Moisture resistant coated metal substrates
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United States of America Patent
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Jun 4, 2002
Grant Date -
N/A
app pub date -
Feb 23, 2000
filing date -
Apr 29, 1997
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Abstract
The present invention relates to coated metal substrates such as metal piping having improved environmental stress crack resistance and resistance to hydrolytic and/or cathodic disbondment. The coating composition contains a blend of modified and unmodified polyolefins as well as a tackifier. For cathodic disbondment resistance, the preferred tackifiers are rosin esters or hydrogenated versions thereof. The modified polyolefins are grafted versions of metallocene or non-metallocene produced low density or high density polyethylenes.
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