Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2008-06-06
2009-08-25
McClendon, Sanza L (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S109000, C522S110000, C522S111000, C522S071000, C522S074000, C522S150000, C522S157000, C522S158000, C522S161000, C522S184000, C522S186000, C522S189000, C522S906000, C525S211000, C525S221000, C525S227000, C525S222000, C525S240000, C525S070000, C525S198000, C525S195000, C525S191000, C525S197000, C264S234000, C264S232000, C264S236000, C264S017000, C264S237000, C264S018000
Reexamination Certificate
active
07579387
ABSTRACT:
An article suitable for use as an insulating or coating material comprises a radiation-crosslinked composition comprising a polyethylene, a polypropylene and optionally an ethylene-propylene elastomer. The polyethylene component is selected from high density polyethylene (HDPE), medium density polyethylene (MDPE) and linear medium density polyethylene (LMDPE) and the polypropylene component is either a homopolymer or copolymer. The composition is predominantly based on the polyethylene component and contains the polyethylene component in an amount of at least 50 percent by weight. The article is radiation-crosslinked to a sufficient degree that it possesses thermoset properties, such that when the article is heated to a temperature above the crystalline melting point of the polypropylene homopolymer or copolymer, it is softened but does not become liquid. The article is formed by first blending the polyethylene, polypropylene and optionally the ethylene-propylene elastomer, melt processing the blend to produce an article, crosslinking the article by exposing it to radiation, and optionally heating, stretching and cooling the article to impart heat shrinkability to the article.
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Heydrich Marcus P.
Jackson Peter
Schnuelle Karen
McClendon Sanza L
ShawCor Ltd.
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