Claims
- 1. A curable composition for producing a hard coating of low refractive index consisting essentially of
- (a) about 30 to about 95% by weight of an unsaturated double bond-containing ester compound represented by the formula ##STR13## wherein R.sup.1 is a fluorine atom, X is (CH.sub.2).sub.p (wherein p is an integer of 1 to 3), ##STR14## (wherein Y is hydrogen atom or ##STR15## (q is an integer of 1 to 4 and r is an ##STR16## wherein R.sup.1 is fluorine atom, X is (CH.sub.2).sub.p (wherein p is an integer of 1 to 3), ##STR17## (wherein Y is hydrogen atom or ##STR18## (q is an integer of 1 to 4 and r is an integer of 0 to 3), and R.sup.2 is fluorine-containing alkyl group, alkenyl group or ether group, and
- (b) about 70 to about 5% by weight of a compound represented by the formula ##STR19## wherein R.sup.3 is hydrogen atom, fluorine atom, chlorine atom or methyl group, R.sup.4 is alkyl group, fluorine-containing alkyl group or cycloalkyl group, R.sup.5 is alkyl group having 1 to 4 carbon atoms, t is 0 or 1, m is an integer of 0 t 4, and n is an integer of 1 to 3.
- 2. The hard coating agent according to claim 1 which contains about 50 to about 90% by weight of the (a) compound and about 50 to about 10% by weight of the (b) compound, based on the combined amount of the (a) compound and the (b) compound.
- 3. The hard coating agent according to claim 1 which contains about 0.5 to about 10% by weight of the (c) photopolymerization initiator, based on the combined amount of the (a) compound and the (b) compound.
- 4. The hard coating agent according to claim 1 which contains about 1 to about 5% by weight of the (c) photopolymerization initiator, based on the combined amount of the (a) compound and the (b) compound.
- 5. The hard coating agent according to claim 1 wherein R.sup.2 in the compound of the formula (I) is fluorine-containing alkyl group having 1 to 20 carbon atoms.
- 6. The hard coating agent according to claim 1 wherein R.sup.3 in the compound of the formula (II) is fluorine atom or methyl group, R.sup.5 is alkyl group having 1 to 3 carbon atoms, t is 1 m is an integer of 1 to 4 and n is an integer of 1 to 3.
- 7. A hard coating agent of low refractive index comprising a copolymer prepared by copolymerizing an unsaturated double bond-containing ester compound having fluorine-containing organic group and an unsaturated double bond-containing compound having alkoxysilyl group, the copolymer consisting essentially of
- (a) about 30 to about 95% by weight of a structural unit represented by the formula ##STR20## wherein R.sup.1 is a fluorine atom, X is (CH.sub.2).sub.p (wherein p is an integer of 1 to 3), ##STR21## (wherein Y is hydrogen atom or ##STR22## (q is an integer of 1 to 4 and r is an integer of 0 to 3), and R.sup.2 is fluorine-containing alkyl group, alkenyl group or ether group, and
- (b) about 70 to about 5% by weight of a compound represented by the formula ##STR23## wherein R.sup.3 is hydrogen atom, fluorine atom, chlorine atom or methyl group, R.sup.4 is alkyl group, fluorine-containing alkyl group or cycloalkyl group, R.sup.5 is alkyl group having 1 to 4 carbon atoms, t is 0 or 1, m is an integer of 0 to 4, and n is an integer of 1 to 3.
- 8. The hard coating agent according to claim 7 wherein the copolymer has a number average molecular weight of about 10000 or more.
- 9. The hard coating agent according to claim 8 wherein the copolymer has a number average molecular weight of about 50000 to about 5000000.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-21611 |
Feb 1988 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/301,587 filed Jan. 26, 1989 now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2038418 |
Feb 1987 |
JPX |
2-169018 |
Jun 1990 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
301587 |
Jan 1989 |
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