RU2001111024A

RU2001111024A - CONTINUOUS DOSING OF INITIATORS VERY QUICK ACTION IN THE POLYMERIZATION PROCESS

Info

Publication number: RU2001111024A
Application number: RU2001111024/04A
Authority: RU
Inventors: СВИТЕН Андреас Петрус ВАН; Ханс Вестмейзе; Якобус СХУТ
Original assignee: Акцо Нобель Н.В.
Priority date: 1998-09-21
Filing date: 1999-09-10
Publication date: 2003-02-10

Claims

1. A method of polymerizing a vinyl chloride monomer and optionally other monomers, comprising using one or more organic peroxides, with dosing at least a portion of the peroxide in the polymerization mixture at a reaction temperature, characterized in that basically all of the organic peroxide used in the polymerization process has a half-life of 0.05-1.0 hours at the polymerization temperature, and that said peroxide is dosed continuously or periodically over a period of 0.17 hours or more, at Slovenia that the polymerization is not a copolymerization of a vinyl chloride monomer and propylene using α-cumyl peroxineodecanoate as an initiator.

2. The method of claim 1, wherein the peroxide dosed at the reaction temperature is dosed continuously.

3. The method according to p. 1 or 2, in which at least 10% m / m of the total amount of initiator is present at the beginning of the polymerization reaction, or before heating the reaction mixture to the desired reaction temperature, as in the case of the method with a cold start, or when the temperature of the reaction mixture is at the indicated reaction temperature, as is the case with hot start processes.

4. The method according to p. 3, in which 10-40% m / m, more preferably 20-40% m / m, of the total amount of peroxide is present at the beginning of the polymerization process.

5. The method according to any one of paragraphs. 1-4, in which the peroxide or the remaining peroxide is metered at the reaction temperature for a period of 1, preferably 2, and more preferably 4 hours

6. (Co) polymer based on vinyl chloride, obtained by any of the methods according to PP. 1-5, containing less than 50 wt. including residual peroxide, based on one million parts by weight of (co) polymer, when measured immediately after polymerization and drying the (co) polymer for 1 h at 60 ^o C.

7. The vinyl chloride-based (Co) polymer according to claim 6, used in the profiling process, comprising heating the (co) polymer to a temperature above its melting point.