| abstract |
(57) Abstract: The invention relates, there average particle size in the range of 1 to 100 [mu] m, the specific surface area measured by adsorption method (S 1) and the measured specific surface area by the light scattering method (S 2 (Meth) acrylic non-crosslinking, wherein the surface roughness coefficient R of the particles represented by the ratio (S 1 / S 2 ) with the ratio (S 1 / S 2 ) satisfies the relational expression of 1.5 ≦ R ≦ 4.5 Polymer particles, especially particles suitable for dental use. Also, The dental adhesive composition of the present invention contains the (meth) acrylic non-crosslinked polymer particles, a (meth) acrylate polymerizable monomer, and a curing agent. The adhesive composition using the particles of the present invention can extend the operable time, which has been difficult to realize in the past, with little effect on the curing speed. |