Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2006-04-04
2006-04-04
Pezzuto, Helen L. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S832000, C524S836000
Reexamination Certificate
active
07022762
ABSTRACT:
A method has been disclosed of preparing ultrafine hydrophobic latex particles of polymers and copolymers by free radical emulsion polymerization in a water-based system, making use therefor, in order to polymerize or copolymerize monomers or monomer mixtures respectively, of at least one compound selected from the group consisting of dimers and cobalt complexes, acting as a chain transfer agent (CTA), wherein said latex particles have an average particle size of less than 100 nm, being more than 10% lower than if prepared in the absence of said CTA, characterized in that said polymerization is conducted in a water-based reaction in the presence of a chain transfer agent and of a surfactant, wherein said surfactant is present in a concentration versus said monomer or monomer mixture of from 5 up to 25% by weight for a non-ionic surfactant or from 0.05 up to 10% by weight for an ionic surfactant, more particularly a surfactant in a concentration below twice its critical micelle concentration.
REFERENCES:
patent: 5354800 (1994-10-01), Suzuki et al.
patent: 5444118 (1995-08-01), Tsuruoka et al.
patent: 5525670 (1996-06-01), Nishi et al.
patent: 5852124 (1998-12-01), Wang et al.
patent: 6048924 (2000-04-01), Obayashi et al.
patent: 6174953 (2001-01-01), Huybrechts
patent: 96 15158 (1996-05-01), None
patent: 98 50436 (1998-11-01), None
European Search Report, Application No. 00 00 0002, Mar. 1, 2001, Cauwenberg.
“Polymer Chemistry”, Raymond B. Seymour et al. 2-nd edition, Marcel Decker, Inc., pp. 337-339.
Aert Huub Van
Huybrechts Jos
Thillo Etienne Van
Vermeersch Joan
Agfa-Gevaert
Guy Joseph T.
Nexsen Pruet , LLC
Pezzuto Helen L.
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