Low viscosity unsaturated polyester resins

Details Low viscosity unsaturated polyester resins Low viscosity unsaturated polyester resins

C - Chemistry, Metallurgy

08

G

400/5757

C08G 63/54 (2006.01) C08G 63/676 (2006.01) C08L 67/06 (2006.01)

Patent

CA 1135891

ABSTRACT OF THE DISCLOSURE: A low viscosity unsaturated polyester resin for making products, optionally reinforced with glass fibers is described, which comprises an alkyd prepared by ester- ification of maleic anhydride and/or acid and/or fumaric acid in association with isophtalic acid, with one or more glycols, essentially comprising dipropylene glycol, and further comprises 25-40% by weight of the total resin of an ethylenically unsaturated monomer copolymerizable with the alkyd essentially chosen among styrene and vinyl toluene, the alkyd having a molecular weight/double bond factor between 300 and 390 and an amount of free functional groups between 50 and 85 mg of KOH per g of alkyd inclusive. The products obtainable from said resin are also described. The resin has a better behaviour in processing has lower heat development and shrinkage than the comparable prior art resins while the mechanical properties of the finished products are very good.

342811

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