Rosin thermal stability

Uses Antioxidant, heat stabilizer for syn. rug-backing, latex paints, rosin, ester gums, in gasoline and aviation fuels, insulating oils, paraffin wax Features Primary antioxidant provides better thermal stabilization of polyolefins and lower vapor pressure than common antioxidants Properties Gardner 12 clear liq. sol. in abs. ethanol, benzene, MEK,... 

We have found that RMA appears to be a suitable substitute for TMA as a raw material for polymers. Rosin polymers such as polyeste-rimides via RMA or RMID or its derivative possess similar solubility and other characteristics to those synthesized from TMA. The thermal behavior of a polyesterimide (PEI-2) from rosin has been compared with that of TMA-based polyesterimides (Table 4). It is found from Table 4 that the thermal stability of the polyesterimide from RMA is similar to that of TMA. The glass transition temperature,... 

Hot-melt adhesives are 100% solids that, in the broadest sense, include all thermoplastic polymers. Polymers that are primarily used as hot-melt adhesives include ethylene-vinyl acetate copolymers (EVA), polyvinyl acetates (PVA), polyethylene (PE), amorphous polypropylene, block copolymers (thermoplastic elastomers), polyamides, and polyesters. The oldest hot-melt adhesive, which has been in use since early times, is sealing wax. In principle, glutins and glue jellies also may be regarded as hot-melt adhesives. However, modern hot-melt adhesives are primarily synthetic products. The simplest hot-melt adhesives are rosin-wax mixtures. But these products have limited strength and thermal stability. 

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... 

Rosins - These are abietie aeid resins obtained from wood sourees. There are several different types wood rosins obtained from the naptha extraetion of pine stumps, gum rosins obtained from the destruetive distillation of turpentine, and tall oil rosins obtained by the destruetive steam distillation of tall oil from the manufacture of paper. Rosins are widely used in the adhesive and sealant industry. In hot melts they oxidize and diseolor easily at high temperatures due to the imsaturation in the resin. Hydrogenated grades are available which have much better thermal stability. 

Carbon tetrachloride [56-23-5] (tetrachloromethane), CCl, at ordinary temperature and pressure is a heavy, colorless Hquid with a characteristic nonirritant odor it is nonflammable. Carbon tetrachloride contains 92 wt % chlorine. When in contact with a flame or very hot surface, the vapor decomposes to give toxic products, such as phosgene. It is the most toxic of the chloromethanes and the most unstable upon thermal oxidation. The commercial product frequendy contains added stabilizers. Carbon tetrachloride is miscible with many common organic Hquids and is a powerhil solvent for asphalt, benzyl resin (polymerized benzyl chloride), bitumens, chlorinated mbber, ethylceUulose, fats, gums, rosin, and waxes. 

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