Low viscosity unsaturated polyester resins

Details Low viscosity unsaturated polyester resins Low viscosity unsaturated polyester resins

C - Chemistry, Metallurgy

08

G

400/5757, 18/715

C08G 63/52 (2006.01) C08G 63/676 (2006.01) C08K 7/14 (2006.01) C08L 67/06 (2006.01)

Patent

CA 1133168

ABSTRACT OF THE DISCLOSURE A low viscosity unsaturated polyester resin for making glass fibre reinforced products is described, which comprises an alkyd prepared by esterification of maleic anhydride and/or acid and/or fumaric acid, optionally together with phthalic anhydride and/or acid, with one or more glycols, essentially comprising dipropylene glycol, and further comprises 27-34% by weight (of the total resin) of an ethylenically un- essentially chosen among styrene and vinyl toluene, the alkyd having a molecular weight/double bond factor between 200 and 360 and an amount of free functional groups between 80 and 100 mg of KOH per g of alkyd inclusive. The product obtainable from said resin by conventional processing techniques are also described. The low viscosity of the resin results in a better workability and a better behaviour during moulding, while the mechanical properties of the finished products are very good.

342794

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