Abstract: Phosphoramidite compounds of the general formula ##STR1## wherein each of R.sub.1 and R.sub.2 represents a hydroxyl group having a protective group, or the group --OR.sub.4, R.sub.3 represents a hydrogen atom, a hydroxyl group having a protective group, or the group --OR.sub.4, R.sub.4 represents the group ##STR2## X represents a secondary amino group, R.sub.5 represents an allylic residue or a protective group capable of being split off by beta-cleavage, and B.sup.AOC represents a nucleoside base residue in which the amino or imino group is protected with an allyloxycarbonyl-type residue, with the proviso that only one of R.sub.1, R.sub.2 and R.sub.3 represents the group--OR.sub.4. The compounds can be produced by reacting a nucleoside represented by the general formula ##STR3## wherein each of R.sub.1 ' and R.sub.2 ' represents a hydroxyl group which may have a protective group, R.sub.3 ' represents a hydrogen atom, or a hydroxyl group which may have a protective group, and B.sup.

Abstract: A process for producing a novel modified resin, which comprises reacting (I) a hydroxyl-containing resin with (II) a polyisocyanate compound, said resin (I) being prepared by reacting (a) the reaction product of a cyclopentadiene resin, a higher fatty acid ester having a conjugated double bond and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride with (b) a hydroxyl group-imparting agent; a modified resin obtained by the aforesaid process; and a printing ink comprising the modified resin as a vehicle component.

Abstract: A process for producing a novel modified resin, which comprises reacting (I) the reaction product of 98 to 35% by weight of a cyclopentadiene resin, 2 to 65% by weight of a higher fatty acid ester having a conjugated double bond and 0 to 30% by weight of an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, with (II) at least one vinyl monomer selected from the group consisting of vinyl aromatic compounds and unsaturated monocarboxylic acid esters; and a vehicle component composition for printing inks comprising the aforesaid modified resin.

Abstract: A process for producing an oil-modified resin having a softening point of 40.degree. to 200.degree. C., which comprises reacting [A] an acid-modified cyclopentadiene resin having an acid value of 0.1 to 100 in the presence of [C] at least one metal compound selected from the group consisting of polyvalent metal alcoholates and chelate compounds thereof with [B] an oily modifier containing at least 4 carbon atoms and having a functional group capable of reacting with the metal compound [C], said acid-modified cyclopentadiene resin being selected from the group consisting of (i) the reaction product of 100 parts by weight of a cyclopentadiene resin free from a carboxyl or acid anhydride group, 0 to 200 parts by weight of a higher fatty acid ester containing a conjugated double bond and 0.2 to 50 parts by weight of an .alpha.,.beta.

Abstract: A process for producing a novel modified resin, which comprises reacting (I) the reaction product of (a) an adduct of a cyclopentadiene resin with an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, with (b) an adduct of a higher fatty acid ester having a conjugated double bond with an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, with (II) a polyamine having at least two primary or secondary amino groups; and a vehicle component composition for printing inks comprising the aforesaid modified resin.

Abstract: A process for preparing novel modified resins comprising heating and reacting an addition product (A) of a cyclopentadiene resin and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride with an addition product (B) of a higher aliphatic ester having a conjugated double bond and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride, in an inert gas atmosphere in the presence or absence of a metal compound; andA novel composition for printing inks comprising, as a vehicle component, a modified resin obtained by the reaction of 95 to 40% by weight of an addition product (A) of a cyclopentadiene resin and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride with 5 to 60% by weight of an addition product (B) of a higher aliphatic ester having a conjugated double bond and an .alpha.,.beta.-unsaturated dicarboxylic acid, in an inert gas atmosphere.