abstract |
A FILM ASSEMBLY SUITABLE FOR USE AS A BASE FOR PHOTOGRAPHIC FILM COMPRISES SYNTHETIC LINEAR POLYESTER FILM BASE CARRYING A LAYER OF A COPOLYMER OF A VINYL HALOGENO ESTER SUCH AS VINYL CHLOROACETATE WITH AT LEAST ONE OTHER MONOMER COPOLYMERISABLE THEREWITH, THE SAID MONOMER AND AT LEAST ONE OF SAID MONOMERS BEING SELECTED SO THAT THE FINAL COPOLYMER HAS A SOFTENING POINT LOWER THAN THAT OF THE PRODUCT OBTAINED BY POLYMERISATION IN THE ABSENCE OF THE SAID SELECTED MONOMER OR MONOMERS. |