This process is a process for production of a vinyl chloride polymer by suspension polymerization or emulsion polymerization of vinyl chloride monomer or a mixture of vinyl chloride monomer with a vinyl monomer copolymerizable with said vinyl chloride monomer in an aqueous medium, characterized in that the polymerization is carried out in a polymerizer, the inner wall surface and portions of the auxiliary equipment thereof which may come into contact with the monomer during polymerization being previously coated with a scaling preventive comprising at least one selected from dyes, pigments and aromatic or heterocyclic compounds having at least 5 conjugated π bonds, while controlling the chloride ion concentration in the reaction mixture to not higher than 100 ppm. According to said process, scaling onto the inner wall surface of a polymerizer, etc. during polymerization can be prevented effectively and surely.
A polybutadiene composition comprising a polybutadiene type polymer and a compound represented by the following formula (I):
1
wherein Ar
1
and Ar
2
each independently represent an aromatic ring, X and Y each independently represent an alkylene group having one or two carbon atoms, an oxygen atom or a carbonyl group, is provided; and thermal degradation of the polybutadiene type polymer can be prevented even in an air-free environment.
一种聚丁二烯组合物,由聚丁二烯类聚合物和下式(I)所代表的化合物组成:
1
其中 Ar
1
和 Ar
2
分别独立地代表一个芳香环,X 和 Y 分别独立地代表一个或两个碳原子的亚烷基、一个氧原子或一个羰基;即使在无空气环境中,也能防止聚丁二烯型聚合物的热降解。
Seer, Monatshefte fur Chemie, 1912, vol. 33, p. 42
作者:Seer
DOI:——
日期:——
Faber; Nauta, Recueil des Travaux Chimiques des Pays-Bas, 1943, vol. 62, p. 469,482
作者:Faber、Nauta
DOI:——
日期:——
Friedel; Crafts, Annales de Chimie (Cachan, France), 1887, vol. <6> 11, p. 268