Two-step copolymerization process by controlling the temperature

Details Two-step copolymerization process by controlling the temperature Two-step copolymerization process by controlling the temperature

1979-10-23

1981-12-15

Lilling, Herbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 294UA, 260 296R, 260 296T, 260 296Z, 260 296H, 260 296HN, 260 297H, 260 297T, 260 297SQ, 260 297NQ, C08L 904, C08L 1902, C08L 3306, C08F22018

Patent

active

043058590

ABSTRACT:
Improved process for the preparation of aqueous emulsions of addition copolymers having functional groups to provide thermosetting capability via condensation. The process improvement resides in reducing the amount of unwanted premature condensation of the functional group. The process has two steps, one consisting of polymerizing a portion of the monomer reactants at a temperature not above 60.degree. C. if the functional group is present and the other of continuing the polymerization with the addition of the remaining monomer reactants at a temperature not above 60.degree. C. and at a pH in the range of from 1 to 7. The process is of use in producing improved thermosetting enamels.

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patent: 4125696 (1978-11-01), Kamath

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