Process for production acid polyester resins and powder coating products prepared from said resins
AssigneeLabofina S. A.
InventorJozef Verborgt
Life of this patent
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Abstract
Disclosed is a process for producing acid polyester resins used for the manufacture of coatings, especially powder coatings, wherein a prepolymer having a hydroxyl index of between 40 and 200 is reacted with isophthalic acid to form an acid polyester resin having an acid index between 50 and 100 which is further reacted with an epoxy resin.
Claims5
Process for producing acid polyester resins which are used to manufacture coating products by reaction with an epoxy resin, said polyester acid resins being produced from a prepolymer having a hydroxyl index comprised between 40 and 200, said prepolymer being prepared from at least one divalent aliphatic alcohol and a mixture of organic acids, this process being characterized by the fact that said mixture of organic acids comprises from 10 to 100% by weight of terephthalic acid, from 0 to 90% by weight of isophthalic acid and from 0 to 20% by weight of trimellitic acid or its anhydride, and that the acid polyester resin is prepared by reacting said prepolymer with isophthalic acid, said acid polyester resin having an acid index comprised between 50 and 100.
Process for producing powder coating products, which consists in:
- a. preparing a prepolymer having a hydroxyl index comprised between 40 and 200, from at least one divalent aliphatic alcohol and a mixture of organic acids consisting in 10 to 100% by weight terephthalic acid, 0 to 90% by weight of isophthalic acid and 0 to 20% by weight of trimellitic acid or its anhydride,
- b. by preparing an acid polyester resin having an acid index comprised between 50 and 100 by reacting said prepolymer with isophthalic acid,
- c. reacting said acid polyester resin with an epoxy resin.
Dependencies are inferred from the claim text.