Aliphatic petroleum-based resins having controlled softening points and molecular weights and hot melt pressure sensitive adhesive containing same
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United States of America Patent
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Aug 22, 2000
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app pub date -
Mar 3, 1997
filing date -
Mar 6, 1996
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Abstract
The invention provides a petroleum-based aliphatic resin having: a) a Ring and Ball (R&B) softening point in the range of about 75 to about 110.degree. C., b) a weight average molecular weight (Mw) of about 1000 to about 2600 Dalton, a z-average molecular weight (Mz) from about 1900 to about 5000 Dalton and an Mw/Mn below about 2.0, c) a level of aromatic protons below about 1.5% with respect to the total protons determined by .sup.1 H-NMR, and d) a mixed methylcyclohexane aniline cloud point (MMAP) of about 90.degree. C. or less. The resins according to the invention are characterized by a high amount of cyclic structures. Further disclosed is a method of independently controlling the R&B softening point and the molecular weight of an aliphatic resin composition during its preparation by polymerization of a petroleum-based feed, the method being characterized in that the amount of cyclic structures in the resins is increased.
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