According to incomplete statistics, as of September 2010, the global propylene glycol (PG) of the total capacity of about 2.1 million tons / year of propylene glycol polyester resin, in 2005 this figure was only 1.43 million tons of propylene glycol prices, the growth rate is very fast. One of the biggest manufacturers of Dow, about one third of total production, followed by 24% for Leander. Propylene glycol manufacturer mainly in North America, the annual output of 610,000 tons, followed by Europe glycol, the annual output of 540,000 tons. In Asia, mainly Japan, South Korea and Singapore, which is the domestic propylene glycol export more of these areas: unsaturated polyester due to the different materials used, a lot of variety. Commonly used in the industrial production of unsaturated dicarboxylic acid or anhydride has a maleic anhydride, fumaric acid and tetrahydrophthalic acid anhydride. Commonly used as a saturated dibasic acid or anhydride phthalic anhydride, isophthalic acid and adipic acid. Most used is propylene glycol, diethylene glycol and diethylene glycol. As a crosslinking agent vinyl monomer are styrene, methyl methacrylate, and diallyl phthalate. In addition to these several main raw material, and various additives and a polymerization inhibitor, catalyst or initiator, accelerator, fillers, dyes and lubricants. The most common unsaturated polyester is synthesized from maleic anhydride, phthalic anhydride and propylene glycol. Propylene glycol manufacturer, propylene glycol, Wei Wei Connaught Chemical provided by Qingdao Sino Chemical Company. Qingdao Wei Connaught Chemical Co. (www.qdweinuo.com) strong, credible, in Qingdao, Shandong and other chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Wei Connaught Chemical and you hand into the brilliant, for a better future!