Photochromic polyurethanes

Details Photochromic polyurethanes Photochromic polyurethanes

1998-12-16

2000-08-22

Niland, Patrick D.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524589, 524590, 528 44, C08J 300, C08K 320, C08K 535, C08L 7500, C08G 1800

Patent

active

061073954

ABSTRACT:
The present invention relates to a novel photochromic polyurethane consisting essentially of an isocyanate reactive mixture consisting essentially of: i) from about 40 to about 85% by weight of one or more polyols having a nominal functionality of from 2 to 4 and molecular weights of from 500 to 6000 g/mole; ii) from about 15 to about 60% by weight of one or more diols or triols or mixtures thereof having a functionality of from 2 to 3 and molecular weights of from 62 to 499; b) an aliphatic polyisocyanate having a functionality ranging from about 2 to about 3; and c) a photochromic compound selected from a group consisting of spirooxazines, fulgides, fulgimides, and naphthopyrans, wherein the photochromic compound is present in an amount of 0.01 to 5 parts per hundred parts by weight of the isocyanate reactive mixture.

REFERENCES:
patent: 4994208 (1991-02-01), McBain et al.
patent: 5200483 (1993-04-01), Selvig
patent: 5221721 (1993-06-01), Selvig
patent: 5244602 (1993-09-01), Van Gemert
patent: 5246630 (1993-09-01), Selvig
Database WPI, Sec. CH, Wk 9101 AN91-004400, XP-002099308 & JP02282242, Nov. 19, 1990.

Affiliated with

Also associated with

Rating

Photochromic polyurethanes does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photochromic polyurethanes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photochromic polyurethanes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-582037