US5087758A
Expired / Lapsed
US
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Mercapto compound, a high refractive index resin and lens and a process for preparing them
Assignee: Mitsui Chemicals Inc
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Filing: 1989-08-29
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Granted: 1992-02-11
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Expires: 2009-08-29
Abstract
Abstract The present invention relates to a mercapto compound, a process for preparing the mercapto compound, a process for preparing a polythiourethane base resin containing the mercapto compound, and a process for preparing plastic lenses containing the resin.
Inventors
- 👤 Yoshinobu Kanemura
- 👤 Katsuyoshi Sasagawa
- 👤 Masao Imai
- 👤 Toshiyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:44
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3876; C07; C07C; C07C321/00; C07C321/12; C07C321/14; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
8 words
A mercapto compound of the formula (I) ##STR23##
Claim 2
Dependent Claim
8 words
A mercapto compound of the formula (I) ##STR23##
Claim 3
Dependent Claim
50 words
A process for preparing the mercapto compound of the formula (I) ##STR24## comprising reacting thiourea and a triol compound of the formula (II) ##STR25## in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 4
Dependent Claim
50 words
A process for preparing the mercapto compound of the formula (I) ##STR24## comprising reacting thiourea and a triol compound of the formula (II) ##STR25## in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 5
Dependent Claim
50 words
A process for preparing the mercapto compound of the formula (I) ##STR26## comprising reacting thiourea and a triol compound of the formula (III) ##STR27## in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 6
Dependent Claim
50 words
A process for preparing the mercapto compound of the formula (I) ##STR26## comprising reacting thiourea and a triol compound of the formula (III) ##STR27## in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 7
Dependent Claim
64 words
A process for preparing the mercapto compound of formula (I) ##STR28## comprising obtaining the triol compound of formula (II) ##STR29## by reacting epihalohydrin with 2-mercapto ethanol in the presence of a base, reacting the triol compound with thiourea in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 8
Dependent Claim
64 words
A process for preparing the mercapto compound of formula (I) ##STR28## comprising obtaining the triol compound of formula (II) ##STR29## by reacting epihalohydrin with 2-mercapto ethanol in the presence of a base, reacting the triol compound with thiourea in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 9
Dependent Claim
10 words
The process of claim 4 wherein the epihalohydrin is epichlorohydrin.
Claim 10
Dependent Claim
68 words
A process for preparing the mercapto compound of the formula (I) ##STR30## comprising obtaining a mixture of triol compounds of the formula (II) and (III) ##STR31## by reacting 2,3-dihalogeno-1-propanol with 2-mercaptoethanol in the presence of a base, reacting the mixture with thiourea in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 11
Dependent Claim
68 words
A process for preparing the mercapto compound of the formula (I) ##STR30## comprising obtaining a mixture of triol compounds of the formula (II) and (III) ##STR31## by reacting 2,3-dihalogeno-1-propanol with 2-mercaptoethanol in the presence of a base, reacting the mixture with thiourea in the presence of a mineral acid to form a reaction mixture, and adding a base to hydrolyze the reaction mixture to form the mercapto compound.
Claim 12
Dependent Claim
10 words
The process of claim 6 wherein the 2,3-dihalogeno-1-propanol is 2,3-dibromo-1-propanol.
Claim 13
Dependent Claim
92 words
A process for preparing the mercapto compound of the formula (I) claimed in claim 5 comprising reacting one chemical equivalent of epichlorohydrin with one to three chemical equivalent of 2-mercaptoethanol in the presence of 0.001 to 0.1 chemical equivalent of a base to form a diol of formula (IV) ##STR32## reacting the diol with 2-mercaptoethanol which is increased to reach totally to two to three chemical equivalent and a base which is increased to reach totally to one to two chemical equivalent in alkaline pH to form the triol of formula (II).
Claim 14
Dependent Claim
12 words
A process of claim 8 wherein the mineral acid is hydrochloric acid.
Claim 15
Dependent Claim
22 words
A process of claim 8 wherein the base is added to the reaction mixture at a temperature of 0° to 50° C.
Claim 16
Dependent Claim
23 words
The process of claim 8 wherein forming the diol of formula (IV) is carried out at a temperature of 0° to 50° C.
Claim 17
Dependent Claim
12 words
A process of claim 2 wherein the mineral acid is hydrochloric acid.
Claim 18
Dependent Claim
12 words
A process of claim 3 wherein the mineral acid is hydrochloric acid.
Claim 19
Dependent Claim
12 words
A process of claim 4 wherein the mineral acid is hydrochloric acid.
Claim 20
Dependent Claim
12 words
A process of claim 6 wherein the mineral acid is hydrochloric acid.
Claim 21
Dependent Claim
22 words
A process of claim 2 wherein the base is added to the reaction mixture at a temperature of 0° to 50° C.
Claim 22
Dependent Claim
22 words
A process of claim 3 wherein the base is added to the reaction mixture at a temperature of 0° to 50° C.
Claim 23
Dependent Claim
22 words
A process of claim 4 wherein the base is added to the reaction mixture at a temperature of 0° to 50° C.
Claim 24
Dependent Claim
22 words
A process of claim 6 wherein the base is added to the reaction mixture at a temperature of 0° to 50° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |