| 摘要 |
The invention comprises esters of formula <FORM:0833867/IV (b)/1> wherein R is an alkyl residue of a monohydric aliphatic alcohol which contains at least 6 carbon atoms and is such that the ester is liquid at room temperatures and n is 0 or 1. They are used as plasticizers in polyvinyl chloride resins (see Group IV(a)). They are prepared by mixing appropriate amounts of a phthalic acid, an alkanol preferably having 6-10 carbon atoms and neopentyl glycol with an esterification catalyst such as sulphuric, phosphoric or p-toluenesulphonic acid and refluxing in the presence of a water-entraining solvent such as hexane, toluene or xylene. In examples, the esters wherein R is iso-octyl and n is O and R is decyl and n=1, the -C6H4- residue being derived from o-phthalic acid, are prepared.ALSO:Polyvinyl chloride resins are plasticized by the addition of esters of formula <FORM:0833867/IV (a)/1> wherein R is an alkyl residue of a monohydric aliphatic alcohol which contains at least 6 carbon atoms and is such that the ester is liquid at room temperatures and n is 0 or 1 (see Group IV (b)). Homopolymers of vinyl chloride or its copolymers with, for example, vinyl acetate or the alkyl esters of maleic or fumaric acids, may be used. In examples compositions of polyvinyl chloride and barium cadmium laurate, or of a copolymer of vinyl chloride and vinyl acetate with barium cadmium laurate and titanium dioxide are plasticized with esters of the above formula and the properties of the plasticized resin compared with similar compositions using other plasticizing esters. |
