MXPA00010555A - Opthalmic lens made of organic glass, comprising an antishock primer coat - Google Patents

Abstract

The inventive lens comprises an organic glass substrate having front and rear main surfaces, at least one primer coat deposited on at least one of the main surfaces of the substrate, whereby said primer coat consists of a mixture of at least biophasic particles, whereby a first phase is composed of a P1 softcharacter polymer with a glass transition temperature (Tg) of less than 20 deg;C and a second phase is composed of a hardcharacter P2 polymer with a glass transition temperature (Tg) of more than 50 deg;C and at least one coat of an antiabrasive covering composition deposited on the primer. The invention can be used for eye glasses.

Description

ORTHANTIC GLASS OPHTHALMIC LENS, THAT COMPRISES A MAIN LAYER ANTI-SHOCKS The invention relates, in general, to an ophthalmic lens of organic glass, comprising on at least one of its surfaces a main anti-shock layer constituted by an aggregate of at least two-phase particles and in particular an aggregate of polymeric particles having a heart / cortex structure. It is well known that organic glass ophthalmic lenses are more sensitive to scratching and abrasion than mineral glass lenses. For this reason, it is common practice to protect the surfaces of organic glass lenses with at least a hard coating (anti-abrasion), in particular a polysiloxane-based coating. On the other hand, it is also known to treat organic glass lenses to prevent the formation of annoying parasitic reflections for the lens carrier and its interlocutors. Thus, it is conventional to provide organic glass lenses with a mono- or multi-layer anti-reflection coating, usually mineral matter. However, when the lens comprises in its structure a hard anti-abrasion coating and optionally an anti-reflection coating placed on the hard anti-abrasion coating surface, the presence of these coatings decreases the impact resistance of the final ophthalmic lens, by making stiff the riHÉüUt- - - "- * '* ** > ~ * 8 * s system that then becomes brittle To remedy this problem, it has already been proposed to place a layer between the organic glass lens and the hard anti-abrasion coating. According to Japanese patents 6314001 and 6387223, organic glass lenses are comprised of a thermoplastic polyurethane resin-based anti-shock main layer, US patent 5 015 523, which advocates the use of main anti-shock acrylic, however the European patent EP-0 404 1 1 1 describes the use of main anti-shock polyurethane-based thermoing .. The document of EU 5 316 791 describes the use of a main anti-shock layer formed a From an aqueous dispersion of polyurethane applied directly on an organic glass substrate surface, the main anti-crash layer can be obtained by drying and air hardening a dispersion of water. Bearing or latex of a polyurethane which may optionally contain an anionically stabilized acrylic emulsion. Although these prior art anti-shock main layers assure both an acceptable adhesion of hard anti-abrasion coating and a suitable resistance to shocks, they do not provide complete satisfaction, particularly as regards the minimum breaking energies. Thus, it is still desirable to have new main anti-crash coatings ready, which have qualities of . ^. " ... _ * "**,. ._, -, - - .., * ..... .- ^ -.-_ ^^^ _ jm ^^ t ^ -_. ,, _, ^ »^ _,? _ ^ _ M (Mda ^ ¡- resistance to improved shocks, and in particular improved medium and minimum breaking energies It has now been found that it is possible to improve the impact resistance of lenses ophthalmic organic glass, when using for the main anti-shock layer an aggregate of particles at least biphasic, of which one of the phases is constituted by a polymer that has a soft character and another phase by a polymer that has a character hard and having vitreous transition temperatures located in the predetermined domains According to the invention, an ophthalmic lens is made having improved shock resistance characteristics, comprising an organic glass substrate having main surfaces, front and rear, less a main layer placed on at least one of the main surfaces of the substrate, the main layer comprising an aggregate of at least two-phase particles, of which a first phase is constituted by a mild polymer P1 having a glass transition temperature (Tg) lower than 20 ° C and a second phase is constituted by a hard polymer P2 having a glass transition temperature (Tg) ) higher than 50 ° C, and at least one layer of an anti-abrasion coating composition placed on the main layer. In the present description and the claims, "at least two-phase particles" or "two-phase particles" will mean an aggregate of particles comprising at least two distinct particular phases, these two particular phases eventually joined together by one or more other particular phases which they constitute one or the intermediate binding layers. Preferably, the biphasic organic particles have a heart / shell structure, preferably the heart being constituted by the polymer P1 and the shell by the polymer P2. Still preferably, the polymer P1 is in the form of individualized nodules dispersed in a matrix constituted by the polymer P2 and the polymer P1 has a hydrophobicity higher than that of the polymer P2. In general, the main anti-shock layer is a hydrophobic thermoplastic film, without surface adhesive, consisting of 70 to 90% by weight of the polymer P 1 of soft character and from 1 to 30% by weight of the polymer P2 of hard character. Preferably, also, polymer P1 has a Tg of less than 0 ° C and polymer P2 has a Tg of greater than 60 ° C. The polymers P1 and P2 of the main layers according to the invention are generally composed of: - 90 to 100% by weight of the reactants obtained by polymerization of at least one monomer selected from group (I) consisting of alkyl (Ci) -cß-esters of (meth) acid acrylics such as methyl (meth) acrylate and butyl (meth) acrylate, vinyl esters of linear or branched carboxylic acids such as vinyol acetate and vinyl stearate, styrene, alkylstyrenes such as a-methyl styrene, haloalkylstyrenes such as chloromethylstyrene , dienes - * - • - - • - - conjugates such as butadiene and isoprene, (meth) acrylamide, acrylonitrile, vinyl chloride, and (meth) acrylic acids and their derivatives such as anhydrides; and - 0 to 10% by weight of the reactants obtained by polymerization of at least one monomer selected from group (II) consisting of allyl esters of α, β-unsaturated monocarboxylic or dicarboxylic acids such as allyl acrylate, allyl methacrylate and diallyl maleate; conjugated dienes such as butadiene and isoprene, polyol poly (meth) acrylates such as ethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,4-butenediol diacrylate and pentaerythritol tetraacrylate, polyvinylbenzenes such as divinylbenzene or trivinylbenzene, and polyallyl derivatives such as triallyl cyanurate and triallyl trimesate. The monomers of group (II) act as network forming agents in polymers P1 and P2. In general, the soft-type polymer P1 is mainly composed of the polymerization of at least one monomer selected from butyl acrylate, butadiene and isoprene, however the hard polymer P2 is generally composed mainly of motifs derived from the polymerization of at least one monomer chosen from methyl methacrylate, styrene and vinyl chloride. In the case of a heart / cortex structure, preferably only the heart is formed into networks, the monomers Preferred network formers are butadiene and butanediol-1,4-diacrylate, and the content of network-forming monomers is comprised between 0 and 10% by weight, per report in total weight of particles. The hard polymer P2 can be grafted directly onto the polymer P1 or by introducing on the latter the remains of monomer motifs. These residues of monomer motifs are obtained by the incorporation into the mild polymer P1 of grafted monomers chosen from either conjugated dienes, monomer residue residues resulting from partial incorporation into 1,2-diene when the polymerization is either between allyl esters of α, β-unsaturated carboxylic or dicarboxylic acids, which have two copolymerizable functions of different reactivities. The preferred grafted monomers according to the invention are butadiene, allyl methacrylate and diallyl maleate. The polymers P1 and P2 according to the invention can be prepared by emulsion polymerization in two phases, as described below, from the monomers selected from group (I) and optionally group (II) above. The selection of the monomers for both the soft polymer P1 and the hard polymer P2 is conditioned by the properties such as hydrophobicity, glass transition temperature, which are desired to confer to the polymers in question. The main layer according to the invention can be obtained in particular from a latex containing particles of polymers P1 and P2, in particular of the hydrophobic polymers P1 and P2, structured in heart / shell. When the mass share of the crust in the total weight of the polymer particles does not exceed 30%, the latex applied on a surface of an organic glass substrate 5 is given after drying at a base temperature, and without the intervention of agents of coalescence or volatile organic compounds, a continuous film, structure in the form of soft nodules, dispersed in a hard matrix, homogeneous, without surface adhesive and having a good mechanical tenuous. In general, hydrophobicity is the non-solubility in water or the absence of affinity with respect to water. According to the invention, this absence of affinity can be hierarchized. In effect, the hydrophobicity according to the invention is defined by the solubility parameter (?) As described in "properties of polymers" of D.W. Van Krevele, 1990, 3rd edition, p. 220. This parameter allows the different polymers to be classified according to their affinities with respect to water. According to the invention, a polymer is hydrophobic if its (?) is less than 26. In addition, if (?) of a polymer 1 is less than (? 2) of a polymer 2, then 1 is more hydrophobic than 2. 20 A convenient latex for The embodiment of the main layers according to the invention is a latex which does not contain any coalescing agents or volatile organic compounds, which is formed into a film by evaporation at a temperature below 40 ° C and preferably close to 25 ° C, the latex being based on particles of hydrophobic polymers structured in heart / cortex, and aMüfiMÉtt il - - .. -. * constitute: - 70 to 90% by weight of at least one polymer P1 of mild character having a Tg of less than 20 ° C, which forms the heart, and of - 10 to 30% by weight of at least one polymer P2 of hard character, that has a Tg superior to 50 ° C that forms the crust. Preferably, the heart has a Tg less than 0 ° C and the cortex a Tg greater than 60 ° C. In addition, the heart is generally more hydrophobic than the cortex. The latex particles of the invention preferably have a size of 30 to 400 nm and better still of 50 to 250 nm. One of the preferred latexes of the invention is a latex of heart / shell structure not formed in heart networks and functionalized with the (meth) acrylic (and preferably methacrylic) functions in the cortex. The latexes of the invention are prepared in two stages, by emulsion polymerization of a monomer mixture consisting of: 90 to 100% by weight of at least one monomer selected from group (I), and 0 to 10% by weight weight of at least one monomer selected from group (II). Generally, the latexes are prepared by the emulsion polymerization in at least two stages according to the polymerization techniques well known to the person skilled in the art.

- -. - - • ...-..- * .. -. ».... * ... -.... - ^., * .. * .- ** J. ^ * -, ".. *,. ^. - * ..,. "- ....... --.-. ... _,. . . *: ... * * t. & A *. matter. The composition of the monomer mixture to be polymerized in each step depends on the character that is desired to give the polymers formed in this step (Tg, hydrophobicity). According to the invention, polymer P1 of a soft nature and Tg of less than 20 ° C constituting the heart of the particles is prepared in a first stage, then the preparation of polymer P2 at Tg greater than 50 ° C which constitutes the bark of hard character. It will be noted that for the particles to be structured in a perfect manner, the mixture of monomers to be polymerized to form the core must be more hydrophobic than that to be polymerized to form the shell. For each step, the polymerization reaction is preferably carried out in an inert atmosphere in the presence of radical primers. The priming system used can be an oxido-reducing system, a thermal or peroxide system such as tert-butyl hydroperoxide / sodium bisulfate or di-isopropylbenzene, the amounts used comprise between 0.2 and 1% by weight per report of the total mass of monomers, preferably between 0.25 and 0.5% by weight. The emulsion polymerization reaction according to the invention is used at a temperature between 25 and 150 ° C and is a function of the nature of the priming system used. The preparation of the dispersions according to the invention is preferably carried out according to a process of the semi-continuous type which makes it possible to limit the derivatives of the compositions which are the function of the differences in the reactivity of different monomers. The introduction of the monomers either pure, either in the form of a pre-emulsion with a part of water and surfactants, is thus generally carried out over a period of time of 3 hours 30 to 5 hours. It is equally useful, although not essential, to sow 1 to 15% of monomers. The emulsifier systems used in the emulsion polymerization process are chosen from the range of emulsifiers having a suitable hydrophilic / lipophilic balance. Preferred systems are constituted by the combination of an anionic surfactant, such as sodium lauryl sulfate, ethoxylated nonyl phenol sulphates, in particular 20-25 moles of ethylene oxide, benzene dodecylsulfonate and ethoxylated fatty alcohols of sulfates, and of a non-surfactant. ion, such as the ethoxylated nonylphenols, in particular 10-40 moles of ethylene oxide and ethoxylated fatty alcohols. Suitable substrates for lenses according to the present invention are all organic glass substrates commonly used by organic ophthalmic lenses. Among the substrates suitable for the lenses according to the invention, mention may be made of the substrates obtained by polymerization of alkyl methacrylates, in particular alkyl methacrylates of dC, such as methyl (meth) acrylate and ethyl (meth) acrylate, allylic derivatives such as such as aliphatic polyols allyl carbonates or . . «. . .. .. i,. _ ... ^ i ?? j f ** ~ u. . I -i .... ^ ',. .. . . * Amino acids, linear or branched, thio (meth) acrylics, thiourethanes, polyethoxylated aromatic (meth) acrylates such as polyethoxylated bisphenolates dimethacrylates and polycarbonates (PC). Among the recommended substrates, mention may be made of the 5 substrates obtained by polymerization of allyl carbons of polyols, among which ethylene glycol bis allyl carbonate, diethylene glycol bis 2-methyl carbonate, diethylene glycol bis (allyl carbonate), ethylene glycol bis (2) can be mentioned. -chloro allyl carbonate), triethylene glycol bis (allyl carbonate), 1,3-propanediol bis (allyl carbonate), propylene glycol bis (2-10 ethyl allyl carbonate), 1,3-butanediol bis (allyl carbonate), 1, 4- butanediol bis (2-bromo allyl carbonate), dipropylene glycol bis (allyl carbonate), trimethylene glycol bis (2-ethyl allyl carbonate), pentamethylene glycol bis (allyl carbonate), isopropylene bis phenol-A bis (allyl carbonate). The substrates which are particularly recommended are the substrates obtained by the polymerization of bis allyl carbonate of diethylene glycol, sold under the trade name CR 39® for the company PPG INDUSTRIE (lens HORMA® ESSILOR). Among the substrates also recommended, mention may be made of the substrates obtained by the polymerization of thio (meth) acrylic monomers, such as those described in French patent application FR-A-2 734 827. Obviously, the substrates can be obtained by the polymerization of the mixtures of the above monomers. For ophthalmic lenses made of polycarbonate (PC) material, thermoplastic, these lenses are already very Resistant to shocks, the main ones according to the invention can be used advantageously as adhesion principals. The hard anti-abrasion coatings of the ophthalmic lenses according to the invention can be all the anti-abrasion coatings known in the field of ophthalmic optics. Among the hard anti-abrasion coatings recommended in the present invention, mention may be made of the coatings obtained from compositions based on silane hydrolyzate, in particular epoxysilane hydrolyzate, such as those described in French Patent Application No. 93. 026 49 and U.S. Patent 4 21 1 823. A composition for the preferred hard anti-abrasion coating comprises an epoxysilane and dialkyldialkoxysilane hydrolyzate, colloidal silica and a catalytic amount of aluminum acetylacetonate, the remainder being essentially the solvents conventionally used for the formulation of such compositions. Preferably, the hydrolyzate used is a hydrolyzate of β-glycidoxypropyltrimethoxysilane (GLYMO) and dimethyldiethoxysilane (DMDES). As indicated above, the ophthalmic lens according to the invention may further comprise an anti-reflection coating placed on the anti-abrasion coating. As an example, the anti-reflection coating can be constituted of a mono- or multilayer film, of dielectric material such as SiO, SiO2, Si3N, TiO2, ZrO2, AI2O3, MgF2 or TaO5, or their mixtures. Thus, it is possible to prevent the appearance of a reflection in the lens interface to the air. This anti-reflection coating is generally applied by vacuum deposition according to one of the following techniques: 1. by evaporation, possibly assisted by ion beam. 2. by spray by ion beam. 3. by cathodic spraying. 4. by plasma-assisted vapor deposition chemical deposit In addition to vacuum deposition, it can also consider a deposit of a mineral layer by sol / gel (for example from tetraethoxysilane hydrolyzate). In the case where the film comprises a single layer, its optical thickness must be equal to? / 4 (? Is a wavelength comprised between 450 and 650 nm). In the case of a multilayer film comprising three capable, a combination corresponding to the respective optical thicknesses can be used? / 4,? / 2,? / 4 or? / 4 -? / 4 -? / 4. Furthermore, an equivalent film formed by more layers can be used instead of any number of layers that are part of three layers mentioned above. The ophthalmic lenses according to the invention can consist of an organic glass substrate coated on its rear surface or its front surface with a main anti-shock layer according to the invention, with an anti-abrasion coating placed on the main layer and optionally with a coating anti-reflection on the anti-abrasion coating. Likewise, the substrate can be coated on its two surfaces of a main anti-shock layer according to the invention, of an anti-abrasion coating and optionally of an anti-reflection coating. The preferred ophthalmic lenses according to the invention comprise a single main anti-shock layer placed on the back surface of the lens and on each of the surfaces an anti-abrasion coating and an anti-reflection coating applied on the anti-abrasion coating. For example, a lens according to the invention can be obtained by depositing a layer of a latex composition such as defined above on the back surface of the lens and allowing that latex to dry at room temperature or at a temperature close to room temperature. to form the main anti-shock layer. The anti-adhesion hard coating is then applied to both lens surfaces by soaking. Finally, after the hardening of said hard coating, an anti-reflection coating can be applied on one or both surfaces of the lens. An ophthalmic lens thus obtained has an excellent resistance to abrasion on its front surface, more sought after by user manipulations and excellent resistance to shocks. In general, the thickness of the main anti-shock layer according to the invention is comprised between 0.1 and 1.0 μm, preferably between 0.0 and 3.5 μm and better between 0.5 and 2 μm. The thickness of the anti-abrasion coating is generally between 1 and 10 μm, and more particularly between 2 and 6 μm. The following examples illustrate the present invention. In the examples, unless otherwise indicated, all percentages and parts are expressed by weight. Example of latex preparations according to the invention Preparation of a latex A The operation is carried out in a 5 liter reactor equipped with a stirrer, a temperature tap and a double cover covered by a heat transfer fluid for the preservation of the reactor at a temperature. In this reactor, maintained at room temperature, and under stirring, after degassing by nitrogen, 1500 g of demineralized water and 4.8 g of disodium phosphate are introduced, then 40.05 g of lauryl are dissolved in this medium. Sodium sulfate as an emulsifying agent. The temperature of the reactor content is then induced at 57 ° C and, maintaining this temperature, then 991, 75 g of n-butyl acrylate and 9.2 g of butanediol-1,4-diacrylate are simultaneously added to said content simultaneously. . The reactor temperature is set at 66 ° C and 1.3 g of potassium persulfate dissolved in 2.5 1 of water and 0.925 g of disodium sodium bisulfate in 35 g of water are added to the reaction medium. After an induction time of approximately 15 minutes, the temperature rises to 1 07 ° C. After this exotherm, a mixture consisting of 98.9 g of n-butyl acrylate and 5.48 g of diallyl maleate is added to the reactor 10 maintained at 80 ° C, then 0.05 g of potassium persulfate dissolved in 25 g. g of water. The temperature is maintained at 80 ° C for one hour. The elastomeric core consisting of latex particles of Coulter diameter of 15 77 nm is obtained with a conversion of 97%. To the previously obtained reactive medium, maintained at 80 ° C, add, under stirring, 1 g of sodium formaldehyde sulfoxylate in 5 g of water. 279.9 g of methyl methacrylate are added over a period of one hour, and on the other hand 0.825 g of methyl methacrylate are added. diisopropylbenzene hydroperoxide in 275 g of water. The content of the reactor is maintained at 80 ° C for 1.5 hours, after the start of the addition of methyl methacrylate, and 0.5 g of tert-butyl hydroperoxide is added to said content and 0.175 g of sodium bisulfite in 10 g of water. 25 The reaction mixture is then kept at 80 ° C for ^ ÉM ^ dilriíilta ^ M ^ -a one hour. At the end of this duration, the content of the reactor is cooled to room temperature. A grafted copolymer latex is obtained with a conversion of 96.4%, of which the average diameter of the particle is 85 nm and the dry extract is 39.9%. The analysis of the polymer obtained shows that it has 2 Tg, one located at -38 ° C and the other at 105 ° C. Preparation of a latex B The procedure is the same as before, except that the composition of monomers to be polymerized in each stage is modified in order to modify the Tg of the prepared copolymers. The characteristics of the latex B particles are as follows: Latex B: Average diameter of the particles: 90 nm Tg1: -49 ° C Tg2: 100 ° C Preparation of a latex of ABu / MMA (70/30) A latex of butyl acrylate (ABu) / methyl methacrylate is prepared ( MMA) as follows: Preparation of the tank foot 0.82 g of surfactant DISPONIL® A 3065 (mixture of fatty alcohols at 30 EO, 65% of active materials) and 0.55 g of surfactant DISPONIL® FES (C12- ? (OCH2CH2) 12OSO-3Na +) are solubilized in 148.9 g of water. The mixture is stirred for 10 minutes. gj4 ^ «« ^ S ^ minutes, then it is introduced into a double-walled reactor, of which the lid comprises 5 inlets (for nitrogen, thermometer, stirrer, priming and pre-emulsion emptying). The reactor is degassed for 1 hour. Preparation of the priming solution In parallel, 1.6 g of sodium persulfate are dissolved in 12.4 g of water. Preparation of a latex with a heart / bark structure of ABu / MMA 70/30 The heart of the latex is prepared in a first stage by emptying the pre-emulsion in 2h48, then in a second time, when the crust is emptied in 1hr 12 preemulsion II. The priming solution is introduced concomitantly to the aggregate of preemulsions I and II, for 4 hours. The compositions of the tank foot, the pre-emulsions I and II and the fattening solution are indicated in the table below: % - * > The obtained product is a latex of ABu / MMA 70/30 having the following characteristics: Dry extract (%) Size of the particles (nm) 44 210 Examples of embodiments of lenses with main layer according to the invention To form the anti-aging main layers -Ophthalmic lens bumpers We have used the following examples, the latexes indicated in the table below. The network former of which it is a question is then that of the heart (ABu) of the particles. In Example 4 below, MMA is contained in the shell of the particles. ^^ & £ «M? PU (PES): Polyurethane latex of aliphatic polyester motifs NEOREZ® R 965 from the Company ZENECA Acri: Latex A 639 (acrylic / styrene) from the Company ZENECA ABu: Butyl acrylate MMA: Methyl methacrylate BDA: Butyl diacrylate MAA Methacrylic acid. (Latex 2 to 7 are latexes according to the invention). The back surface of the organic glass substrate has been coated with a layer of one of the main according to the invention and of the main ones of the prior art, as indicated in the table below. The characteristics of the lenses obtained are also given in the table. All lenses equally comprise, on the main layer, an identical layer of anti-abrasion coating and an identical layer of an anti-reflection coating. -. & Substrate A: ORMA® of CR 39® of the ESSILOR Company. Force: - 2 diopters - Thickness at the center: 2 mm. Substrate B: ORMA® of CR 39® of the ESSILOR Company. Strength: - 2 diopters - Thickness at the center: 1, 1 mm. Anti-abrasion coating: The composition of the anti-abrasion coating is obtained as follows: 80.5 parts of 0.1 N hydrochloric acid are dropped dropwise into a solution containing 224 parts of GLYMO and 120 parts by weight of DMDES. The hydrolyzed solution is stirred for 24 hours at room temperature then 718 parts by weight of colloidal silica in 30% in methanol, 15 parts by weight of aluminum acetylacetonate and 44 parts by weight of ethylcellolose are added. Finally, a small amount of surfactant is added. The main coated lens on the back surface is placed in a bath comprising the coating composition, j ^ ¿gß ^^^ - * after removing from the bath, the lens is heated 90 ° C for 1 hour. The thickness of the anti-abrasion coating, after hardening, is 3 μm. Anti-reflection coating: The anti-reflection coating is applied on the two surfaces of the lens (on the anti-abrasion coating) by deposition, in vacuum, of the following successive layers: Material It is optical weight First layer placed: ZrO2 55 nm Second layer placed: SiO2 30 nm Third layer placed: ZrO2 160 nm Fourth layer placed: SiO2 1 20 nm (top layer) Optical thicknesses are given for? = 550 nm ..}. The rupture energy of the lenses is measured according to the FDA standard for resistance to ophthalmic glass shock. This test consists of dropping a 16 g ball from a height of 127 cm onto the center of the convex surface of the lens, which represents an energy of 200 mJ. The glass is conforming to the standard if it does not break or crash. To measure the breaking energy of the ophthalmic lenses, the balls of breakable energy in the center of the lenses are dropped to the star-shaped slit or rupture thereof. The breaking energy of the lens is then calculated. This test has been carried out for each lens on a - **** ~ * ~ - series of 20 lenses and thus a mean break energy is determined as well as the minimum break energy corresponding to the lowest energy, which causes the star-shaped crack or break of one of the lenses of the series. This last is important, because to satisfy the FDA test, all lenses in a series must have a minimum breaking energy of at least 200 mJ. The results are given in the table below.

The results show that: 1 / the presence of anti-abrasion and anti-reflection coatings considerably reduces the impact resistance of organic glass substrates: 2 / the use of a main anti-shock layer according to the invention significantly improves the impact resistance in Comparison with a main anti-shock PU (PES) / Acri of the prior art. In particular, in the lenses according to the invention, not only is the average energy guaranteed, but also the minimum energy is always widely superior to 200 mJ, this is not the case for the lenses comprising a PU main layer (PES) ) / Acri. In addition, the dispersion of the results is also lower. In short, it is observed that the shocks are broken when the formation of heart networks decreases.

Claims (17)

1. EIVINDICATIONS 1. Ophthalmic lens comprising an organic glass substrate having main surfaces, front and rear, at least one main layer placed on at least one of the main surfaces of the substrate, said main layer comprising an aggregate of at least two-phase particles, of which one The first phase is constituted by a mild polymer P1 having a glass transition temperature (Tg) lower than 20 ° C and a second phase is constituted by a hard polymer P2 having a higher glass transition temperature (Tg) at 50 ° C, and at least one layer of an anti-abrasion coating composition placed on the main layer. Ophthalmic lens according to claim 1, characterized in that the biphasic organic particles have a heart / shell structure 3. Ophthalmic lens according to claim 2, characterized in that the heart is constituted by the polymer P1 and the cortex by the polymer P2. Ophthalmic lens according to any of the preceding claims, characterized in that the polymer P1 represents 70 to 90% by weight of the main layer and the polymer P2 represents 10 to 30% by weight of the main layer. Ophthalmic lens according to any of the preceding claims, characterized in that the polymer P1 is dispersed in the form of nodules in a matrix constituted by the polymer P2. The ophthalmic lens according to any of the preceding claims, characterized in that the polymer P1 has a hydrophobicity higher than that of the polymer P2. Ophthalmic lens according to any one of the preceding claims, characterized in that the polymers P1 and P2 are composed of: - 90 to 100% by weight of the reactants obtained by polymerization of at least one monomer chosen from group (I) consisting of alkyl (C) ? -C8) esters of (meth) acrylic acid, vinyl esters of linear or branched carboxylic acids, styrene, alkylstyrenes, haloalkylstyrenes, conjugated dienes, (meth) acrylamide, acrylonitrile, vinyl chloride, (meth) acrylic acids and their derivatives; and - 0 to 10% by weight of the reactants obtained by polymerization of at least one monomer chosen from group (II) consisting of allylic esters of α, β-unsaturated monocarboxylic or dicarboxylic acids, dienes, poly (meth) acrylates of polyols, polyvinylbenzenes and polyallyl derivatives. An ophthalmic lens according to claim 7, characterized in that: - for the polymer P1, the monomers are selected, by the monomers of group (I), from ethyl acrylate, butyl acrylate, butadiene, butyl methacrylate and methyl methacrylate. , by the monomers of group (II), between butanediol diacrylate-1,4, ß ^ g ^ butadiene, ethylene glycol diacrylate, diallyl maleate and allyl methacrylate, and for the polymer P2, the monomers are selected exclusively from the monomers of group (I), which comprises methyl methacrylate, butyl methacrylate and methacrylic acid . Ophthalmic lens according to any of the preceding claims, characterized in that the polymer P1 has a Tg of less than 0 ° C and the polymer P2 has a Tg of greater than 60 ° C. 1. Ophthalmic lens according to any of the preceding claims, characterized in that it comprises a single main layer on the rear main surface of the substrate. eleven . Ophthalmic lens according to any of claims 1-9, characterized in that it comprises a main layer on each of the main surfaces of the substrate. The ophthalmic lens according to any of the preceding claims, characterized in that it comprises an anti-reflection coating placed on the anti-abrasion coating. The ophthalmic lens according to any of the preceding claims, characterized in that the anti-abrasion coating is a polysiloxane coating. The ophthalmic lens according to claim 13, characterized in that the polysiloxane is obtained by curing a silane hydrolyzate containing an epoxysilino. 15. Ophthalmic lens according to claim 14, characterized in that the hydrolyzate contains silica particles. 16. Ophthalmic lens comprising an organic glass substrate having main, front and 5, at least one main layer placed on at least one of the main surfaces of the substrate, and at least one layer of anti-abrasion coating composition placed on the main layer, said main layer constituting a hydrophobic thermoplastic film which has no surface adhesive set 10 from 70 to 90% by weight of a mild polymer P1 having a glass transition temperature (Tg) of less than 20 ° C dispersed in 10 to 30% by weight of a hard polymer P2 having a temperature of vitreous transition (Tg) greater than 50 ° C, and said polymer P1 is dispersed in the form of individualized nodules in 15 the matrix constituted by the polymer P2. 17. The ophthalmic lens according to claim 1, characterized in that the polymer P1 is more hydrophobic than the polymer P2. iMÉMáilMUUÍÍili < ta __ ^ > > iÉTIMÍÍI ^^ - ^ - ^ > --- - ai ^ J || ^ li¿ glU