| 摘要 |
This improved thermoformable vinylidene chloride resin compsn. comprises (A) vinylidene chloride resin composed of 90 to 99 wt.% of vinylidene chloride and 1 to 10 wt.% of acrylic or methacrylic monomer, (B) a low-molecular or high -molecular plasticiser (0.5 to 5 wt.% of the resin) and (C) a condensed phosphate (0.2 to 5 wt.% of the resin). The condensed phosphate is an alkali metal salt having a structure in which phosphoric acid gps. are linked to each other linearly (1) or in a ring (2). The linear condensed phosphate (1) is represented by the general formula (I) where M is an alkali metal, esp. sodium or potassium, n is at least 2. The specific linear condensed phosphate can be pyrophosphate, tripolyphosphate, tetrapolyphosphate, etc. The ring condensed phosphate (2) is represented by the general formula (MPO3)m where M is an alkali metal esp. sodium or potassium; m is at least 3. Specifically, the ring condensed phosphates can be trimetaphosphate, tetrametaphosphate or hexametaphosphate. The condensed phosphates are fine powders in which the mean particle size lies between 5 and 80 microns. The resin laminate comprises layers of the vinylidene chloride resin compsn. (described above) and layers of thermoplastic resin having a thermoforming temp. higher than that of the vinylidene chloride resin. |
