Polyether Polysiloxane Polymer Additive for Coatings
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Solution Overview
Problem
Current polymers used as additives in coatings struggle to achieve a balance between desired surface properties like slip, leveling, and dirt repellency while avoiding undesired properties such as insufficient over-coating and surface imperfections, often deteriorating mechanical properties, weathering resistance, and corrosion protection.
Innovation Solution
A polymer with a linear or branched backbone and covalently linked polyether and polysiloxane segments, where the polysiloxane segment has a specific molecular weight range, is used as an additive to control surface properties without compromising other properties, achieved through a process involving polymer analogous reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polymers with polyether-polysiloxane side chains are used to improve surface properties like slip and leveling, then desired surface properties are enhanced, but undesired properties like insufficient over-coating and surface imperfections occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of the polysiloxane segment (1050-6000) and the ratio of polyether to polysiloxane units (1:4 to 4:1). These parameter optimizations resolve the contradiction by tuning the polymer structure to achieve both desired surface properties and avoid undesired over-coating issues
Solution Approach 2:
The patent uses composite materials by creating a hybrid polymer structure combining polyether and polysiloxane segments in a specific architecture. The side chains contain both polyether units (providing slip and leveling) and polysiloxane units (providing over-coating properties), with the composite structure achieving a balance between contradictory surface properties
2Ease of operation
If additives are added to control surface properties, then surface performance is improved, but mechanical properties, weathering resistance, and corrosion protection deteriorate
Solution Approach 1:
The patent applies universality by designing a multi-functional polymer that simultaneously provides surface property control and maintains mechanical integrity. The polymer backbone provides structural strength while the side chains provide surface activity, allowing one additive to perform multiple functions without compromising mechanical properties
Solution Approach 2:
The patent uses parameter changes by optimizing the molecular weight of the entire polymer (2000-200,000) and the specific ratios of different segments. These parameter adjustments ensure that the additive concentration required for surface property control is low enough to preserve mechanical properties, weathering resistance, and corrosion protection
3Ease of operation
If larger amounts of polymer additive are used to enhance surface properties, then surface performance improves, but the balance between desired and undesired properties deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight range (2000-200,000) and segment composition ratios. These parameter optimizations enable effective surface property control at low additive concentrations, preventing the deterioration of property balance that would occur with higher concentrations
Data Source
AI summary
The invention relates to a polymer having a) a polymer backbone and b) one or more polymeric side chains covalently linked to the polymer backbone, wherein the polymeric side chains comprise a polyether segment and a polysiloxane segment, said polysiloxane segment having a number average molecular weight in the range of 1050 to 6000, and said polyether segment being positioned between the polymer backbone and the polysiloxane segment.