Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized
Patent
1998-04-14
1999-08-10
Cameron, Erma
Coating processes
Direct application of electrical, magnetic, wave, or...
Electrostatic charge, field, or force utilized
427493, 427518, 427519, 427521, B05D 306
Patent
active
059356618
ABSTRACT:
The present invention relates to powder coatings curable by exposure to radiation, typically ultraviolet radiation. Powder coatings based upon cationically catalyzed resins (typically epoxy resins) are described including bisphenols, bisphenols modified by novolac, as well as aliphatic type epoxides including hydrogenated bisphenol-A, glycidyl methacrylic, glycidyl acrylics or related compounds, and vinyl ethers including mixtures of the foregoing compounds. Photoinitiators of sulfonium type, ferrocinium type, iodonium type, triphenolic types and related compounds are also included. Opacifiers, flow agents and plasticizers are also included. Charge additives for improved electrostatic deposition of the power coating are also described. Degassing agents are also typically included in the formulation, both for degassing the powder coating during cure, and to assist in degassing those substrates (such as wood) which tend to form bubbles during cure. Flow agents are also typically included in the formulation. Solidification of photoinitiators prior to use, and the addition of hydroxyl polyesters are shown in the present invention to lead to improved curing and coating performance. Additives are also described which permit the powder coating to flow at temperatures below 100 degrees Celsius, thereby allowing powder coatings to be employed on heat-sensitive substrates such as wood.
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Biller Kevin M.
MacFadden Ben A.
Cameron Erma
Herbert's Powder Coatings, Inc.
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