| 摘要 |
<p>MPo767 Abridgement A process for manufacturing a sealant coated heat recoverable polymeric article is disclosed. The process includes the steps of extruding at least two different polymeric materials to form a unitary shaped article and thereafter exposing the shaped article to a source of radiation to thereby cross-link one of the polymeric materials and convert the other polymeric material into a tacky sealant. The article may be rendered dimensionally heat recoverable by either: a) deforming the article into a different shape at a temperature below the crystalline melt temperature of the cross-linkable material and then exposing the deformed article to a source of radiation or alternatively, b) subsequent to an irradiation step, heating the article to about the crystalline melt temperature of the cross-linked material, distorting the article, and then cooling the article while maintaining it in the distorted shape to a temperature below the crystalline melt temperature; thereby by either method rendering the crosslinked portion of the article recoverable toward its original shape upon subsequent heating.</p> |
