Process for the production of pvc in aqueous suspension using a mixture of initiators and an activity control agent
AssigneeInovyn Europe Limited
InventorThomas HERMANT
Life of this patent
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Abstract
Processes for the production of PVC, and in particular a process for the production of PVC by polymerisation of vinyl chloride which comprises (a) reacting an acyl halide with a peroxide in a reactor to form a diacyl peroxide, (b) in the same reactor, and without removing the diacyl peroxide formed in step (a), reacting an alkyl haloformate with a peroxide, to form a dialkyl peroxydicarbonate, and to produce a mixture comprising the diacyl peroxide and the dialkyl peroxydicarbonate, and (c) using the mixture comprising the diacyl peroxide and the dialkyl peroxydicarbonate as an initiator mixture for the polymerisation of vinyl chloride.
Claims17
A process for the production of PVC by polymerisation of vinyl chloride which comprises
- a. reacting an acyl halide with a peroxide in a reactor to form a diacyl peroxide,
- b. in the same reactor, and without removing the diacyl peroxide formed in step (a), reacting an alkyl haloformate with a peroxide, to form a dialkyl peroxydicarbonate, and to produce a mixture comprising the diacyl peroxide and the dialkyl peroxydicarbonate, and
- c. using the mixture comprising the diacyl peroxide and the dialkyl peroxydicarbonate as an initiator mixture for the polymerisation of vinyl chloride.
A process for the production of PVC which comprises polymerising vinyl chloride in suspension in an aqueous medium using a mixture of initiators and using an activity control agent, where the activity control agent comprises an alkali metal halide, nitrogen monoxide or an alkali metal nitrite, and where the mixture of initiators comprises
- a. a first initiator, which is a diacyl peroxide, said acyl having 2-8 carbon atoms, and
- a second initiator, which is a dialkyl peroxydicarbonate, said alkyl having 1-4 carbon atoms.
A composition which comprises at least a first initiator and a second initiator, wherein
- a. the first initiator is a diacyl peroxide, said acyl having 2-8 carbon atoms, and
- b. the second initiator is a dialkyl peroxydicarbonate, said alkyl having 1-4 carbon atoms,
- wherein
- the composition comprises either no acyl peroxycarbonate or comprises acyl peroxycarbonate in an amount which is less than 20% by weight relative to total weight of the first and second initiators, and
- the composition comprises either no carboxylic acid or carboxylate salts, or comprises carboxylic acid or carboxylate salts in an amount which is less than 20% by weight relative to the total weight of the first and second initiators.
Dependencies are inferred from the claim text.