Thermally foamable microsphere and production process thereof

Details Thermally foamable microsphere and production process thereof Thermally foamable microsphere and production process thereof

2007-06-19

2007-06-19

Mulcahy, Peter D. (Department: 1713)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C521S056000, C523S210000

Reexamination Certificate

active

10258790

ABSTRACT:
The invention provides a thermally foamable micro-sphere whose shell is formed of a polymer that is obtained by the polymerization of a polymerizable monomer and a crosslinkable monomer at a proportion of greater than 1% by weight up to 5% by weight based on the polymerizable monomer and which has a maximum expansion ratio of at least 5. The invention also provides a process for the production of a thermally foamable microsphere having a maximum expansion ratio of at least 5 by the suspension polymerization of a polymerizable mixture containing a crosslinkable monomer at a proportion of greater than 1% by weight up to 5% by weight based on the polymerizable monomer.

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