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US 5,478,620 AGranted
Multilayer plastic pipe
AssigneeHuels Aktiengesellschaft
InventorsJoachim Mugge, Hubertus Ohm, Hans-Dieter Herrmann, Hans Ries
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Abstract
Multilayer plastic pipes comprising a polyamide-based inner and outer layer, wherein the inner and outer layer are connected force-lockingly by means of at least one intermediate layer made of a mixture of a linear crystalline polyester and a polyamide, have improved stability to chemical agents and improved mechanical properties.
Claims9
A multilayer plastic pipe, comprising polyamide inner and outer layers, wherein
- said inner and outer layers are connected by means of at least one intermediate layer comprising (i) a mixture of a linear crystalline polyester and a polyamide or (ii) a polyester/polyamide copolymer, wherein said polyester and polyamide are present in a weight ratio ranging from 30 to 70:70 to 30.
A multilayer plastic pipe having polyamide inner and outer layers, wherein
- said inner and outer layers are connected by means of an intermediate layer consisting of (i) a mixture of a linear crystalline polyester and a polyamide or (ii) a polyester/polyamide copolymer, wherein said polyester and polyamide are present in a weight ratio ranging from 30 to 70:70 to 30.
Dependencies are inferred from the claim text.