会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 4. 发明授权
    • Continuous production of reduced gel content hydroxylated addition
polymers
    • 连续生产降低凝胶含量的羟基化加成聚合物
    • US5508366A
    • 1996-04-16
    • US325001
    • 1994-10-18
    • Kevin M. AndristJ. David CampbellRichard W. ChyllaRakesh K. Popli
    • Kevin M. AndristJ. David CampbellRichard W. ChyllaRakesh K. Popli
    • C08F2/06C08F220/18C08F220/28C08F220/30C08F20/26
    • C08F220/28
    • A process is disclosed for the continuous production, with reduced gel formation, of free radical addition polymers from ethylenically unsaturated monomers containing at least one free hydroxyl group such as 2-hydroxyethyl methacrylate, from about 0 to about 5% by weight of an alpha-beta unsaturated carboxylic acid such as acrylic acid or methacrylic acid, and the remainder of the monomers used are free radical addition copolymerizable compounds such as styrene, methyl methacrylate and butyl acrylate. The free radical addition polymerization is conducted at from about 150.degree. C. to about 310.degree. C. under superatmospheric pressure in the presence of one or more solvents. The solvent or the volume average of the solvent mixture has an overall calculated root mean square value of the hydrogen bonding and polar contributions of each solvent's solubility parameters in the range of from about 6 to about 15. The solvent or solvents in total have sufficient volatility under the conditions being used to conduct the polymerization such that any liquid condensate of vapor mixture forming on interior surfaces of the reactor equipment located above the surface of the monomer reactants contains at least 50 mole percent of the solvent to reduce gel formation on such interior surfaces. The process permits the continuous polymerization of the polymers over extended periods of time with reduced formation of gel particles and gel deposits.
    • 公开了一种用于连续生产的方法,其具有减少的凝胶形成,从含有至少一个游离羟基的烯键式不饱和单体(例如甲基丙烯酸2-羟乙酯),约0至约5重量%的α-烯属不饱和单体, β不饱和羧酸如丙烯酸或甲基丙烯酸,其余所用的单体是自由基加成可共聚合的化合物,如苯乙烯,甲基丙烯酸甲酯和丙烯酸丁酯。 在大气压下,在一种或多种溶剂的存在下,自由基加成聚合在约150℃至约310℃下进行。 溶剂混合物的溶剂或体积平均值具有氢键的总计算的均方根值和每种溶剂的溶解度参数的极性贡献在约6至约15的范围内。溶剂或溶剂总共具有足够的挥发性 在用于进行聚合的条件下,使得形成在位于单体反应物表面之上的反应器设备的内表面上的蒸气混合物的任何液体冷凝物含有至少50摩尔%的溶剂以减少在这些内表面上的凝胶形成 。 该方法允许聚合物在延长的时间段内连续聚合,减少了凝胶颗粒和凝胶沉积物的形成。