| 摘要 |
<p>An aqueous pigment dispersion comprising carbon black pigment having a pH < 7 and an AB block copolymer pigment dispersant consists of an A segment of polymerized aryl (meth)acrylate and alkyl amino alkyl (meth)acrylate and the B segment consists of polymerized alkyl (meth)acrylate having 1-12 carbon atoms in the alkyl group, hydroxy alkyl (meth)acrylate having 1-4 carbon atoms in the alkyl group and acrylic acid or methacrylic acid,
wherein the AB block copolymer has a number average molecular weight of 5,000 - 20,000 and consists of 20-80% by weight of a polymeric A segment and correspondingly 80-20% by weight of a polymeric B segment; and
wherein the weight ratio of pigment to dispersant ratio is 0.1/1 - 20/1, and a process for forming the dispersions.</p> |
