Radiation-polymerizable mixture, copolymer contained therein, an

Details Radiation-polymerizable mixture, copolymer contained therein, an Radiation-polymerizable mixture, copolymer contained therein, an

1985-07-11

1987-11-10

Keith, John E.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430910, 430281, 525242, 522121, 522 95, 526317, G03C 168, C08F 2006

Patent

active

047057408

ABSTRACT:
A layer comprised of a radiation-polymerizable mixture containing (a) a first compound capable of undergoing free radical polymerization, the first compound containing at least two terminal ethylenically unsaturated groups and having a boiling point above 100.degree. C. under atmospheric pressure, (b) a second compound capable of initiating the polymerization of the first compound when exposed to actinic radiation, and (c) a water-insoluble copolymer which is soluble in aqueous alkaline solutions and which comprises (c1) an .alpha..beta.-unsaturated aliphatic carboxylic acid and (c2) an alkyl methacrylate having at least 4 carbon atoms in the alkyl group, wherein the copolymer has a mean molecular weight in the range from about 50,000 to 200,000 possesses high flexiblity and resilience in both unexposed and exposed states. The mixture is particularly suitable for use as dry resist material for the tenting technique in printed circuit board production.

REFERENCES:
patent: 3554913 (1971-01-01), Gisser et al.
patent: 3833384 (1974-09-01), Noonan et al.
patent: 4296196 (1981-10-01), Faust
patent: 4361640 (1982-11-01), Pine
patent: 4427760 (1984-01-01), Nagazawa et al.
Robert W. Lenz, "Polymerization Mechanism and Processes", in Kirk-Othmer Encyclopedia of Chemical Technology, second edition, vol. 16, John Wiley and Sons, Inc., 1968, pp. 238-242.
European Search Report.
Polymer Handbook-J. Brandrup & E. H. Immergut, pp. 144-149.

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