Processes for producing alkyd resins

Details Processes for producing alkyd resins Processes for producing alkyd resins

C - Chemistry, Metallurgy

08

G

C08G 63/78 (2006.01) C08G 63/48 (2006.01) C08G 63/49 (2006.01) C08J 11/24 (2006.01) C08G 63/82 (2006.01) C08G 63/83 (2006.01) C08G 63/85 (2006.01)

Patent

CA 2383654

Processes for producing within a short time transparent alkyd resins which are substantially free of occurrence of foreign matters or filtration residues are disclosed, which comprise depolymerizing polyester resins whose chief starting material is terephthalic acid and which have been recovered from waste materials and regenerated, with use of a polyhydric alcohol component having tetra- or higher hydric alcohol, and thereafter adding thereto a polybasic acid component (and if necessary a fatty acid component) to effect an esterification reaction.

Cette invention concerne un procédé permettant de fabriquer en un bref laps de temps un résine alkyde transparente pratiquement exempte de substances étrangères et de résidus de filtrage. Ce procédé consiste à : soumettre une résine polyester, tirée d'un acide téréphtalique en tant que matériau principal de départ récupéré de rebuts, à une dépolymérisation avec un composant d'alcool polyhydrique renfermant un alcool tétrahydrique ou plus élevé, puis à ajouter un composant d'acide polybasique (éventuellement avec un composant d'acide gras) de manière à estérifier le produit de dépolymérisation.

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