US 2012/0070592 A1 · Permeable Polymeric Films and Methods of Making Same

Abstract

A method of making a film and the resulting film are disclosed. A matrix polymer comprising at least 20 wt. % nylon-6 is combined with moisture-absorbing particles and mixed in an extensional flow mixer to disperse the moisture-absorbing particles in the matrix polymer. The mixed composition is formed into a film comprising at least 20 wt. % matrix polymer and 1 wt. % moisture-absorbing particles. The film is oriented in at least one direction by a ratio of at least 1.2:1 to provide an unperforated, oriented film having a thickness of at least 20 microns and a water transmission rate of at least 24 g/m2/hr. The film is useful in food casing applications.

Claims22

Dependent claims

A method of making a film comprising:

heating matrix polymer comprising at least 50 wt. % nylon-6 based on the weight of the matrix polymer;
adding moisture-absorbing particles to the matrix polymer to form a combination of matrix polymer and moisture-absorbing particles;
mixing the combination of matrix polymer and moisture-absorbing particles in an extensional flow mixer to make a mixed composition having the moisture-absorbing particles dispersed in the matrix polymer;
forming the mixed composition into a film comprising at least 20 wt. % matrix polymer and 1 wt. % moisture-absorbing particles, based on the weight of the film;
and
orienting the film in at least one direction by a ratio of at least 1.2:1 to provide an unperforated, oriented film having a thickness of at least 20 microns and a water transmission rate of at least 24 g/m2/hr.

3 more elements

Dependencies are inferred from the claim text.

Permeable Polymeric Films and Methods of Making Same

Life of this patent

Permeable Polymeric Films and Methods of Making Same

Life of this patent

Abstract

Claims22