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Multivalent mercaptan – Asahi Chemical Co. Ltd.


Polyvalent mercaptans are characterized by their ability to contribute to photo-curing and thermo-curing reactions.

Using this feature, it is anticipated that they will find applications in highly refractive resins, coating materials, adhesives, paints, etc.
In addition, mercaptans are widely used as chain transfer agents in radical polymerization, curing agents for epoxy resins, cleaning agents for electronic parts, and thin copper film manufacturing. It is expected that they will become even more sophisticated, with more applications in the future.

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Description

  1. G-2S(A) CAS No. 584-04-3
  2. PE-2S CAS No. 19333-66-5
  3. PE-3S CAS No. 500283-12-5
  4. PE-4S CAS No. 4720-60-9
  5. TMP-3S CAS No. 121318-18-1

In addition to having 2 to 4 mercapto groups, these have various other characteristics, such as having 1 or 2 hydroxyl groups (① to ③) and having a significantly high sulfur content (①52%, ③52%, ④64%, ⑤53%) … and there are many others. Therefore, such qualities are anticipated to modify the substance’s character by enhancing the hydroxyl group: high refractive index, high heat resistance, transparency, and flexibility.
These are all 97% or more pure.
They have little or no odor.
①, ③ are liquids, ②, ④, ⑤ are solids.
Both are stored in a nitrogen atmosphere.
Solubility varies depending on the compound, but it is usually slightly soluble or difficult to dissolve in water, is soluble in ether, and easily soluble in alcohol, toluene, and hexane.

Compound namePropertySolubility information
G-2S(A)
1,3-Dimercapto-2-propanol
Transparent colorless to pale yellow liquid
Refractive index 1.566
Heptane× Insoluble
Toluene
Ethyl acetate
Ethyl cellosolve
Methanol
Water×5% Dissolves
PE-2S
2,2-Bis(mercaptomethyl)-1,3-propanediol
White solid
Melting point 95 ˚C
Heptane×
Toluene×
Ethyl acetate
Ethyl cellosolve
Methanol
Water×
PE-3S
3-mercapto-2,2-bis(mercaptomethyl)-1-propanol
Colorless to slightly yellow solid
Melting point 35 ˚C
Heptane×
Toluene
Ethyl acetate
Ethyl cellosolve
Methanol
Water×
PE-4S
2,2-Bis(mercaptomethyl)-1,3-propanedithiol
Colorless to slightly yellow solid
Melting point 71 ˚C
Heptane
Toluene
Ethyl acetate
Ethyl cellosolve
Methanol×
Water×
TMP-3S
2-Ethyl-2-(mercaptomethyl)-1,3-Propanedithiol
Colorless to slightly yellow solid
Melting point 45 ˚C
Heptane
Toluene
Ethyl acetate
Ethyl cellosolve
Methanol
Water×

At 25 ˚C ◎: 50% (wt/wt) ○: 25% or more (wt/wt) △: 10% or more (wt/wt) ×: 5% or less (wt/wt)

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Multivalent mercaptans Catalog

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