Dupont Teijin Films U.S. Ltd.

Other

Dupont Teijin Films U.S. Limited Partnership

Kenneth Evans

Stephen William Sankey

William Alasdair MacDonald

Mark Russell Hodgson

Pierre Georges Osborne Moussalli

Julian Peter Attard

David Boyce

Christopher Charles Naylor

Brian John Farmer, Legal Representative

David Edward Robins, Legal Representative

A process for the production of a polymeric film comprising a copolyester having an acid component and a diol component, said acid component comprising a dicarboxylic acid and a sulfomonomer containing a sulfonate group attached to the aromatic nucleus of an aromatic dicarboxylic acid, said process comprising the steps of: (i) melt-extruding a layer of said copolyester; (ii) stretching the extrudate in at least one direction; (iii) heat-setting the film by raising the temperature of the stretched film to a temperature Tin a first heating zone such that (T&#x2212;Tis in the range of from 5 to 30&#xb0; C., and then raising the temperature of the film to a temperature Tin a second heating zone such that (T&#x2212;Tis in the range of from 0 to 10&#xb0; C., wherein Tis the peak melting temperature of the polymeric film; wherein Tis greater than T; and wherein the times which a transverse section of the film spends in the first and second heating zones are defined by tand t, respectively, such that the ratio of tto tis at least 2:1; and a polymeric film obtainable thereby having an ultimate tensile strength at destruction in the range of 2 to 15 kgf/mmin the machine direction and 2.5 to 17 kgf/mmin the transverse direction.

Brittle polymeric film and tamper evident labels made therefrom

A process for the production of a polymeric film comprising a copolyester having an acid component and a diol component, said acid component comprising a dicarboxylic acid and a sulfomonomer containing a sulfonate group attached to the aromatic nucleus of an aromatic dicarboxylic acid, said process comprising the steps of: (i) melt-extruding a layer of said copolyester; (ii) stretching the extrudate in at least one direction; (iii) heat-setting the film by raising the temperature of the stretched film to a temperature Tin a first heating zone such that (T-T) is in the range of from 5 to 30&#xb0; C., and then raising the temperature of the film to a temperature Tin a second heating zone such that (T-Tis in the range of from 0 to 10&#xb0; C., wherein Tis the peak melting temperature of the polymeric film; wherein Tis greater than T; and wherein the times which a transverse section of the film spends in the first and second heating zones are defined by tand t, respectively, such that the ratio of tto tis at least 2:1; and a polymeric film obtainable thereby having an ultimate tensile strength at destruction in the range of 2 to 15 kgf/mmin the machine direction and 2.5 to 17 kgf/mmin the transverse direction.

Process for the production of brittle polymeric film

A heat-sealable polymeric film includes a substrate layer of polymeric material having on a surface thereof a heat-sealable coating layer. The layer includes a copolyester and is less than 8 &#x3bc;m in thickness. The copolyester consists essentially of repeat units of one or more aromatic dicarboxylic acids, one or more aliphatic dicarboxylic acids, and a stoichiometric amount of a glycol component consisting of one or more glycols selected from the group consisting of aliphatic glycols and cycloaliphatic glycols.

Process for the production of coated polymeric film

A process for producing a heat-sealable polymeric film comprises the steps of:

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Cleveland, United Kingdom

Kenneth Evans