Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-02-16
2008-05-06
Gulakowski, Randy (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S071000, C525S086000, C525S089000, C525S316000, C526S124200
Reexamination Certificate
active
07368504
ABSTRACT:
Process for preparation of impact-resistant polystyrene from diene monomers and from styrene monomers via anionic polymerization, where1) in a stage 1) a rubber solution is prepared from the diene monomers, or from the diene monomers and from the styrene monomers, using an alkali metal organyl compound as initiator and with concomitant use of a solvent, and then2) in a stage 2), styrene monomer is added to the rubber solution, and the resultant mixture is polymerized anionically to give the impact-resistant polystyrene, and where, after stage 1) and prior to stage 2), an organylaluminum compound and an alkali metal hydride are added to the rubber solution.
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Asinovsky Olga
BASF - Aktiengesellschaft
Connolly Bove Lodge and Hutz
Gulakowski Randy
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