Multilayer Elastomeric Film Non-Blocking Skin Core

Solution Overview

Problem

Elastic compositions, such as films and fibers, tend to stick to themselves due to their low glass transition temperature and high tackiness, making rolling and lamination difficult, and attempts to add non-blocking layers or higher glass transition temperature resins often compromise their elastic efficiency.

Innovation Solution

A multilayered elastomeric composition with a core layer and one or more skin layers, where the skin layers include an olefin-based elastomer and a non-elastomeric polyolefin, forming 30 wt. % or less of the total weight, providing non-blocking properties without affecting elastic efficiency, and allowing for winding and lamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If elastic compositions are used, then excellent elastic efficiency is achieved, but they tend to stick to themselves making rolling and lamination difficult

Engineering Contradiction:

Improveelastic efficiencyVSAvoidrolling and lamination

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The elastic composition is divided into multiple layers with distinct functions: an inner elastic layer containing the elastomer for elastic efficiency, and an outer non-blocking layer with different polymer composition for non-sticking properties. This segmentation allows each layer to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite structure combining elastomeric polymers in the inner layer with non-elastomeric or differently composed polymers in the outer layer. This composite material approach enables the composition to exhibit both excellent elastic properties from the inner layer and non-blocking properties from the outer layer.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If a non-blocking outer layer is added, then non-blocking properties are achieved, but the stretch and retraction properties are negatively impacted

Engineering Contradiction:

Improvenon-blocking propertiesVSAvoidstretch and retraction properties

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The elastic composition is divided into multiple layers with distinct functions: an inner elastic layer containing the elastomer for elastic efficiency, and an outer non-blocking layer with different polymer composition for non-sticking properties. This segmentation allows each layer to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the elastic composition have different properties optimized for their specific functions. The inner layer has high elastomer content for elastic performance, while the outer layer has different composition for non-blocking properties. This local differentiation allows both requirements to be met simultaneously.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If elastic resins with higher glass transition temperatures are used, then non-blocking properties are achieved, but the stretch properties and lamination ability are impacted

Engineering Contradiction:

Improvenon-blocking propertiesVSAvoidstretch properties and lamination ability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The elastic composition is divided into multiple layers with distinct functions: an inner elastic layer containing the elastomer for elastic efficiency, and an outer non-blocking layer with different polymer composition for non-sticking properties. This segmentation allows each layer to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite structure combining elastomeric polymers in the inner layer with non-elastomeric or differently composed polymers in the outer layer. This composite material approach enables the composition to exhibit both excellent elastic properties from the inner layer and non-blocking properties from the outer layer.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20230040847A1Non-Blocking Multilayer Elastic Composition

Publication Date: 2023.02.09 KIMBERLY CLARK WORLDWIDE INC

AI summary

An elastomeric composition, including at least one skin layer and a core layer, with non-blocking properties such that the elastomeric composition can be wound is provided. The core layer includes an elastomer, and the skin layer includes an elastomer, which may be the same or different from the core layer, and a non-elastic polyolefin. Further, the skin layer can be present as a small portion of the total elastomeric composition, and may maintain the elastic efficiency of the composition.