US4123589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes and food casing made therefrom particularly by extrusion and stretching
Assignee: Naturin Werk Becker and Co
•
Filing: 1976-12-23
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Granted: 1978-10-31
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Expires: 1996-12-23
Abstract
Abstract A novel elastic polyurethane having outstanding properties for use in making mono- and multi-layer food casings, more especially sausage casings, by extrusion. Stretching, especially biaxial stretching, gives further improvement. The casings can be boiled and scalded without folding or wrinkling when cooled. The polyurethane comprises a particular combination of components which imparts the desired properties.
Inventors
- 👤 Rudi Korlatzki
- 👤 Gunter Schuhmacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:44
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; A; A22; A22C; A22C13/00; A22C13/0013; B32B27/40; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; A22C2013/0059; B32B38/00; B32B38/0012; B32B2038/0028; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1324; Y10T428/31504; Y10T428/31551; Y10T428/31554; Y10T428/31562; Y10T428/31565; Y10T428/31573; Y10T428/3158; Y10T428/31583
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
153 words
A food casing comprising at least one layer of plastic material, such layer comprising a polyurethane elastomer exhibiting thermoplastic properties on processing, the polyurethane consisting essentially of base units derived from the reaction of (a) at least one high molecular weight diol, (b) at least one di-isocyanate, and (c) at least one low molecular weight glycol as chain-extender, both the base units derived from both the high molecular weight diol and the di-isocyanate consisting essentially of linear C 6 -aliphatic units, the equivalent ratio of high molecular diol to di-isocyanate base units being in the range of approximately 1:3.5 to 1:70, the quantity-weight ratio of said base units being in the range of from approximately 1:0.4 to 1:4.0, respectively, the equivalent ratio of the low molecular glycol to high molecular diol being from approximately 5:1 to 70:1, the chain extender comprising no more than approximately 50 mole-% of linear C 6 -aliphatic units.
Claim 2
Dependent Claim
153 words
A food casing comprising at least one layer of plastic material, such layer comprising a polyurethane elastomer exhibiting thermoplastic properties on processing, the polyurethane consisting essentially of base units derived from the reaction of (a) at least one high molecular weight diol, (b) at least one di-isocyanate, and (c) at least one low molecular weight glycol as chain-extender, both the base units derived from both the high molecular weight diol and the di-isocyanate consisting essentially of linear C 6 -aliphatic units, the equivalent ratio of high molecular diol to di-isocyanate base units being in the range of approximately 1:3.5 to 1:70, the quantity-weight ratio of said base units being in the range of from approximately 1:0.4 to 1:4.0, respectively, the equivalent ratio of the low molecular glycol to high molecular diol being from approximately 5:1 to 70:1, the chain extender comprising no more than approximately 50 mole-% of linear C 6 -aliphatic units.
Claim 3
Dependent Claim
26 words
A food casing according to claim 1 in which the low molecular weight glycol includes 1,6-hexanediol in a proportion of no more than 50 mol percent.
Claim 4
Dependent Claim
34 words
A food casing according to claim 2 in which the remaining glycol component of the low molecular weight glycol is selected from the group consisting of ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol and neopentyl glycol.
Claim 5
Dependent Claim
14 words
A food casing according to claim 1, in which the di-isocyanate comprises 1,6-hexamethylene di-isocyanate.
Claim 6
Dependent Claim
18 words
A food casing according to claim 1, wherein the chain-extender comprises at least one low molecular weight glycol.
Claim 7
Dependent Claim
12 words
A food casing according to claim 5, wherein the chain-extender comprises 1,4-butanediol.
Claim 8
Dependent Claim
16 words
A food casing according to claim 6, wherein the chain-extender comprises 1,4-butanediol, in combination with 1,6-hexanediol.
Claim 9
Dependent Claim
19 words
A food casing according to claim 1, in which the polyurethane has a molecular weight of at least 2000.
Claim 10
Dependent Claim
24 words
A food casing according to claim 1, which has been biaxially stretched in ratios of from approximately 1:1 to 1:4 both longitudinally and transversely.
Claim 11
Dependent Claim
38 words
A food casing according to claim 1, in which at least one polyurethane layer has been co-extruded with at least one layer of material selected from the group consisting of polyurethane, polyvinylchloride, polyvinylidene chloride, polyamides, polyesters and polyacrylonitriles.
Claim 12
Dependent Claim
12 words
A food casing according to claim 10, having a polyurethane outermost layer.
Claim 13
Dependent Claim
16 words
A process for making a food casing, which comprises extruding the polyurethane composition of claim 1.
Claim 14
Dependent Claim
15 words
A process according to claim 12, in which the casing is formed by blow extrusion.
Claim 15
Dependent Claim
30 words
A process according to claim 12 in which the extruded casing is biaxially stretched, the longitudinal and transverse stretch ratios each being in the range of from 1:1 to 1:4.
Claim 16
Dependent Claim
68 words
A food casing according to claim 1, the equivalent ratio of high molecular weight diol to di-isocyanate base units in the polyurethane being in the range of from approximately 1:10 to 1:50, and the quantity weight ratio of said base units being in the range of from approximately 1:0.6 to 1:3.5 and the equivalent ratio of the chain-extender to the high molecular weight diol being 7:1 to 60:1.
Claim 17
Dependent Claim
71 words
A food casing according to claim 1, the equivalent ratio of high molecular weight diol to di-isocyanate base units of the polyurethane being in the range of 1:15 to 1:30, the quantity weight ratio of said base units being in the range of approximately 1:0.8 to 1:3.0 and the equivalent ratio of the chain extender to the high molecular weight diol being in the range of from approximately 9:1 to 50:1.
Claim 18
Dependent Claim
34 words
A food casing according to claim 1 characterized in that at least one layer comprises a polyurethane elastomer which is derived from high molecular weight diols of a molecular weight of 500 or more.
Claim 19
Dependent Claim
20 words
A food casing according to claim 1, in which the high molecular weight diol consists essentially of a polyester diol.
Claim 20
Dependent Claim
17 words
A food casing according to 18 wherein the polyester diol is based on adipic acid and 1,6-hexanediol.
Claim 21
Dependent Claim
17 words
A food casing according to 18 wherein the polyester diol is based on adipic acid and 1,6-hexanediol.
Claim 22
Dependent Claim
15 words
A food casing according to claim 18, wherein the polyester diol is based on poly-ε-caprolactone.
Claim 23
Dependent Claim
36 words
A food casing according to claim 18 wherein the polyester diol is based on adipic acid and 1,6-hexanediol and a further diol, wherein the 1,6-hexanediol constitutes a major portion of the diol component of the polyester.
Claim 24
Dependent Claim
14 words
A food casing according to claim 18 wherein the polyester diol comprises poly ε-caprolactone.
Claim 25
Dependent Claim
24 words
A food casing according to claim 1 wherein the ratio of NCO groups to OH groups is in the range of 0.95 to 1.00.
Claim 26
Dependent Claim
32 words
A food casing according to claim 1 wherein the polyurethane is prepared by simultaneously reacting (a) said high molecular weight diol, (b) said diisocyanate, and (c) said chain-extender in a reaction vessel.
References Cited (Backward Citations)
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US3926706A
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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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |