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    • 4. 发明授权
    • Method for controlling the functionality distribution of liquid
copolymers
    • 控制液体共聚物官能度分布的方法
    • US4358566A
    • 1982-11-09
    • US941154
    • 1978-09-11
    • Gary Ver Strate
    • Gary Ver Strate
    • C08F8/04C08C19/02
    • C08F8/04
    • Macromolecules with a distribution of molecular weights and functionality which can be rendered useful by heterogeneous catalytic modification are selectively modified on the basis of molecular dimensions and diffusion rates, using catalysts with specific pore size and particle size distribution. For example, liquid polymers are produced having both hydroxyl and carbonyl functionality with the carbonyl/hydroxyl ratio increasing with molecular weight. More specifically, a high molecular weight polymer is cleaved by ozonation with subsequent reduction with a heterogeneous catalyst having some pores smaller than the radii of gyration of the largest fractions but larger than the radii of gyration of other fractions of the molecular weight distribution of the polymer. The reduction may be performed in an intraparticle mass transfer controlling regime which further influences reduction efficiency as a function of molecular weight. This selectivity is used to narrow or otherwise modify the functionality distribution and make the product generally more useful.
    • 通过使用具有特定孔径和粒度分布的催化剂,可以基于分子尺寸和扩散速率,选择性地修饰具有分子量和功能性分布的可通过非均相催化改性有用的大分子。 例如,产生具有羟基和羰基官能团的液体聚合物,羰基/羟基比率随分子量的增加而增加。 更具体地说,高分子量聚合物被臭氧化裂解,随后用非均相催化剂还原,所述非均相催化剂的一些孔小于最大馏分的回转半径,但大于聚合物的分子量分布的其它馏分的回转半径 。 还原可以在颗粒内传质控制方式中进行,这进一步影响作为分子量的函数的还原效率。 该选择性用于缩小或以其他方式修改功能分布,并使产品通常更有用。