TITLE: Rubber modified methyl methacrylate syrups, production and use in
producing cast sheets and moulding materials.
European Patent Application EP0019372 A2

ABSTRACT:
Abstract not available for EP0019372
Abstract of corresponding document: US4287317
A continuous process for producing rubber-modified methyl methacrylate
syrups which comprises continuously supplying a material liquor
comprising 1 to 20 parts by weight of a rubbery polymer dissolved in
100 parts by weight of a monomer comprising 60 to 100% by weight of
methyl methacrylate, and a radical-polymerization initiator to the
first reaction zone, continuously polymerizing at such a stationary
conversion that the rubber polymer is dispersed in the form of
particles form while maintaining the temperature and residence time in
the zone so that a steady state is achieved in the zone and the
steady-state concentration of the initiator in the zone is 1/2 to
1/1,000 time as much as the concentration of initiator supplied,
continuously taking out the resulting reaction mixture from the zone,
and passing it through the second reaction zone having a volume of 0 to
5 times as much as that of the first reaction zone, to obtain a stable
syrup comprising a disperse phase and a continuous phase, the former
phase being substantially a solution of the rubbery polymer in the
monomer and the latter one being substantially a solution of the
resinous polymer in the monomer, and a process for the production of
methyl methacrylate cast sheets and molding materials having an
excellent impact resistance from the syrups.

INVENTORS:
Kitagawa, Yoshihiko
Hanamura, Yoshimi
Yuyama, Masahiro
Moritani, Masahiko
Sakuramoto, Akira
Suzuki, Mikio

APPLICATION NUMBER: EP19800301309
PUBLICATION DATE: 11/26/1980
FILING DATE: 04/23/1980

ASSIGNEE: SUMITOMO CHEMICAL CO (JP)
INTERNATIONAL CLASSES: C08F291/00; C08F2/00; C08F2/02; C08F291/02; (IPC1-7): C08F291/02;
C08F2/02
EUROPEAN CLASSES: C08F291/02+220/14

DOMESTIC PATENT REFERENCES:
EP0014574 Process for the production of graft polymer, the polymer so
 produced and polystyrene compositions containing it as an impact
 modifier.

FOREIGN REFERENCES:
3900453Process for the production of methacrylate polymer molding
 materials
3981944Method for producing impact resistant thermoplastic resin by
 continuous bulk polymerization
3178489Multi-stage polymerization process for preparing transparent
 compositions
3876727Plastic composition and method of preparing same
3474081METHYL METHACRYLATE POLYMER AND PROCESS FOR MAKING SAME
GB937215A

OTHER REFERENCES:
JOURNAL OF POLYMER SCIENCE: POLYMER CHEMISTRY EDITION, vol. 16, 1978,
pages 337-342, S.S. KARAENEV et al.: "Phase Formation and Phase
Inversion during the Bulk Precopolymerization of Solutions of Rubber in
Styrene Methyl Methacrylate".