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
CN103703031AActive Publication Date: 2014-04-02WR GRACE & CO CONN
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
WR GRACE & CO CONN
Publication Date
2014-04-02

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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.
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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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