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US 10,655,025 B2Granted
Curable unsaturated crystalline polyester powder and methods of making the same
AssigneeXerox Corporation
InventorsValerie M. Farrugia, Michael S. Hawkins, Guerino G. Sacripante, Edward G. Zwartz
Life of this patent
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Abstract
A process for producing unsaturated polyester microparticles comprising: melt-mixing an unsaturated polyester and an oil in an extruder; washing the microparticles with an organic solvent to reduce the amount of oil; and removing the organic solvent to form the microparticles.
Claims9
A process for making a composition comprising:
- providing an unsaturated polyester resin comprising:
- an ethylenically unsaturated monomer having the formula I
- wherein p and q are each independently 0 to 8, and z is 1 to 5,
- a first diol monomer;
- and
- a second diol monomer;
- mixing and heating a mixture comprising the unsaturated polyester resin and an oil at a temperature above the melting point temperature (Tm) of the unsaturated polyester resin, and applying a pressure to the mixture to form a microparticle composite;
- washing the microparticle composite with an organic solvent to reduce the amount of oil present in the microparticle composite;
- adding a thermal initiator to the microparticle composite;
- and
- removing the organic solvent to form the composition comprising microparticles with the thermal initiator on the surface of the microparticles.
8 more elements
Dependencies are inferred from the claim text.