Abstract:
An article of clothing (200) is coated or impregnated with a coating (204) that contains thermochromic pigment. The pigment is constructed to change color when wet with water, and/or to provide a hyperthermic warning when a person wearing the clothing (200) over-warm.
Abstract:
A housing (300) is provided with a thermochromic level indicator (308). The housing may be, for example, a beverage can or bottle. The housing has a wall presenting an interior space capable of retaining matter at a first level within the wall. The housing also has an opening or lid that may be opened to permit the matter to exit from within the wall or enter into the wall such that the matter assumes a second level (311). The wall supports a level indicator (308), which is formed of thermochromic ink. The thermochromic ink has a color transition temperature capable of acting as a level indicator by sensing temperature of the matter retained within the wall in an intended environment of use as the matter transitions between the first level and the second level. By way of example, the matter may be a beverage and the wall forms at least part of a beverage container.
Abstract:
A thermochromic leuco dye composition contains a leuco dye moiety including one or more tri-aryl substituted pyridines, a UVA developer moiety including at least one UVA developer selected from the group consisting of salicylic acid and derivatives thereof, and biphenyls and derivatives thereof, and a carrier selected from the group consisting of a fatty ester, fatty alcohol, fatty amide, and combinations thereof.
Abstract:
Described are novel photochromic naphthopyran compounds which exhibit a red coloring when in a red-colored state achieved upon exposure to ultraviolet light, whereby the red coloring has a lambda max in a range of between about 490 nanometers to about 510 nanometers or between about 490 nanometers to about 500 nanometers.
Abstract:
A microencapsulation process is improved by adding a stabilizing agent that contains one or more catalytic organo-metal oxide materials, such as metal soaps. This functions as a crosslinker by causing unsaturated bonds in the microcapsule walls to react, thereby stabilizing the microcapsules against the effects of additives to coatings that, otherwise, degrade the functionality of thermochromic or photochromic materials at the microcapsule core.
Abstract:
Thermochromic coatings are improved by mixing thermochromic capsules with polymer resins in a manner that imparts shelf stability to flowable precursors that may be cured quickly using dodecylbenzenesulfonic acid and/or other acid catalysts to form relatively hard coatings that are capable of withstanding machine operations, such as the operations needed to make beverage can lids, bottle caps, pull tabs and the like.
Abstract:
Dye and developer components of a leuco dye system are separately microencapsulated. The microcapsule walls are fragile to the point of being easily ruptured. The microcapsules are mixed combined into a coating composition that is applied to a substrate and dried. Forces applied to the substrate, such as by the application of fingers or a writing instrument, rupture the capsule to produce a color change by interaction of the leuco dye system components that are released upon rupture of the capsules.
Abstract:
Thermochromic coatings are improved by mixing thermochromic capsules with polymer resins in a manner that imparts shelf stability to flowable precursors that may be cured to form relatively hard coatings that are capable of withstanding machine operations, such as the operations needed to make beverage can lids, bottle caps, pull tabs and the like.
Abstract:
The present disclosure is a method for controlling the hysteresis window and improving the color switching properties of reversible thermochromic dye systems. The method adds preferred co-solvents to existing reversible thermochromic dye systems in order to decrease the temperature range between the full color point and the clearing point. The co-solvents also add resistance to ultraviolet radiation.