Rosin esters and compositions thereof

Abstract

Rosin esters are provided. The rosin esters can exhibit improved color (e.g., the rosin esters can have a pure Gardner color of 8.5 or less), improved oxidation stability (e.g., when 1000 ppm or less of an antioxidant is combined with the In the presence of a combination of rosin esters, the rosin ester is capable of exhibiting an oxidation induction time of at least 75 minutes at 130°C), improved color stability (e.g., the rosin ester is heated to a temperature of 160°C for a period of 3 hours capable of exhibiting less than 10% pure Gardner color change), or a combination thereof. Also provided are polymeric compositions comprising the rosin esters and methods of making the rosin esters.

Description

technical field [0001] This application relates generally to rosin esters and methods of making and using them. Background technique [0002] Rosin esters, including those derived from polyols, have been known for over 50 years (see, eg, US Patent No. 1,820,265 to Bent et al.). Rosin esters are generally derived from rosin (which is primarily an isomeric C 20 tricyclic monocarboxylic acid) with an alcohol such as glycerol or pentaerythritol. The resulting rosin esters are used as additives in a variety of applications including, for example, as tackifiers in hot melt and pressure sensitive adhesives, modifiers for rubber and various plastics, emulsifiers for synthetic rubbers , the base material for chewing gum, resins in coating compositions such as traffic paints and inks, and sizing agents for papermaking. [0003] While suitable for many applications, many existing rosin esters do not possess suitable properties for particular applications. In particular, many commer...

AI Technical Summary

Problems solved by technology

[0003] Although suitable for many applications, many existing rosin esters do not have suitable properties for specific applications

In particular, many commercially available rosin esters are colored (e.g. yellow or tan) and exhibit poor oxidation stability

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