Cyclic organosilicon compounds as electron donors in Zeigler-Natta catalyst systems for producing propylene polymer having high melt-flowability

Patent metadata

Field	Value
Publication number	US-10654947-B2
Application number	US-201113284602-A
Country	US
Kind code	B2
Filing date	Oct 28, 2011
Priority date	Oct 28, 2011
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

Cyclic organosilicon compounds having a structure represented by the general formula

and a method for using thereof as a component of catalysts for producing propylene polymer having a very high melt-flowability are disclosed. The cyclic organosilicon compounds are employed as external electron donors in Ziegler-Natta catalyst systems to dramatically improve the hydrogen response, and therefore the catalyst systems can be used to prepare polymer having high melt-flowability and high isotacticity at high yield.

First claim

What is claimed is:

1. A method for producing olefin homo-polymer or copolymer having high melt flowability at reduced hydrogen loading, comprising:
a. providing an external electron donor comprising an oxazasiline compound; and
b. reacting monomer in the presence of the external electron donor to produce the olefin homo-polymer or copolymer;
wherein the melt flow rate of the olefin homo-polymer or copolymer is greater than 20 g/10 minutes.

2. The method of claim 1 , wherein the oxazasiline compound is hexahydro-1-ethoxy-1-(2-methylpropyl)-1H-3H-pyrido[1,2-c][1,3,2]oxazasiline.

3. The method of claim 1 , wherein the oxazasiline compound is hexahydro-1-ethoxy-1-propyl-1H,3H-pyrido[1,2-c][1,3,2]oxazasiline.

4. The method of claim 1 , wherein the oxazasiline compound is hexahydro-1-ethoxy-1-methyl-1H,3H-pyrido[1,2-c][1,3,2]oxazasiline.

5. The method of claim 1 , wherein the oxazasiline compound is hexahydro-1,1-dimethoxy-1H,3H-pyrido[1,2-c][1,3,2]oxazasiline.

Assignees

• Zhang Lei
• Fang Yiqun
• Formosa Plastics Corp Usa

Inventors

• Zhang Lei
• Fang Yiqun

Classifications

• C08F4/58

  together with silicon, germanium, tin, lead, antimony, bismuth or compounds thereof · CPC title

• C08F10/00 Primary

  Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• C08F110/06

  Propene · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C08F4/6465

  containing silicium · CPC title