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Rosin by itself has low stability due to unsaturation. The utility of rosin resins can be improved via several chemical modifications. These modifications include esterification, hydrogenation, dimerization, functionalization, or any combination of these. Each of these modifications is discussed in the category links below. Since there are so many ways in which to modify rosin; coupled with the fact that there are three distinct sources for the base rosin, make rosin resin product lines difficult to comprehend. Figure 1 is a simplified schematic diagram of the production flow for various rosin resins. Although not shown completely, wood rosin and tall oil rosin can be esterified, hydrogenated, dimerized, or functionalized in the same manner as gum rosin.
Cloud Points and Resin Compatibility
For practical purposes, the cloud points may be related to compatibility as follows:
• MMAP is a measurement of aromatic solubility and determines the aliphatic/aromatic character of the resin. The lower the MMAP value, the more aromatic the resin.
• DACP determines the polarity of the resin due to the highly polar nature of the solvent system. Since specific adhesion is related to the polarity of a resin,the DACP cloud point can be used as a specific adhesion indicator. The lower the DACP value, the better the specific adhesion of a resin.
• OMS—This determination is only meaningful for aromatic resins since other resin types give OMS values lower than –30°C (–22°F). Most laboratories are not equipped to operate at such low temperatures, therefore the method becomes impracticable.
Remark:
• DACP determines the polarity of the resin due to the highly polar nature of the solvent system. Since specific adhesion is related to the polarity of a resin,the DACP cloud point can be used as a specific adhesion indicator. The lower the DACP value, the better the specific adhesion of a resin.
• MMAP is a measurement of aromatic solubility and determines the aliphatic/aromatic character of the resin. The lower the MMAP value, the more aromatic the resin.
rosin resin Typical values
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