Lithographic printing ink additive
AssigneeMitsubishi Paper Mills Limited
InventorsToshiro Kondo, Yasuo Tsubai
Life of this patent
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Abstract
This invention provides an ink additive comprising at least one compound selected from a polymer represented by the following formula (I) and a polymer which contains unsubstituted or substituted alkylene oxide unit having a total carbon number of 4 of more and has an average molecular weight of 400 or more. HO--Z--R (I) (wherein Z comprises 4 mols or more of ##STR1## unit and --CH.sub.2 CH.sub.2 O-- and/or ##STR2## or 10 mols or more of only ##STR3## R represents a hydrogen atom or an organic group and average molecular weight of the polymer is 400 or more.)
Claims6
A lithographic printing ink which comprises a pigment, a vehicle and an ink additive which comprises at least one polymer having a mean molecular weight of about 400 to about 8,000 and wherein said at least one polymer is selected from the group consisting of the following polymers (a) and (b):
- (a) a block polymer represented by the following formula (Ia):
- HO--(--EO--).sub.b --(PO).sub.a --(EO).sub.c --R (Ia)
- wherein a represents an integer of 4-60, b and c each represents an integer of more than 1 and EO denotes --CH.sub.2 CH.sub.2 O-- and PO denotes ##STR12## and R is selected from the group consisting of a hydrogen atom, an alkyl group, an aryl group, an alkylcarbonyl group or an arylcarbonyl group;
- and
- (b) a polymer having unsubstituted or substituted alkylene oxide units having at least 4 carbon atoms;
- wherein said printing ink additive is present in an amount from 1 to 10% by weight.
A lithographic printing ink which comprises a pigment, a vehicle and an ink additive which comprises at least one polymer having a mean molecular weight of about 400 to about 8,000 and wherein said at least one polymer is selected from the group consisting of the following polymers (a) and (b):
- (a) a polymer selected from polymers of the formula (Ib) or (Ic):
- HO--(PO).sub.b --(GO).sub.a --(PO).sub.c --R (Ib)
- HO--(EO).sub.d --(PO).sub.b --(GO).sub.a --(PO).sub.c --(EO).sub.e --R(Ic)
- wherein a represents an integer of 1 or more and b, c, d and e each represents an integer of more than 1 and PO denotes ##STR13## and EO denotes --CH.sub.2 CH.sub.2 O-- and GO denotes ##STR14## and R is selected from a hydrogen atom, an alkyl group, an aryl group, an alkylcarbonyl group or an arylcarbonyl group;
- and
- (b) a polymer having unsubstituted or substituted alkylene oxide units having at least four carbon atoms;
- wherein said printing ink additive is present in an amount from 1 to 10% by weight.
A lithographic printing ink which comprises a pigment, a vehicle and an ink additive which comprises at least one polymer having a mean molecular weight of about 400 to about 8,000 and wherein said at least one polymer is selected from the group consisting of the following polymers (a) and (b):
- (a) A polymer represented by the following formula (I):
- HO--Z--R (I)
- wherein Z comprises (1) four moles or more of ##STR15## unit and the balance of at least one unit selected from the group consisting of --CH.sub.2 CH.sub.2 O-- and ##STR16## or (2) 10 moles or more of ##STR17## wherein the propylene oxide unit is present in an amount from 5 to 99% by weight of the polymer, and R represents a hydrogen atom, an alkyl group, an aryl group, and alkylcarbonyl group or an arylcarbonyl group, and `(b) a polymer selected from the group consisting of an unsubstituted alkylene oxide of 4-12 carbon atoms or an alkylene oxide of 2-12 carbon atoms substituted with a lower alkyl group, a substituted alkyl group or an aryl group;
- wherein said printing ink additive is present in an amount from 1 to 10% by weight.
Dependencies are inferred from the claim text.