Pigment dispersant
First Claim
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1. A nanoparticulate dispersion comprising:
- a) pigment particles having an average primary particle size of less than one micron; and
b) a dispersant comprising a tri-block copolymer prepared by controlled radical polymerization and represented by the following formula,
φ
-(G)p-(W)q-(Y)s-Twherein φ
is a hydrophobic residue of or derived from a monomeric initiator, and is free of a radically transferable group,G is a hydrophobic residue of an oxirane functional monomer reacted with a carboxylic acid,W is a residue of (meth)acrylic acid alkyl esters, and -(W)q- defines a W-block,Y is a residue of (meth)acrylic acid alkyl esters, and -(Y)s- defines a Y-block, wherein said W-block is different from said Y-block,T is or is derived from the radically transferable group of said monomeric initiator, andp, q, and s are each independently at least 1.
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Abstract
A pigment dispersant is disclosed comprising a tri-block copolymer having a first block comprising a glycidyl(meth)acrylate reacted with a napthoic acid, a second block comprising (meth)acrylic acid alkyl esters, and a third block comprising (meth)acrylic acid alkyl esters, wherein said third block is different from said second block. The dispersant is suited for use in a nanoparticulate dispersion comprising pigment particles having an average primary particle size of less than 100 nm.
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Citations
22 Claims
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1. A nanoparticulate dispersion comprising:
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a) pigment particles having an average primary particle size of less than one micron; and b) a dispersant comprising a tri-block copolymer prepared by controlled radical polymerization and represented by the following formula,
φ
-(G)p-(W)q-(Y)s-Twherein φ
is a hydrophobic residue of or derived from a monomeric initiator, and is free of a radically transferable group,G is a hydrophobic residue of an oxirane functional monomer reacted with a carboxylic acid, W is a residue of (meth)acrylic acid alkyl esters, and -(W)q- defines a W-block, Y is a residue of (meth)acrylic acid alkyl esters, and -(Y)s- defines a Y-block, wherein said W-block is different from said Y-block, T is or is derived from the radically transferable group of said monomeric initiator, and p, q, and s are each independently at least 1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18, 19, 20, 21)
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9. A pigment dispersant comprising a tri-block copolymer prepared by controlled radical polymerization and represented by the following formula,
φ- -(G)p-(W)q-(Y)s-T
wherein φ
is a hydrophobic residue of or derived from a monomeric initiator, and is free of a radically transferable group,G is a hydrophobic residue of a glycidyl(meth)acrylate reacted with a napthoic acid, W is a residue of (meth)acrylic acid alkyl esters, and -(W)q- defines a W-block, Y is a residue of (meth)acrylic acid alkyl esters, and -(Y)s- defines a Y-block, wherein said W-block is different from said Y-block, T is or is derived from the radically transferable group of said momomeric initiator, and p, q, and s are each independently at least 1. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 22)
- -(G)p-(W)q-(Y)s-T
Specification