Abstract: Device for monitoring the quality of latex in a reactor during emulsion polymerization, including essentially a measuring probe placed in the reactor, an optical coupling of the said probe with a near-infrared spectrophotometer provided with means for emitting light and for capturing the scattered light which is reflected and a computer which has the correlation equations in its memory.

Abstract: Process for monitoring the quality of latices of halogen-containing vinyl polymers during polymerization in aqueous emulsion, in which a luminous radiation is emitted directly into the aqueous emulsion, the scattered light reflected by the polymer particles of the latex in the spectrum band situated between 1100 and 2500 nm is captured and transmitted to a near-infrared spectrophotometer and is measured at specific wavelengths related by correlation equations to specific properties of the latex which is monitored.Device for monitoring the quality of latices in a reactor during polymerization, including essentially a measuring probe placed in the reactor, an optical coupling of the said probe with a near-infrared spectrophotometer provided with means for emitting light and for capturing the scattered light which is reflected and a computer which has the correlation equations in its memory.