Claims
- 1. A liquid polymerizable composition of allylcarbonates, suitable to be converted into optical articles by a casting technique with fast polymerization cycle, comprising:
- (a) from about 10% by weight to about 35% by weight of a reaction product consisting of at least about 80% by weight of bis(allycarbonate) of diethylene glycol, the balance of said reaction product consisting substantially of oligomers of bis(allycarbonate) of diethylene glycol, said reaction product formed by reaction of diallycarbonate with diethylene glycol in a molar ratio of about 10:1;
- (b) from about 25% by weight to about 50% by weight of a bis(allylcarbonate) of oligomer diethylene glycol of the formula: ##STR5## wherein R is a radical of diethylene glycol, and n has an average value of about 3, said bis(allylcarbonate) of oligomer diethylene glycol formed by reaction of diallycarbonate with diethylene glycol in a molar ratio of about 2:1;
- (c) from about 20% by weight to about 35% by weight of a reaction product consisting of at least about 60% by weight of tris(hydroxyethyl)isocyanurate tris(allylcarbonate), the balance of said reaction product consisting substantially of oligomers of tris(hydroxyethyl)isocyanurate tris(allycarbonate), said reaction product formed by reaction of diallycarbonate with tris(hydroxyethyl)isocyanurate in a molar ratio of about 10:1; and
- (d) from about 5% by weight to about 20% by weight of a monofunctional, unsaturated monomer selected from vinyl acetate and methyl methacrylate;
- the composition further comprising a free-radical polymerization initiator, in an amount of from about 2% by weight to about 5% by weight, relative to the total of the weights of the components of (a), (b), (c) and (d).
- 2. Composition according to claim 1, characterized in that the free-radical initiator is selected from diisopropylperooxydicarbonate, dicyclohexylperoxydicarbonate, di-sec-butylperoxydicarbonate, di-benzoylperoxide and tert-butylperbenzoate.
- 3. Composition according to clim 1, characterized in that it additionally contains one or more among stabilizers, release agents, dyes, pigments, UV-light or IR-light absorbers, in a total amount not higher than 1% by weight relatively to the total of the weights of (A), (B), (C) and (D) components.
- 4. Process for the preparation of optical articles characterized in that the composition according to any of claims 1, 2, or 3 is polymerized in a mould, at a temperature of from 40.degree. to 100.degree. C. for a time of from 1 to 5 hours.
Priority Claims (1)
Number |
Date |
Country |
Kind |
23289 A/85 |
Dec 1985 |
ITX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 942,381, filed on Dec. 16, 1956, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
56-61412 |
May 1981 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
942381 |
Dec 1986 |
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