Process for producing oil-modified and rosin-modified phenolic resin for printing inks

A process for producing an animal or vegetable oil-modified and rosin-modified phenolic resin useful in preparing varnishes for printing inks having both high gloss and fast set which comprises reacting

• (a) a resol phenol/formaldehyde initial condensation product comprised predominantly of a compound of the formula (a) ##STR7## wherein R represents a hydrogen atom or an alkyl group, (b) at least one animal or vegetable oil having an iodine value of 100 to 210 or containing an hydroxyl group;
• (c) a rosin, and
• (d) a trihydric aliphatic alcohol or higher aliphatic monohydric alcohol;
• and,
• up to not more than 30 parts by weight per 100 parts by weight of the total resin-forming components of an aliphatic, aromatic or alicyclic resin having a number average molecular weight of about 500 to 5,000 and a softening point of at least 70.degree. C.;
• the amounts of (a) and (b) being, respectively, from about 10 to about 35 parts, and about 5 to about 45 parts, each based on 100 parts by weight of the resin-forming components;
• and the amount of the alcohol (d) providing an equivalent ratio of hydroxyl groups to the total carboxylic acid of from 0.7:1 to 1.3:1;
• said oil-modified and rosin-modified phenolic resin having a softening point of 100.degree. to 150.degree. C. and an acid value of not more than 30 and a number average molecular weight of from about 500 to about 5,000 calculated in terms of polystyrene.

A process for producing an animal or vegetable oil-modified and rosin-modified phenolic resin useful in preparing varnishes for printing inks having both high gloss and fast set which comprises reacting

• (a) a resol phenol/formaldehyde initial condensation product comprised predominantly of a compound of the formula (A) ##STR8## wherein R represents a hydrogen atom or an alkyl group, (b) at least one animal or vegetable oil having an iodine value of 100 to 210 or containing an hydroxyl group;
• (c) a rosin,
• (d) a trihydric aliphatic alcohol or higher aliphatic monohydric alcohol,
• and at least one of the following components (e) and (f):
• (e) a monobasic or polybasic carboxylic acid,
• (f) an aliphatic, aromatic or alicyclic resin having a number average molecular weight of about 500 to 5,000 and a softening point of at least 70.degree. C., the amount of (f) being up to not more than 30 parts by weight per 100 parts by weight of the total resin-forming components;
• the amounts of (a) and (b) being, respectively, from about 10 to about 35 parts, and about 5 to about 45 parts, each based on 100 parts by weight of the resin-forming components;
• and the amount of the alcohol (d) providing an equivalent ratio of hydroxyl groups to the total carboxylic acid of from 0.7:1 to 1.3:1;
• said oil-modified and rosin-modified phenolic resin having a softening point of 100.degree. to 150.degree. C. and an acid value of not more than 30 and a number average molecular weight of from about 500 to about 5,000 calculated in terms of polystyrene.

A process for producing an animal or vegetable oil-modified and rosin-modified phenolic resin for printing inks, which comprises

• (I) reacting (a) a resol phenol/formaldehyde initial condensation product, (b) an animal or vegetable oil having an iodine value of 100 to 210 or containing a hydroxyl group, (c) a rosin and (d) an alcohol;
• or
• (II) reacting the condensation product (a) and the animal or vegetable oil (b) with a rosin ester formed by reacting the rosin (c) and the alcohol (d);
• and further reacting the reaction product (I) or (II) with a carboxylic acid (e) or a hydrocarbon resin (f) selected from the group consisting of aliphatic, aromatic and alicyclic resins having a number average molecular weight of from about 500 to about 5,000 and a softening point of at least 70.degree. C.