摘要:
Substitutes for optical glasses are obtained by submitting to polymerization, in the presence of a free-radical initiator and in bulk, a polymerizable liquid composition containing:a monomer of diethyleneglycol bis(allylcarbonate);oligomers of diethyleneglycol bis(alllycarbonate);a monomer of tris(hydroxyethyl)isocyanurate tris(allylcarbonate); andat least one free-radical initiator.
摘要:
A polymerizable liquid composition is disclosed, intended for preparing polymerizates having outstanding optical and physical properties, said composition consisting of a bis (allylcarbonate) of a dihydric alcohol oligomer, a bis (allylcarbonate) monomer of a dihydric or a trihydric alcohol, or an allyl ester, or a triallyl cyanurate or isocyanurate, and an acrylic or vinylic monomer, said composition being polymerized in bulk with the aid of at least one radicalic initiator. Highly transparent articles are obtained, which are very useful for fine optical applications.
摘要:
Organic glasses and surface coatings are prepared, with short hardening cycles, by submitting to the action of U.V. light a liquid polymerizable composition containing at least one di-(allyl carbonate) or poly(allyl carbonate) of a diol or polyol, a photoinitiator and a vinyl ester monomer and/or an organic peroxide.The composition can additionally contain small amounts of an organic compound selected from among those compounds which are used in the art in order to stabilize the organic polymers to the degrading action of U.V. light.The composition is preferably heated before being treated with U.V. light.
摘要:
A liqid composition polymerizable under the influence of free-radical initiators to yield crosslinked polymers useful as organic glasses endowed with high abrasion strength, contains an oligomer allyl-carbonate with two end allyl groups, a monomer allyl-carbonate with at least four end allyl groups and possibly also one or more reactive diluents containing groups of allyl, vinyl or methacryl type.
摘要:
A liquid composition comprising:(A) a monomeric, or essentially monomeric, diallyl-carbonate of a possibly halogenated diol containing aromatic groups; or a diallyl-ester of a halogenated aromatic bicarboxy acid;(B) a reactive monomer selected from diallyl orthophthalate, diallyl isophthalate, diallyl terephthalate, triallyl cyanurate and triallyl isocyanurate;(C) an oligomeric, or essentially oligomeric, diallyl-carbonate of diethylene glycolis polymerized under the action of a free-radical initiator, in order to yield optical articles having a high refractive index, low light dispersion, and with enhanced mechanical and color characteristics.
摘要:
A liquid, fluid composition, comprising:(a) bis(allylcarbonate) of monomer diethylene glycol;(b) bis(allylcarbonate) of oligomer diethylene glycol;(c) tris(allylcarbonate) of monomer tris(hydroxyethyl)isocyanurate;(d) a monofunctional, unsaturated vinyl or methacryl ester monomer,is polymerized inside a mould (casting process), with fast polymerization cycle, to yield optical articles.
摘要:
A liquid composition which can undergo radical polymerization to produce an almost colorless and easily dyeable organic glass, containing (i) at least one poly(allyl carbonate) of a polyhydroxy alcohol having from 2 to 20 carbon atoms and from 2 to 6 hydroxy groups in the molecule, and (ii) at least one aliphatic polyol having from 2 to 5 hydroxy groups in the molecule, in quantities from 0.01 to 1% by weight on the whole composition.
摘要:
A polymerizable liquid composition includesa polymerizable poly(allyl carbonate) of an aliphatic or cyclo-aliphatic polyol;an organic peroxide generator of free radicals selected from the group of perketals, and possiblyan organic dye and/or an organic photochromic compound.The compositions can be transformed, by bulk polymerization, into an organic glass which is colorless, or colored or photochromic, having good optical and mechanical characteristics.
摘要:
A liquid composition, polymerizable by means of a free-radical route to yield optical articles endowed with a high refractive index, contains an allyl-carbonate derivative definable with the general formula: (wherein R1, X1, X2, X3, X4, X5, X6, a and b are as defined in the disclosure) and a copolymerizable monomer containing at least one ethylenic unsaturation in its molecule.
摘要:
A liquid composition, polymerizable by free-radical polymerization to yield organic glasses which are endowed with characteristics of low water absorption and high thermal stability, is constituted by the product of transesterification of diallyl-carbonate with a cycloaliphatic diol or a mixture of cycloaliphatic diols, from among said diols 1,4-cyclohexane-di-methanol and 3(4),8(9)-bis-(hydroxymethyl)tricyclo[5.2.1.0.sup.2.6 ]decane being preferred.