Hydrocarbon resins formula

Chemistry of rosin. All three types of rosin consist primarily of C20 mono-carboxylic diterpene resin acids, the most common of which have the molecular formula C20H20O2. In addition, rosins contain small amounts of neutral and other acidic components (e.g. fatty acids in tall oil rosin). The neutral components of rosins are diterpene alcohols, hydrocarbons and aldehydes, and their contents generally vary between 5 and 15 wt%. 

Triacetin resistance is especially critical when filter tips are made in one location, stored, and then shipped to another location. For these operations, polyethylene-based adhesives are used because of their low polarity and therefore excellent resistance to triacetin. Where filter plugs are attached at the same location shortly after production, EVA-based adhesives are suitable and preferred. Both types of adhesives use low odor, clean tackifiers such as hydrogenated hydrocarbons or pure monomer resins (typically a-methylstyrene based). Rosin, rosin esters, and phenol-containing tackifiers are not acceptable. EVA-based adhesives use a higher level of wax (about 1 /3 of the formula) than polyethylene-based adhesives (5-20% wax) due to the lower crystallinity and slower set of EVA vs. PE. Application viscosities are 2000-5000 cP. 

Crude rubber is primarily hydrocarbon in nature. In 1826 English chemist Michael Earaday (1791-1867) analyzed natural rubber and found it to have the empirical (simplest) formula C5H8, along with 2 to 4 percent protein and 1 to 4 percent acetone-soluble materials (resins, fatty acids, and sterols). In 1860 English chemist Charles Hanson Greville Williams (1829-1910) confirmed Earaday s analysis and in 1862 distilled natural rubber to obtain the pure monomer, which he named isoprene. He determined isoprene s vapor density and molecular formula, and he showed that it polymerizes to a rubbery product—an observation that led to the notion that rubber is a linear polymer of isoprene, proposed in 1910 by English chemist Samuel Shrowder Pickles (1878-1962). 

Classification Organic peroxide Empirical C8H18O2 Formula (CH3)3COOC(CH3)3 Properties Clear water-wh. liq. distinctive odor sol. in styrene, ketones, ethanol, most resin monomers, most aliphatic and aromatic hydrocarbons pract. insol. in water m.w. 146.23 dens. 0.791 (25/25 C) vapor pressure 19.51 mm (20 C) f.p. -40 C b.p. Ill C dec. 190C flash... 

The term terpene was given to the compounds isolated from turpentine (Latin balsamum terebinthinae), a volatile liquid isolated from pine trees. Turpentine contains the resin acids and some hydrocarbons, which were referred to as terpenes. The term terpene was originally coined to describe a mixture of isomeric plant hydrocarbons of the molecular formula CioHig occurring in the essential oils. 

The term TR refers to low molecular weight polymers of terpenes, which are hydrocarbons of the general formula CioHig, occurring in most essential oils and oleoresins of plants, and phenol-modified terpene resins. Suitable terpenes include a-pinene, P-pinene, dipentene, limonene, myrcene, bomylene, camphene, and the like. These products occurs as by-products of coking operations of petroleum refining and paper manufacture. 

Terpenic resins are oligomers of some unsaturated dicyclic hydrocarbons with the formula CmHie, which are found in coniferous crude oil, the turpentine resulting from the cellulose-sulfate process, and other natural materials. The main compounds of turpentine-sulfate and of some distillation fractions of this are a- and 3-pinene (Fig. 5). 

---