Environmentally friendly natural oil-based toner resin

Details Environmentally friendly natural oil-based toner resin Environmentally friendly natural oil-based toner resin

2011-06-28

2011-06-28

Wu, David (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S123000, C525S165000, C525S174000, C525S418000, C525S419000, C525S437000, C525S440010, C525S440160, C525S445000

Reexamination Certificate

active

07968647

ABSTRACT:
A method of synthesizing polyester toner resins comprises: polycondensing polycarboxylic acids, polyols and free fatty acids to form low molecular weight polyester resins with alkenyl group or hydroxyl group or a combination of both; wherein at least one of said polycarboxylic acids, said polyols or said free fatty acids derive from natural oils; crosslinking the polyester via alkenyl group with radical initiator and vinyl monomer or via hydroxyl group with diisocyanate to generate polyester of higher molecular weight and melting point; obtaining a first fraction with a molecular weight ranged between 3000 and 15000 and a second fraction with a molecular weight larger than 15000; and combining said first fraction with said second fraction to form said polyester toner resins.

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