Hollow body suitable for receiving diffusible substances, coated with resin varnish, and a process for its production and its use
AssigneesDaimler-Benz Aktiengesellschaft, Herberts GmbH
InventorsManfred Mass, Gunter Walter
Life of this patent
Estimating the term…
Abstract
The invention comprises a hollow body, suitable for receiving diffusible substances and made of plastics material coated with varnish resins, the external surface of which has a roughness, measured in profile according to DIN 4768, Part I, of Rz=from 2 to 150 .mu.m and R.sub.max =from 5 to 250 .mu.m on which a coating, positively linked with that surface to provide a seal against diffusion of liquids and gases present in the body, consisting of a chemically crosslinked polyurethane resin is located in a layer thickness of from 10 to 800 .mu.m.
Claims13
Hollow body, suitable for receiving diffusible substances and made of substantially non-elastomeric plastics material coated with varnish resins, characterized in that said body possesses an external surface having a roughness obtained by blasting with a granular blasting agent, measured in profile according to DIN 4768, Part 1, of Rz=from 10 to 150 .mu.m, and R.sub.max =from 100 to 250 .mu.m on which a coating, positively linking with that surface and providing a seal against diffusion of liquids and gases present in the body, consisting of a chemically crosslinked polyurethane resin is located in a layer thickness of from 60 to 800 .mu.m.
Dependencies are inferred from the claim text.