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High transparent polyethylene formulation with 3M™ Ceramic Microspheres for packaging films

IP.com Disclosure Number: IPCOM000249779D
Publication Date: 2017-Apr-03
Document File: 3 page(s) / 314K

Publishing Venue

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Abstract

Linear low-density polyethylene (LLDPE) film has been widely used for packaging applications. Commercial LLDPE pellets made from the resin makers have various inorganic and organic additives such as anti-blocking agent (AB agent), processing aid, slip agent to improve the properties related to the productivity. Resin makers has been using various types of anti-blocking agents such as talc, calcium carbonate, zeolite, mica typically in concentrations ranging from about 1,500 to 5,000 ppm.

3M Ceramic Microspheres (CM) is spherical type of inorganic filler with 1.53 of reflective index. This value is as close as the refractive index of polyethylene, so CM used polyethylene film could have high transparency.

In the disclosed invention, the formulation with CM is demonstrated. The formulations of LLDPE could have high transparency and good anti-blocking property. LLDPE film could be easily separated without any loss of transparency by using 3M™ Ceramic Microspheres (CM) as spherical shape of inorganic filler.

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High transparent polyethylene formulation with 3M™ Ceramic Microspheres for packaging films

1. Introduction

Linear low-density polyethylene (LLDPE) film has been widely used for packaging applications. Commercial LLDPE pellets made from the resin makers have various inorganic and organic additives such as anti-blocking agent (AB agent), processing aid, slip agent and so forth to improve the properties related to the productivity. Resin makers has been using various types of anti-blocking agents such as talc, calcium carbonate, zeolite, mica and so on typically in concentrations ranging from about 1,500 to 5,000 ppm.

Figure 1. Scheme for anti-blocking property

3M Ceramic Microspheres (CM) is spherical type of inorganic filler with 1.53 of reflective index. This value

is as close as the refractive index of polyethylene, so CM used polyethylene film could have high transparency.

Table 1. Reflective indexes of polyethylene and various fillers Reflective Index Polyethylene CM Talc Zeolite Syn. silica

1.51 – 1.54 1.53 1.56 1.48 1.46

In the disclosed invention, the formulation with CM is demonstrated. The formulations of LLDPE could have

high transparency and good anti-blocking property. LLDPE film could be easily separated without any loss of transparency by using 3M™ Ceramic Microspheres (CM) as spherical shape of inorganic filler.

Figure 2. Concept of the disclosed invention

2. Experimental

2.1 Materials

3M™ Ceramic Microspheres W-410 and W-610 were used in this demonstration. Their typical properties are

shown in the table below. W-410 and W-610 are tested for verifying anti-blocking property.

Table 2. Basic properties of 3M™ Ceramic Microspheres Ceramic

Microsphere Particle size (um) Surface area

(m2/cc) Oil absorption (mg/100 oil) D10 D50 D90 D95

W-410 1 4 15 24 3 44 W-610 1 10 28 40 3 28

Marflex® 7109, linear low-density polyethylene (LLDPE) is used as the base resin that does not contain any

additives was obtained from Chevron Philips Chemicals, The Woodlands, TX. As a processing additive,

fluoropolymer based 3MTMDynamarTM Polymer Processing Additive FX 9613 (PPA, FX-9613) was added to

the formulation.

2.2 Processing

According to the formulation, LLDPE film was produced by using a blown-film extrusion line at 230℃. For

good dispersion, PPA masterbatch (3% FX-9613 with LLDPE) was used. Before putting the resin and additives

into hopper, LLDPE, CM and PPA masterbatch were dry-blended. The blown film samples was cut after 10

minutes when the final thickness of films was in target range.

Table 3. Formulation for high transparent LLDPE films with anti-blocking property test

Component (Unit : %)

Sample

Control 4-1 4-3 4-5 4-10 6-1 6-3 6-5 6-10

LLDPE 96.70 96.60 96.40 96.20 95.70 96.60 96.40 96.20 95.70

PPA MB 3.30 3.30 3.30 3.30 3.30 3.30 3.30 3.30 3.30

W-410 0.00 0.10 0.30 0.50 1.00 0.00 0.00 0.00 0.00

W-610 0.00 0.00 0...