Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-07-01
1997-12-02
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525293, 525298, 525301, 525302, 526 87, 526286, 526319, 5263297, C08F 830
Patent
active
056937172
ABSTRACT:
A method for producing branched polymerizates by radical polymerization of monomers in two stages comprising
in a first stage, adding 10 to 500 parts by weight of at least one monomer M.sub.1 and 0.1 to 20 parts by weight of a mercaptan with an olefinic, radically polymerizable double bond RM as a molecular weight regulator, and polymerizing said at least one monomer M.sub.1 mercaptan RM to form a copolymer MM.sub.1 in the presence of at least one polymerization initiator and 0 to 100 parts by weight of an inert, non-aqueous solvent, which completely dissolves the monomer M.sub.1, the mercaptan RM and the copolymer MM.sub.1, where the polymerizable double bonds of M.sub.1 and RM have a reactivity, expressed by a copolymerization parameter r, between 0.1 and 10, and
in a second stage, adding 10 to 2000 parts by weight of a monomer M.sub.2 and 0.01 to 10 parts by weight of a saturated molecular weight regulator, and optionally, an inert, non-aqueous solvent, to the reaction mixture formed in the first stage, and polymerizing in the presence of at least one polymerization initiator to form a branched polymerizate.
Branched polymerizates made by the method.
REFERENCES:
patent: 5194540 (1993-03-01), Yamamoto
patent: 5247040 (1993-09-01), Amick
patent: 5252678 (1993-10-01), Yamamoto
patent: 5314977 (1994-05-01), Amick
patent: 5385996 (1995-01-01), Rizzardo
Koralewski Klaus
Pfirmann Martina
Siol Werner
Wicker Michael
Roehm GmbH Chemische Fabrik
Zitomer Fred
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