Surface additive based on polysiloxane modified unsaturated polyester
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Solution Overview
Problem
Existing polyester-modified polysiloxanes face limitations in synthesis variety, leading to restricted polarity and system compatibility, often resulting in solid products that require significant solvent use, and lack functional pendant groups for improved surface properties and thermal stability.
Innovation Solution
A polymer backbone comprising a polyester segment with ethylenically unsaturated groups and polysiloxane segments, linked via hydrosilylation, allowing for a broad range of functional pendant groups and thermal stability, available in liquid or solid form, enhancing surface properties like slip, scratch resistance, and easy-to-clean characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ring-opening polymerization of lactones is used to synthesize polyester-modified polysiloxanes, then the synthesis is straightforward, but the product variety is limited and significant quantities of solvents are needed
Solution Approach 1:
The patent changes the synthesis approach from ring-opening polymerization to polycondensation of di-carboxylic acid with diols, fundamentally altering the reaction parameters to achieve diverse functional groups and adjustable polarity without requiring large solvent quantities
Solution Approach 2:
The invention creates composite polyester-polysiloxane structures with multiple functional groups (hydroxyl, carboxyl, ester, acrylate, methacrylate) combined in a single polymer backbone, enabling varied surface properties and system compatibility while maintaining liquid form
2Reliability
If polyester-modified polysiloxanes are used to enhance surface properties, then scratch resistance and slip are improved, but the synthesis does not proceed as described and polysiloxane chains decompose
Solution Approach 1:
The patent uses readily available di-carboxylic acid and diol building blocks that can be easily combined through polycondensation to create stable polyester-polysiloxane structures, avoiding the need for complex synthesis procedures and high-temperature distillations that cause decomposition
Solution Approach 2:
The invention changes the synthesis conditions by using polycondensation at moderate temperatures with standard catalysts, avoiding the high-temperature distillation processes (200°C) that cause polysiloxane chain decomposition and formation of cyclic oligomers
3Ease of manufacture
If ring-opening polymerization of lactones is used, then the synthesis is simple, but solid products are obtained requiring significant solvent dilution
Solution Approach 1:
The patent changes the polymerization parameters by using polycondensation of di-carboxylic acid with diols, which produces liquid products directly without requiring extensive solvent dilution, thereby reducing the quantity of substance needed and simplifying the final formulation
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 polymer achieves improved surface properties, including enhanced slip and scratch resistance, with low migration and thermal stability, suitable for various application systems, including coatings and thermoplastics.
Implementation Method 1
A polymer backbone comprising a polyester segment with ethylenically unsaturated groups and polysiloxane segments, linked via hydrosilylation
Data Source
AI summary
A polymer comprising a polymer backbone comprising a polyester segment S1, which comprises at least one unit according to formula (I) wherein R1 is an aromatic or aliphatic, saturated or unsaturated group consisting of elements selected from C, H, O, R2 is an aromatic or aliphatic, saturated or unsaturated group consisting of elements selected from C, H, O, X comprises at least one of OH, (C═O)OH, O—(C═O)CH3, O—(C═O)C(CH3)═CH2 and O—(C═O)CH═CH2, wherein the polyester segment S1 comprises at least one ethylenically unsaturated group, which is different from X and at least one polysiloxane segment S2.