Phenol-Formaldehyde Novolac Resin Having Low Concentration of Free Phenol
    3.
    发明申请
    Phenol-Formaldehyde Novolac Resin Having Low Concentration of Free Phenol 有权
    苯酚甲醛酚醛清漆树脂低浓度游离苯酚

    公开(公告)号:US20120295114A1

    公开(公告)日:2012-11-22

    申请号:US13563879

    申请日:2012-08-01

    摘要: A phenol-formaldehyde novolac resin having a low concentration of free phenol prepared by distilling residual phenol from a molten novolac resin and replacing at least a portion of the phenol with a solvent having a volatility equal to or less than phenol. Such modified novolac resins are suitable for the production of resin coated molding sands for shell molding and sand cores, as well as for the production of resin coated proppants for use in oil and gas recovery operations.

    摘要翻译: 一种苯酚 - 甲醛酚醛清漆树脂,其具有低浓度的游离酚,其通过从熔融酚醛清漆树脂中蒸馏残留的苯酚,并用挥发度等于或小于苯酚的溶剂代替至少一部分苯酚。 这种改性酚醛清漆树脂适用于生产用于壳模和树脂的树脂涂层型砂,以及用于生产用于油气回收操作的树脂涂覆的支撑剂。

    PHENOL-FORMALDEHYDE NOVOLAC RESIN HAVING LOW CONCENTRATION OF FREE PHENOL
    7.
    发明申请
    PHENOL-FORMALDEHYDE NOVOLAC RESIN HAVING LOW CONCENTRATION OF FREE PHENOL 有权
    具有低浓度自由基酚的酚醛甲醛NOVOLAC树脂

    公开(公告)号:US20080280787A1

    公开(公告)日:2008-11-13

    申请号:US11747343

    申请日:2007-05-11

    摘要: A phenol-formaldehyde novolac resin having a low concentration of free phenol prepared by distilling residual phenol from a molten novolac resin and replacing at least a portion of the phenol with a solvent having a volatility equal to or less than phenol. Such modified novolac resins are suitable for the production of resin coated molding sands for shell molding and sand cores, as well as for the production of resin coated proppants for use in oil and gas recovery operations.

    摘要翻译: 一种苯酚 - 甲醛酚醛清漆树脂,其具有低浓度的游离酚,其通过从熔融酚醛清漆树脂中蒸馏残留的苯酚,并用挥发度等于或小于苯酚的溶剂代替至少一部分苯酚。 这种改性酚醛清漆树脂适用于生产用于壳模和树脂的树脂涂层型砂,以及用于生产用于油气回收操作的树脂涂覆的支撑剂。