Low viscosity unsaturated polyester resins

Details Low viscosity unsaturated polyester resins Low viscosity unsaturated polyester resins

C - Chemistry, Metallurgy

08

G

400/5757

C08G 63/52 (2006.01) A44B 1/02 (2006.01) B29D 19/04 (2006.01) C08G 63/676 (2006.01) C08L 67/06 (2006.01)

Patent

CA 1131831

ABSTRACT OF THE DISCLOSURE A low viscosity unsaturated polyester resin for making buttons 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 and/or adipic, sebacic, azelaic or dodecanedioic acid, with one or more glycols, essentially comprising dipropylene glycol, and further comprises 20-30% by weight of the total resins 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 80 and 100 mg di KOH per g of alkyd inclusive. The buttons obtainable from said resin are also described. The disc blanks made from said resin have better workability and cause less wear of the tools than those of the prior art and the finished buttons have greater impact strength, better lustre, greater colour stability when exposed to sun light.

342793

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