Ray V. Lawrence

Improved procedure for the analysis (GLC) of resin acids

The analysis of resin acid content of rosin and oleoresin often is affected by neutral material. This problem can be overcome by analyzing the sample before esterification.

Esters of rosin and olefin epoxides

Rosin has been found to react extremely rapidly with commercially available olefin 1,2-epoxides to give hydroxy monoesters. These monoesters have been reacted further with rosin to give diesters. The diesters are ester gums, which are modified by the presence of a long aliphatic chain in the molecule. Preliminary results indicate that they are useful as tackifiers for SBR rubber.

Alkyd resins from fumaric and maleic modified pine oleoresin

Fumaric and maleic modified pine oleoresin can be used to prepare oil modified nonphthalic alkyd-type surface coating vehicles. These vehicles may find use in trim enamels, concrete maintenance paints, and as a fortifier for linseed oil exterior paints. Processing of these resins requires that the temperature be raised to 285°C. for 1 to 1.5 hours and then lowered to 265°C. for a time during the procedure. Fumaric modifications may hold some advantages over maleic modifications. Clear films formed from these resins are characterized by good hardness, flexibility, adhesion, toughness, gloss, and color retention. The shorter oil length resins exhibit these properties to the greatest extent.