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US 9,532,578 B2Granted
Smokable thermoplastic casing
AssigneeViskase Companies, Inc.
InventorsAamir W. Siddiqui, Nancy Tamez de Caballero
Life of this patent
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Abstract
A novel smokable thermoplastic film, smokable by both liquid smoke and gaseous smoke, that may be produced as a film or a tube, as in a food casing. This newly disclosed film is a blend of a polyamide base, an amorphous polyvinyl alcohol and, optionally, an antiblocking agent.
Claims17
A smokable, heat-shrinkable film useable for food packaging, the film comprising:
- (i) at least one hydrophilic, copolyvinyl alcohol resin with a high amorphous content, in amounts of from about 20 wt. % to about 70 wt. %, based on the weight of the film,
- wherein the copolyvinyl alcohol resin comprises
- (A) a poly vinyl alcohol (“PVA”) resin having a 1,2-diol structural unit represented by the following general formula:
- and having a saponification degree of 80 to 97.9 mol-%;
- and
- (B) an alkylene oxide adduct of a polyvalent alcohol containing 5 to 9 moles of an alkylene oxide per 1 mole of the polyvalent alcohol;
- (ii) at least one polyamide, in amounts of from about 30 wt. % to about 80 wt. %, based on the weight of the film;
- and
- a) wherein the polyamide is aliphatic or a blend of aliphatic and amorphous polyamide;
- and
- (iii) optionally, at least one antiblock agent, in amounts of from about 3 wt. % to about 5 wt. %, based on the weight of the film;
- and that allows the transfer of both liquid and gaseous smoke through the film.
9 more elements
A smokable, heat-shrinkable film useable for food packaging, the film comprising:
- (i) a hydrophilic, amorphous, copolyvinyl alcohol resin having a melt flow index determined at 210° C. and 2.16 kg from 2 to 4 g/10 minutes, a melting point of 154° C., and less than 0.5% of volatile matter, in amounts of from about 20 wt. % to about 70 wt. %, based on the weight of the film;
- (ii) at least one polyamide selected from the group consisting of nylon 6, nylon 66, nylon 6,12, nylon 6/12 copolymer, nylon 6/66 copolymer, and nylon 6I/6T, in amounts of from about 30 wt. % to about 80 wt. %;
- and
- (iii) the copolyvinyl alcohol resin optionally comprises at least one further additive selected from the group consisting of a slip additive, antioxidant, pigment, dye, filler, and mixtures thereof;
- wherein both liquid and gaseous smoke is transferable through the film.
2 more elements
A film comprising, based upon the weight of the film:
- from about 20 wt. % to about 70 wt. % of at least one copolyvinyl alcohol resin, wherein the copolyvinyl alcohol resin is hydrophilic and amorphous, and wherein the copolyvinyl alcohol resin has a melt flow index determined at 210° C. and 2.16 kg from 2 g to 4 g/10 minutes and a percentage of volatile matter of less than 0.5%;
- from about 30 wt. % to about 80 wt. % of at least one polyamide, wherein the polyamide is aliphatic or a blend of aliphatic and amorphous polyamide;
- and
- from about 3 wt. % to about 5 wt. % of at least one antiblock agent selected from the group consisting of barium sulfate, diatomaceous earth, silica, calcium carbonate, fatty amides and ceramic spheres;
- wherein both liquid and gaseous smoke transfer though the film, and wherein the film is seamless, tubular, and biaxially stretched.
2 more elements
Dependencies are inferred from the claim text.