Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP7255078Aexternal-prioritypatent/JP2958260B2/en
Application filed by Polyplastics CofiledCriticalPolyplastics Co
Publication of MXPA96004545ApublicationCriticalpatent/MXPA96004545A/en
Publication of MX9604545ApublicationCriticalpatent/MX9604545A/en
Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds
(AREA)
Abstract
The present invention provides a process for the preparation of a thermally very stable polyacetal copolymer, which comprises very small unstable terminals with a high polymerization yield, with trioxane copolymerization as the main monomer, with a comonomer copolymerizable therewith, wherein an isopolyacid or an acid salt thereof is used as a polymerization catalyst; the catalyst can be simply deactivated in a small amount of deactivating solution after polymerization is completed; a rinsing step is not required; copolymerization is performed with an isopolyacid or an acid salt thereof used as a polymerization catalyst until residual monomers reach a value of 10 percent by weight maximum of all the monomers fed, and a solution containing a deactivator for the aforementioned catalyst is added in an amount of 0.01 to 10 percent by weight, based on the resulting raw polymer, to deactivate the catalyst, followed by subjecting the intact raw polymer to a heat-melting treatment without rinsing it.
MX9604545A1995-10-021996-10-02Process for the preparation of a polyacetal copolymer.
MX9604545A
(en)
Method of preparing an aqueous solution comprising vinylpyrrolidone/vinyl acetate copolymers of various molecular weights using a single initiator system consisting essentially of t-Butylperoxypivalate
Method for producing water-soluble or water-swellable polymerizates with a very low residual monomer content, products produced according to this method and the use thereof
Method of preparing aqueous solutions of polyvinyl-pyrrolidone homopolymer of various molecular weights using a single initiator system consisting essentially of t-Butylperoxypivalate