Polyester Resin Intermediates

    More than half of powder coating processes utilize a polyester resin in the binder system.  Eastman™ provides high-quality polyester resin intermediates that deliver cost effective production and targeted surface finish performance.  Browse their solutions portfolio and learn how and why to select their resin intermediate products. 
     

Powder Coatings - Polyester Resin Powders


Powder coating is becoming increasingly more popular due to a variety of benefits over liquid paint processes and higher expectations from consumers for products that last. Powder coating processes improve overall coating performance, reduce the cost during application and can eliminate all VOC (volatile organic compounds), HAPs (hazardous air pollutants), and hazardous waste generated during application.
For thermoset polyester resin powders, there are two basic categories — hydroxyl and carboxyl terminated.  Each variety of polyester resin uses different types of cross-linkers in composition of the binder system.  A quick table details the combination of polyester resin & cross-linker type:
 
    Polyester Resin TypeMatching Cross-Linker Type
     
    Hydroxyl Terminated

     
    Blocked Isocyanates 
    Tetramethoxymethyl glycoluyril
    (Powderlink™ 1174)
     
    Carboxyl Terminated
     
    Triglycidylisocyanurate (TGIC)
    ß-hydroxylakylamide (Primid™ XL552)
    Epoxy Resins 
The high-quality monomers from Eastman™ Chemical Company allow for optimized polyester resin & powder coating performance.
 

Eastman™ Resin Intermediate Product Portfolio


    GradePhysical FormMolecular WeightMelting Point (°C)Assay Weight (%)
    NPG™ Glycol

    Platelets

    104.15
    127
    99.5
    NPG-90 GlycolSlurry
    104.15
    31b
    89
    CHDM-D90Molten
    144.21
    50
    99.5
    CHDM-DLiquid
    144.21
    -30 to 40c
    90
    HPHP

    Nugget

    204.26
    46 to 50
    98.1
    1,4-CHDAPowder
    172.00
    164 to 167
    99.5
b Crystallizes below 31°C (88°F)
c CHDM-D90 is a CHDM-D/water mixture exhibiting multiple melting points across this range. 

 

    NPG™ Glycol (Neopentyl Glycol)


    • Primary component of most polyester resins for powder coating
    • NPG based resins can be made with a glass transition temp (Tg) of 52°-68°C (125.6°-154.4°F)
    • Low Initial Color & Good Color Stability 
    • Good powder Flow & Fluidization Properties 
    • Good Balance of Hardness & Flexibility 
    • Good Chemical & Stain Resistance

    HPHP (Hydroxypivalyl Hydroxypivalate) 


    • Structural & reactivity properties similar to Eastman NPG™ glycol
    • Resin T is reduced by approx. 0.2°C for every mole% replacement of NPG glycol in a PTA/NPG Resin
    • Excellent Weathering Characteristics - Ideal for Outdoor Applications
    • Improved Smoothness & Flexibility in TGIC and ß-hydroxylakylamide systems  
    • Good Chemical & Stain Resistance

    CHDM (1,4-Cyclohexanedimethanol) 


    • CHDM presents no effect on Tg as it replaces NPG™ glycol in PTA/NPG resin systems
    • T is raised by approx. 0.2°C for every mole% replacement of NPG glycol in a PIA/NPG resin systems
    • Primary alcohol functionality provides good reactivity during synthesis 
    • Superior detergent resistance for appliance & other applications 

    CHDA (1,4-Cyclohexanedicarboxylic Acid) 


    • CHDA has higher solubility and reduced resin cook time 
    • T is reduced by approx. 0.4°C for every mole% replacement of PTA with CHDA in a PTA/NPG resin system
    • Excellent flexibility and hardness  
    • Better smoothness (less orange peel) as CHDA is more efficient at reducing melt viscosity than PTA

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