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Technical Data Sheet
Lewisol™ 28-M Resin


Applications
  • Adhesives/sealants-B&C
  • Carpet construction
  • Commerical printing inks
  • Film modification
  • Paints & coatings
  • Polymer modification
  • Protective coatings
  • Road markings
  • Roofing ingredients
  • Solder flux
  • Tires
  • Wax ingredients
  • Wire/cable

Product Description
Lewisol™ 28-M resin is a glycero-ester of rosin modified with maleic anhydride. It is a hard thermoplastic resin that offers excellent solubility, good solvent evaporation and low viscosity in solutions used in formulating RS Nitrocellulose lacquers. These and other properties make Lewisol™ 28-M resin particularly well suited for use in lacquers, low temperature heat-cured enamels, RS Nitrocellulose based printing inks and grease resistant coatings.

Typical Properties

PropertyTest MethodTypical Value, Units
General
Acid Number (mg KOH/g) 42
Ring and Ball Softening PointASTM E 28131 °C
Gardner Viscosityb H
Gardner Colora >9
Form Solid in irregular crushed lumps
Appearance Amber-colored crystalline solid
Specific Gravity >1
Solubility 
     in Water Negligible
Description, Base Resin Maleic Acid modified Glycerol Ester of Gum Rosin

a50% solids in xylene
b60% solids in xylene



Compatibility and Solubility

Lewisol™ 28-M resin is totally or partially compatible (in proportions useful in practice) with RS Nitrocellulose, rosin-based resins, alkyds, oils and plasticizers used in lacquers, chlorinated rubber, polyvinyl chloride and ester type waxes. It is partially compatible with ethyl-cellulose and EHEC (Ethyl-Hydroxy-Ethyl-Cellulose), and it is incompatible with cellulose acetate.
This resin is soluble in esters, ketones, and aromatic hydrocarbons, partially soluble in aliphatic solvents and butanol, and is insoluble in ethanol.



Storage

The large contact surface the pieces of resin present make them susceptible to gradual oxidation, which can be more advanced in some batches than others. This can cause darkening and/or affect the resin’s solubility in organic solvents and compatibility with polymers. Therefore, we strongly recommend keeping strict control of inventories at all times, and taking special care to ensure that the oldest material is used first. We suggest a shelf life of 6 months for this product.




Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.