Powder coating composition for pipe coating

• Main Authors: ZHOU WENJING J, JEFFERS THOMAS E, DECKER OWEN H, EDMONDSON STEPHEN J
• Format: Patent
• Language: English
• Published: 20.12.2007
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The present invention provides an epoxy powder coating composition comprising an intimate mixture comprising (A) 5 to 99 wt % of at least one bromine functionalized epoxy resin with a bromine content of 5 to 60 % based on component (A), (B) 0.5 to 40 wt % of at least one epoxy curing agent, and (C) 0.01 to 55 wt % of at least one pigment, filler and/or coating additive, the wt % based on the total weight of the powder coating composition. The powder coating composition of this invention provides coating with a high glass transition temperature and acceptable flexibility when coated on metallic or plastic substrates, particularly metallic and plastics pipelines. The coatings may have an improved adhesion under hot and humid conditions as well as an optimum short and long term high temperature and humidity cathodic disbondment protection.