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US3640734A Expired / Lapsed US ⏱️ 0.0 years remaining

Preparation of fibrous reinforced casing from alkali soluble polyvinyl alcohol copolymers

Assignee: Continental Group Inc
•
Filing: 1968-10-21
•
Granted: 1972-02-08
•
Expires: 1988-10-21
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Abstract

Abstract A novel fibrous casing for packaging sausages and other meat and food products comprises a saturating tissue, preferably a long fiber hemp paper, coated or impregnated with an insolubilized polyvinyl alcohol/polyvinyl ester copolymer. The casing is preferably prepared by coating or impregnating a saturating tissue with an aqueous alkaline solution of a polyvinyl alcohol/polyvinyl ester copolymer which is then insolubilized by treatment with acid and optionally by further treatment with a suitable cross-linking agent, viz formaldehyde, etc. The saturating tissue may be coated or impregnated with the polyvinyl alcohol copolymer solution and immediately formed into a tubular casing and the polyvinyl alcohol copolymer regenerated therein by acid treatment or may be coated or impregnated in sheet form, neutralized and dried and subsequently slit to size and formed into a tubular casing in a separate seaming operation. Casings are preferably formed using long fiber hemp paper as the saturating tissue and using polyvinyl alcohol copolymers having a D.S. of OH groups in the range from about 25-80 percent.

Inventors

  • 👤 Seymour Oppenheimer
  • 👤 Albin F Turbak

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 18:05
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/919; B29C48/03; B29C48/09; B29C48/10

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 19 words
A meat casing as defined in claim 1 in which the copolymer contains 0.1-25 percent D.S. of carboxyl functionality.
Claim 2
Dependent Claim 24 words
A meat casing as defined in claim 1 in which the casing is formed into a tube at the time of saturating and coating.
Claim 3
Dependent Claim 31 words
A meat casing as defined in claim 1 in which the casing is saturated and coated as flat stock, dried, and subsequently formed into a tube with an adhesively bonded seam.
Claim 4
Dependent Claim 29 words
A meat casing as defined in claim 4 in which the adhesive used to form said seam is a polyvinyl alcohol or an adhesive chemically reactive with polyvinyl alcohol.
Claim 5
Independent Claim 102 words
A method of preparing a synthetic meat casing comprising, a. saturating and coating a long fiber saturating tissue with an aqueous alkaline solution of an alkali-soluble polyvinyl alcohol/polyvinyl ester copolymer having a D.S. of 25-80 percent with respect to OH groups and a molecular weight greater than about 50,000. b. contacting the coated and saturated tissue with an acid bath to coagulate and regenerate said polymer and produce a fiber-reinforced film, c. forming said tissue longitudinally into a tube and forming a seam therein, d. washing said acid treated tissue to remove byproduct salts, and e. drying said saturated and coated tissue.
Claim 6
Dependent Claim 23 words
A method as defined in claim 6 in which the casing is formed into a tube at the time of saturating and coating.
Claim 7
Dependent Claim 19 words
A method as defined in claim 6 in which said casing is impregnated with a plasticizer for polyvinyl alcohol.
Claim 8
Dependent Claim 22 words
A method as defined in claim 6 in which said tissue is formed into a tube prior to contacting said acid bath.
Claim 9
Dependent Claim 26 words
A method as defined in claim 6 in which said tissue is formed into a tube having a longitudinal seam secured by adhesive, subsequent to drying.
Claim 10
Dependent Claim 25 words
A method as defined in claim 6 in which said copolymer is polyvinyl alcohol/polyvinyl acetate, or polyvinyl alcohol/polyvinyl acetate copolymerized with acrylic or maleic acid.
Claim 11
Dependent Claim 23 words
A method as defined in claim 6 in which said copolymer coating is cross-linked by reaction with a cross-linking agent for polyvinyl alcohol.
Claim 12
Dependent Claim 20 words
A method as defined in claim 9 in which a cross-linking agent is added in admixture with said copolymer solution.
Claim 13
Dependent Claim 20 words
A method as defined in claim 12 in which the coated and saturated tissue is contacted with a cross-linking agent.

References Cited (Backward Citations)

GB386161A Cited
US2210436A Cited
US2169250A Cited
US2430065A Cited
US2780401A Cited
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US3348997A Cited
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US3516960A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-07 1975-08-09 1976-02-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-07 1979-08-09 1980-02-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-07 1983-08-09 1984-02-08 $7700.00 Window Closed / Lapsed

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