Polystyrene with distinct moieties of molecular weight distribut

Details Polystyrene with distinct moieties of molecular weight distribut Polystyrene with distinct moieties of molecular weight distribut

1978-01-06

1979-01-30

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 78, 526 87, 526228, 526346, 526909, 526910, 260886, C08F 218, C08F 438, C08F11208

Patent

active

041373880

ABSTRACT:
Crystal polystyrene with improved flow properties useful in injection molding is prepared in a two-stage process in which a first portion of monomer is polymerized in the presence of about 0.3 to about 2.0% peroxide initiator to convert about 70 to 95% of the monomer present to polymer having a number average molecular weight of 20,000 to 50,000 and a weight average of 50,000 to 100,000; then adding the rest of the monomer thereby reducing the catalyst concentration to generate a second moiety of polymer so that the final product has a weight average molecular weight of 150,000-300,000, and a number average of 50,000-70,000.

REFERENCES:
patent: 2545702 (1951-03-01), Norris
patent: 2656334 (1953-10-01), Alelio
patent: 2907756 (1959-10-01), Doak
patent: 3052664 (1962-09-01), Cleland et al.
patent: 3252950 (1966-05-01), Terenzi et al.
patent: 3293233 (1966-12-01), Erchak et al.
patent: 3681305 (1972-08-01), Tirpak et al.
patent: 3726846 (1973-04-01), Squire et al.
patent: 3726848 (1973-04-01), Squire et al.
patent: 3817965 (1974-06-01), Mace et al.
Polymer Science, USSR, vol. 14, #5, 1972, pp. 1143-1153.

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