Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1978-09-11
1982-11-09
Hamrock, William F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525338, 525370, 525371, C08C 1902, C08F 804
Patent
active
043585663
ABSTRACT:
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.
REFERENCES:
patent: 3392154 (1968-07-01), Baldwin
patent: 3459814 (1969-08-01), Kovach et al.
Cohen H. L.
Exxon Research & Engineering Co.
Hamrock William F.
Naylor H. E.
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