Polymerization process using diperoxy ketals as finishing cataly

Details Polymerization process using diperoxy ketals as finishing cataly Polymerization process using diperoxy ketals as finishing cataly

1977-01-06

1978-12-19

Lilling, Herbert J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526216, 526228, 5262323, 526346, C08F 200, C08F 438, C08F 1202, C08F11202

Patent

active

041307003

ABSTRACT:
A process for the free-radical polymerization of vinyl monomers, including vinyl aromatic monomers, at at least two distinct progressively higher polymerization temperatures, each between the temperatures of about 70.degree. C to about 150.degree. C in the presence of at least two free-radical initiators, one of which initiators, used in relatively minor proportions, has the formula ##STR1## wherein x is a numeral from 1 to 5 inclusive, B is ##STR2## A is hydrocarbyl, A, is tertiary hydrocarbyl and R is A, a hydrocarbyloxy or alkylperoxy and the other initiator, used in relatively major proportions, has a 10 hour half-life temperature below about 100.degree. C. The distinct temperatures for polymerization may occur as separate parts of a polymerization in which the temperature of the system continually increases.

REFERENCES:
patent: 3433825 (1969-03-01), Maltha et al.
patent: 3681305 (1972-08-01), Tirpak
patent: 3726846 (1973-04-01), Squire et al.
patent: 3743630 (1973-07-01), Wood
patent: 3808185 (1974-04-01), Jaspers
patent: 3832336 (1974-08-01), Groepper et al.
Swern, "Organic Peroxides", pp. 81-87, vol. 1, Wiley Inters., 1970.
Brandrup et al., "Polymer Handbook", II-1-55, Intersciences, 1966.

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