Inert rosin esters and process for preparing the same
AssigneeArizona Chemical Company
InventorsErwin R. Ruckel, Martin Epstein
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Abstract
Inert esters of rosin and a primary polyhydric alcohol, such as rosin-pentaerythritol esters, are modified by reacting commercially available rosin esters which contain residual hydroxyl groups with a lower aliphatic carboxylic acid or anhydride, for example, acetic anhydride or propionic anhydride, to substantially completely esterify the residual hydroxyl groups. The resulting inert, completely esterified rosin esters, when formulated with non-polar natural rubber or SBR in adhesive systems, results in a time-stable tack value not available with conventional rosin esters.
Claims10
A modified rosin ester of a primary polyhydric alcohol, said ester having 50 to 95 percent of the hydroxyl groups of the polyhydric alcohol esterified with rosin and the remaining hydroxyl groups esterified with lower aliphatic monocarboxylic acid or acid chloride or acid anhydride and no more than negligible residual hydroxyl content.
Dependencies are inferred from the claim text.