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...
Patent
1995-06-07
1997-01-14
Cain, Edward J.
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...
351160R, 524127, 524130, 524131, 524265, 524462, 524463, 528 67, 528 79, 528 80, 528 81, C08G 1832
Patent
active
055940889
ABSTRACT:
One aspect of the present invention relates to a process for preparing plastic lenses having a high-refractive index comprising forming a mixture containing one or more polyisocyanate compounds; one or more active hydrogen compounds selected from the group consisting of a polyol compound having no sulfur atom, a polyol compound having at least one sulfur atom, and a polythiol compound having at least one sulfur atom in addition to the sulfur atom contained in mercapto group and at least one internal releasing agent and then casting and polymerizing the mixture.
A second aspect of the present invention relates to a process for preparing a sulfur-containing urethane resin lens is here disclosed which comprises mixing polyisocyanate having two or more isocyanato groups, polythiol having two or more thiol groups and one or more surface active agent selected from the group consisting of fluorine-containing nonionic surface active agents, silicone-containing nonionic surface active agents, alkyl quaternary ammonium salts and acid phosphoric esters and then cast polymerizing the mixture in a mold made of a glass or a metal. Lenses prepared by the processes are also disclosed.
REFERENCES:
patent: 4220727 (1980-09-01), Godlewski
patent: 4594402 (1986-06-01), Coleman et al.
patent: 4728690 (1988-03-01), Lammerting et al.
patent: 4775733 (1988-10-01), Kanemura et al.
Imai Masao
Kajimoto Nobuyuki
Kanemura Yoshinobu
Miura Tohru
Nagata Teruyuki
Cain Edward J.
Mitsui Toatsu Chemicals Inc.
LandOfFree
Plastic lenses having a high-refractive index, process for the p does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Plastic lenses having a high-refractive index, process for the p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Plastic lenses having a high-refractive index, process for the p will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1389038