging film, in particular a sausage casing for scalded and cooked sausages. The polymer mixture of said film has, on a 100 parts polymer basis, from 30 to 90 parts by weight homopolyamide or copolyamide, and from 70 to 10 parts polyterephthalic acid ester and/or copolyester of terephthalic and isophthalic acid units. The polyester is formed with an aliphatic or alicyclic diol. The film also optionally contains additives such as silicone oils which improve slip properties.
Inventors
- 👤 Hans Strutzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
A; A22; A22C; A22C13/00; A22C13/0013; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1324
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
82 words
A tubular packaging film suitable for use as a sausage casing, wherein said tubular film consists essentially of a polymer mixture of, on a 100 parts polymer basis: from about 30 parts to about 95 parts of a polyamide selected from the group consisting of homopolyamides, copolyamides, and mixtures thereof; and from about 70 parts to about 5 parts of a polyester having repeating units selected from the group consisting of terephthalic units and a mixture of terephthalic and isophthalic units acids.
Claim 2
Dependent Claim
82 words
A tubular packaging film suitable for use as a sausage casing, wherein said tubular film consists essentially of a polymer mixture of, on a 100 parts polymer basis: from about 30 parts to about 95 parts of a polyamide selected from the group consisting of homopolyamides, copolyamides, and mixtures thereof; and from about 70 parts to about 5 parts of a polyester having repeating units selected from the group consisting of terephthalic units and a mixture of terephthalic and isophthalic units acids.
Claim 3
Dependent Claim
43 words
A packaging film as claimed in claim 1, wherein said polyester is produced from a diol of the formula HO--R--OH, wherein R is selected from the group consisting of (CH 2 )hd n and ##STR1## and wherein n is from 2 to 6.
Claim 4
Dependent Claim
16 words
A packaging film as claimed in claim 2, wherein R is (CH 2 ) 4 .
Claim 5
Dependent Claim
47 words
A packaging film as claimed in claim 1, wherein said polyamide comprises units selected from the group consisting of (A) --NH--CO--(CH 2 ) x --CO--NH--(CH 2 ) y -- and (B) --NH--CO--(CH 2 ) z -- wherein x, y and z are integers from 2 to 7.
Claim 6
Dependent Claim
19 words
A packaging film as claimed in claim 4, wherein said polyamide contains units of --NH--CO--(CH 2 ) 5 --.
Claim 7
Dependent Claim
34 words
A packaging film as claimed in claim 1, wherein said film is biaxially oriented, and wherein said mixture further contains from about 0.05 to about 1.2 parts per 100 parts polymer of a polysiloxane.
Claim 8
Dependent Claim
28 words
A packaging film as claimed in claim 6, wherein said polysiloxane is present in an amount of from about 0.07 to about 0.5 parts per 100 parts polymer.
Claim 9
Dependent Claim
29 words
A packaging film as claimed in claim 6, wherein said polysiloxane is polydimethyl siloxane having a viscosity of from about 10 to about 100,000 mm 2 /s (23° C.).
Claim 10
Dependent Claim
27 words
A packaging film as claimed in claim 8, wherein the viscosity of said dimethyl siloxane is from about 500 to about 30,000 mm 2 /s (23° C.).
Claim 11
Dependent Claim
36 words
A packaging film as claimed in claim 1, wherein the amount of said polyamide is from about 95 to about 75 parts and the amount of said polyester is from about 5 to about 25 parts.
Claim 12
Dependent Claim
36 words
A packaging film as claimed in claim 1, wherein the amount of said polyamide is from about 50 to about 30 parts, and the amount of said polyester is from about 50 to about 70 parts.
Claim 13
Dependent Claim
38 words
A packaging film as claimed in claim 1, wherein the amount of said polyamide is from about 35 parts to about 50 parts, and the amount of said polyester is from about 65 parts to about 50 parts.
Claim 14
Dependent Claim
60 words
A packaging film as claimed in claim 1, wherein said casing increases in circumference when filled with material at 20° C. and thereafter further increases in circumference when treated with water at 80° C., such that the ratio of circumference increase due to said filling to the increase due to said water treatment is from about 0.8 to about 1.2.
Claim 15
Dependent Claim
13 words
A packaging film as claimed in claim 1, wherein said film is shirred.
Claim 16
Dependent Claim
23 words
A packaging film as claimed in claim 1, wherein said mixture of terephthalic and isophthalic units contains at least about 80% terephthalic units.
Claim 17
Dependent Claim
72 words
A packaging film as claimed in claim 1, wherein said polyester is produced from a diol of the formula HO--R--OH, wherein R is selected from the group consisting of (CH 2 ) n and ##STR2## and wherein n is from 2 to 6; and wherein the amount of said polyamide is from about 95 to about 75 parts and the amount of said polyester is from about 5 to about 25 parts.
Claim 18
Dependent Claim
72 words
A packaging film as claimed in claim 1, wherein said polyester is produced from a diol of the formula HO--R--OH, wherein R is selected from the group consisting of (CH 2 ) n and ##STR3## and wherein n is from 2 ot 6; and wherein the amount of said polyamide is from about 50 to about 30 parts, and the amount of said polyester is from about 50 to about 70 parts.
Claim 19
Dependent Claim
24 words
A packaging film as claimed in claim 6, wherein said film has a wall thickness of from about 10 μm to about 50 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |