Orientated Acrylate Adhesive Materials, Method for the Production and Use Thereof
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United States of America Patent
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Issued Date -
Nov 20, 2008
app pub date -
Jan 4, 2005
filing date -
Jan 16, 2004
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Abandoned
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Abstract
The invention relates to an oriented pressure-sensitive adhesive and to a process for preparing it. The pressure-sensitive adhesive comprises an acrylate-based UV-crosslinked polymer which is synthesized in a mass fraction of at least 50% from at least one acrylic monomer according to the general formula (I) in which R.sub.1 is hydrogen (H) or a methyl group (CH.sub.3) and R.sub.2 is hydrogen (H) or a branched or unbranched, saturated C.sub.1 to C.sub.30 hydrocarbon radical, which may optionally be substituted by a functional group, the pressure-sensitive adhesive, in the form of a film applied as a melt (hotmelt), having a preferential direction which is characterized in the free film by a shrinkback of at least 3% relative to an original stretching of the film in the preferential direction. The orientation is generated after polymerization by means of a suitable coating process and is subsequently 'frozen in' by UV crosslinking. The pressure-sensitive adhesive is outstandingly suitable for use as an adhesive layer on single-sided or double-sided adhesive tapes.
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