1. A PHOTOPOLYMERIZABLE FILM-FORMING CROSSLINKING COPOLYMER THAT CONSISTS ESSENTIALLY OF (A) ABOUT 1-99 PERCENT BY WEIGHT OF UNITS DERIVED FROM AN ETHYLENICALLY UNSATURATED MONOMER AND (B) ABOUT 1-99 PERCENT BY WEIGHT OF UNITS DERIVED FROM A COMPOUND HAVING THE STRUCTURE

3-R1,5-R2,7A-(R-O-(C(-R3)(-R4))N-)-TETRAHYDRO-1H,3H,5H-

OXAZOLO(3,4-C)OXAZOLE XY

WHEREIN R IS

-CO-CH=CH2, -CO-(CH3)2, -CO-C(-COOH)=CH2, -CO-CH=CH-COOH,

-CO-(1,2-PHENYLENE)-COOH OR 3-R1,5-R2-TETRAHYDRO-1H,3H,

5H-OXAZOLO(3,4-C)OXAZOL-7A-YL-(C(-R3)(-R4))N-OOC-CH=CH-

CO- XY

R1, R2, R3, RR4 IS EACH -H, C6H5, AN ALKYL GROUP OF 1 TO 20 CARBON ATOMS, AN ARYL OR AN ALKYL GROUP HAVING HALOGEN, MRCAPTAN, DISULFIDE, ALKENE, PEROXY, CARBONYL, AMIDE, AMINE, CARBOXYL, OR HYDROXYL SUBSTITUTION AND AY BE THE SAME OR DIFFERENT, N IS AN INTEGER OF 0 TO 20; XY MAY BE ABSENT, OR X MAY BE-H, AN ALKYL GROUP OF 1 TO 20 CARBON ATOMS, PHENYL, BENZYL, SUBSTITUTED PHENYL, OR SUBSTITUTED BENXYL AND Y MAY BE -CI, BR, -I, -SO3C6CH3, -OC6H2(NO2)3, -HSO4, -H2PO4, OR -NO3, OR Y MAY BE ABSENT AND X MAY BE BF3, FECI3, OR AICI3.