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Use of Recovered Light Oils from Rosin Ester Manufacture

IP.com Disclosure Number: IPCOM000011447D
Publication Date: 2003-Feb-20
Document File: 3 page(s) / 31K

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Abstract

This technical disclosure covers the use of rosin ester light oils recovered/ collected during the manufacture of rosin ester resins, which are then normally burned as fuel, as a part or full replacement for rosin in the manufacture of rosin esters or other rosin modified products.

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Use of Recovered Light Oils from Rosin Ester Manufacture

This technical disclosure covers the use of rosin ester light oils recovered/ collected during the manufacture of rosin ester resins, which are then normally burned as fuel, as a part or full replacement for rosin in the manufacture of rosin esters or other rosin modified products.

Prior Art

The manufacture of rosin-modified products is well documented, examples of which, are covered by the following US patent numbers and the patents listed with-in them 4,447,354, 4,690,783, 5,969,092.  Rosin is a well known, commercially available product which is mainly a mixture of C20 fused ring monocarboxylic acids, up to 95% dependent on rosin quality, with the structure being typified by abietic acid. The balance is made up of fatty acids and neutrals which comprise of various aldehydes, phenols, sterols, and dipentene alcohols and aldehydes. The rosin utilised for this disclosure is normally derived from wood, gum or tall oil rosin.

Rosin can be modified by hydrogenation, disproportionation and polymerisation to improve stability from oxidation and increase softening point. One of the primary uses of rosin is an esterification reaction with an alcohol to produce a product suitable for utilisation in adhesive and coating formulations. Alcohols that can be utilised for this process include but are not restricted to pentaerythritol, glycerol, diethylene glycol, triethylene glycol, decyl alcohol, trimethylolpropane and cyclohexanedimethanol (CHDM). Prior to esterification the rosin my be disproportionated with or fortified with fumaric acid or maleic anhydride to respectively improve color/ color stability or increase softening point of the final esterified product. Typically the esterification is carried out via a batch process and at temperatures in the range of 250 to 300oC and it is normal to use some form of catalyst to achieve a commercially viable esterification. The products are normally reacted to an acid value of between 20-40 and then cooled to between 200-250oC and the reaction is progressed to the final required acid value and softening point through steam distillation, steam sparging, vacuum stripping or evaporation through a short path evaporator.

Description of Invention

All the literature currently published covers the manufacture of rosin modified products based upon a particular purity or modification of rosin feed but do not discuss the use of so called light oils which are collected during either steam sparging, steam stripping, vacuum stripping or evaporation through a short path evaporator, to give the desired acid number and softening point. This invention uses these light oils to reduce the cost of manufacturing and to recycle a raw material feed that would otherwise be disposed of through burning.

For the purposes of this disclosure the oils are collected as a by-product using any of the above mentioned processes from the esterification of wood or gum or tall oil rosin with...