| 摘要 |
Aqueous polymer dispersions based on acrylic polymers in which the diameter of the individual particles is between 50 nm and 1 000 nm, and the particle distribution by weight relative to the total dry weight is as follows: a) from 50 nm to 180 nm: from 10% to 70%, preferably from 20% to 60%; b) from >180 nm to 1 000 nm: from 30% to 90%, preferably from 40% to 80%; the said dispersions having a minimum film-forming temperature of between about 1° C. and 80° C., which, after drying, produce films which, when subjected to heating under a nitrogen atmosphere, show a weight loss, for films about 1 mm in thickness, and for the following heating cycle, which simulates the process for preparing CRTs, from 25° C. to 375° C. from 40% to 70% by weight, from 375° C. to 440° C. for greater than 99% by weight, after the isothermal stage at 440° C., the remaining residual ash being less than about 0.1% by weight.
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