| abstract |
NEW MATERIAL:The compound of formula (A is O or S; R is H or methyl; m is 1 or 2; n is 0 or 1). n EXAMPLE: 2,2'-Oxydiethanethiol diacrylate. n USE: Raw material for acrylic resin or methacrylic resin useful as an optical part such as lens. n PREPARATION: The objective compound of formula can be produced e.g. by adding 2W2.5mol of acryloyl chloride or methacryloyl chloride to 1mol of ethanedithiol 2,2'-oxydiethanethiol or 1,4-butanedithiol, etc., in a solvent (e.g. hexane, benzene, etc.), keeping the mixture at -10W+30°C, preferably -10W+10°C and reacting the components in the presence of a hydrochloric acid scavenger such as triethylamine. A resin having high refractive index and keeping high Abbe number can be produced by thermally polymerizing the compound of formula with an unsaturated carboxylic acid ester. n COPYRIGHT: (C)1988,JPO&Japio |