HOLLOW BODY WITH IMPROVED BARRIER ACTION
The present invention relates to hollow bodies with improved barrier action, where the hollow bodies are composed of a three-layer sandwich structure with a shell made of polystyrene and with a middle layer as vapor barrier.
1 .- 6 . (canceled)
7 . A hollow body with improved barrier action, wherein the hollow body is composed of a three-layer sandwich structure with a shell made of polystyrene and with a middle layer as vapor barrier.
8 . The body according to claim 7 , wherein the middle layer is a polyolefin.
9 . The body according to claim 8 , wherein the middle layer also comprises from 0.1 to 30% of a styrene-butadiene block copolymer.
10 . A process for producing a hollow body according to claim 7 , which comprises first producing a hollow body made of polystyrene and of a middle layer as vapor barrier, in an injection-molding process, and then using blow molding to shape said body.
11 . The process according to claim 10 , wherein injection stretch blow molding is used to shape the body.
12 . The process according to claim 10 , wherein the middle layer is a polyolefin.
13 . The process according to claim 10 , wherein the middle layer also comprises from 0.1 to 30% of a styrene-butadiene block copolymer.
14 . A bottle which comprises the hollow body according to claim 7 .