Rosin physical properties

Rosin ester resins are used as modifiers in the formulation of chewing gum. The rosin derivative modifies the physical properties of the polymer used, providing the desired masticatory properties. The glycerol ester of hydrogenated rosin is the predominant choice, because stabilized materials have improved aging resistance, which extends the shelf life of the gum. 

For computations the physical properties are assumed to be constant. Particle sizes are discretized by 10 equal-weight cuts from the Rosin-Rammler distribution... 

Furan n. Furfuran oxole tetrole divinylene oxide, C4H4O, Molecular Weight 68.07. Occurs in oils obtained by the distillation of rosin contg pine wood. Prepared by decarboxylation of 2-furancarboxylic acid. Furan has been prepared directly from furfural over hot soda-lime or by dropping furfural on a fused mixture of sodium and potassium hydroxides. Other physical properties Liquid. d4 0.9371. bpy o 31.36° bp758 32°. 1.4216. Flash pt,... 

The international market of gum resin is quite variable, affecting the trade values of turpentine and rosin. Besides international standards usually required (particular chemical composition of turpentine, and specific physical properties of rosin, [76]), the prices of gum resin exported (and its by-products) may be subject to negotiation, depending on the type of customer (end user or fractionator) and the amount of tons purchased. For instance, in 2008, the average value of turpentine exported from Brazil was US 1,023.46/t Free on Board (FOB) however, the charged prices for France (the main customer of Brazilian turpentine, Table 136.2) and Spain (which acquired 584,600 kg in 2008) were US 848.85A FOB and US 1,169.88/t FOB, respectively [131]. 

The discovery in 1807 that water resistance in paper could be achieved by precipitating partially saponified rosin with alum on pulp led to a market that has been the major use of rosin for many years. In addition to the simple aqueous dispersion of sodium resinate, called paste size, rosin sizes in emulsion and dry form are also used. The composition of the rosin, the amount of neutrals and oxidized components as well as the resin acid composion, affects the efficacy and physical properties of a size. The efficiency of rosin sizes is improved by fortifica-... 

Rosin-maleic anhydride imidodicarboxylic acid is soluble in chloroform, methyl ethyl ketone, m-cresol and other polar solvents and insoluble in methanol, hexane, chlorobenzene. The physical properties of RMID have been reported earlier. ... 

Tackifiers. Although SBRs can be produced with tack, the physical properties of such polymers usually do not fully satisfy the application requirements. For this reason tackifying resins are normally incorporated into adhesives based on SBRs. These resins improve the kinetics of wetting and increase the overall Tg of the adhesive composition. Typical tackifiers for SBR are rosin-based materials, aromatic-containing petroleum hydrocarbon resins, alpha-pinene, coumarone-indene, and some phenolic resins. 

Although unmodified rosin has some application in low quality mastics and construction adhesives, rosin is typically modified to enhance its oxidative and thermal stability and to obtain a range of physical properties such as softening point and melt viscosity. Rosin is a complex mixture of tricyclic unsaturated resin acids with some nonacidic components. At least... 

A pre-print corrugated ink is composed of a styrene acrylic emulsion colloid vehi-de and a rosin fumarate ester resin and/or styrene acrylic resin solution vehide. The physical properties of emulsions and resins used in pre-print corrugated ink are listed in Tabs 5.4 and 5.5 for. 

Additives. There are many types of additives used by the papermaker to modify the physical and optical properties of the sheet. The most commonly used include kaolin and titanium dioxide for optical properties, starch for strength and rosin sizes for water repellency. All these materials can affect the electrical properties of the paper since they can eventually modify the nature of the interfiber contact as well as the fiber itself. These changes can influence the flow of charge through the sheet. 

Rosin, reclaimed n. Rosin that has been recovered or reclaimed by any means from waste or deteriorated material, provided that the concentration of rosin acids is not below that normal for rosin, and any residual or contaminating component from the waste material itself or from any article used in the recovery process is not in sufficient quantity to cause the physical or chemical properties of the reclaimed product to differ materially from those of rosin. 

Tall oil rosin n. Rosin remaining after the removal of substantially all of the fatty acids from tall oil by fractional distillation or other suitable means. Such rosin shall have the characteristic form, appearance and other physical and chemical properties normal for other kinds of rosins. The fatty acid content shall not exceed 5%. 

---