Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1991-03-01
1994-03-01
Berman, Susan
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
522 96, 522 97, 522149, 522 90, 430913, 430927, G03C 173, G03F 7027, C08G 1834
Patent
active
052906639
ABSTRACT:
A photopolymer useful in preparing water-developable, solid printing plates is prepared by (A) preparing a urethane prepolymer by reacting a polyoxyalkylene diol (optionally carboxylic acid grafted) with an excess of diisocyanate, followed by chain extending the resulting prepolymer mixture with a dialkylolpropionic acid and preferably with additional diols(s) such as alkane diol(s) and (meth)acrylate-containing diol(s). Use of a new (meth)acrylate-containing diol in such chain extension completes the formation of photopolymer. However, in a third operation (B) hydroxyalkylmethacrylate may be reacted with the result of (A) whether or not (meth)acrylate-containing diol is used in (A). The carboxylic acid groups of the photopolymer may also be partially neutralized with a base. The photopolymer is suitably formulated with additional photoactive (meth)acrylate monomers or oligomers and photoinitiator for casting on a substrate or extruding to form a flexographic printing plate. Following UV exposure of the plate through a negative, unexposed areas can be removed by washing with an aqueous alkaline solution to give a plate with a desirable relief image. The use of the aqueous alkaline washout solution as opposed to organic solvents minimizes pollution problems.
REFERENCES:
patent: 2760863 (1956-08-01), Plambeck, Jr.
patent: 3891523 (1975-06-01), Hisamatsu et al.
patent: 3932356 (1976-01-01), Takagi
patent: 4023973 (1975-04-01), Imaizumi et al.
patent: 4460738 (1984-07-01), Frentzel et al.
patent: 4528334 (1985-07-01), Knopf et al.
patent: 4590255 (1986-05-01), O'Connor
patent: 4607084 (1986-08-01), Morris
patent: 4762892 (1988-08-01), Koch et al.
patent: 4877711 (1989-10-01), Aoai et al.
patent: 4950582 (1990-08-01), Aoai et al.
patent: 5089376 (1992-02-01), Setthachayanon
patent: 5093386 (1992-03-01), Bishop et al.
R. C. Hire and S. C. Cohen, "Carboxyl Modified Polyols in Urethane Applications", Proceedings of the SPI-32nd Annual Conference, pp. 118-125, Oct. 1-8, 1989.
R. C. Hire, "Carboxyl Modified Polyols in Water-Borne Urethane Coatings" Symposium, pp. 357-358, Feb. 1-3, 1989 (New Orleans).
N. Barksby and R. M. Gerkin, "Acid Grafted Polyether: Reactive Intermediates for Use in Low VOC Coatings Application", 17th Annual Water-Borne and Higher-Solids Coatings Symposium, Feb. 21-23, 1990.
"Ucarmod", Technical Brochure, Union Carbide Corp. (1990).
Berman Susan
Looper Valerie E.
W. R. Grace & Co.,-Conn.
LandOfFree
Photocurable polyurethane-acrylate ionomer compositions for aque does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photocurable polyurethane-acrylate ionomer compositions for aque, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photocurable polyurethane-acrylate ionomer compositions for aque will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-576088