Patent US4283426A successfully refreshed from Google Patents.
US4283426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose hydrate tubing with aging-resistant barrier layer and processes for the manufacture thereof
Assignee: Hoechst AG
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Filing: 1979-07-25
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Granted: 1981-08-11
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Expires: 1999-07-25
Abstract
Abstract Disclosed is a packaging material comprising a base layer of cellulose hydrate having on one surface a film coating which is impervious to water vapor, water and oxygen and which comprises a vinylidene chloride copolymer containing from about 90 to 92 percent by weight of vinylidene chloride, from about 5.5 to 7 percent by weight of acrylonitrile, from about 1.5 to 3.5 percent by weight of methyl methacrylate and from about 0.5 to 1.5 percent by weight of itaconic acid, said copolymer having a relative viscosity of about 1.04 measured at 23° C. in a 0.1 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and a relative viscosity of 2.8 measured at 23° C. in a 3 percent by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and said film coating having a thickness corresponding to a weight per unit area in the range between about 3 and 10 g/m 2 . Also disclosed are a sausage casing of such material and a method for producing same.
Inventors
- 👤 Harald Schenk
- 👤 Hermann Winter
- 👤 Walter Spietschka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:09
CPC Classifications
A; A22; A22C; A22C13/00; A22C13/0013; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1324
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
165 words
A packaging material comprising a base layer of cellulose hydrate having on one surface a film coating which is impervious to water vapor, water and oxygen and which comprises a vinylidene chloride copolymer containing from about 90 to 92 percent by weight of vinylidene chloride, from about 5.5 to 7 percent by weight of acrylonitrile, from about 1.5 to 3.5 percent by weight of methyl methacrylate and from about 0.5 to 1.5 percent by weight of itaconic acid, said copolymer having a relative viscosity of about 1.04 measured at 23° C. in a 0.1 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and a relative viscosity of 2.8 measured at 23° C. in a 3 percent by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and said film coating having a thickness corresponding to a weight per unit area in the range between about 3 and 10 g/m 2 .
Claim 2
Dependent Claim
165 words
A packaging material comprising a base layer of cellulose hydrate having on one surface a film coating which is impervious to water vapor, water and oxygen and which comprises a vinylidene chloride copolymer containing from about 90 to 92 percent by weight of vinylidene chloride, from about 5.5 to 7 percent by weight of acrylonitrile, from about 1.5 to 3.5 percent by weight of methyl methacrylate and from about 0.5 to 1.5 percent by weight of itaconic acid, said copolymer having a relative viscosity of about 1.04 measured at 23° C. in a 0.1 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and a relative viscosity of 2.8 measured at 23° C. in a 3 percent by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and said film coating having a thickness corresponding to a weight per unit area in the range between about 3 and 10 g/m 2 .
Claim 3
Dependent Claim
44 words
A packaging material as claimed in claim 1, wherein the film coating has a modulus of elasticity value after aging which is at most twice that of the film coating before aging, and wherein said value before aging is approximately 1,200 N/mm 2 .
Claim 4
Dependent Claim
32 words
A packaging material as claimed in claim 1, wherein an adhesion-promoting layer comprising a synthetic cationic resin is located between the film coating of copolymer and the base layer of cellulose hydrate.
Claim 5
Dependent Claim
26 words
A packaging material as claimed in claim 3, wherein the adhesion-promoting layer comprises a melamine/formaldehyde reaction product or a reaction product of epichlorohydrin with a polyamine/polyamide.
Claim 6
Dependent Claim
44 words
A packaging material as claimed in claim 1, wherein said copolymer contains about 91 percent by weight of vinylidene chloride, about 6.2 percent by weight of acrylonitrile, about 2.1 percent by weight of methyl methacrylate and about 0.7 percent by weight of itaconic acid.
Claim 7
Dependent Claim
39 words
A packaging material as claimed in claim 1, wherein the coating additionally contains a total of from about 1 to 5 percent by weight of a wax based on esterified montanic acid, polyethylene waxes, paraffin wax, and/or oxazoline wax.
Claim 8
Dependent Claim
36 words
A packaging material as claimed in claim 6 wherein the coating contains from about 0.5 to 5 percent by weight of an inorganic slip agent, such as kaolin, kaolin which has been rendered hydrophobic or silica.
Claim 9
Dependent Claim
24 words
A packaging material as claimed in claim 7, wherein the inorganic slip agent has a mean particle size of from about 1 to 3μ.
Claim 10
Dependent Claim
26 words
A packaging material as claimed in claim 7, wherein the coating contains a total of from about 5 to 15 percent by weight of a plasticizer.
Claim 11
Dependent Claim
25 words
A packaging material as claimed in claim 9, wherein said plasticizer comprises dibutyl phthalate, tributyl acetylcitrate, diisobutyl tartrate or an epoxidized unsaturated fatty acid ester.
Claim 12
Dependent Claim
12 words
A packaging material as claimed in claim 1, comprising a tubular configuration.
Claim 13
Dependent Claim
27 words
A sausage product comprising an artificial sausage casing and a meat-containing filling contained therein, wherein said sausage casing comprises said packaging material as defined by claim 1.
Claim 14
Dependent Claim
189 words
A process for the manufacture of packaging material, which comprises the steps of drawing a tubing of cellulose hydrate from a stock roll, applying a liquid lacquer solution to one side of the moving tubing, said solution containing a copolymer comprising from about 90 to 92 percent by weight of vinylidene chloride, from about 5.5 to 7 percent by weight of acrylonitrile, from about 1.5 to 3.5 percent by weight of methyl methacrylate and from about 0.5 to 1.5 percent by weight of itaconic acid, said copolymer having a relative viscosity of about 1.04, measured at 23° C. in a 0.1 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and a relative viscosity of about 2.8, measured at 23° C. in a 3 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, levelling the lacquer to a predetermined thickness and drying it to give a film coating which comprises said copolymer having a thickness corresponding to a weight per unit area in the range between about 3 and 10 g/m 2 .
Claim 15
Dependent Claim
189 words
A process for the manufacture of packaging material, which comprises the steps of drawing a tubing of cellulose hydrate from a stock roll, applying a liquid lacquer solution to one side of the moving tubing, said solution containing a copolymer comprising from about 90 to 92 percent by weight of vinylidene chloride, from about 5.5 to 7 percent by weight of acrylonitrile, from about 1.5 to 3.5 percent by weight of methyl methacrylate and from about 0.5 to 1.5 percent by weight of itaconic acid, said copolymer having a relative viscosity of about 1.04, measured at 23° C. in a 0.1 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, and a relative viscosity of about 2.8, measured at 23° C. in a 3 percent strength by weight solution in a mixture of tetrahydrofuran and toluene in the ratio of 70:30, levelling the lacquer to a predetermined thickness and drying it to give a film coating which comprises said copolymer having a thickness corresponding to a weight per unit area in the range between about 3 and 10 g/m 2 .
Claim 16
Dependent Claim
43 words
A process as claimed in claim 13, wherein the copolymer comprises about 91 percent by weight of vinylidene chloride, about 6.2 percent by weight of acrylonitrile, about 2.1 percent by weight of methyl methacrylate and about 0.7 percent by weight of itaconic acid.
Claim 17
Dependent Claim
43 words
A process as claimed in claim 13, wherein the lacquer solution contains a total of 1 to 5 percent by weight of a wax based on esterified montanic acid, polyethylene waxes, paraffin wax and/or oxazoline wax, relative to the weight of the coating.
Claim 18
Dependent Claim
37 words
A process as claimed in claim 13, wherein the coating lacquer contains 0.5 to 5 percent by weight of an inorganic slip agent in the form of kaolin or silica, relative to the weight of the coating.
Claim 19
Dependent Claim
20 words
A process as claimed in claim 16, wherein the slip agent has a mean particle size of 1 to 3μ.
Claim 20
Dependent Claim
46 words
A process as claimed in claim 13, wherein the coating lacquer contains a total of 5 to 15 percent by weight of a plasticizer for the synthetic copolymer, said plasticizer being selected from dibutyl phthalate, tributyl acetylcitrate, diisobutyl tartrate or an epoxidized unsaturated fatty acid ester.
Claim 21
Dependent Claim
36 words
A process as claimed in claim 13, wherein the lacquer solution contains a liquid, volatile fraction in the range from about 70 to 90 percent by weight relative to the total weight of the lacquer solution.
Claim 22
Dependent Claim
20 words
A process as claimed in claim 13, wherein the liquid, volatile fraction of the lacquer solution comprises an organic liquid.
Claim 23
Dependent Claim
28 words
A process as claimed in claim 20, wherein the volatile fraction of the lacquer solution comprises a mixture of tetrahydrofuran and toluene in the ratio of about 70:30.
Claim 24
Dependent Claim
35 words
A process as claimed in claim 13, wherein one side of the tubing of cellulose hydrate is coated with an adhesion-promoting layer of a synthetic cationic resin prior to applying the liquid lacquer solution thereto.
Claim 25
Dependent Claim
37 words
A process as claimed in claim 22, wherein the adhesion-promoting layer located between the tubing of cellulose hydrate and the liquid lacquer solution comprises a melamine/formaldehyde reaction product or a reaction product of epichlorohydrin with a polyamine/polyamide.
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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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |