Multi-Layer Plastic Gloss via Styrenic Copolymer Outer Layer

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Solution Overview

Problem

High-density polyethylene (HDPE) products have low surface gloss, which affects their marketability, while styrenic copolymers, used to improve gloss, are sensitive to environmental stress cracking and lack moisture barrier properties, and coextrusion with other polymers like MDPE results in increased surface friction and adhesion issues.

Innovation Solution

A multi-layer plastic structure with a high-density polyethylene or polyolefin inner layer and a styrenic copolymer outer layer, which provides resistance to environmental stress cracking and improved gloss, along with a separate center layer for regrind material to minimize waste and maintain properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If HDPE is used to provide environmental stress crack resistance and moisture barrier properties, then reliability is improved, but surface gloss deteriorates

Engineering Contradiction:

Improveenvironmental stress crack resistanceVSAvoidsurface gloss

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies composite materials by creating a multi-layer structure where an HDPE inner layer provides environmental stress crack resistance and moisture barrier properties, while an outer layer (styrenic copolymer or MDPE) provides high surface gloss. This composite approach allows the bottle to simultaneously achieve both reliability and aesthetic quality that neither material could provide alone.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If styrenic copolymers are used to improve surface gloss, then surface gloss is improved, but environmental stress crack resistance deteriorates

Engineering Contradiction:

Improvesurface glossVSAvoidenvironmental stress crack resistance

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent uses composite materials to combine the high-gloss properties of styrenic copolymers with the stress crack resistance of HDPE in a multi-layer structure, allowing the outer layer to provide gloss while the inner layer provides reliability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent segments the bottle structure into multiple functional layers: an inner HDPE layer for stress crack resistance and an outer styrenic copolymer layer for gloss. This segmentation allows each layer to specialize in its strength without compromising the other.

Inventive Principle:

Principle #1Segmentation

3Illumination intensity

If coextrusion with MDPE is used to improve surface gloss, then surface gloss is improved, but surface friction increases

Engineering Contradiction:

Improvesurface glossVSAvoidsurface friction

Core Design Contradiction:

Illumination intensityVSEase of operation

Solution Approach 1:

The patent changes the material parameters by selecting specific MDPE grades with optimized balance between gloss and friction, or by controlling the thickness and composition of the outer layer to achieve desired surface properties while maintaining processability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9289955B2System and method for creating high gloss plastic items via the use of styrenic copolymers as a coextruded layer

Publication Date: 2016.03.22 CHEVRON PHILLIPS CHEMICAL COMPANY LP

AI summary

The present techniques provide multi-layer plastic structures and methods for making such. The multi-layer plastic structures include an inner surface made from a polyolefin resin, and resistant to environmental stress cracking, and an outer surface that includes a styrenic copolymer. The outer surface has a kinetic coefficient of friction with itself of 0.42 and a static coefficient of friction with itself of 0.44.