Polyoxyalkylene-polysiloxane Copolymer Additives for Recoatable Coatings
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Solution Overview
Problem
Commercially available polyoxyalkylene-polysiloxane copolymers used in paint and varnishes lack the ability to be painted over or printed on without wetting errors, limiting their application in touch-ups and repairs, and do not offer optimal scratch resistance and sliding properties simultaneously.
Innovation Solution
Development of universal slip and leveling additives with specific polyoxyalkylene-polysiloxane copolymers of a general formula, featuring a chain length of n ≥ 45, average molecular weight > 3000 g/mol, and a molecular weight ratio of oxyethylene to oxypropylene units <0.8, allowing for improved scratch resistance and sliding ability while enabling paintability and printability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyoxyalkylene-polysiloxane copolymers are used as slip and flow additives, then scratch resistance and sliding properties are improved, but the ability to be painted over or printed on without wetting errors is lost
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of the polyoxyalkylene block (>3000 g/mol) and the chain length of the copolymer (n ≥ 45), along with the molecular weight ratio of oxyethylene to oxypropylene units. These specific parameter ranges enable the additive to maintain scratch resistance while achieving overcoatability and overprintability without wetting errors, resolving the contradiction between durability and versatility.
2Ease of operation
If polyoxyalkylene-polysiloxane copolymers with specific molecular weight are used, then flow and gliding effect are enhanced, but the complexity of formulation increases
Solution Approach 1:
The patent simplifies formulation complexity by establishing specific parameter ranges for the copolymer structure, including molecular weight of the polyoxyalkylene block (>3000 g/mol) and chain length (n ≥ 45). Within these defined parameters, the additives deliver enhanced flow and gliding effects without requiring complex formulation adjustments, making the solution both effective and manageable.
3Ease of operation
If commercially available slip and flow additives are used, then slip resistance is improved, but recoatable quality and uniformity are compromised
Solution Approach 1:
The patent resolves the contradiction by changing the molecular weight parameter of the polyoxyalkylene block to >3000 g/mol and specifying the chain length n ≥ 45. These parameter adjustments enable the additive to provide both slip resistance and excellent recoatable quality with uniform appearance, eliminating the trade-off present in commercially available products.
Data Source
Figure 1
AI summary
The invention relates to universal slip and flow control additives with recoatable/overprintable qualities, comprising polyoxyalkylene-polysiloxane copolymers of the general formula (I) R1 = identical and/or different alkyl radicals of 1 to 8 C atoms, preferably 1-4 C atoms, more preferably 1 or 2 C atoms, R = R1 and/or –CpH2pO[(C2H4O)x(C3H6O)y]R2, where p = 2, 3 or 4, with the proviso that at least one R = –CpH2pO[(C2H4O)x(C3H6O)y]-, R2 = alkyl radical of 1 to 3 C atoms, n ≥ 45, m = 1 to 5, where x and y are chosen such that the molar weight of the polyoxyalkylene block [C2H4O)x(C3H6O)y] is > 3000 g/mol and the molar weight ratio of x to y is < 0.8.