Acyclic polymers containing a large number of isoprene subunits, usually unsaturated.
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1] typical of isopropyl groups derived from lignin decomposition are more visible in semicoking liquids, while mono-, sesqui-, and polyterpenes manifest themselves at 2800-3000 and 800-840 [cm.
Rosin derivatives, polyterpenes and petroleum resins can be used for pressure-sensitive adhesives.