Polymerization of monomers with differing reactivities

Details Polymerization of monomers with differing reactivities Polymerization of monomers with differing reactivities

2008-07-15

2008-07-15

Pezzuto, Helen L. (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S079000, C526S084000, C526S085000, C526S307300, C526S310000, C526S317100

Reexamination Certificate

active

07399810

ABSTRACT:
There is provided a process for producing a polymer comprising the steps of(a) adding at least one low-reactivity monomer to a reaction vessel with a decreasing rate of addition,(b) adding at least one high-reactivity monomer to said reaction vessel,(i) wherein less than 1% of all of said high-reactivity monomers, by weight of high reactivity monomers, based on the weight of all said high-reactivity monomers, is added to said reaction vessel before the beginning of said step (a), and(ii) wherein at least half of all of said high-reactivity-monomers, by weight of high reactivity monomers, based on the weight of all of said high-reactivity monomers, is added to said reaction vessel before the completion of said step (a), and(c) adding at least one chain regulator to said reaction vessel prior to the completion of said step (a),wherein said steps (a), (b), and (c) are performed while conditions in said reaction vessel will cause polymerization of said low-reactivity monomer and said high-reactivity monomer.

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H.A.S. Schoonbrood, et al. “Emulsion Co- and Terpolymerization of Styrene, . . . ” Journal of Polymer Science: Pt. A: Polymer Chemistry, vol. 34. pp. 949-955, 1996.
F. Brand, et al., “Polymelectrolytes with Various Charge Densities: Synthesis and Charterization . . . ,” Die Angewandte Makromolekulare Chmie vol. 248, No. 4286, pp. 41-71, 1997.

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