C5 Resin Additive for Low-Temperature Hot Melt Application
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Solution Overview
Problem
Conventional hot melt adhesive compositions face challenges in achieving low-temperature applicability while maintaining bleedout resistance, as increasing plasticizer content to lower application temperature leads to increased oozing and poor adhesion.
Innovation Solution
Incorporating a C5 resin with specific viscosity and molecular weight characteristics as a plasticizer in the hot melt adhesive composition, which includes a C5 resin copolymer with controlled dienic, olefinic, and paraffinic fractions, and adjusting the P/O ratio to enhance low-temperature applicability and bleedout resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blending ratio of plasticizer is increased to enable low-temperature application (110 to 140° C.), then low-temperature applicability is improved, but bleedout resistance deteriorates due to increased oozing at ordinary temperature
Solution Approach 1:
The patent changes the molecular weight parameter of the plasticizer from conventional high molecular weight to specifically controlled low molecular weight (Mw: 100-2000, Mn: 50-1000). This parameter change enables the plasticizer to provide low-temperature applicability while maintaining bleedout resistance through its unique viscosity characteristics at different temperatures.
Solution Approach 2:
The patent uses a composite plasticizer system combining C5 resin (10-50 parts by mass) with conventional plasticizers (40-80 parts by mass). This composite approach leverages the low molecular weight characteristics of C5 resin to improve low-temperature performance while the conventional plasticizer matrix maintains overall adhesive stability and bleedout resistance.
2Reliability
If conventional plasticizers are used to maintain high-temperature application performance (160 to 180° C.), then high-temperature adhesion is maintained, but low-temperature applicability (110 to 140° C.) deteriorates
Solution Approach 1:
The patent introduces a low molecular weight plasticizer with specific parameters (Mw: 100-2000, Mn: 50-1000) that changes the temperature-viscosity relationship of the adhesive. This enables the adhesive to maintain appropriate viscosity and applicability at low temperatures (110 to 140° C.) while preserving high-temperature adhesion performance.
3Ease of operation
If the viscosity of hot melt adhesive composition is decreased to improve low-temperature applicability, then application at lower temperature is enabled, but bleedout phenomenon increases in usage environment
Solution Approach 1:
The patent changes the molecular weight parameters of the plasticizer to achieve optimal viscosity characteristics. The low molecular weight plasticizer (Mw: 100-2000) provides sufficient fluidity at application temperature (110 to 140° C.) for good applicability, while its specific molecular structure ensures viscosity increases adequately at usage temperature (ordinary temperature to 40° C.) to prevent bleedout.
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 C5 resin-based additive achieves low-temperature applicability with reduced bleedout, ensuring effective bonding and improved adhesion performance.
Implementation Method 1
A plasticizer plays a role in decreasing the viscosity of a hot melt adhesive composition, and hence, adjusting the blending ratio of the plasticizer enables the viscosity to be adjusted desirably. That is, such an adjustment allows application at a relatively low temperature (110 to 140° C.).
Implementation Method 2
decreasing the viscosity of a plasticizer in an application environment at a relatively low temperature (110 to 140° C.), and besides, decreasing the fluidity (i.e., increasing the viscosity) of a plasticizer in an environment of usage (at ordinary temperature to approximately 40° C.).
Data Source
AI summary
[Problem] Provided is an additive for a hot melt adhesive, with which additive a hot melt adhesive composition excellent in low-temperature applicability and bleedout resistance can be obtained.[Solution] The present invention is an additive for a hot melt adhesive, including a C5 resin, wherein the additive for a hot melt adhesive is characterized in that the viscosity performance index VI of the C5 resin is 1.0 or more and 10,000 or less.