Claims
- 1. A plastic lens comprising a polymer (B) containing a dimethallyl phthalate (A) as a major component and having a refractive index of not less than 1.55, wherein the polymer (B) is a colorless copolymer comprising 70 to 99% by weight of a dimethallyl phthalate and 30 to 1% by weight of one or more monomers (C.sub.1) represented by the general formula ##STR5## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or methyl group and m and n each represent an integer from 0 to 3.
- 2. A plastic lens according to claim 1, wherein the dimethallyl phthalate (A) is dimethallyl o-phthalate.
- 3. A plastic lens according to claim 1, wherein the monomer (C.sub.1) is phenoxyethyl methacrylate.
- 4. A plastic lens according to claim 1, which has a visible light transmission of 90% or above, a pencil test hardness of 4H or above, is colorless, and excellent in processability and dyeability.
- 5. A method for manufacturing a plastic lens of high refractive index, which comprises a step of prepolymerizing dimethallyl phthalate (A) in the presence of a radical polymerization initiator to a point at which the refractive index (n.sub.D at 20.degree. C.) still remains below 1.520, and a succeeding step of pouring into a lens mold a mixture comprising the prepolymerizate (D) obtained in the preceding step, one or more monomers (C.sub.1) represented by the general formula ##STR6## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or methyl group and m and n each represent an integer from 0 to 3, and a radical polymerization initiator to allow the mixture to polymerize therein, whereby a colorless copolymer comprising 70 to 99% by weight of the prepolymerizate and 30 to 1% by weight of the monomers is formed.
- 6. A method for manufacturing a plastic lens according to claim 5, wherein a mixture comprising 70-99 parts by weight of the prepolymerizate (D), 30-1 parts by weight of the monomer or monomers (C.sub.1) represented by the general formula (1), and 0.1-5 parts by weight of the radical polymerization initiator is used in the latter step.
- 7. A plastic lens, comprising a polymer (B) containing a dimethallyl phthalate (A) as a major component and having a refractive index of not less than 1.55, wherein the polymer (B) is a colorless copolymer comprising 70 to 99% by weight of the dimethallyl phthalate (A) and 30 to 1% by weight of one or more monomers (C.sub.2) represented by the general formula ##STR7## wherein R.sub.3 and R.sub.4 each represent a hydrogen atom or methyl group and n represents an integer of from 2 to 9.
- 8. A plastic lens according to claim 7, which has a visible light transmission of at least 90%, a pencil test hardness of 4H or above, is colorless, and excellent in processability and dyeability.
- 9. A method for manufacturing a plastic lens of high refractive index, which comprises a step of prepolymerizing dimethallyl phthalate (A) in the presence of a radical polymerization initiator to a point at which the refractive index (n.sub.D at 20.degree. C.) still remains below 1.520, and a succeeding step of pouring into a lens mold a mixture comprising the prepolymerizate (D) obtained in the preceding step, one or more monomers (C.sub.2) represented by the general formula ##STR8## wherein R.sub.3 and R.sub.4 each represent a hydrogen atom or methyl group and n represents an integer of from 2 to 9, and a radical polymerization initiator to allow the mixture to polymerize therein, whereby a colorless copolymer comprising 70 to 99% by weight of the prepolymerizate and 30 to 1% of the monomers is formed.
- 10. A method for manufacturing a plastic lens according to claim 9, wherein a mixture comprising 70-99 parts by weight of the prepolymerizate (D), 30-1 parts by weight of the monomer or monomers (C.sub.2) represented by the general formula (2), and 0.1-5 parts by weight of the radical polymerization initiator is used in the latter step.
Priority Claims (2)
Number |
Date |
Country |
Kind |
59-14136 |
Jan 1984 |
JPX |
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59-20397 |
Sep 1984 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 693,042, filed on Jan. 22, 1985, now abandoned.
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2631141 |
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4393184 |
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4522993 |
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Jun 1985 |
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Foreign Referenced Citations (5)
Number |
Date |
Country |
58-201812 |
Oct 1982 |
JPX |
59-8709 |
Jan 1984 |
JPX |
59-081318 |
May 1984 |
JPX |
59-96113 |
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JPX |
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GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
693042 |
Jan 1985 |
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