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Polypropylene melt-blown sealant films for retort packaging

A retort-resistant, polypropylene homopolymer technology, applied in the field of heat-sealing film and gusset packaging bags, can solve the problems of insufficient sealing strength and insufficient adhesion

Inactive Publication Date: 2010-12-29
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantageously, although the resulting films have improved toughness and appearance (especially improved hammer skin resistance) compared to cast crystalline polypropylene films, they generally have insufficient adhesion, especially Insufficient seal strength after cooking

Method used

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  • Polypropylene melt-blown sealant films for retort packaging
  • Polypropylene melt-blown sealant films for retort packaging
  • Polypropylene melt-blown sealant films for retort packaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099]A coupled impact propylene copolymer is made by reacting C 104-01 with a coupling agent. C 104-01 is a medium impact propylene copolymer available from The Dow Chemical Company. C104-01 has a density of 0.900 g / cc, a melt flow rate of 1.2 g / 10 minutes, about 3 to about 12 wt. % of units derived from ethylene, and a tensile modulus of 167,000 p.s.i. (according to ISO 527-2). The coupling agent is diphenyloxide bissulfonate azide ("DPO-BSA"). The DPO-BSA is a molecular melt with 23.8% by weight DPO-BSA, as described in Table 2 below.

[0100] Table 2

[0101] DPO / BSA (diphenyl ether bissulfonyl azide): (N 3 SO 2 ) 2 C 6 h 6

[0102] Molecular melt: 23.8 wt% DPO / BSA

[0103] Sulfur content in molecular melt: 0.238*0.1684=0.0400

[0104]

[0105] C 104-01 has a continuous phase of polypropylene homopolymer in which is dispersed an ethylene-propylene copolymer elastomeric phase. The ethylene-propylene copolymer comprises 50% by weight of monomer units derived ...

Embodiment 2

[0124] A sealant layer having a multilayer structure is provided. By introducing VERSIFY TM Coextrusion of 2000 plastomers and CIPC-1 resins into multilayer coextruded blown film structures to produce sealant films. The multilayer structure can have the following forms: A / B / A, B / B / A, or B / A / A. When the structure includes multiple A layers, the thickness of each A layer may be the same or different. Similarly, when the structure includes multiple B layers, each B layer may have the same or different thickness. The composition of Layer A and the composition of Layer B are provided below.

[0125] Layer A VERSIFY TM 2000 Plastomer

[0126] Tier B CIPC-1 or

[0127] 70%CIPC-1+30%VERSIFY TM 2000 Plastomer

[0128] Two examples of A / B / A coextruded blown film structures are shown in Table 5. Both examples provide high retort temperature resistance and excellent blown film processability through the use of a high melt strength, high temperature resistant CIPC-1 core layer....

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Abstract

A polypropylene containing resin composition suitable for use in forming films by the air quenched melt-blown film process for use as a sealing layer in a laminate for retort pouches, The resin composition includes from 80 to 98 percent by weight of a coupled impact propylene copolymer and from 2 to 20 percent by weight of a propylene-ethylene copolymer having from 2 to 10 percent by weight unitsderived from ethylene, wherein the composition has a melt flow rate of from 0.1 to 2.5 grams / 10 minutes.

Description

[0001] priority [0002] This application claims priority to US Application Serial No. 60 / 992,453, filed December 5, 2007, which is incorporated herein by reference in its entirety. Background technique [0003] This disclosure relates to melt blown polypropylene sealant films for packaging applications, and in particular to such films that can be used as heat seal layers in multilayer films capable of forming flexible containers or retortable A retortable flexible pouch is sealed and heated to a temperature sufficient to pasteurize or sterilize its contents. [0004] Retort flexible packaging comes in a variety of shapes and sizes. Two common formats are "pillow" and "gusset" or "stand-up" bags. These bags are significantly lighter than other structures and are a lower cost structure for preserving and protecting food, condiments, pharmaceuticals and sterile solutions and are widely used commercially. A typical pouch is constructed of one or two sheets of laminate materia...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08L23/12C08L23/14C08J5/18C08L23/08
CPCC08L23/0815C08L23/12C08J2323/10C08J5/18C08L23/142C08J2323/12C08L23/10Y10T428/1334C08L2666/06
Inventor 格兰特·W·杜吉德罗莎娜·德马科
Owner DOW GLOBAL TECH LLC
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