C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 67/06 (2006.01) C08K 5/00 (2006.01) C08K 5/08 (2006.01) C08K 5/13 (2006.01) C08K 5/14 (2006.01)
Patent
CA 2307618
The invention relates to a product and process for producing molded unsaturated polyester products. An unsaturated polyester is formulated with two initiators in combination with two reagents which scavenge free radicals; one of the scavengers traps free radicals which occur at low temperatures of 20 to 50 ~C; whereas the second scavenger traps free radical which are produced and occur in the compositions at temperatures above those low temperatures. The compositions of the invention eliminate premature gelling and insure shelf life.
L'invention concerne un produit et un procédé de fabrication de produits moulés en polyester insaturé. Ce polyester insaturé est préparé au moyen de deux initiateurs combinés à deux réactifs qui piègent des radicaux libres. L'un des piègeurs piège les radicaux libres qui apparaissent à des températures basses comprises entre 20 et 50 ·C, l'autre des radicaux libres qui sont produits et apparaissent dans les compositions à des températures supérieures aux températures susmentionnées. Cette invention permet d'éviter une gélification prématurée et garantit une bonne durée de conservation pour les compositions ainsi obtenues.
Alpha Owens Corning
Moffat & Co.
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