Unfortified liquid paper sizing composition and method of preparation
AssigneeMonsanto Company
InventorsSteven Abell, Thomas L. Peltier
Life of this patent
Estimating the term…
Abstract
A tall oil rosin paper sizing composition comprising a homogeneous aqueous liquid which is fully miscible with water at 5.degree. C. On a solids basis, the composition contains between about 15% and about 75% by weight of an alkali metal soap of a condensation product of tall oil rosin and an aldehyde, and between about 85% and about 25% by weight urea. Also disclosed are methods for preparation and use of the novel paper sizing composition.
Claims23
A rosin paper sizing composition comprising a homogeneous aqueous liquid which is fully miscible with water at 5.degree. C., on a solids basis said composition containing between about 15% and about 75% by weight of an alkali metal soap of a condensation product of rosin and aldehyde, and between about 85% and 25% by weight urea.
A tall oil rosin paper sizing composition comprising a homogeneous aqueous liquid which is fully miscible with water at 5.degree. C., with an acid number from about -5 to about 5, with a viscosity not greater than 1000 cp at 25.degree. C., comprising, on a 100% basis:
- a. at least about 40% by weight water;
- b. from about 25% to about 40% by weight of a potassium soap of a condensation product of tall oil rosin and formaldehyde;
- and
- c. from about 10% to about 40% by weight of urea.
A process for the preparation of a liquid paper sizing composition comprising the steps of:
- a. reacting molten rosin with an aldehyde in the presence of an acid catalyst to produce a condensation product of the rosin and the aldehyde;
- b. saponifying said condensation product with an alkali metal base to produce an aqueous mixture comprising the saponified condensation product;
- and
- c. adding urea to said mixture in a proportion sufficient to enhance the water solubility and stability of the mixture.
A process for the preparation of a liquid paper sizing composition, comprising the steps of:
- a. reacting molten tall oil rosin with from about 0.4 to about 0.8 moles of formaldehyde per mole of rosin acid, to produce a condensation product;
- b. saponifying said condensation product with a alkali metal base comprising at least about 95% potassium base, to product an aqueous mixture containing the saponified condensation product, and
- c. thereafter, adding urea in a proportion sufficient to produce a homogeneous liquid which is fully miscible with water at 5.degree. C.
A tall oil rosin paper sizing composition comprising a homogeneous aqueous liquid which is fully miscible with water at 5.degree. C., said composition being produced by the process comprising:
- a. reacting molten tall oil rosin with an aldehyde in the presence of an acid catalyst to produce a condensation product of the rosin and the aldehyde;
- b. saponifying said condensation product with an alkali metal base to produce an aqueous mixture comprising the saponified condensation product;
- and
- c. adding urea to said mixture in a proportion sufficient to enhance the solubility of the saponified condensation product in said mixture.
A method for sizing paper comprising introducing into an aqueous suspension of pulp, a tall oil rosin based sizing agent and sulfate alum to dcposit said sizing agent on the surfaces of the pulp fibers, said sizing agent comprising a homogeneous aqueous liquid which is fully miscible with water at 5.degree. C., on a solids basis said composition containing between about 15% and about 75% by weight of an alkali metal soap of a condensation product of tall oil rosin and an aldehyde, and between about 85% and 25% by weight urea.
Dependencies are inferred from the claim text.