Heterophasic Propylene Copolymer Nucleation for Top-Load Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current heterophasic propylene copolymers used in packaging materials have limitations in achieving high top-load resistance, which affects the stackability and material efficiency of containers, leading to increased waste and costs.
Innovation Solution
A composition comprising a heterophasic propylene copolymer with a propylene-based matrix and a dispersed ethylene-α-olefin copolymer, combined with a nucleating composition that includes a cyclic dicarboxylate salt compound and talc, enhancing the mechanical properties and top-load resistance of the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional heterophasic propylene copolymers are used in packaging materials, then the material provides basic mechanical properties and cost-effectiveness, but the top-load resistance is insufficient, limiting stackability and requiring excess material
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of the propylene-based matrix (83-88 wt%) and dispersed ethylene-α-olefin copolymer (12-17 wt%), along with optimizing the melt flow index (35-50 g/10 min) and nucleating agent content. These parameter optimizations enable the material to achieve high top-load resistance with reduced material quantity, resolving the contradiction between strength improvement and material usage reduction.
Solution Approach 2:
The patent creates a composite material system by combining the propylene-based matrix with dispersed ethylene-α-olefin copolymer particles, forming a heterophasic structure. This composite approach leverages the complementary properties of both phases: the crystalline propylene matrix provides stiffness and strength, while the amorphous elastomeric dispersed phase provides impact resistance and toughness, achieving high top-load resistance with efficient material utilization.
2Strength
If the amount of dispersed ethylene-α-olefin copolymer is increased to improve impact strength, then the material becomes more viscous and harder to process, but if reduced for easier processing, then impact strength decreases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by optimizing the dispersed phase content to 12-17 wt% and controlling the melt flow index within 35-50 g/10 min. This balanced parameter selection ensures sufficient impact strength from the elastomeric phase while maintaining low enough viscosity for easy processing, avoiding the trade-off between impact strength and processability.
3Strength
If more material is used to achieve high top load, then the stackability and structural resistance improve, but the cost increases and environmental waste increases
Solution Approach 1:
The patent applies parameter changes by optimizing the heterophasic copolymer composition (propylene matrix 83-88 wt%, ethylene-α-olefin copolymer 12-17 wt%) and processing parameters (melt flow index 35-50 g/10 min) to maximize the efficiency of the material. This enables achieving high top-load resistance with minimal material quantity, eliminating excess material waste and reducing environmental impact while maintaining structural integrity.
Solution Approach 2:
The patent uses composite material design with the heterophasic structure to achieve high top-load resistance efficiently. The synergistic combination of the crystalline propylene matrix and amorphous elastomeric dispersed phase creates a material that maximizes strength-to-weight ratio, allowing high top-load performance with reduced material quantity, thus preventing waste and reducing costs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed composition significantly improves the top-load resistance of containers, allowing for better stackability and reduced material usage while maintaining other mechanical properties like impact strength and stiffness.
Implementation Method 1
the nucleating composition comprises (i) a first nucleating agent, which comprises a cyclic dicarboxylate salt compound; and (ii) a second nucleating agent, which comprises talc
Data Source
AI summary
The invention relates to a composition comprising (A) a heterophasic propylene copolymer and (B) a nucleating composition, wherein (A) the heterophasic propylene copolymer consists of (a) a propylene-based matrix, wherein the propylene-based matrix consists of a propylene homopolymer and wherein the propylene-based matrix is present in an amount of 83 to 88 wt %, preferably 84 to 88 wt %, based on the total heterophasic propylene copolymer and (b) a dispersed ethylene-α-olefin copolymer, wherein the dispersed ethylene-α-olefin copolymer is present in an amount of 12 to 17 wt %, preferably of 12 to 16 wt %, based on the total heterophasic propylene copolymer and wherein the sum of the total amount of propylene-based matrix and total amount of the dispersed ethylene-α-olefin copolymer in the heterophasic propylene copolymer is 100 wt %, wherein the amount of ethylene in the ethylene-α-olefin copolymer is 40 to 60 wt % and wherein the heterophasic propylene copolymer has a melt flow index of 35 to 50 g/10 min as determined according to ISO1133 at 230° C. and 2.16 kg and wherein (B) the nucleating composition comprises (i) a first nucleating agent, which comprises a cyclic dicarboxylate salt compound; and (ii) a second nucleating agent, which comprises talc, wherein the cyclic dicarboxylate salt compound has the formula (I):Ph(COO—)2Ca2+ (I).