EP0453149A2
Expired / Lapsed
EP
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Casting composition
Assignee: Carl Zeiss Vision Australia Holdings Ltd
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Filing: 1991-04-08
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Granted: —
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Expires: 2011-04-08
Abstract
Abstract A cross-linkable polymeric casting composition including A) a polyoxy alkylene glycol diacrylate or dimethacrylate; B) a monomer having a recurring unit derived from at least one radical-polymerisable bisphenol monomer capable of forming a homopolymer having a refractive index of more than 1.55; and C) a urethane monomer having 2 to 6 terminal groups selected from a group comprising acrylic and methacrylic groups.
Inventors
- 👤 Huan Kiak Toh
- 👤 Chong Meng Kok
- 👤 Michael Pittolo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 02:35
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; C; C08; C08F; C08F222/00; C08F222/10; C08F222/1006; C08F222/102; C08F222/1025; C08F222/106; C08F222/1065
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
70 words
A cross-linkable polymeric casting composition characterised in that the composition includes: as Component (A), a polyoxyalkylene glycol diacrylate or dimethacrylate; as Component (B), a monomer having a recurring unit derived from at least one radical-polymerisable bisphenol monomer capable of forming a homopolymer having a refractive index of more than 1.55; and as Component (C), a urethane monomer having 2 to 6 terminal groups selected from acrylic groups and methacrylic groups.
Claim 2
Dependent Claim
22 words
A casting composition according to claim 1, in which Component (A) has ethylene oxide or propylene oxide repeating units in its backbone.
Claim 3
Dependent Claim
18 words
A casting composition according to claim 1 or 2, in which Component (A) is derived from ethylene glycol.
Claim 4
Dependent Claim
22 words
A casting composition according to claim 1 or 2, in which Component (A) has from 6 to 14 alkylene oxide repeating units.
Claim 5
Dependent Claim
19 words
A casting composition according to claim 1, 2 or 3, in which Component (A) is a polyethylene glycol dimethacrylate.
Claim 6
Dependent Claim
48 words
A casting composition according to any preceding claim, in which Component (A) further comprises a polyethylene glycol dimethacrylate having an average number of 3 to 5 ethylene oxide units, in amounts of from approximately 5 to 30% by weight, based on the total weight of the casting composition.
Claim 7
Dependent Claim
36 words
A casting composition according to any preceding claim, in which Component (A) is present in an amount of from approximately 5% by weight to 60% by weight, based on the total weight of the casting composition.
Claim 8
Dependent Claim
22 words
A casting composition according to any preceding claim, in which Component (B) is a polyacrylate or polymethacrylate ester of a bisphenol compound.
Claim 9
Dependent Claim
69 words
A casting composition according to claim 8, in which Component (B) is selected from compounds having a general formula represented by: wherein R¹ is methyl, ethyl or hydrogen; R² is hydrogen, methyl or ethyl; R³ is hydrogen, methyl or hydroxyl; R⁴ is hydrogen, methyl or ethyl; X is a halogen, preferably chlorine, bromine or iodine, or hydrogen; and n is an integer having a value of 0 to 8.
Claim 10
Dependent Claim
16 words
A casting composition according to claim 9, in which Component (B) is bisphenol A ethoxylated dimethacrylate.
Claim 11
Dependent Claim
13 words
A casting composition according to claim 9, in which Component (B) is halogenated.
Claim 12
Dependent Claim
34 words
A casting composition according to any preceding claim, in which Component (B) is present in an amount of from approximately 10 to 60% by weight, based on the total weight of the casting composition.
Claim 13
Dependent Claim
65 words
A casting composition according to any preceding claim, in which Component (B) further comprises a secondary high index monomer other than a high index bisphenol monomer to modify overall refractive index of the optical article formed therefrom, the secondary high index monomer component being present in an amount of from 0 to approximately 20% by weight based on the total weight of the casting composition.
Claim 14
Dependent Claim
35 words
A casting composition according to any preceding claim, in which Component (C) is selected from urethane monomers whose molecular weight divided by the functionality or number of groups lies in the range 100 - 300.
Claim 15
Dependent Claim
24 words
A casting composition according to claim 13, wherein Component (C) may function in addition as at least part of the secondary high index monomer.
Claim 16
Dependent Claim
120 words
A casting composition according to any one of claims 1 to 13, in which Component (C) is a tetracrylic urethane monomer selected from compounds having a general formula represented by: wherein R, R¹ , R² and R³ which may be the same or different are selected from hydrogen, alkyl of 1 to 6 carbon atoms or a substituted alkyl of 1 to 6 carbon atoms; and X is an organic residue having 1 to 20 carbon atoms, preferably an aliphatic, alicyclic or aromatic residue, more preferably a C₁-C₂₀ alkyl, alkoxy, alkylamino, alkyl carbonyl, alkoxy carbonyl, alkylamido, alkoxy amide group, an organic diisocyanate and members of this group substituted with one or more halogen, hydroxyl, nitro, amino, alkyl or alkoxy groups.
Claim 17
Dependent Claim
35 words
A casting composition according to any preceding claim, in which Component (C) is present in an amount of from approximately 2.5 to approximately 20% by weight, based on the total weight of the casting composition.
Claim 18
Dependent Claim
35 words
A casting composition according to any preceding claim, further comprising a poly-functional unsaturated cross-linking agent, in an amount of from approximately 5 to 20% by weight, based on the total weight of the casting composition.
Claim 19
Dependent Claim
26 words
A casting composition according to any preceding claim, further comprising a cross-linking initiator selected from heat initiators, ultraviolet initiators and combinations of heat and ultraviolet initiators.
Claim 20
Dependent Claim
23 words
A casting composition according to any preceding claim, further comprising from 1 to 10% by weight of an aliphatic glycol dimethacrylate or diacrylate.
Claim 21
Dependent Claim
35 words
A polymeric optical article formed from a casting composition as claimed in any one of claims 1 to 21 and having a refractive index in the mid refractive range of from approximately 1.51 to 1.57.
References Cited (Backward Citations)
No citation records indexed.
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