Polymerizable compositions for making thio containing resins...

Details Polymerizable compositions for making thio containing resins... Polymerizable compositions for making thio containing resins...

2005-01-18

2005-01-18

Truong, Duc (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C528S044000, C528S085000, C528S373000, C528S388000

Reexamination Certificate

active

06844415

ABSTRACT:
The polymerizable compositions comprise:A) at least one polyiso(thio)cyanate monomer, and at least one polythiol monomer; or at least one episulfide compound and optionally one or more compounds having two or more functional groups capable of reacting with episulfide groups; andB) as polymerization catalyst, an effective amount of a salt of formulain-line-formulae description="In-line Formulae" end="lead"?MmP+Yn−in-line-formulae description="In-line Formulae" end="tail"?Y−is an anion such as the corresponding acid YH has a pKa fulfilling the condition 0.5≦pKa≦14 with the proviso that when the polymerizable compositions comprise an episulfide compound and MP+is an ammonium group, the polymerizable composition also comprises an electro-donor compound.Application to the fabrication of optical articles, such as lenses.

REFERENCES:
patent: 5973098 (1999-10-01), Keita et al.

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