Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
  • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
  • B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
  • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
  • B05D5/061—Special surface effect

Definitions

• This invention concerns non-stick coated cookware, with a decorative pattern visible through a light transmitting topcoat. More specifically, it concerns such cookware with a pattern formed by discontinuous globules..
• U.S. Patent 4,259,375- Vassiliou (1981) discloses a article of cookware with a 3-layer coating having a discontinuous speckled or spattered pattern in a partial layer directly beneath the topcoat.
• the spattered coating is deliberatly sprayed directly on the layer under it while the under layer is still wet and soft so that the spattered layer sinks into the under layer and does not provide roughness that could telegraph through the surface. It was said that roughness would provide a place for a fork or other utensil to catch in the coating and tear the coating.
• the spattered layer dots were also sprayed on directly, such as at 90 degrees from the sustrate, so as to form more or less round dots.
• U.S. Patent 3,961,993 - Palisin (1976) discloses spraying multilayer polymer coatings on a substrate, one layer being sprayed on top of the layer under it after the under layer has become tacky.
• a tacky underlayer permits the successive layer to adhere better without completely merging indistinguishably with the underlayer. Still, any roughness in the upper layer would tend to smooth out as the two layers interact.
• the present invention provides a article of cookware and a method of making it, having a cooking surface which comprises a multi-layer, non-stick coating on a substrate which coating minimizes sticking by food residues and which is heat resisting by being stable at temperatures above 300°C, wherein the coating comprises a primer adhered to the substrate, a non-stick, heat-resisting, light-transmitting topcoat, and optionally one or more intermediate coats, with the topcoat adhered to any such intermediate coats which are adhered to the primer, or in the absence of intermediate coats, the topcoat being adhered directly to the primer, with the coating under the topcoat having a first color or darkness, wherein a discontinuous layer of globules is present on or in and covers no more than 80% of the area of the coating under the topcoat, said globules having at least one color or darkness which is visibly diiferent than said first color or darkness a seen through said topcoat, said discontinuous layer is applied, by at least two applications of globules,
• Included in the invention are a method of making an article in which the coatings are applied by spraying coating compositions successively on the substrate and ultimately heating the article to cure the coating, wherein the coating under the discontinuous coating is dried enough before applying the discontinuous coating so that substantial portions of the spattered coating remains on top of said under coating to create the roughness telegraphing through the topcoat.
• the undercoat is not dried before applying the discontinuous coat which then sinks into the undercoat, resulting in a substantially smooth topcoat.
• One embodiment of the process for obtaining the present invention is the drying or "flashing" the primer or intermediate coat before applying the discontinuous coat, adequately so the spattered dots do not sink into the primer or the intermediate coat.
• air flow for 30 seconds or longer, or preheating the substrate or the air with a shorter time of air flow, will suffice.
• the globules can be applied wet-on-wet and permitted to sink into the underlayer so long as they do not merge ad lose their distinctiveness.
• wetting is generally not a problem with most heat resistant materials useful for cookware coatings, especially perfluoropolymers such a polytetrafluoroethylene and (PTFE) and copolymers of TFE and fluorovinyl ethers (PFA).
• PTFE polytetrafluoroethylene and
• PFA fluorovinyl ethers
• the coatings contain oxide-coated mica, and preferably the oxide in Ti0 2 , a described in U.S. Patents 3,087,827 - Klenke et al., 3,087,828 and 3,087,829 - both to Linton, and granted 1963.
• a primer having the composition of Table 1 is sprayed on a clean, lightly etched aluminum substrate to a dry film thickness (DFT) of 7.5 to 10 microns, the primer is dried at 66°C for 3 minutes and a black midcoat of Table 2 is applied to a DFT of 17.5 to 20 microns.
• the midcoat is allowed to dry at ambient temperature for 45 seconds and three separate inks or spatter coatings are applied using a De Vilbiss spatter gun to provide a discontinuous coating.
• the inks of Table 3 or 4 are colored to be significantly different than the black midcoat background and are sprayed at a 45° angle (or at a angle of from 30 to 75°) to provide irregular shapes on the spinning substrate. The effect is to provide an appearance of natural stone.
• the inks are not limited to solid color pigments but also include color achieved by reflectace with coated mica.
• a topcoat of Table 5 is then applied wet-on-wet over the spattered particles.
• the topcoat in this example, contains mica particles in a 1-15 micron particle size range so as not to interfere with the aesthetics of the spatter coat.
• the entire system is sintered at 427 to 435°C for 5 minutes with the measured temperatures being that of the substrate metal.
• first discontinuous coat of a relatively darker color or optical density than the second a well as each successive globule coat being of a progressively lighter color or darkness.
• One preferred combination is to have a black base coat (the intermediate on which the discontinuous globule coats are to be sprayed) with the first globule coat in a dark brown, the second globule coat in a lighter gray, and an optional third globule coat in white.
• the spray is preferably done from a spatter gun, resulting in random coverage and more or less overlap of the globules of one application by those of the next application.

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• 1995
  • 1995-12-06 CN CN95196979A patent/CN1090543C/zh not_active Expired - Fee Related
  • 1995-12-06 EP EP98203949A patent/EP0936001A1/de not_active Withdrawn
  • 1995-12-06 BR BR9510489A patent/BR9510489A/pt not_active IP Right Cessation
  • 1995-12-06 DE DE69510234T patent/DE69510234T2/de not_active Expired - Fee Related
  • 1995-12-06 WO PCT/US1995/015793 patent/WO1996019299A1/en active IP Right Grant
  • 1995-12-06 ES ES95944604T patent/ES2135114T3/es not_active Expired - Lifetime
  • 1995-12-06 EP EP95944604A patent/EP0804293B1/de not_active Expired - Lifetime
  • 1995-12-06 JP JP8519833A patent/JPH10510760A/ja not_active Ceased
  • 1995-12-06 KR KR1019970704252A patent/KR100296070B1/ko not_active IP Right Cessation
• 1998
  • 1998-04-15 HK HK98103101A patent/HK1004122A1/xx not_active IP Right Cessation

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