Thermo-expansive microspheres, their production process and...

Details Thermo-expansive microspheres, their production process and... Thermo-expansive microspheres, their production process and...

2011-08-09

2011-08-09

Zemel, Irina S (Department: 1765)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S057000, C521S076000, C521S088000, C521S142000, C521S146000

Reexamination Certificate

active

07994229

ABSTRACT:
The present invention provides a process for producing thermo-expansive microspheres comprising a thermoplastic resinous shell and a blowing agent being encapsulated in the shell, the blowing agent which is a fluorine-containing C2-10compound having ether linkage, being free of chlorine and bromine atoms and gasifying at a temperature not higher than the softening point of the thermoplastic resin. The thermo-expansive microspheres have preferably an average particle size ranging from 1 to 100 μm and a CV, or coefficient of variation, of particle size distribution being 30% or less, and a retaining ratio of blowing agent encapsulated being 90% or more.

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Office Action issued in corresponding Korean application No. 10-2004-7014616 dated Jan. 20, 2010.

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