摘要:
Quaternary sulfoalkyl or sulfoalkenyl salts of tertiary amine bases are prepared by reacting the tertiary amine bases at elevated temperatures with a hydroxy alkane sulfonic acid or a hydroxyalkene sulphonic acid.
摘要:
Tertiary amines may be quaternized by heating them with a sulfoalkylating agent of this invention to a temperature of from 100.degree. to 250.degree. C. The sulfoalkylating agents which are believed to be hydroxy alkane sulfonic acid sulfoalkyl esters are free from sultone and are prepared by heating a hydroxy alkane sulfonic acid of propane or butane or the corresponding sultone to a temperature in the region of from 80.degree. to 180.degree. C. in the presence of water in an amount of 1 to 4 moles per mole of hydroxy alkane sulfonic acid or alkane sultone.
摘要:
Sulfoalkylating agents free from sultones may be obtained by heating hydroxy alkane sulfonic acids of propane or butane or the corresponding sultones having 5 or 6 ring members with up to four times the molar quantity of water to a temperature in the region of from 80.degree. to 180.degree. C. The sulfoalkylating agents are believed to be the "dimeric esters" of the hydroxy alkane sulfonic acids.
摘要:
Photographic panchromatic black-and-white silver halide recording material having two silver halide emulsion layers wherein a layer, called hereinafter first layer, has a panchromatic sensitivity and another layer, called hereinafter second layer, has a blue sensitivity, which is, when determined on comparable wedge images, at density 0.3 at least 0.6 log I.t units higher than its separately considered green and red sensitivity, wherein for the determination of the sensitivities a blue filter, a green filter, and a red filter as characterized in FIG. 1 are used, both said layers having a substantially identical threshold sensitivity to blue light and the spectral sensitivity of this material at 650 nm being at least 0.8 powers of ten lower than at 620 nm, the sensitivity beyond 650 nm diminishing even further.