Polyvinyl acetal microparticles for water-based dispersion
AssigneeSekisui Chemical Co., Ltd.
InventorYasuharu Nagai
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Abstract
The present invention provides polyvinyl acetal fine particles for an aqueous dispersion which exhibit excellent dispersion stability in a water-containing dispersion medium, and allow for formation of a film having sufficient mechanical strength and flexibility without voids and non-uniform structures such as irregularities, and an aqueous dispersion of the polyvinyl acetal fine particles for an aqueous dispersion. The polyvinyl acetal fine particles for an aqueous dispersion, adapted for use as dispersoids in an aqueous dispersion, the polyvinyl acetal fine particles including a polyvinyl acetal resin with an ionic functional group, and having a volume average particle size of 10 nm to 100 μm, and a CV value of a volume-based particle size distribution of at most 40%.
Claims5
Polyvinyl acetal fine particles adapted for use as dispersoids in an aqueous dispersion,
- the polyvinyl acetal fine particles including a polyvinyl acetal resin with an ionic functional group, and having a volume average particle size of 10 nm to 100 μm, and a CV value of a volume-based particle size distribution of at most 40%,
- wherein the polyvinyl acetal resin has a total degree of acetalization of 40 to 80 mol % and comprises a structure unit of the following formula (1):
- wherein C is the carbon atom in the polymer main chain, R1 is a hydrogen atom, R2 is a methylene group, and R3 is a sulfonic acid group or a salt of a sulfonic acid group.
Dependencies are inferred from the claim text.