This application relates to a time-temperature indicator based on increased thermal reactivity of a diacetylene upon melt recrystallization and a method of making it. A diacetylene is crystallized into a low thermal reactivity phase from a solvent system and converted into a higher thermal reactivity phase and low sensitivity to UV light by melt re-crystallization.

A method of imparting color to a plastic substrate comprising applying to the substrate, or incorporating within the substrate, a diacetylene compound of general formula (I) wherein n=1 to 20; R.sup.1=an optionally substituted C.sub.1-20 alkyl group which may contain heteroatoms; T=H, an optionally substituted C.sub.1-20 alkyl group which may contain heteroatoms or (CH.sub.2).sub.mC(O)-Q.sup.2R.sup.2; Q.sup.1=NH, CO, NHCONH, OCONH, COS, NHCSNH or NR.sup.3, wherein m, Q.sup.2 and R.sup.2 are independently selected from the same groups as n, Q.sup.1 and R.sup.1 respectively; R.sup.3 is an optionally substituted C.sub.1-20 alkyl group which may contain heteroatoms; and irradiating the substrate to impart color to the substrate is described.

The invention relates to a coating composition having an amine value of 6-90 mg KOH comprising: i) from 40-97 wt. % of reactive compound (M) containing at least one free radically polymerizable double bond, ii) from 2.5-20 wt. % of radical photoinitiator (R), iii) amine compound (D) containing at least one amino group and iv) non-photobleaching colored dye (C) which is able to react with freeradicals under bleaching of its color, wherein the wt. % is relative to the total weight of the composition, (M) is different from (R); (D) is different from (R); and (C) is different from (R) and (M); and the radical photoinitiator (R) contains species that are able to interact with amino groups in such a way that the generation of free radicals is activated when exposed to electromagnetic radiation.

This application relates to a time-temperature indicator based on increased thermal reactivity of a diacetylene upon melt recrystallization and a method of making it. A diacetylene is crystallized into a low thermal reactivity phase from a solvent system and converted into a higher thermal reactivity phase and low sensitivity to UV light by melt re-crystallization.

The present invention relates to labels and labelstock materials, and to substances used therein, and components thereof. The present invention further relates to a method of manufacturing the labelstock and labels, uses thereof and products comprising them.

The present invention relates to thermochromic micro particles capable of stably implementing a high chromogenic property and a decolorization property and having an improved erasing property, thermal resistance, and chemical resistance, and a thermochromic ink composition, a writing apparatus, and a smart window using the same. The thermochromic micro particles comprise a core part including a phase change material and a dye, the phase change material including a phenol-based compound containing an aliphatic functional group having a carbon number of 6 or more; and a shell layer including a polymer resin.

Ink formulations and methods of using the same in laser-imaging are provided. An ink formulation can comprise a graphene-based component, a colour change agent, a binder, and a solvent. Substrates, coatings, and articles comprising a graphene-based component are also provided, and laser marking can be brought about by an ablation or direct charring process.

The present invention relates to thermochromic micro particles capable of stably implementing a high chromogenic property and a decolorization property and having an improved erasing property, thermal resistance, and chemical resistance, and a thermochromic ink composition, a writing apparatus, and a smart window using the same. The thermochromic micro particles comprise a core part including a phase change material, a dye, and a developer, the phase change material including at least one selected from the group consisting of at least one chain hydrocarbon having a carbon number of 8 or more, a hydrated inorganic salt, alcohol having a carbon number of 3 or more, and polyalkyleneglycol; and a shell layer including a polymer resin.

This application relates to a time-temperature indicator based on increased thermal reactivity of diacetylene upon melt recrystallization and a method of making it. A diacetylene is crystallized into a low thermal reactivity phase from a solvent system and converted into a higher thermal reactivity phase and low sensitivity to UV light by melt recrystallization.

A substrate can be positioned for coating by a deposition device. The deposition device can coat the substrate with photosensitive material. The coated substrate can be positioned for exposure to light from a light source. The light source can expose a portion of the coated substrate to light to produce printed information.