Propylene Interpolymer Adhesive with Rosin Ester Tackifier
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Solution Overview
Problem
The adhesive industry faces challenges with the high cost and limited supply of hydrogenated tackifiers in hot melt adhesives (HMAs), leading to a need for alternative compositions that improve compatibility between polyolefin elastomers and rosin-based tackifiers while maintaining suitable adhesive performance, especially with reduced tackifier content.
Innovation Solution
A hot-melt adhesive composition comprising 45 wt% to 90 wt% of a propylene-based propylene/ethylene interpolymer with specific density and melt viscosity, 1 wt% to 30 wt% of a rosin ester polymer with high aliphatic carbon content, 1 wt% to 30 wt% of a wax, and 0.1 wt% to 3.0 wt% of a nucleating agent, which enhances adhesion properties and reduces tackifier usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogenated tackifiers are used to achieve superior adhesive performance, then adhesion properties are improved, but production cost increases and supply becomes limited
Solution Approach 1:
The patent replaces expensive hydrogenated tackifiers with cheaper rosin-based tackifiers. The composition uses rosin esters and modified rosins as alternative adhesive components that provide adequate performance at lower cost, directly addressing the contradiction between adhesive performance and production cost.
Solution Approach 2:
The patent modifies the chemical parameters of rosin-based tackifiers through esterification and other chemical modifications to improve their compatibility with polyolefin elastomers. By changing the molecular structure and chemical properties of the rosin esters, the formulation achieves better adhesive performance without relying on expensive hydrogenated tackifiers.
2Ease of manufacture
If rosin-based tackifiers are used to reduce cost, then production cost decreases, but compatibility with polyolefin elastomers deteriorates
Solution Approach 1:
The patent applies chemical modifications to rosin esters, including esterification with various alcohols and further modification to adjust molecular weight, polarity, and other key parameters. These parameter changes improve the compatibility between rosin-based tackifiers and polyolefin elastomers while maintaining cost advantages.
Solution Approach 2:
The patent creates composite adhesive formulations combining polyolefin elastomers with modified rosin esters and other compatible additives. This composite approach leverages the cost advantage of rosin-based materials while using the polyolefin matrix and auxiliary components to ensure overall composition stability and compatibility.
3Quantity of substance
If tackifier content is reduced to increase polymer content, then polymer content increases, but adhesion properties deteriorate
Solution Approach 1:
The patent modifies the molecular parameters of the tackifier components through controlled esterification and polymerization reactions. By adjusting molecular weight, functional group density, and chain length of the rosin esters, the formulation maintains effective adhesion at reduced tackifier concentrations, allowing higher polymer content in the final composition.
Solution Approach 2:
The patent introduces auxiliary components and modifiers that act as intermediaries between the polyolefin elastomer and the reduced amount of rosin-based tackifier. These intermediary substances enhance the adhesive effectiveness of the tackifier, allowing lower concentrations to achieve the same adhesion performance.
Data Source
Figure 1
AI summary
The present disclosure provides a composition. In an embodiment a composition is provided and includes: (A) a propylene-based interpolymer having the following: (i) a density from 0.850g/cc to 0.900g/cc; and (ii) a melt viscosity, at 177℃, less than, or equal to, 10, 000mPa·s.; and (B) a rosin ester containing the following: (i) greater than, or equal to, 75 mol％aliphatic carbon, based on total moles of carbon in the rosin ester; and (ii) less than, or equal to, 3.0 mol％ester group carbon, based on total moles of carbon in the rosin ester.