Multi-layer, coextruded, biaxially oriented tubular sausage casing with improved oxygen barrier properties
| Title: | Multi-layer, coextruded, biaxially oriented tubular sausage casing with improved oxygen barrier properties |
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| Patent Number: | 5,985,386 |
| Publication Date: | November 16, 1999 |
| Appl. No: | 08/968,919 |
| Application Filed: | November 06, 1997 |
| Abstract: | The invention relates to a multi-layer, coextruded, biaxially oriented tubular sausage casing with improved oxygen barrier properties especially for wrapping sausages, which are heat treated after filling. |
| Inventors: | von Widdern, Michael Hennig-Cardinal (Walsrode, DEX); Reiners, Ulrich (Neuenkirchen, DEX) |
| Assignees: | Bayer Aktiengesellscaft (Leverkusen, DEX) |
| Claim: | We claim |
| Claim: | 1. A coextruded, biaxially orientated, tubular sausage casing of a total of 35 to 70 .mu.m thick and which comprises a laminate of at least four layers with |
| Claim: | at least one interior layer of said casing denoted (A) |
| Claim: | one external layer of said casing denoted (D) |
| Claim: | between said layers (A) and (D) at least one layer (B) and at least one further polymer layer (C) |
| Claim: | wherein |
| Claim: | layers (A) and (D) consist essentially of an aliphatic polyamide 6, polyamide 11, polyamide 6.6, aliphatic copolyamide of polyamide 6 and polyamide 6.6, polyamide 6.8, polyamide 6.9, polyamide 6.10, polyamide 6.11, polyamide 6.12, a copolymer of the monomer units contained therein, or a blend of the above-mentioned aliphatic polyamides or copolyamides; wherein at least one of the polyamide layers contains 70 to 95 wt. % of an aliphatic polyamide, copolyamide, or blend thereof, and from 3 to 30 wt. % related to the total weight of the polymer blend of at least one |
| Claim: | partially aromatic polyamide or copolyamide |
| Claim: | copolymer based on ethylene or propylene, polyester, copolyester, or blends thereof |
| Claim: | water vapor barrier layer (C) comprises a homopolymer or copolymer of ethylene or propylene between interior polyamide layer A and layer B, the homopolymer or copolymer layer (C) comprising ethylene or propylene in major amount and containing functional acid groups, and |
| Claim: | layer B consists essentially of ethylene/vinyl alcohol copolymer having an ethylene content of 20 to 50 wt. % and resulting from at least 85% saponification of an ethylene/vinyl acetate copolymer starting material, the ethylene/vinyl alcohol copolymer optionally containing an additional olefinic component selected from the group consisting of propylene, 1-butene, 1-pentene and 4-methyl-1-pentene; or the ethylene/vinyl alcohol copolymer being blended with another polymer compatible therewith, which other polymer is present in less than 50% by weight of the blend, said laminate being biaxially oriented to a draw ratio of 9-10.24. |
| Current U.S. Class: | 428/348; 428/354; 428/366; 428/367; 428/220; 4284/758; 4284/761; 4284/763; 4284/769 |
| Current International Class: | B32B 2730; B32B 2732; B32B 2734; A22C 1300 |
| Patent References Cited: | 4058647 November 1977 Inove et al. 4254169 March 1981 Schroeder 4472485 September 1984 Tabuse et al. 4892765 January 1990 Hisazumi et al. 5055355 October 1991 DeAntonis et al. 5185189 February 1993 Stenger et al. |
| Primary Examiner: | Nakarani, D. S. |
| Attorney, Agent or Firm: | Sprung Kramer Schaefer & Briscoe |
| Accession Number: | edspgr.05985386 |
| Database: | USPTO Patent Grants |
| Language: | English |
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