Rosin Bleaching

Chem. Descrip. Nonylphenol disulfide oligomer Uses Antioxidant tor disproportionation and bleaching rosins and rosin ester, enabling prod, of lighter colored resins for use as adhesive tackitiers and clear coatings (varnishes) decreases tendency of rosins to crystallize improves stability and lightens color of rosin esters Properties Dk. brn. vise, liq. mild sulfur odor sol. in common org. soivs. (methanol, heptane, toluene) sol. < 1% in water sp.gr. 1.03 (15.6 C) vise. 24-34 cSt (100 C) 9.4-10.6% sulfur Ethazate [Uniroyal]... 

Bosin.—Several methods have been suggested for bleaching rosin in some instances the constitution of the rosin is altered, and in others the cost is too great or the process impracticable. 

These rosin-based sizes, whether paste, Hquid, or emulsions, can be used to size all grades of paper that are produced at acid pH. The latter include bleached or unbleached kraft Hnerboard and bag paper, bleached printing and writing grades, and cylinder board. In addition, polyaluminum compounds have been used in place of alum, most notably, polyaluminum chloride (48), which can reduce barium deposits where these have been a problem. The barium chloride by-product is more water-soluble than barium sulfate. Other polyaluminum compounds such as polyhydroxylated forms of alum and polyaluminum siHcosulfate have been evaluated as alum replacements. 

Materials. All paper samples were cut from a continuous length of machine-made rolls. Two different papers have been studied. One is a bleached Kraft wood pulp waterleaf (50-lb basis weight) made by Neenah Paper Mills from a stock that comprised northern softwoods (60Z) and Lake States hard woods (40J), and contained no additives. The second paper, Foldur Kraft, is a bleached Kraft paper (70-lb basis weight) made by Champion Paper Company from a stock of 90Z softwoods and 10Z hardwoods, with alum-rosin size and 8Z titanium dioxide filler. This paper was obtained 15 years ago. Since then it has been stored indoors in areas which have not enjoyed a carefully regulated environmental control. 

Commercial offset 30% bleached southern kraft 70% hardwood soda 6.1 15 parts clay rosin starch... 

Laboratory handmade ° Modified rosin. 33.3% refined rag 33.3%bleached kraft 33.3% bleached sulfite 5.3 1% Neuphor 3% alum... 

Sample Preparation. Two papers were selected. One was Champion Foldur Kraft, a bleached southern kraft paper, containing rosin size and fillers, from a single roll of known composition. The other paper was newsprint that had already been cut into sheets when received by the laboratory. The newsprint was analyzed as follows 80% groundwood and 20% unbleached sulfite. 

Materials. All test papers were obtained from a single roll or were made from pulp. The following test papers were used (1) Foldur kraft paper, a bleached kraft paper made from 90% southern pine and 10% hardwood pulps, with 0.5% rosin size and 3% titanium filler (2) newsprint paper made from 80% groundwood and 20% unbleached sulfite pulp and (3) handsheets prepared from a 1 1 furnish of Weyerhaeuser New Bern softwood (NBS) and New Bern hardwood (NBH) bleached kraft pulps. 

Pine (Pinus palustris) tar Rosinal 18 Rosintene 653 Tartac 20 Tartac 30 Tartac 40 232-383-7 Atowax Beeswax Beeswax SP 6 Beeswax SP 11 Beeswax SP 44 Beeswax SP 45 Beeswax SP 139W Beeswax SP 139Y Beeswax SP 154 ISO Beeswax Beeswax SP 420 Beeswax SP 422 Beeswax SP 424 Beeswax SP 426 Beeswax Commercial SP 1142 Beeswax Semi Bleached SP 752 Beeswax, white Beeswax White Refined SP 44 Beeswax White SP 52 Beeswax White Stralpitz Beeswax, yellow Beeswax Yellow Refined SP 6 Cerabeil White DAB Cerabeil White Selection Cerabeil Yellow Selection Ceraxoline T254... 

Figure 7.21. Retention of rosin precipitate (Hab) on bleached kraft pulp as a function of pH in deionized water with different additions of aluminium sulfate. (Redrawn from ref. (23))...

Aniline-furfural resin n. Furfural yields resinous compounds not only with aniline but with aromatic amines generally. Rosin modified resins have also been produced. Amine-fiirfural resins are dark in color. Bleaching occurs on exposed to light. They possess the unique property of compatibility with cellulose acetate. 

The materials employed in making mottled soap comprise bleached palm oil, tallow, bone fat, cocoa-nut oil, palm-kernel oil, cotton-seed oil, and, in some instances, rosin. 

Another operation in which soap is used, is that of milling or fulling, whereby the fabric is made to shrink and thus becomes more compact and closer in texture. The fabric is thoroughly cleansed, for which purpose the soap should be neutral and free from rosin and silicates, otherwise a harsh feeling or stickiness will be produced. Curd soaps or finely-fitted soaps made from tallow or bleached palm oil, with or without the addition of cocoa-nut oil, give the best results. All traces of soap must be carefully removed if the fabric is to be dyed. 

Bleaching and Treatment op Raw Materials intended for SoAP-MAKiNra Palm Oil—Cotton-seed Oil—Cotton-seed Foots —Vegetable Oils— Animal Fats—Bone Fat—Rosin. 

Uses Dye fixing agent for paper industry dispersant for dyes in papennaking stabilizer for rosin size emulsions in papermaking Features Water-based dye is retained even by bleached fibrous material with good yield... 

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