Controlled polymerization

Details Controlled polymerization Controlled polymerization

2006-01-31

2006-01-31

Egwim, Kelechi C. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S217000, C526S218100, C526S219200, C526S219500, C526S219600, C526S227000

Reexamination Certificate

active

06992156

ABSTRACT:
The present invention discloses an emulsion polymerization process that comprises: (1) preparing an aqueous polymerization medium which is comprised of (a) at least one monomer, (b) a polymerization control agent, and an emulsifier, wherein the emulsifier is prepared in-situ within the aqueous polymerization medium; and (2) initiating polymerization of said monomer within the aqueous polymerization medium. The subject invention more specifically reveals an emulsion polymerization process that comprises: (1) preparing a monomer solution which is comprised of (a) at least one monomer, (b) a conjugate acid of a surfactant with a pKaof less than 14, and (c) a controlled free radical polymerization agent; (2) preparing an aqueous medium which is comprised of (a) water, and (b) a conjugate base of a weak acid wherein the pKbof the base is less than 14; and (3) mixing the monomer solution with the aqueous medium under conditions that result in the in-situ formation of an emulsifier, and (4) initiating free radical polymerization.

REFERENCES:
patent: 4581429 (1986-04-01), Solomon et al.
patent: 5401804 (1995-03-01), Georges et al.
patent: 5990224 (1999-11-01), Raynolds et al.
patent: 6262169 (2001-07-01), Helmer et al.
patent: 6262206 (2001-07-01), Nesvadba et al.
patent: 6353065 (2002-03-01), Charleux et al.
patent: 2002/0019505 (2002-02-01), Macleod et al.
patent: 2002/0065380 (2002-05-01), Charmot et al.
patent: 2002/0165331 (2002-11-01), Vanhoorne et al.
patent: 970973 (2000-01-01), None
patent: WO 98/32726 (1998-07-01), None
Database Zcaplus “Online Chemical Abstracts” Prokopov N.I., Gritskova I.A. “Characterstic features of heterophase polymerisation of styrene with simultaneous formation of surfactants at the interface” retrieved from STN, accession no. 2002:150470 Database accession no. 136:325847 XP002276879, (Feb. 2002).
Prokopov N.I., Gritskova I.A. “Characterstic features of heterophase polymerisation of styrene with simultaneous formation of surfactants at the interface”(Russ. Chem. Rev.vol. 70 No. 9, 2001, pp. 791-800).
Cunningham, Michael F. “Living/controlled radical polymerizations in dispersed phase systems” (Prog. Polym. Sci.27 (2002) 1039-1067).
Butté, Alessandro, et al “Miniemulsion Living Free Radical Polymerization of Styrene” (Macromolecules2000, 33, 3485-3487).
Gilbert, Robert G., et al “RAFT in Emulsion Polymerization: What Makes it Different” (Polymer Preprints2002, 43(2), 130).
Bon, Stefan A.F. et al, “Controlled Radical Polymerization in Emulsion” (Macromolecules1997, 30, 324-326).
Moad, Graerne, et al, “Living freed radical polymerization with reversible addition—fragmentation chain transfer (the life of RAFT)” (Polym Int49:993-1001 (2000)).

Affiliated with

Also associated with

Rating

Controlled polymerization does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Controlled polymerization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controlled polymerization will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3583650