High refractive index plastic base on an alkylthiol and an alkyl

Details High refractive index plastic base on an alkylthiol and an alkyl High refractive index plastic base on an alkylthiol and an alkyl

1993-10-12

1995-06-06

Henderson, Christopher

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

Synthetic resins

From sulfur-containing reactant

351159, 526289, C08G 7504, C08F22800

Patent

active

054224225

ABSTRACT:
The invention relates to a high refractive index plastic produced by reaction of an alkylthiol with a multiply unsaturated monomer, wherein said alkylthiol (A) has at least 2, and up to 20 carbon atoms in the alkyl group, and contains at least 2 thiol groups in the molecule, is reacted with an alkylpolythiol ester (B) having at least 2, and up to 24, preferably up to 12, carbon atoms in the alkyl group, which ester contains at least 2 thiol groups esterified with (meth)acrylic acid in the molecule, said reaction being under conditions of radical polymerization, with the limitation that the numerical ratio of the mercapto groups to the available double bonds is .ltoreq.1, preferably <0.5.

REFERENCES:
patent: 5270439 (1993-12-01), Maruyama
patent: 5294690 (1994-03-01), Iguchi

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