To stabilize the dyeing property by using thiol groups and isocyanate groups in a specified molar ratio of functional groups and controlling the compounding amts. of thiol compds. and isocyanate compds. so as to obtain a specified range of changes in the molar ratio of the functional groups.
As for the monomers for polymn., thiol compds. containing thiol groups and isocyanate compds. containing isocyanate groups are used. The thiol groups and isocyanate groups are used in a specified molar ratio of the functional groups, and the thiol compds. and isocyanate compds. are used so as to obtain a specified range of changes in the molar ratio of the functional groups. Preferably, the specified molar ratio of the functional groups ranges 0.5 to 1.5 and the functional groups may be arbitrarily used in this range. First, the specified molar ratio of the functional groups is decided, and then the standard thiol value of the thiol compds. and the purity of the isocyanate compds. are determined. Based on the purity, the compounding amts. of both compds. are determined from the thiol value and the purity of isocyanate compds. in each lot.
IRYO TAKEAKI
NOZAWA YOSHINOSUKE
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