EP 0927197 A1 19990707 - METHOD FOR PRODUCING METHYL-METHACRYLATE POLYMERS IN A RECYCLE REACTOR
Title (en)
METHOD FOR PRODUCING METHYL-METHACRYLATE POLYMERS IN A RECYCLE REACTOR
Title (de)
VERFAHREN ZUR HERSTELLUNG VON METHYLMETHACRYLAT-POLYMEREN IN EINEM KREISLAUFREAKTOR
Title (fr)
PROCEDE DE PREPARATION DE POLYMERES DE METHYLMETHACRYLATE DANS UN REACTEUR A RECIRCULATION
Publication
Application
Priority
- DE 19638094 A 19960918
- EP 9705125 W 19970918
Abstract (en)
[origin: DE19638094A1] The invention concerns methyl-methacrylate polymers with an heterogeneity of 1.0 to 1.2. Said polymers are obtained continuously by polymerization of monomers consisting of no less than 90 % by weight methyl-methacrylate in a recycle reactor, which has preferably at least a tubular reactor or a multitube-flow reactor, avoiding unwarranted wall deposits. Said polymers are produced in such a way that temperature during polymerization stands at 135-150 DEG C, the recycle relation is bigger than 20 when divided by the number of chargings per circulation loop, the mean effective axial circulation is faster than 5 cm/s, a polymerization initiator having a batch half change value of 3 to 10 min. is used, and the inflow concentration of the initiator is set in such a way that by a mean residence time of 1.3 to 2.5 hours a polymer rupture of 0.50 to 0.70 at the output of the reactor is achieved. Preforms having very good optical properties can be produced with the homogeneous polymers.
IPC 1-7
IPC 8 full level
B01J 19/24 (2006.01); C08F 2/02 (2006.01); C08F 20/14 (2006.01)
CPC (source: EP)
B01J 19/2435 (2013.01); B01J 19/245 (2013.01); C08F 2/02 (2013.01); C08F 20/14 (2013.01); B01J 2219/00094 (2013.01); B01J 2219/00164 (2013.01)
Citation (search report)
See references of WO 9812229A1
Designated contracting state (EPC)
BE DE ES FR GB IT NL
DOCDB simple family (publication)
DE 19638094 A1 19980319; EP 0927197 A1 19990707; WO 9812229 A1 19980326
DOCDB simple family (application)
DE 19638094 A 19960918; EP 9705125 W 19970918; EP 97943868 A 19970918