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Propylene/ethylene copolymer film for heat seal

A random copolymer, ethylene technology, applied in the direction of lining/internal coating, other chemical processes, synthetic resin layered products, etc., can solve the problems affecting sealing parameters, hardness and gloss reduction, etc., to achieve improved optical properties, Effect of low hot viscosity initiation temperature, improved optical properties

Active Publication Date: 2014-04-02
WR GRACE & CO CONN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, if a technician adds more ethylene to a propylene / ethylene random copolymer, toughness and haze are improved while hardness and gloss are reduced
Likewise, too much ethylene can adversely affect sealing parameters such as heat seal initiation temperature and / or hot tack initiation temperature
Conversely, when the ethylene content in propylene / ethylene random copolymer resins is reduced, hardness is improved while toughness and optical properties are adversely affected

Method used

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  • Propylene/ethylene copolymer film for heat seal
  • Propylene/ethylene copolymer film for heat seal
  • Propylene/ethylene copolymer film for heat seal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] 2. Embodiment 1 and comparative sample 7

[0135] A. Example 1 - Synthesis of SPAD-containing procatalyst compositions

[0136] 351 g of mixed magnesium / titanium halide alkoxide were stirred in a mixture of 1.69 kg chlorobenzene and 4.88 kg titanium(IV) chloride at ambient temperature. After 10 minutes, a solution of 164.5 g of 5-tert-butyl-3-methyl-1,2-phenylene dibenzoate in 750 mL of chlorobenzene was added, followed by 0.46 kg of chlorobenzene. The mixture was stirred at 100°C for 60 minutes, allowed to stand, and then filtered at 100°C. The solid was stirred in 3.16 kg chlorobenzene at 70°C for 15 minutes, allowed to stand, then filtered at 70°C. The solid was stirred in a mixture of 2.36 kg chlorobenzene and 4.84 kg titanium(IV) chloride and after 10 minutes 109.7 g of 5-tert-butyl-3-methyl-1,2-phenylene dibenzoate were added Solution in 416 g chlorobenzene, followed by 0.20 kg chlorobenzene. The mixture was stirred at 105-110°C for 30 minutes, allowed to stan...

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PUM

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Abstract

The disclosure provides compositions, films and articles containing a random propylene / ethylene copolymer and a substituted phenylene aromatic diester. Polymerization with an improved catalyst system increases the amount of ethylene incorporated into the random propylene / ethylene copolymer backbone which results in improved thermal properties, improved optical properties, and improved heat seal properties.

Description

Background of the invention [0001] The present application provides compositions, films and articles comprising propylene / ethylene random copolymers. [0002] Optical performance, toughness, hardness and seal strength are important performance requirements for packaging. Current propylene / ethylene random copolymers provide optimum properties at the expense of other properties. Generally, if a technician adds more ethylene to a propylene / ethylene random copolymer, toughness and haze are improved while hardness and gloss are reduced. Likewise, too much ethylene can adversely affect sealing parameters such as heat seal initiation temperature and / or hot tack initiation temperature. Conversely, when the ethylene content in the propylene / ethylene random copolymer resin is reduced, hardness is improved while toughness and optical properties are adversely affected. [0003] There is a recognized need in the art for propylene / ethylene random copolymers having improved hardness while...

Claims

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Application Information

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IPC IPC(8): C08F4/646C08F4/649C08F4/651C08F210/06C08J5/18
CPCC09K3/1006C08J5/18B32B27/08C08F210/06B65D25/14C08J2323/08Y10T428/31938C08F4/651C08F210/16C08F2500/26
Inventor L-M.陶C-J.周J.卡托P.S.马丁W.G.希尔德
Owner WR GRACE & CO CONN
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