Propylene Interpolymer Adhesive Composition for Low-Viscosity Carpet Backing
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Solution Overview
Problem
Current adhesive compositions for modular carpet tiles have high viscosity, requiring specialized equipment and limiting marketability, and do not meet the mechanical performance requirements for carpet backing, such as low viscosity, good dimensional stability, and high tensile strain at break.
Innovation Solution
A composition comprising propylene/ethylene or propylene/alpha-olefin interpolymer with specific melting points and viscosities, combined with wax and oil, achieving a weight ratio of 0.30 to 4.0, which enhances mechanical properties and reduces viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ethylene/octene random copolymers or block copolymers are used in HMA formulations, then mechanical performance and dimensional stability are improved, but viscosity increases five to ten times compared to bitumen
Solution Approach 1:
The patent changes the chemical composition parameters by using propylene as the base polymer instead of ethylene/octene copolymers, and optimizes the wax-to-oil ratio parameter to achieve low viscosity while maintaining mechanical performance. This parameter change resolves the contradiction by finding a different compositional pathway that avoids the high viscosity issue.
Solution Approach 2:
The patent creates a composite material system combining propylene polymer with specific ratios of wax and oil components. This composite approach allows the formulation to achieve both low viscosity and good mechanical properties by synergistic interaction between components, rather than relying on high-performance polymers that inherently increase viscosity.
2Reliability
If HMA formulations with polymer, tackifier, wax and oil are used, then dimensional stability and tensile strain at break are improved, but specialized equipment is required for processing
Solution Approach 1:
The patent changes the formulation parameters by selecting propylene as the base polymer and optimizing the wax-to-oil ratio, which reduces viscosity to levels compatible with standard manufacturing equipment. This parameter optimization eliminates the need for specialized processing equipment while maintaining dimensional stability through the balanced composition.
3Ease of manufacture
If low viscosity is achieved for good processability, then manufacturing on standard lines is enabled, but mechanical properties such as modulus and tensile strain at break may be compromised
Solution Approach 1:
The patent formulates a composite material system where propylene polymer is combined with optimized amounts of wax and oil. The wax provides structural integrity and mechanical strength, while the oil ensures low viscosity for processability. This composite approach allows both low viscosity and good mechanical properties to coexist through synergistic component interaction.
Solution Approach 2:
The patent optimizes the wax-to-oil ratio parameter and propylene molecular weight parameters to achieve a balance where the formulation maintains low viscosity for easy processing while the propylene polymer matrix provides adequate mechanical strength and modulus.
Data Source
AI summary
A composition comprising the following components: a) at least one propylene/ethylene interpolymer or at least one propylene/alpha-olefin interpolymer, each interpolymer comprising the following properties: i) a melting point, Tm, from 60° C. to 85° C., ii) a viscosity (177° C.) from 3,000 cP to 30,000 cP; b) at least one wax; c) at least one oil; and wherein the composition has a weight ratio component b to component c from 0.30 to 4.0.