TECHNICAL FIELD
[0001] The present disclosure relates to a polythiol composition, a polymerizable
composition, a resin, a molded article, an optical material, and a lens.
BACKGROUND ART
[0002] Plastic lenses are lightweight and difficult to crack compared to inorganic lenses, and
are capable of dyeing, and are therefore rapidly becoming popular in optical elements such as
spectacle lenses and camera lenses in recent years.
[0003] Further higher performance has been required for plastic lens resins, and high
refractive index, high Abbe's number, low specific gravity, high heat resistance, and the like
have been required. A variety of lens resin materials have also been developed and used.
[0004] For example, patent document 1 describes a mercapto compound represented by a
specific structural formula.
For example, patent document 2 describes a method of producing a polythiol
compound, including the steps of: reacting 2-mercaptoethanol with an epihalohydrin
compound represented by a specific formula (1) under a temperature of 10 to 50°C to obtain a
polyalcohol compound represented by a specific formula (2); reacting the resulting
polyalcohol compound represented by formula (2) with thiourea in the presence of hydrogen
chloride to obtain an isothiuronium salt; adding aqueous ammonia solution to the resulting
isothiuronium salt-containing reaction liquid within 80 minutes while maintaining the reaction
liquid at a temperature of 15 to 60°C to hydrolyze the isothiuronium salt to obtain a polythiol
compound represented by a specific formula (5); and adding hydrochloric acid at a
concentration of 25 to 36% to the resulting polythiol compound-containing solution, carrying
out washing at a temperature of 10 to 50°C, and purifying the polythiol compound.
[0005] Patent Document 1: JP H02-270859 A
Patent Document 2: WO2014/027427A1
SUMMARY OF INVENTION
Technical Problem
2
[0006] A resin obtained by curing a polymerizable composition including a polythiol
compound may be required to have good dyeability.
[0007] A problem to be solved by an embodiment of the present disclosure is to provide a
polythiol composition capable of producing a resin having excellent dyeability.
Solution to Problem
[0008] Means for solving the problem include the following embodiments.
<1> A polythiol composition, comprising: a polythiol compound (A); and a compound
represented by the following formula (1):
[0009]
[0010] wherein, in formula (1), m and n each independently represent 0 or 1, and m + n = 1.
<2> The polythiol composition according to <1>, wherein the polythiol compound (A)
comprises a polythiol compound obtained from epichlorohydrin, 2-mercaptoethanol, and
thiourea as raw materials.
<3> The polythiol composition according to <1> or <2>, wherein the polythiol compound
(A) comprises 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, or comprises a mixture of
5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-
dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-
trithiaundecane.
<4> The polythiol composition according to any one of <1> to <3>, comprising: a
polythiol compound (A) comprising 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane; and
a compound represented by the following formula (1):
[0011]
3
[0012] wherein, in formula (1), m and n each independently represent 0 or 1, and m + n = 1.
<5> The polythiol composition according to any one of <1> to <4>, wherein, in a highperformance liquid chromatography measurement, a peak area of the compound represented
by formula (1) is 10.0 or less with respect to a total peak area 100 of compounds included in
the polythiol composition.

CLAIMS
Claim 1. A polythiol composition, comprising: a polythiol compound (A); and a compound
represented by the following formula (1):
wherein, in formula (1), m and n each independently represent 0 or 1, and m + n = 1.
Claim 2. The polythiol composition according to claim 1, wherein the polythiol compound
(A) comprises a polythiol compound obtained from epichlorohydrin, 2-mercaptoethanol, and
thiourea as raw materials.
Claim 3. The polythiol composition according to claim 1 or 2, wherein the polythiol
compound (A) comprises 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, or comprises a
mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-
dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-
dimercapto-3,6,9-trithiaundecane.
Claim 4. The polythiol composition according to any one of claims 1 to 3, comprising: a
polythiol compound (A) comprising 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane; and
a compound represented by the following formula (1):
wherein, in formula (1), m and n each independently represent 0 or 1, and m + n = 1.
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Claim 5. The polythiol composition according to any one of claims 1 to 4, wherein, in a
high-performance liquid chromatography measurement, a peak area of the compound
represented by formula (1) is 10.0 or less with respect to a total peak area 100 of compounds
included in the polythiol composition.
Claim 6. The polythiol composition according to any one of claims 1 to 5, wherein, in a
high-performance liquid chromatography measurement, a peak area of the compound
represented by formula (1) is greater than 0 with respect to a total peak area 100 of
compounds included in the polythiol composition.