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Ethylene-based polymer composition with branched and process for producing same

A technology for polymers, compositions, applied in the field of ethylene-based polymer compositions with branching and processes for producing the compositions, capable of solving problems such as low molecular weight extractable fractions, low crystallinity, etc.

Pending Publication Date: 2022-07-08
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process conditions required to obtain modified LDPE with high levels of branching often result in final products with lower crystallinity and higher levels of low molecular weight extractable fractions

Method used

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  • Ethylene-based polymer composition with branched and process for producing same
  • Ethylene-based polymer composition with branched and process for producing same
  • Ethylene-based polymer composition with branched and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

example

[0169] Polybutadiene (Additive A: Nisso PB B-1000, having structure I) was supplied by NipponSoda, Co.. The properties of this material are listed in Table 1 below.

[0170] Table 1

[0171]

[0172] 1 Provided by Soda Co., Ltd.

[0173] 2 Determined by GPC

[0174] 3 Calculated by dividing Mn by the Mw of the butadiene monomer (hydrocarbon molecule) and multiplying by the fractional number of terminal olefin groups in n and internal olefin groups in m. Example: Mn = 1200 g / mol, Avg n = (1200 g / mol) / (54.09 g / mol of butadiene monomer) = 22 repeat units * 0.85 (terminal / total olefins) = average 18.8 terminal vinyl groups / chain

[0175] Polymerization: Tubular Reactor

[0176] Comparative Sample 1

[0177] The polymerization is carried out in a tubular reactor with three reaction zones. In each reaction zone, pressurized water is used to cool and / or heat the reaction medium by circulating it through the jacket of the reactor. The inlet pressure was 222 MPa and the ...

example 1

[0180] The polymerization was carried out in a tubular reactor with three reaction zones, as discussed above for Comparative Sample 1 . All process conditions were the same as Comparative Sample (CS) 1 except Inventive Example 1, where Additive A was added to the first zone. Additional information can be found in Tables 2 and 3.

example 2

[0182] The polymerization was carried out in a tubular reactor with three reaction zones, as discussed above for Inventive Example 1 . All process conditions were the same as Inventive Example (IE) 1 except that additional additive A was fed to the first zone. Additional information can be found in Tables 2 and 3.

[0183] Table 2: Pressure and Temperature Conditions for Comparative and Inventive Examples

[0184]

[0185] Table 3: Polymer properties of the examples

[0186]

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Abstract

The present disclosure provides an ethylene-based polymer composition formed by high pressure (greater than or equal to 100 MPa) free radical polymerization. An ethylene-based polymer composition comprises a mixture of an ethylene monomer and hydrocarbon molecules, each hydrocarbon molecule comprising three or more terminal olefin groups. The ethylene-based polymer has a melt index (MI) of 0.1 to 1.0 g / 10 min.

Description

Background technique [0001] The level of branching in low density polyethylene (LDPE) is primarily attributable to the reactor design and polymerization conditions used to make LDPE. Branching agents have been used to increase the level of branching in LDPE. However, the process conditions required to obtain modified LDPE with a high level of branching generally result in a final product with lower crystallinity and higher content of low molecular weight extractables. Therefore, there is a need for modified LDPEs with high levels of branching that can be prepared while maintaining good polymer properties. SUMMARY OF THE INVENTION [0002] The present disclosure provides an ethylene-based polymer composition formed by high pressure (greater than or equal to 100 MPa) free radical polymerization. The ethylene-based polymer composition comprises a mixture of ethylene monomers and hydrocarbon molecules, each hydrocarbon molecule comprising three or more terminal olefinic groups...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/02C08F10/02C08F110/02C08F210/02C08F290/04C08L23/04
CPCC08F10/02C08F110/02C08F210/02C08F290/122C08F2/00C08F2/38C08F236/22C08F2500/11C08F2500/12C08F2500/29C08F4/38C08F290/062
Inventor A·L·克拉索夫斯基I·A·康斯坦丁诺夫S·芒贾尔S·W·埃瓦尔特
Owner DOW GLOBAL TECH LLC
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