Oxazoline Compounds Extend Latex Paint Open Time

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Solution Overview

Problem

Existing latex paints lack effective open-time extenders that can enhance the working time without compromising other paint properties such as opacity and color stability.

Innovation Solution

An aqueous coating composition incorporating 0.1 to 10 wt% of specific oxazoline compounds, along with 15 to 40 wt% acrylic binder and 15 to 35 wt% opacifying minerals, is developed to increase the open time of latex paints while maintaining paint properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If conventional latex paint formulations are used, then the paint dries quickly, but the working time (open time) is insufficient for proper application and adjustment

Engineering Contradiction:

Improveopen timeVSAvoidworking time

Core Design Contradiction:

Duration of action of moving objectVSLoss of time

Solution Approach 1:

The patent introduces oxazoline compounds as intermediary substances that mediate between the latex paint and the drying process. These compounds delay the evaporation and coalescence of latex particles, extending the period during which the paint remains workable and can be adjusted, thereby resolving the contradiction between quick drying and sufficient working time

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the chemical composition parameters of the paint by incorporating oxazoline compounds at specific concentrations (0.1 to 10 wt%). This parameter change alters the drying kinetics and rheological properties of the paint, extending open time while maintaining other critical properties such as opacity and color stability

Inventive Principle:

Principle #35Parameter changes

2Duration of action of moving object

If open-time extending additives are added to latex paints, then the working time is extended, but other paint properties such as opacity and color stability may be compromised

Engineering Contradiction:

Improveopen timeVSAvoidpaint properties stability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent carefully controls the concentration parameter of oxazoline compounds within the range of 0.1 to 10 wt%, optimizing the balance between extending open time and maintaining paint property stability. This parameter optimization ensures that the additive achieves its time-extending function without compromising opacity, color stability, or other critical paint characteristics

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The oxazoline compounds function as temporary, consumable additives that perform their time-extending function during the application window and then are incorporated into the final paint film without leaving residual harmful effects. This approach allows for reliable paint properties to be maintained after the open time extension function is fulfilled

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentEP3126457B1Oxazoline compounds as open-time extenders for latex paints

Publication Date: 2018.04.25 ANGUS CHEM CO

AI summary

An aqueous coating composition containing a compound of formula (I) wherein R1 is a C2-C20 hydrocarbyl group; and R2 and R3 independently are C1-C10 alkyl or HO(CH2CH2O)xCH2-, wherein x represents an integer from 0-5.