Polyvinyl alcohol-modified rosin-based emulsion polymers
AssigneeWestvaco Corporation
InventorsG. Frederick Hutter, Paul J. Zuraw
Life of this patent
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Abstract
The invention relates to polyvinyl alcohol-modified, rosin-based, resin-fortified emulsion polymer compositions having improved properties which are useful in formulating gravure and flexographic printing inks. Additionally, the invention relates to the method of preparing these emulsion polymer compositions.
Claims21
An improved method for the production of an aqueous polymer emulsion product having a pH value in the range of 7.5 to 10.0, which comprises reacting in an esterification reaction:
- (A) 60.0 to 98.0% by weight of a member selected from the group consisting of fumarated rosin, maleated rosin, and combinations thereof, and
- (B) 2.0 to 40.0% by weight of a polyol to produce a rosin-based support resin having an acid number in the range of 120 to 250;
- and further reacting in a polymerization reaction:
- (1) 0.2 to 2.0% by weight of the total composition of an initiator;
- (2) 1.0 to 12.0% by weight of the total composition of a surfactant;
- (3) 46.0 to 93.8% by weight of the total composition of a monomer;
- (4) 4.9 to 32.0% by weight of the total composition of said support resin;
- and wherein the improvement comprises also reacting in the polymerization reaction from
- (5) 0.1 to 8.0% by weight of the total composition of a polyvinyl alcohol having a molecular weight average in the range of about 10,000 to about 120,000, and a degree of hydrolysis based on mole % of between 80 and 100%, to produce the aqueous polymer emulsion product.
The method of claim I wherein the initiator is selected from the group consisting of ammonium persulfate, potassium persulfate, sodium persulfate, and combinations thereof.
An improved method for the production of an aqueous polymer emulsion product having pH values in the range of 7.5 to 10.0, which comprises reacting in an esterification reaction:
- (A) 60.0 to 98.0% by weight of a member selected from the group consisting of fumarated rosin, maleated rosin, and combinations thereof, and
- (B) 2.0 to 40.0% by weight of a polyol to produce a rosin-based support resin having an acid number in the range of 120 to 250;
- and further reacting in a polymerization reaction:
- (1) 0.2 to 2.0% by weight of the total composition of an initiator;
- (2) 1.0 to 12.0% by weight Of the total composition of a surfactant;
- (3) 31.0 to 93.3% by weight of the total composition of a non amide-containing monomer;
- (4) 0.5 to 15.0% by weight of the total composition of an amide-containing monomer selected from the group consisting of monomers of the formula
- CH.sub.2 .dbd.C(R.sup.1)CON(R.sup.2)(R.sup.3)
- where R.sup.1 is hydrogen or a methyl group, R.sup.2 is hydrogen or a methyl group, and R.sup.3 is hydrogen or an alkyl, hydroxyalkyl, alkoxyalkyl, ketoalkyl, or aryl group containing from 1 to 18 carbon atoms, monomers of the formula ##STR2## where n is 3, 4, or 5, and combinations thereof;
- (5) 4.9 to 32.0% by weight of the total composition of said support resin;
- and wherein the improvement comprises also reacting in the polymerization reaction from
- (6) 0.1 to 8.0% by weight of the total composition of a polyvinyl alcohol having a molecular weight average in the range of about 10,000 to about 120,000, and a degree of hydrolysis based on the mole % of between 80 and 100%, to produce the aqueous polymer emulsion product.
Dependencies are inferred from the claim text.