Wrinkled polyester particles

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter

Reexamination Certificate

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Details

C428S032320

Reexamination Certificate

active

07128972

ABSTRACT:
The present invention comprises wrinkled polymer particle comprising a polyester-containing particle having a surface covered with at least one wrinkle comprising folds, ridges, crevices and channels. The present invention further comprises a method of forming wrinkled polyester-containing particles comprising preparing a mixture of an organic phase and an aqueous phase, said mixture comprising an unsaturated precursor polyester, a water immiscible organic solvent, at least one organic-soluble ethylenically unsaturated monomer, and initiator, subjecting said mixture to high energy emulsification, initiating crosslinking of said polyester after emulsification, and removing said water immiscible organic solvent to recover wrinkled polyester-containing particles.

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patent: 5559202 (1996-09-01), Yoshikawa
patent: 5604076 (1997-02-01), Patel et al.
patent: 5698292 (1997-12-01), Richart et al.
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patent: 0 467 528 (1992-01-01), None
patent: 1 336 638 (2003-08-01), None
patent: WO 92/16565 (1992-10-01), None
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JP 06 313021 A—Japanese Abstract, Nov. 8, 1994.
Sumalee Tawonsree et al, Journal of Polymer Science: Part A: Polymer Chemistry, vol. 38, 2000, pp. 4038-4056.

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