COPOLYMER OF VINYLIDENE CHLORIDE WITH A CRYLONITRITE, IN THE FORM OF EXPANSIBLE BEADS OF A DIAMETER OF 4 MICROMETERS OR MORE BUT NOT MORE THAN 20 MICROMETERS
COPOLYMER OF VINYLIDENE CHLORIDE WITH A CRYLONITRITE, IN THE FORM OF EXPANSIBLE BEADS OF A DIAMETER OF 4 MICROMETERS OR MORE BUT NOT MORE THAN 20 MICROMETERS