摘要:
This invention relates to a method for preparing a photochromic latex, photochromic thin films obtained therefrom, and articles coated with such thin films, in particular photochromic ophthalmic lenses.
摘要:
This invention relates to a method for preparing a photochromic latex, photochromic thin films obtained therefrom, and articles coated with such thin films, in particular photochromic ophthalmic lenses.
摘要:
The method of the invention comprises: a) forming a hydrophilic polyurethane prepolymer with isocyanate end groups, by the polyaddition reaction of at least one polyol and at least one diisocyanate in the presence of at least one internal emulsifying agent; b) mixing the polyurethane prepolymer with a photochromic agent; c) adding water or a mixture of water and solvent, under agitation, to the mixture of the polyurethane prepolymer and the photochromic agent, to form an emulsion; and d) adding at least one chain extension agent to the emulsion and performing a chain extension reaction to give the final photochromic polyurethane latex. Application to the production of ophthalmic articles having photochromic properties.
摘要:
The process comprises: (1) the preparation of a mixture comprising at least one organic monomer Z with a C═C group, polymerizable by a radical process, at least one organic photochromic compound, at least one surfactant, water and optionally a polymerization primer; (2) the treatment of the mixture obtained in step (1) in order to form a miniemulsion consisting of an organic phase dispersed in the form of droplets having a diameter of 50 to 500 nm, and preferably 50 to 300 nm, in an aqueous phase; (3) the addition to the miniemulsion of a polymerization primer, if this latter was not introduced in step (1), or of a quantity of primer additional to that added in step (1); (4) the polymerization of the reaction mixture obtained in step (3), and (5) the recovery of the photochromic latex.
摘要:
The invention relates to methods for obtaining the photochromic latex comprising the polymerization in aqueous emulsion of an initial polymerizable mixture, comprising one or more monomers polymerizable by free-radical mechanism and one or more photochromic compounds and the addition to the initial polymerizable mixture, during the polymerization of the initial polymerizable mixture or to the final latex of at least one agent for stabilizing the photochromic properties. Such latexes can be used in the production of photochromic films. Such films may be used, for example, on optical lenses.
摘要:
The process comprises: (a) the introduction into a mould of a composition which is polymerizable into a transparent organic glass (b) the polymerization of the composition under conditions such that the resulting substrate made of transparent organic glass has at least one thin surface layer polymerized to a degree of progression and/or of crosslinking which is appreciably lower than that of the remainder of the substrate, and optionally (c) a stress-relieving thermal anneal of the substrate. Application to the manufacture of finished or semi-finished optical or ophthalmic items, in particular photochromic optical or ophthalmic items.
摘要:
The ophthalmic lens according to the invention comprises a substrate made of organic glass, having front and rear main faces, at least one primer layer deposited on at least one of the main faces of the substrate, the said primer layer comprising an aggregate of at least two-phase particles, a first phase of which consists of a polymer P1 with a soft character having a glass transition temperature (Tg) of less than 20° C. and a second phase of which consists of a polymer P2 with a hard character having a glass transition temperature (Tg) of greater than 50° C., and at least one layer of an abrasion-resistant coating composition deposited on the primer layer. Application to lenses for spectacles.
摘要:
In this method of making a mold for molding an optical lens an annular closure sleeve is fitted around two molding shells and cooperates with them to define the required molding cavity. The closure sleeve is made from a heat shrinkable synthetic material and is heated to shrink it onto the molding shells. Applications of the method include molds for molding ophthalmic lenses.
摘要:
A naphthopyran compound represented by the formulae (I) to (II) wherein: —mi, Hi2, p, q are each an integer comprised from O to 4 or 5 inclusive; —Ri, R2 and R4, represent a group selected from halogen, H, —Ra, aryl, —OH, —ORa, —SH, —SRa, —NH2, —NR8RaI, —NRbRc, —NRal-CORa, —NRaiCO(aryl), —NRai aryl, —N-aryfe, —N(aryl)CO(aryl), —CO—R3, —CO2R3I, —OC(O)—Rd, and —X—(Re)—Y, and linear or branched (Ci-Ci8) perfluoroalkyl group, wherein R3, Rai, Rb, Rc, X, Y, Re, Rd are as defined into the description; —Zi re resent a group selected from: (formules).
摘要翻译:由式(I)至(II)表示的萘并吡喃化合物,其中:-mi,Hi2,p,q各自为包含O至4或5的整数; -R 1,R 2和R 4表示选自卤素,H,-R a,芳基,-OH,-OR a,-SH,-SR a,-NH 2,-NR 8 R 1a,-NR b R c,-NRal-CORa, 芳基),氰基芳基,-N芳基,-N(芳基)CO(芳基),-CO-R3,-CO2R3I,-OC(O)-Rd和-X-(Re)-Y, 或支链(C 1 -C 18)全氟烷基,其中R 3,R y,R b,R c,X,Y,Re,R 4如说明书所定义; - 重新选择一个选自:(配方)的组。
摘要:
A photochromic composition that is liquid at 20° C. and includes (a) at least one photochromic dye and (b) an ionic solvent selected from (b)(i) room-temperature ionic liquids (RTIL), (b)(ii) ionic liquid mixtures that are liquid at room temperature, and (b)(iii) room-temperature liquid mixtures of at least one ionic liquid and at least one organic solvent that is miscible therewith. The use of said photochromic composition in optical devices such as ophthalmic lenses is also described.