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Polymer composition and sealant layer having said composition

A technology of polymer and composition, applied in the direction of synthetic resin layered products, layered products, transportation and packaging, etc., can solve problems such as increased cost, waste generation, product substandard, etc., to achieve improved heat sealing properties, low heat sealing Initiation temperature, effect of high hot tack strength

Active Publication Date: 2016-01-13
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, heat-sealed closures that result in product rejection, waste, and increased expense will be foregone

Method used

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  • Polymer composition and sealant layer having said composition
  • Polymer composition and sealant layer having said composition
  • Polymer composition and sealant layer having said composition

Examples

Experimental program
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Effect test

Embodiment

[0211] 1. Polymer composition

[0212] The block composite, component (C), was prepared as described at pages 82-91 of co-pending US Patent Application 61 / 248,160, filed October 2, 2009, which is incorporated herein by reference in its entirety.

[0213] The polymerization conditions used to produce block composite Examples 02, 03 and 14 are provided in Table 3 below. The physical properties of the resulting block composites 02, 03 and 14 are provided in Table 4.

[0214] The catalyst system includes the catalyst ([[rel-2',2'''-[(1R,2R)-1,2-cyclohexanediylbis(methyleneoxy-κO)]bis[3-(9H -carbazol-9-yl)-5-methyl[1,1'-biphenyl]-2-olato-κO]](2-)]dimethyl-hafnium) and cocatalyst, tetrakis(pentafluorobenzene base) methyl di(C of boronic acid 14-18 Alkyl) ammonium salt mixture, by long chain trialkylamine (Armeen TM M2HT, available from Akzo-Nobel, Inc.), HCl and Li[B(C 6 f 5 ) 4 ] prepared by reaction, basically as disclosed in Example 2 of USP5,919,9883, purchased from Bould...

Embodiment 02、03 and 14

[0219] Each block composite example 02, 03 and 14 contains

[0220] (i) crystalline isotactic propylene homopolymer (iPP);

[0221] (ii) ethylene / propylene polymers (EP); and

[0222] (iii) Block copolymers (diblocks) comprising iPP-blocks and EP-blocks.

[0223] Table 4 provides a summary of the analysis of block composite Examples 02, 03 and 14. Properties in Table 4 are for block composite (C) unless otherwise stated.

[0224] Table 4 Analytical Summary of Block Composites, Component (C) - Examples

[0225]

[0226] 2. Membrane

[0227] A polymer composition comprising (A) propylene / α-olefin interpolymer, (B) ethylene-based polymer, and (C) block composite was coextruded into a film structure. Components (A), (B) and (C) were dry blended before being added to the feed hopper of the extruder.

[0228] Three-layer coextruded films were produced using a Colin Extrusion Blown Film Line (ExtrusionBlown Film Line) with three extruders. Film production conditions are sho...

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Abstract

A polymer composition is disclosed herein. The polymer composition comprises: (A) a propylene / α-olefin interpolymer; (B) an ethylene-based polymer; (C) a block composite comprising: i) a propylene-based crystalline polymers; ii) ethylene / α-olefin polymers; and iii) block copolymers comprising propylene-based crystalline blocks and ethylene / α-olefin blocks. When formed into a film, film layer or flexible container such as a retort pouch, the polymer composition provides an improved heat seal.

Description

Background of the invention [0001] Plastic films find use in a wide range of packaging applications, such as bags, containers, cups, sachets, tubes and trays. Laminates, monolayer films and multilayer films having heat sealable layers are commonly used in "form, fill and seal" (FFS) machines. The FFS machine produces a continuous flow of film packages that can be closed with a film-to-film seal. [0002] A film-to-film heat-seal closure is formed by placing the film between opposing heat-seal jaws, applying pressure to the heat-seal clamps and applying heat in excess of the seal-initiating temperature of the film. Heat seal closures are generally strongest when prepared after the seal has cooled to ambient temperature. To increase throughput, packs are filled with product before the heat seal has had time to cool completely. Therefore, there is a need for a heat-sealed closure to provide sufficient strength very quickly without cooling the package to ambient temperature. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14B32B27/32C08F297/08C08J5/18
CPCC08F297/08C08J5/18C08J2323/14C08J2423/06C08J2453/00C08L23/06C08L23/14C08L53/00B32B27/08Y10T428/1334Y10T428/139Y10T428/31909B32B27/32B32B1/02C08L2666/04
Inventor 梁文斌K·L·沃尔顿G·R·马钱德
Owner DOW GLOBAL TECH LLC
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