Process for the gas-phase (co-)polymerization of olefins in a fluidized bed reactor

1. A process for the gas-phase (co-)polymerization of olefins comprising (co-)polymerizing olefins in a fluidized bed, gas-phase reactor in the presence of a process aid additive wherein the additive is at least one component selected from the group consisting of

(1) a glycerol ester of a fatty acid,

(2) a sorbitan ester of a fatty acid, and

(3) an alkylamine carboxylate

along with at least one component selected from the group consisting of

(4) hydrogen peroxide and/or water, and

(5) an alkali metal halide.

2. The process according to claim 1 wherein the process aid additive is a mixture of at least one component selected from (1), (2) and (3) with both (4) hydrogen peroxide and/or water and (5) an alkali metal halide.

3. The process according to claim 1 wherein the glycerol ester is selected from one or more of glycerol monooleate, glycerol monostearate, glycerol monolaurate or glycerol monoricinoleate and their derivatives.

4. The process according to claim 1 wherein the sorbitan ester is selected from one or more of sorbitan monoleate, sorbitan, trioleate, sorbitan monostearate, sorbitan monolaurate, sorbitan monoricinoleate, or sorbitan polyoxethylene ester and their derivatives.

5. The process according to claim 1 wherein the alkylamine carboxylate is one or more alkylamine ethoxylates.

6. The process according to claim 1 wherein the alkali metal halide is an alkali metal chloride.

7. The process according to claim 3 , wherein the glycerol ester is glycerol monoleate and/or glycerol monostearate.

8. The process according to claim 4 , wherein the sorbitan ester is sorbitan trioleate and/or sorbitan polyoxyethylene ester.

9. The process according to claim 6 , wherein the alkali metal chloride is sodium chloride.