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Improved rheology-modified grafts and adhesive blends

A rheological modification, adhesive technology, applied in the direction of graft polymer adhesives, adhesive types, adhesives, etc., can solve problems such as affecting interlayer adhesion and disadvantages

Active Publication Date: 2010-06-30
EQUSR CHEM LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While orientation imparts potential shrinkage and can also improve film gloss, clarity, barrier properties, and physical properties, it adversely affects interlayer adhesion between polyolefin resin barrier resin layers

Method used

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  • Improved rheology-modified grafts and adhesive blends
  • Improved rheology-modified grafts and adhesive blends

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative Embodiment 2

[0081] In order to demonstrate the improved results obtained with the inventive adhesive blends formulated using rheology-modified grafts with reduced relaxation times, the adhesive blend AB1 (inventive) and Comparative AB5 were evaluated as the tie layer in a 5-layer HDPE / tie layer / EVOH / tie layer / HDPE barrier film. 3 and 5-mil thick films were prepared on a Killion coextrusion line. The melt temperature at the die exit of the extruder was 210°C for the binder blend, 200°C for EVOH and 230°C for HDPE. The HDPE used for the film is a commercially available ethylene homopolymer (density 0.962 g / cm 3 ; MI 2g / 10min). EVOH is a commercial resin with an ethylene content of 32 wt% and a MFR of 3 g / 10 min.

[0082] Adhesion at the EVOH / HDPE interface was measured according to ASTM D 1876. Adhesion values ​​obtained using adhesive blend AB1 of the present invention were 1.48 and 2.92 lbs / in for 3- and 5-mil films, respectively. For the films prepared using the comparative tie laye...

Embodiment 3 and comparative Embodiment 4

[0084] The ability to vary the composition of the inventive adhesive blends and obtain improved adhesion in oriented barrier films is demonstrated by these examples in which AB2 (inventive) and comparative AB6 were used as 3-mil thick 5-layer Tie layer adhesive in LLDPE / tie layer / EVOH / tie layer / LLDPE barrier film was evaluated. The LLDPE resin used has a density of 0.916g / cm 3 And MI is 1g / 10min ethylene-butene-1 copolymer. The EVOH resin was the same as that used in Example 1. Melt temperatures (at the die) for film coextrusion were 200°C (LLDPE); 230°C (EVOH) and 220°C (tie layer adhesive). To obtain oriented 3-mil thick films, 22 mil thick sheets obtained from the coextrusion line were stretched in the machine direction at 115°C. Some stretched films prepared in this manner were also irradiated at 5 Mrad to determine the effect of the radiation on adhesion. Barrier films are often irradiated in industrial operations. Irradiated and non-irradiated oriented films prepare...

Embodiment 3

[0086] Example 3 (film prepared using AB2):

[0087] Orientation - no radiation 1.15

[0088] orientation-radiation 1.39

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Abstract

Rheologically-modified functionalized polyolefins and tie-layer adhesive blends formulated therewith which exhibit improved adhesion in multi-layer barrier films are provided. Multi-layer barrier shrink films having improved adhesion are also disclosed.

Description

technical field [0001] The present invention relates to rheology-modified functionalized polymers, improved adhesive blends prepared therewith, and multilayer barrier films having one or more layers of said improved adhesive blends. More specifically, the rheology modifying polymer is a maleic anhydride grafted ethylene polymer with reduced, ie shorter relaxation time. Background technique [0002] Multilayer barrier shrink films are widely used for packaging cheese and fresh and processed meat and poultry products. While specific constructions will vary in the number of layers and materials used for each layer, most constructions have layers of a barrier resin, such as ethylene-vinyl alcohol (EVOH) copolymer or a polyamide layer, and one or more polyolefin resins layer. When these layers are adjacent, a tie-layer adhesive is usually interposed to facilitate adhesion between these dissimilar, polar and non-polar substrates. [0003] A typical tie layer adhesive consists o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F8/46C09J151/06B32B27/08
CPCC08F255/00C09J123/04B32B7/12B32B27/08C08L23/0853C08L51/06C08L23/0869C08F255/02C08F8/46C09J123/0853C09J123/0869C08L23/06C09J151/06B32B27/32C09J123/06C09J123/0846B32B2307/7242B32B27/306B32B27/34B32B2439/70C08L2666/02C08L2666/04C08L2666/06C08L2666/24Y10T428/31913Y10T428/31757
Inventor C·D·李M·G·伯特罗斯
Owner EQUSR CHEM LP
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