Powder coating composition comprising a polyester and a crosslinker with oxirane groups providing improved corrosion resistance to a substrate coated therewith

Powder coating composition comprising a polyester and a crosslinker with oxirane groups providing improved corrosion resistance to a substrate coated therewith

  • CN 102,414,245 B
  • Filed: 04/28/2010
  • Issued: 02/08/2017
  • Est. Priority Date: 04/29/2009
  • Status: Active Grant
First Claim
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1. a kind of branched polyester of the carboxylic-acid functional for powdered thermosetting compositions for coatings, wherein:

  • The branched polyester of-described carboxylic-acid functional is made up of at least following monomer:

    Dual functional aromatic acid, described dual functional fragranceAcid is terephthalic acid (TPA) (TPA) and the combination of M-phthalic acid (IPA);

    At least monomer of trifunctional and difunctional alcohol, described doubleFunctional alcohol is at least the combining of ethylene glycol (EG) and neopentyl glycol (NPG);

    And- branched polyester based on described carboxylic-acid functional, soap is used with 0 amount arriving 0.59mol%;

    AndIn the branched polyester of-described carboxylic-acid functional, the mol ratio of TPA and IPA is higher than 5.62 and is at most 12.4;

    And- ethylene glycol is 1 with the % mol ratio of neopentyl glycol;

    1 to 5;

    1;

    And- total amount based on the difunctional alcohol in the branched polyester being present in described carboxylic-acid functional, the amount of NPG is at least 19mol%And at most 45mol%;

    AndThe degree of functionality of the branched polyester of-described carboxylic-acid functional is 2.15-4.0;

    AndThe acid number of the branched polyester of-described carboxylic-acid functional is the branched polyester of 14-80mg KOH/g carboxylic-acid functional;

    AndThe hydroxyl value of the branched polyester of-described carboxylic-acid functional is less than the branched polyester of 10mg KOH/g carboxylic-acid functional;

    AndThe glass transition temperature of the branched polyester of-described carboxylic-acid functional is at least 40 DEG C, and the viscosity at 160 DEG C be toMany 125Pa.s.

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