Flexible Microsphere Articles with Aliphatic Polyurethane Binder
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Solution Overview
Problem
There is a need for flexible microsphere articles that offer high temperature stability, low coefficient of friction, resistance to organic solvents, and are free of visible defects, which existing decorative and protective surfaces fail to provide effectively.
Innovation Solution
The development of flexible microsphere articles comprising a binder resin layer with an aliphatic polyurethane polymer and partially embedded microspheres, where the specific chemical composition and structure impart a glass transition temperature of 10°C or less and a storage modulus that changes minimally from 25°C to 175°C, ensuring durability and low friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass beads are used to create durable decorative surfaces, then scratch and wear resistance is improved, but the surfaces develop visible defects and cracks when used in broad temperature ranges
Solution Approach 1:
The patent changes the chemical composition parameters of the binder resin by specifying an aliphatic polyurethane polymer with poly(alkoxy) polyol soft segments essentially free of crosslinker, achieving a glass transition temperature of 10°C or less. This parameter change allows the binder to remain flexible and defect-free across broad temperature ranges while maintaining the durability provided by the glass bead microspheres.
2Strength
If existing binder resins are used with glass bead microspheres, then durability is achieved, but temperature stability above 100°C deteriorates
Solution Approach 1:
The patent modifies the binder resin parameters by selecting an aliphatic polyurethane polymer with specific soft segment composition (poly(alkoxy) polyol) that is essentially free of crosslinker. This results in a glass transition temperature of 10°C or less, enabling the binder to maintain its binding properties and flexibility at elevated temperatures above 100°C while preserving durability.
3Ease of operation
If conventional polymeric films are used, then flexibility is achieved, but resistance to organic solvents and high temperature stability are insufficient
Solution Approach 1:
The patent creates a composite material system combining glass bead microspheres with an aliphatic polyurethane binder resin. The binder resin comprises hard segments and soft segments with specific chemical identities, where the soft segments are poly(alkoxy) polyol essentially free of crosslinker. This composite structure provides flexibility from the polyurethane polymer while achieving resistance to organic solvents and high temperature stability through the specific segment composition and low glass transition temperature.
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 articles exhibit enhanced durability, resistance to organic solvents, and low friction, maintaining performance across a broad temperature range while avoiding visible defects, thus addressing the limitations of existing technologies.
Implementation Method 1
the specific chemical identities and relative amounts of the segments and moieties of the aliphatic polyurethane polymer are sufficient to impart a glass transition temperature of 10°C or less in the article and a storage modulus in the article that changes less than 15 MPa from 25°C to 175°C
Data Source
AI summary
There is provided an article a binder resin layer comprising an aliphatic polyurethane polymer comprising a plurality of soft segments, and a plurality of hard segments, where the soft segments comprise poly(alkoxy) polyol, and where the poly(alkoxy) polyol is essentially free of crosslmker; and a plurality of microspheres partially embedded and adhered to a first major surface of the binder resin layer, wherein the specific chemical identities and relative amounts of the segments and moieties of the aliphatic polyurethane polymer are sufficient to impart a glass transition temperature of 10°C or less in the article and a storage modulus in the article that changes less than 15 MPa from 25°C to 175°C.