Method of introducing breathability to a non-porous continuous plastic film
Abstract
Abstract A POROUS, BREATHABLE, POLYMER FILM IS PRODUCED BY FORMING A SUBSTANTIALLY NON-POROUS CONTINUOUS POLYMER FILM ON A SUPPORT MEMBER, APPLYING A LAYER OF FILM-FORMING POLYMER COMPOSITION TO SAID NON-POROUS FILM; AND HEATING THE RESULTING STRUCTURE ABOVE THE SOFTENING POINT OF THE NON-POROUS FILM TO FORM A UNITARY, POROUS BREATHABLE ARTICLE COMPRISED OF BOTH POLYMER LAYERS. THE FIRST POLYMER FILM CAN BE FORMED BY APPLYING TO THE SUPPORT MEMBER A LAYER OF A FIRST FILM-FORMING FLEXIBLE POLYURETHANE SOLUTION COMPRISING A POLYURETHANE COMPOSITION AND DILUENT THEREFOR. THE SUPPORT MEMBER CAN BE STRIPPED FROM THE FIRST POLYMER FILM. COATED FABRICS CAN ALSO BE PRODUCED BY APPLYING A FABRIC MATERIAL TO THE SECOND LAYER BEFORE HEATING THE RESULTING STRUCTURE TO FORM THE UNITARY POROUS, BREATHABLE ARTICLE.
Inventors
- 👤 C Wirth
- 👤 G Albi
Bibliographic Details
Claims Analysis
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