Claims
- 1. A cross-linkable polymeric casting composition that comprises:
- A: an acrylic or methacrylic monomer that is selected from an acrylate or a methacrylate derivatives of a cycloolefin which provides high rigidity and low colour dispersion and is characterized by an Abbe number of at least 35 in the final product;
- B. a di- or polythiol compound;
- C. a di- or polyvinyl monomer; optionally
- D. a polymerisable comonomer; and
- E: a heat and/or UV curing agent.
- 2. A cross-linkable polymeric casting composition according to claim 1, wherein the acrylate or methacrylate derivative is of the formula ##STR35## where R can be H or CH.sub.3
- a=1-3, b=1-3, m=0-6, n=0-6.
- S is a spacer group selected from one or more of the following ##STR36## wherein p=1-4.
- 3. A cross-linkable polymeric casting composition according to claim 2 wherein the acrylate or methacrylate derivative is a tricyclodecane dimethanol acrylate of the following formula ##STR37##
- 4. A cross-linkable polymeric casting composition according to claim 1 wherein component A is present in amounts of from approximately 20 to 60% by weight based on the total weight of the casting composition.
- 5. A cross-linkable polymeric casting composition according to claim 4, wherein component A is present in amounts of from approximately 30 to 55% by weight, based on the total weight of the casting composition.
- 6. A cross-linkable polymeric casting composition according to claim 1, wherein component B is a di-, tri- or tetra- polythiol compound.
- 7. A cross-linkable polymeric casting composition according to claim 6, wherein the polythiol is selected from one or more of the following: (a) 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol [MDO] ##STR38## (b) Trimethylolpropane Tris (3-mercaptopropionate) [TTMP] ##STR39## (c) Pentaerythritol Tetrakis (3-mercaptoacetate) [PTMA] ##STR40## (d) Trimethylolpropane Tris (3-mercaptoacetate) [TTMA] ##STR41## (e) 4-t-butyl-1,2-benzenedithiol ##STR42## (f) Bis(2-mercaptoethyl)sulfide HSCH.sub.2 CH.sub.2 SCH.sub.2 CH.sub.2 SH
- (g) 4,4'-thiodibenzenethiol ##STR43## (h) benzenedithiol ##STR44## (i) Glycol Dimercaptoacetate ##STR45## (j) Glycol Dimercaptopropionate Ethylene bis(3-Mercaptopropionate) ##STR46## (k) Polyethylene Glycol Dimercaptoacetates ##STR47## (l) Polyethylene Glycol Di(3-Mercaptopropionate) ##STR48## (m) Pentaerythritol Tetrakis (3-mercapto-propionate) [PTMP] ##STR49## (n) Mercapto-methyl tetrahydrothiophene [MMTHT] ##STR50## (o) Tris-(3-mercaptopropyl)isocyanurate [TMPIC] ##STR51## (p) 2-mercaptoethyl sulphide HSCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 SH
- (q) 1,2,3-trimercaptopropane ##STR52## (r) 2,2-bis(mercaptomethyl)-1,3-propanedithiol C(CH.sub.2 SH).sub.4
- (s) Dipentaerythrithiol
- O[C(CH.sub.2 SH).sub.3 ].sub.2
- (t) 1,2,4-trimercaptomethyl benzene ##STR53## (u) 2,5-dimercaptomethyl-1,4-dithiane ##STR54## (v) BPHE-SH ##STR55## (w) 4,8-bis(mercaptomethyl)-3,6,9-trithia-1,11-undecanedithiol ##STR56## (x) 2-mercaptomethyl-2-methyl-1,3-propanedithiol H.sub.3 CC(CH.sub.2 SH).sub.3
- (y) DMDO: 1,8-dimercapto-3,6-dioxaoctane
- HSCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 SH.
- 8. A cross-linkable polymeric casting composition according to claim 7 wherein the polythiol is 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol [MDO].
- 9. A cross-linkable polymeric casting composition according to claim 7, wherein component B is present in amounts of from approximately 15 to 60% by weight, based on the total weight of the casting composition.
- 10. A cross-linkable polymeric casting composition according to claim 9, wherein component B is present in amounts of from approximately 20 to 55% by weight, based on the total weight of the casting composition.
Priority Claims (2)
Number |
Date |
Country |
Kind |
PN 3234 |
May 1995 |
AUX |
|
PN 7263 |
Dec 1995 |
AUX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional of application Ser. No. 08/975,105, filed Nov. 20. 1997, now U.S. Pat. No. 5,977,276.
This application is a continuation-in-part and claims benefit of International Application No. PCT/AU96/00314, which designates the United States, with an international filing date of May 24, 1996, which claims priority of Australian Patent Application No. PN 3234 filed May 30, 1995 and Australian Patent Application No. 7263 filed Dec. 22, 1995 and are incorporated herein by reference.
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Number |
Name |
Date |
Kind |
4131729 |
Schmitt et al. |
Dec 1978 |
|
5502139 |
Toh et al. |
Mar 1996 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
4408989 |
May 1990 |
AUX |
5058193 |
May 1994 |
AUX |
Non-Patent Literature Citations (4)
Entry |
Derwent Abstract Accession No. 95-118718/16, Class A14, JP, A, 07041520. |
Derwent Abstract Accession No. 93-131324/16, Class P81, JP, A, 05070524. |
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Derwent Abstract Accession No. 94-186824/23, Class P81, JP, A, 06123855. |
Divisions (1)
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Number |
Date |
Country |
Parent |
975105 |
Nov 1997 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
PCTAU9600314 |
May 1996 |
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