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US 6,635,701 B2Granted
Oriented high density polyethylene film, compositions and process suitable for preparation thereof
AssigneeEquistar Chemicals, LP
InventorsRichard F. Tate, James V. Krohn
Life of this patent
Estimating the term…
Abstract
The draw ratio and/or rate of stretch of HDPE in film orientation can be increased, or the breakage frequency at a given draw ratio and draw rate decreased by the addition of an orientation improving amount of a normally solid fatty carboxylic acid having a melting point lower than the orientation temperature of the film.
Claims9
In a process for the orientation of high density polyethylene (HDPE) film containing conventional additives by stretching an HDPE film at an orientation temperature below the film's melt temperature, the improvement comprising:
- adding to the HDPE prior to preparing said film, a normally solid fatty carboxylic acid having a melting point lower than said orientation temperature, in an amount of from 0.02 weight percent to about 1 weight percent, said weight percents based on the sum of the weights of HDPE and fatty carboxylic acid in said film, said HDPE being substantially free of filler such that filler-created microvoids are substantially avoided.
Dependencies are inferred from the claim text.