Multilayer Rolling Body Composition for Coating and Shock Resistance

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Solution Overview

Problem

Existing multilayer articles for compression molding with propylene polymers do not adequately address coating properties post-molding, despite providing excellent shock resistance.

Innovation Solution

A multilayer article comprising specific layer compositions and thickness ratios, with layer A containing a propylene polymer, a resin with polar groups, and a thermoplastic elastomer, and layer B containing a propylene polymer and inorganic filler, optimized for improved coating properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a multilayer article with propylene polymer is used for compression molding to improve shock resistance, then shock resistance is improved, but coating properties after molding deteriorate

Engineering Contradiction:
Improveshock resistanceVSAvoidcoating properties
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The molded article is divided into multiple layers with distinct compositions: a first layer containing propylene polymer and inorganic filler for shock resistance, and a second layer containing polar resin for coating 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 molded article have different material compositions tailored to local requirements. The first layer uses propylene polymer with inorganic filler where shock resistance is needed, while the second layer uses polar resin where coating adhesion is required, achieving local optimization of properties.

Inventive Principle:
Principle #3Local quality

2Reliability

If layer thickness is increased to improve coating properties, then coating properties are improved, but the proportion of shock-resistant material decreases

Engineering Contradiction:
Improvecoating propertiesVSAvoidshock resistance
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The invention optimizes the thickness ratio parameter between layers, specifying that the first layer thickness is 0.5-10 mm and the second layer thickness is 0.01-5 mm. By controlling these dimensional parameters within specific ranges, the invention achieves the optimal balance between coating properties and shock resistance.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS12508749B2Multilayer body for rolling, rolled body and method for producing rolled body
Publication Date: 2025.12.30 SUMITOMO CHEM CO LTD
  • US12508749B2 patent drawing

AI summary

A multilayer body for rolling includes a layer A and a layer B. The body is configured such that: if the sum of the total thicknesses of layers A and B is taken as 100%, the total thickness of layer A is from 0.5% to 10% (inclusive) and the total thickness of layer B is from 90% to 99.5% (inclusive), and layer A is arranged in at least one surface. Layer A contains a specific amount of a propylene polymer component, a specific amount of a specific resin component that has a polar group in the molecular chain, and a specific amount of a specific thermoplastic elastomer component that does not have a polar group in the molecular chain. Layer B contains a specific amount of a propylene polymer component and a specific amount of an inorganic filler.