Process for preparing packaging material suitable for sausage casings and articles manufactured therefrom
AssigneeHoechst Aktiengesellschaft
InventorsKlaus-Dieter Hammer, Gunter Gerigk, Wolfgang Klendauer
Life of this patent
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Abstract
Disclosed is a packaging material suitable for manufacturing synthetic sausage casings, comprised of a cellulose hydrate base layer, an optional adhesive layer and a layer of a vinylidene chloride-containing copolymer, as well as several methods for preparing the packaging material and sausage casings therefrom.
Claims24
Process for the preparation of a sausage casing, comprising the steps of coating the inside surface of a tube comprised of cellulose hydrate with an adhesive priming layer of an organic, synthetic material;
- applying to said primed inside surface a layer of a vinylidene chloride-containing copolymer comprised of from about 86 to 90% by weight of vinylidene chloride and from about 10 to 14% by weight of a mixture of copolymerizable monomers comprised of a .alpha.,.beta.-unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, an ester of said carboxylic acid selected from a group consisting of acrylic acid esters, methacrylic acid esters and mixtures thereof, and acrylonitrile, said copolymer having been produced by copolymerization of a mixture of said vinylidene chloride and said copolymerizable monomers, the refractive index of said copolymer being substantially independent of temperature between about 40.degree. C. and 80.degree. C. and a solution of said polymer in tetrahydrofuran having a concentration dependent relative viscosity according to curve A in FIG. 3;
- adjusting the moisture content of the coated tube to a predetermined value;
- aging the tube for a period of at least about 3 days;
- and longitudinally gathering the aged tube to produce a shirred tube.
Process for the preparation of a sausage casing, comprising the steps of:
- coating the inside surface of a tube comprised of cellulose hydrate with a surface layer of a vinylidene chloride-containing copolymer, said cellulose hydrate being in a gelled condition and said vinylidene chloride-containing copolymer being applied directly to said inside surface in the form of an aqueous dispersion, said copolymer comprising from about 84 to 92% by weight of vinylidene chloride and from about 8 to 15% by weight of a mixture of copolymerizable monomers comprised of an .alpha.,.beta.-unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, and an ester of said carboxylic acid selected from the group consisting of acrylic acid esters, methacrylic acid esters and mixtures thereof, a major portion of said monomer mixture being comprised of said ester, said copolymer having been produced by copolymerization of a mixture of said vinylidene chloride and said copolymerizable monomers, the refractive index of said copolymer being substantially independent of temperature between about 40.degree. C. and 80.degree. C.;
- a 1% by weight solution of said copolymer in tetrahydrofuran having a specific viscosity of at least about 1.8 and a 2% by weight solution of said copolymer in tetrahydrofuran having a specific viscosity of at least about 3;
- adjusting the water content of the coated tube to a predetermined value;
- aging the coated tube;
- and gathering the aged tube to form a shirred tube.
Dependencies are inferred from the claim text.