(Co) polymerization of vinyl chloride in presence of stable nitroxyl free radical

A technology of nitroxyl radicals and free radicals, which is applied in the field of polymerization or copolymerization of vinyl chloride, and can solve problems such as molecular weight reduction

Inactive Publication Date: 2004-02-11
CIBA SPECIALTY CHEM HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is in contrast to traditional PVC polymerization where increasing the temperature will result in a decrease in molecular weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 23

[0162] Example 23: In situ reinitiation of butadiene

[0163] A suspension of 30 g vinyl chloride, 200 ml deionized water, 300 mg polyvinyl alcohol (Mowiol 8-88) and 0.1 mol% initiator (1,1-dimethylhexanoate) was stirred at 1000 rpm at 90°C for 21 hours , to react. The reactor was degassed by nitrogen flow and vacuum, then 30 g of butadiene was added. Stir for a further 21 hours at 90°C. The product was isolated (7 g), purified and analyzed as described above. Mn = 19,000, Mw = 39,000, PT = 2.0.

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Abstract

The present invention pertains to a process for controlled free radical polymerization or copolymerization of vinyl chloride at a temperature between 40 DEG C and 95 DEG C, at a pressure between 5 and 30 bar in the presence of a stable free nitroxyl radical.

Description

technical field [0001] The present invention relates to the polymerization or copolymerization of vinyl chloride in the presence of stable nitroxyl radicals. A further subject of the present invention is to use a stable nitroxyl radical as a polymerization regulator for vinyl chloride radical polymerization and a thermally unstable nitroxyl group that can be split into 1 nitroxyl radical and 1 A polymer or oligomer free radical polyvinyl chloride macroinitiator. Background technique [0002] Polyvinyl chloride (PVC) occupies a unique position among all polymers produced. PVC is less expensive, very versatile, and its versatility is almost limitless. Depending on their molecular weight, additives and stabilizers, applications range from rigid pipes and profiles to very soft, transparent flexible films. [0003] PVC can be produced from vinyl chloride monomer (VCM) by 3 different methods. The most widely used is suspension polymerization, accounting for about 75%. Small d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/38C08F2/00C08F4/00C08F14/06C08F293/00C08K5/34
CPCC08K5/34C08F293/005C08F2438/02C08F14/06C08F2/38C08F2/44
Inventor R·普费恩德纳T·万尼马赫D·布劳恩
Owner CIBA SPECIALTY CHEM HLDG INC
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