POLYBUTYLENE TEREPHTHALATE
    15.
    发明专利

    公开(公告)号:CA1047199A

    公开(公告)日:1979-01-23

    申请号:CA252423

    申请日:1976-05-13

    Abstract: POLYBUTYLENE Terephthalate Reaction of terephthalic acid and butane diol using a tetravalent tin catalyst having one organo-to-tin linkage. This invention relates to the production of polybutylene terephthalate by reacting terephthalic acid and 1,4butylene glycol in the presence of tetravalent tin catalyst having one organo-to-tin linkage.

    2-HYDROCARBYLDITHIO-5-MERCAPTO-1,3,4-THIADIAZOLES AND THEIR PREPARATION

    公开(公告)号:CA966842A

    公开(公告)日:1975-04-29

    申请号:CA132241

    申请日:1972-01-12

    Inventor: BLAHA ELI W

    Abstract: 1377433 Thiadiazole derivatives STANDARD OIL CO 14 Feb 1972 6818/72 Heading C2C [Also in Divisions C3 and C5] Novel 2 - hydrocarbyldithio - 5 - mercaptothiadiazoles of formula where R 1 is C 1-280 hydrocarbyl are prepared by the oxidative coupling of R 1 SH and 2,5-dimercapto-1,3,4-thiadiazole or an alkali metal salt thereof, the mole ratio of mercaptan to thiadiazole being not greater than 1À1 : 1À0. Suitable oxidizing agents include H 2 O 2 , air and hypohalites. The products are used as sulphur scavengers in oils and fuels.

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