Processes for preparing impact modifier powders

Details Processes for preparing impact modifier powders Processes for preparing impact modifier powders

2005-05-31

2005-05-31

Cain, Edward J. (Department: 1714)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C523S220000

Reexamination Certificate

active

06900254

ABSTRACT:
Processes for preparing a powdery high rubber impact modifier containing two or more populations of polymer particles having a total rubbery weight fraction of greater than 90 weight percent is provided. Also provided are various methods of preparing aqueous polymer particle dispersions having two or more populations of polymer particles having a total rubbery weight fraction of greater than 90 weight percent. These dispersions are spray-driable into a powder and are useful for increasing the impact strength of various matrix resins.

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Kuo-Chen Li et al.; “Thermal Stimulated Current Study of Core-Shell Impact Modifier/PVC Blends”; Rapra Abstracts, Pergamon Press Ltd. Oxford, GB vol. 34, No. 8, Aug. 1, 1997, p. 96—XP000698992.

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