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US 8,998,400 B2Granted
Copolymer, aqueous ink, and ink cartridge
AssigneeRicoh Company, Ltd.
InventorsShigeyuki Harada, Tamotsu Aruga, Hiroshi Gotou, Hidetoshi Fujii
Life of this patent
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Abstract
A copolymer contains repeating units represented by the following chemical formulae 1 and 2: In the chemical formulae 1 and 2, R represents a hydrogen atom or a cation; X represents an alkylene group having 2 to 18 carbon atoms; Y represents a single bond, an oxycarbonyl group [(X)—O—CO—(Z)], a carbonyloxy group [(X)—CO—O—(Z)], an ether group (—O—), or an imido group [(X)—N—CO—(—CO—)(Z)]; and Z represents a biphenyl group or a naphthyl group).
Claims8
A copolymer comprising:
- repeating units represented by the following chemical formulae 1 and 2:
- where R represents a hydrogen atom or a cation;
- X represents an alkylene group having 2 to 18 carbon atoms;
- Y represents a single bond, an oxycarbonyl group [(X)—O—CO—(Z)], a carbonyloxy group [(X)—CO—O—(Z)], an ether group (—O—), or an imido group [(X)—N—CO—(—CO—)(Z)];
- and Z represents a biphenyl group or a naphthyl group).
2 more elements
Dependencies are inferred from the claim text.