초록 ▼

A coextruded multilayer film having increased retention of volatile antioxidants and process for making the film. The multilayer film includes an antioxidant layer containing a volatile antioxidant, said antioxidant layer being semipermeable to the volatile antioxidant; and a barrier layer, impermea

A coextruded multilayer film having increased retention of volatile antioxidants and process for making the film. The multilayer film includes an antioxidant layer containing a volatile antioxidant, said antioxidant layer being semipermeable to the volatile antioxidant; and a barrier layer, impermeable to the volatile antioxidant. The film can be produced on a conventional blown film process with the barrier layer coextruded externally to the antioxidant layer. The barrier layer traps the volatile antioxidant inside the tube of the blown film process, reducing the amount of volatile antioxidant migrating from the film.

대표청구항 ▼

A method for making a coextruded film having increased retention of volatile antioxidants, comprising the step of coextruding in a blown film process: a) an inner antioxidant layer comprising a thermoplastic polymer containing a volatile antioxidant, the thermoplastic polymer being semipermeable wit

A method for making a coextruded film having increased retention of volatile antioxidants, comprising the step of coextruding in a blown film process: a) an inner antioxidant layer comprising a thermoplastic polymer containing a volatile antioxidant, the thermoplastic polymer being semipermeable with respect to the volatile antioxidant; and b) an outer barrier layer comprising a thermoplastic polymer impermeable with respect to the volatile antioxidant; said outer layer forming the outside of the tube in the blown film process.