Proposed are a microcapsule having a core-shell structure that has high-temperature durability and solvent resistance and is environment-friendly. The microcapsule includes a core portion containing a hydrophobic active component and a shell portion surrounding the core portion and containing a silane crosslinkable polyurethane-based resin derived from a crosslinkable alkoxy silane group-terminated prepolymer.

Proposed are a microcapsule having a core-shell structure that has high-temperature durability and solvent resistance and is environment-friendly. The microcapsule includes a core portion containing a hydrophobic active component and a shell portion surrounding the core portion and containing a silane crosslinkable polyurethane-based resin derived from a crosslinkable alkoxy silane group-terminated prepolymer.

A leuco compound comprises an antioxidant moiety covalently bonded to a leuco moiety. A laundry care composition comprises (a) at least one laundry care ingredient and (b) a leuco compound as described above. A method of treating a textile comprises the steps of (a) providing such a laundry care composition; (b) adding the laundry care composition to a liquid medium; (c) placing textile articles in the liquid medium; (d) optionally, rinsing the textile; and (e) drying the textile articles.

A leuco compound comprises an antioxidant moiety covalently bonded to a leuco moiety. A laundry care composition comprises (a) at least one laundry care ingredient and (b) a leuco compound as described above. A method of treating a textile comprises the steps of (a) providing such a laundry care composition; (b) adding the laundry care composition to a liquid medium; (c) placing textile articles in the liquid medium; (d) optionally, rinsing the textile; and (e) drying the textile articles.

An aerosol generating article is provided, including a combustible carbonaceous heat source; an aerosol-forming substrate; and a thermal indicator provided on an outer surface of the aerosol-generating article downstream of the combustible carbonaceous heat source. The thermal indicator includes at least one reversible thermochromic material that undergoes a first reversible visible colour change when a temperature of the thermal indicator rises to a first switching temperature and a second reversible visible colour change when a temperature of the thermal indicator falls to a second switching temperature. The first switching temperature is below about 80° C. and the second switching temperature is lower than or equal to the first switching temperature.

An aerosol generating article is provided, including a combustible carbonaceous heat source; an aerosol-forming substrate; and a thermal indicator provided on an outer surface of the aerosol-generating article downstream of the combustible carbonaceous heat source. The thermal indicator includes at least one reversible thermochromic material that undergoes a first reversible visible colour change when a temperature of the thermal indicator rises to a first switching temperature and a second reversible visible colour change when a temperature of the thermal indicator falls to a second switching temperature. The first switching temperature is below about 80° C. and the second switching temperature is lower than or equal to the first switching temperature.

The disclosure discloses a method of preparing electric and temperature dual-control bi-stable color-changing dyes and microcapsules, belonging to the technical fields of fine chemicals and materials science. According to the disclosure, after an electrolyte, a leuco dye and an organic solid material are mixed according to 1:(2-10):(15-50), a series of electric and temperature dual-control bi-stable color-changing dye compounds having a color change temperature range of −5° C. to +80° C. can be prepared. The dye compounds change color under cooperative control of electricity and temperature, and can be continuously stable at a certain color change state according to different conditions, and finally achieve controllable color change conditions and controllable color change stable states. When being driven by voltage and temperature, the dual-control bi-stable color-changing microcapsules prepared according to the disclosure achieve controllable color change performance and color change stable states, and have the driving voltage being lower than 10 V (much lower than the human body safety voltage 36 V).

The disclosure discloses a method of preparing electric and temperature dual-control bi-stable color-changing dyes and microcapsules, belonging to the technical fields of fine chemicals and materials science. According to the disclosure, after an electrolyte, a leuco dye and an organic solid material are mixed according to 1:(2-10):(15-50), a series of electric and temperature dual-control bi-stable color-changing dye compounds having a color change temperature range of −5° C. to +80° C. can be prepared. The dye compounds change color under cooperative control of electricity and temperature, and can be continuously stable at a certain color change state according to different conditions, and finally achieve controllable color change conditions and controllable color change stable states. When being driven by voltage and temperature, the dual-control bi-stable color-changing microcapsules prepared according to the disclosure achieve controllable color change performance and color change stable states, and have the driving voltage being lower than 10 V (much lower than the human body safety voltage 36 V).

A scented color-changing system for revealing a hidden message, brand, picture, and the like on a substrate such as a paper when a fragrance is applied or released on the substrate. The hidden message contains a color former such as a leuco dye and the fragrance contains a color developer such as zinc chloride that reacts with the color former to reveal the message. The fragrance can be sprayed on the substrate or released from microcapsules embedded in or disposed on the substrate by rupturing the microcapsules. The scented color-changing system is particularly suited for use with fragrance test strips, advertising mailers, magazine inserts, and the like.

A scented color-changing system for revealing a hidden message, brand, picture, and the like on a substrate such as a paper when a fragrance is applied or released on the substrate. The hidden message contains a color former such as a leuco dye and the fragrance contains a color developer such as zinc chloride that reacts with the color former to reveal the message. The fragrance can be sprayed on the substrate or released from microcapsules embedded in or disposed on the substrate by rupturing the microcapsules. The scented color-changing system is particularly suited for use with fragrance test strips, advertising mailers, magazine inserts, and the like.