Aqueous dispersion of multiphase polymer particles
AssigneeRohm and Haas Company
InventorsAndrew Hejl, Ethan C. Glor, lbrahim Eryazici, Brian R. Einsla
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Abstract
The present invention relates to a composition comprising an aqueous dispersion of porous core-shell polymer particles having a water-occluded core containing a core polymer phase comprising structural units of a salt of a carboxylic acid monomer; structural units of n-butyl acrylate or 2-ethyhexyl acrylate, or a combination thereof; and structural units of methyl methacrylate; and a shell comprising one or more acrylate monomers; and styrene. The porous core-shell polymers are useful as a component of a basecoat intermediate layer for a thermosensitive paper article.
Claims8
A composition comprising an aqueous dispersion of porous core-shell polymer particles having:
- a) a water-occluded core containing a core polymer phase comprising 1) from 30 to 55 weight percent structural units of a salt of a carboxylic acid monomer;
- 2) from 4.5 to 55 weight percent structural units of n-butyl acrylate or 2-ethyhexyl acrylate, or a combination thereof;
- and 3) from 4.5 to 55 weight percent structural units of methyl methacrylate;
- and
- b) a shell comprising 1) from 3.4 to 16 weight percent structural units of one or more acrylate monomers selected from the group consisting of ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate;
- and 2) from 80 to 96.4 weight percent structural units of styrene;
- wherein the porous core-shell polymer particles having a number average particle size in the range of from 750 nm to 2 μm.
A composition comprising an aqueous dispersion of porous core-shell polymer particles having:
- a) a water-occluded core containing a core polymer phase comprising, based on the weight of the core polymer phase, 1) from 35 to 45 weight percent structural units of ammonium methacrylate or sodium methacrylate;
- 2) from 12 to 45 weight percent structural units of n-butyl acrylate;
- and 3) from 18 to 45 weight percent structural units of methyl methacrylate;
- wherein at least 95 weight percent of the core polymer phase comprises structural units of ammonium methacrylate or sodium methacrylate, n-butyl acrylate, and methyl methacrylate;
- and
- b) a shell comprising, based on the weight of the shell, 1) from 5 to 15 weight percent structural units of n-butyl acrylate;
- 2) from 85 to 93 weight percent structural units of styrene;
- and
- wherein the porous core-shell polymer particles having a number average particle size in the range of from 1 μm to 2 μm;
- and wherein the weight-to-weight ratio of the core polymer phase to the shell is in the range of from 3.0:1 to 5.0:1.
Dependencies are inferred from the claim text.