Hollow polymer particles having at least two polymer layers, wherein (1) the particles have an average particle diameter in the range of 0.15 to 20 micrometers, (2) each of the particles has an average equivalent hollow diameter/equivalent particle diameter in the range of 0.2 to 0.8, (3) the propor
Hollow polymer particles having at least two polymer layers, wherein (1) the particles have an average particle diameter in the range of 0.15 to 20 micrometers, (2) each of the particles has an average equivalent hollow diameter/equivalent particle diameter in the range of 0.2 to 0.8, (3) the proportion of a toluene-insoluble portion of the particles is 20 to 90% by weight, (4) the polymer particles have a melt flow rate at 180°C. under 10 kgf/cm2 of 0.1 to 1 g/10 min., (5) the inside layer of the two polymer layers is composed of a crosslinked polymer and (6) the outside layer of the two polymer layers is composd of a non-crosslinked polymer. This invention also provides hollow crosslinked polymer particles wherein the proportion of a toluene-insoluble portion of the particles exceeds 85% by weight, the melt flow rate of the polymer particles at 180°C. under 10 kgf/cm2 is less than 0.2 g/10 min., and the outside layer is composed of a crosslinked polymer. The hollow polymer particles are useful, for example, as a pigment, and for a paper coating composition and a general-purpose coating composition.
대표청구항▼
Hollow polymer particles having at least two polymer layers, wherein (1) the particles have an average particle diameter in the range of 0.15 to 20 micrometers, (2) each of the particles has an average equivalent hollow diameter/equivalent particle diameter in the range of 0.2 to 0.8, (3) the propo
Hollow polymer particles having at least two polymer layers, wherein (1) the particles have an average particle diameter in the range of 0.15 to 20 micrometers, (2) each of the particles has an average equivalent hollow diameter/equivalent particle diameter in the range of 0.2 to 0.8, (3) the proportion of a toluene-insoluble portion of the particles is 20 to 90% by weight, (4) the polymer particles have a melt flow rate at 180°C. under 10 kgf/cm2 of 0.1 to 1 g/10 min., (5) the inside layer of the two polymer layers is composed of a crosslinked polymer composed of (a) recurring units represented by the following formula [Figure] (a) wherein R1 represents a hydrogen atom or a methyl group, X represents an n-functional organic group or a bond, and n is a number of 2 or 3, provided that n R1\s may be identical or different and when X is a bond, n is 2, l (b) recurring units represented by the following formula [Figure] (b) wherein R2 represents a hydrogen atom or a methyl group, and Y represents a phenyl group, a phenyl group substituted by halo, alkyl or vinyl, a halogen atom, a cyano group, an alkanoyloxy group having 1 to 18 carbon atoms, an alkoxy group, a pyridyl group, a pyridylalkyl group, an aminoalkoxy group or an amide group, (c) recurring units represented by the following formula [Figure] (c) wherein R3 and R5 are identical or different, and each represents a hydrogen atom or a methyl group, R4 represents a hydrogen atom, a carboxyl group or a carboxylate group, and R6 represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a hydroxyalkyl group having 2 to 10 carbon atoms, an organic group containing at least one member selected from a glycidyl group, an amino group, a cyano group and a carbon-carbon double bond, or one equivalent of a cation group, and (d) optionally, recurring units represented by the following formula [Figure] (d) wherein R7 represents a hydrogen atom or a methyl group, and (6) the outside layer of the two polymer layers is composed of a non-crosslinked polymer composed of at least one type of recurring units selected from the recurring units of formulae (b), (c) and (d).
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