Process for the preparation of partially etherified methylolmelamines
    2.
    发明授权
    Process for the preparation of partially etherified methylolmelamines 失效
    制备部分醚化羟甲基三聚氰胺的方法

    公开(公告)号:US4408045A

    公开(公告)日:1983-10-04

    申请号:US361308

    申请日:1982-03-23

    IPC分类号: C07D251/64 C07D251/70

    CPC分类号: C07D251/64

    摘要: Process for the preparation of monomeric methylolmelamine which is partially etherified with methanol or ethanol and which contains at least 4 moles of formaldehyde per mole of melamine, by reacting melamine, paraformaldehyde and methanol or ethanol in a single stage reaction, the molar ratio of melamine to formaldehyde to alcohol being 1:5 to 10:6 to 20, in a virtually anhydrous medium, under a nitrogen atmosphere, at a pH of 7 to 8 and a temperature from 50.degree. to 90.degree. C. and with a reaction time of from 3 to 30 hours.

    摘要翻译: 制备单体羟甲基三聚氰胺的方法,该单体羟甲基三聚氰胺与甲醇或乙醇部分醚化,每摩尔三聚氰胺含有至少4摩尔甲醛,通过在单阶段反应中使三聚氰胺,多聚甲醛和甲醇或乙醇反应,三聚氰胺与 甲醛至醇的比例为1:5至10:6至20,在几乎无水的介质中,在氮气氛下,pH为7至8,温度为50至90℃,反应时间为 3至30小时。

    Process for the preparation of pure
1-phenyl-3-carbalkoxy-5-hydroxypyrazoles
    3.
    发明授权
    Process for the preparation of pure 1-phenyl-3-carbalkoxy-5-hydroxypyrazoles 失效
    纯1-苯基-3-烷氧基-5-羟基吡唑的制备方法

    公开(公告)号:US4837335A

    公开(公告)日:1989-06-06

    申请号:US177345

    申请日:1988-04-04

    IPC分类号: C07D231/22

    CPC分类号: C07D231/22

    摘要: Process for the preparation of pure 1-phenyl-3-carbalkoxy-5-hydroxypyrazoles of the general formula ##STR1## in which R denotes methyl or ethyl, by reaction of acetylsuccinic esters with phenyldiazonium chloride and a base with pK.sub.B value of 3.6 to -1.5 at a pH of 4 to 9 in an aqueous medium to give the corresponding phenylhydrazone, which is cyclized at a pH of 7 to 9.5, with warming and with the addition of ammonia, to give the ammonium salt of the hydroxypyrazole. Compound I is formed by acidification.

    摘要翻译: 制备通式(Ⅰ)的纯1-苯基-3-烷氧基-5-羟基吡唑的方法,其中R表示甲基或乙基,通过乙酰基琥珀酸酯与苯基氯化钠的反应和pKB值为 3.6至-1.5,在水性介质中的pH为4至9,得到相应的苯腙,其在pH为7至9.5的条件下加温并加入氨,得到羟基吡唑的铵盐。 化合物I通过酸化形成。

    Storage-stable lacquer resins
    4.
    发明授权
    Storage-stable lacquer resins 失效
    储存稳定的漆树脂

    公开(公告)号:US4180488A

    公开(公告)日:1979-12-25

    申请号:US933926

    申请日:1978-08-15

    CPC分类号: C09D7/1241 C08K5/3492

    摘要: A storage-stable lacquer resin which can be baked without yellowing at a low baking temperature, and is based on an alkyd resin, acrylic resin or epoxy resin, is obtained by reacting the resin with a bis- or tris-alkoxyalkylamino-s-triazine which has been obtained by heating a triazine derivative of the general formula: ##STR1## wherein X is an alkyl group having 1 to 4 carbon atoms, a phenyl group or the group ##STR2## and each of R and R' is an alkyl group radical having up to six carbon atoms, at 100.degree. to 200.degree. C. up to a weight loss of 3 to 25%, preferably 5 to 15%.

    摘要翻译: 通过使树脂与双 - 或三 - 烷氧基烷基氨基-s-三嗪反应,得到可在低烘焙温度下烘烤而不变黄并且基于醇酸树脂,丙烯酸树脂或环氧树脂的储存稳定的漆树脂 其通过加热下列通式的三嗪衍生物获得:其中X是具有1至4个碳原子的烷基,苯基或基团,R和R'各自为烷基 具有至多6个碳原子的基团,在100至200℃下,至3至25%,优选5至15%的重量损失。