MINUTE COMPOSITE FLUORORESIN PARTICLE.

摘要

A minute composite fluororesin particle having a multilayered or inclined structure and a mean particle diameter of 0.05-1.0 mu m and composed of a core and a shell, wherein the core comprises a perfluororesin which is prepared by emulsion polymerization, has a monomer composition substantially composed of 85-100 wt.% of tetrafluoroethylene and 0-15 wt.% of a fluoroolefin copolymerizable therewith, is crystalline and has a melting point of 250 DEG C or above, while the shell comprises a vinylidene fluoride resin which is substantially composed of 30-100 mol% of vinylidene fluoride and 0-70 mol% of another fluoroolefin copolymerizable therewith (except for hexafluoroisobutene), is crystalline and has a melting point of 70 DEG C or above. This particle is excellent in the blendability with other resins and elastomers and the dispersibility in coating materials.