Multilayer polymer hose line or tubing having reduced length...

Details Multilayer polymer hose line or tubing having reduced length... Multilayer polymer hose line or tubing having reduced length...

2006-11-07

2006-11-07

Watkins, III, William P. (Department: 1772)

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

C428S036800, C428S035700, C428S036600, C428S476300, C428S474400, C138S173000, C138S137000, C138S140000, C138S141000, C138S121000

Reexamination Certificate

active

07132141

ABSTRACT:
Two-layered or three-layered polymer tubing for use as a pressurized fluid conduit in automobiles can be either walled or have walls continuously or partially corrugated. The tubing has an outer layer of a hard polymer molding material and an inner layer of a soft rubber-like polymer or a polymer mixture. The inner layer can be provided on the innerside with a layer of a thermoplastic adhesion-modified elastomer composition. The a materials are selected for the layers to provide a so-called “hard-soft-combination”. The rubber-like polymer composition has a hardness in the range of 30 Shore A to 60 Shore D, especially of about 30 Shore A to 90 Shore A, the compositions being selected so that they are processable by coextrusion or the so-called conex method and adhere directly to each other non-positively or positively fitted, i. e. without additional bonding agent, without delaminating.

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