Polyvinyl Acetate Adhesive Composition That Resists Saccharide Crystallization
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Solution Overview
Problem
Existing adhesive compositions comprising polyvinyl acetate face challenges in maintaining stability, especially under humid conditions, and require additional additives to prevent crystallization and separation of saccharides, which complicates storage and use.
Innovation Solution
Incorporating an aqueous saccharide composition with a specific ratio of fructose to glucose, ranging from 3:10 to 10:3, provides a biologically sourced extension that maintains homogeneity and stability, reducing viscosity and enhancing adhesion properties without crystallization, even under wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyvinyl acetate adhesive is extended with saccharide additives, then adhesive properties and biologically sourced content are improved, but crystallization and separation occur under storage conditions
Solution Approach 1:
The patent changes the compositional parameters by specifying a fructose to glucose weight ratio between 0.3 and 10, with fructose and glucose combined making up at least 50% of all saccharides. This specific parameter range prevents crystallization while maintaining high saccharide content (at least 70% total saccharides dry solids content), thereby resolving the contradiction between quantity of substance and stability.
2Ease of operation
If polyvinyl acetate adhesive is extended with high saccharide content, then viscosity is reduced and solids content is increased, but adhesion stability under humid conditions deteriorates
Solution Approach 1:
The patent achieves the desired handling characteristics by adjusting the fructose to glucose weight ratio to between 0.3 and 10, which optimizes viscosity and solids content while preventing adhesion instability. This parameter change allows the adhesive to maintain both ease of operation and reliability under humid conditions.
3Reliability
If auxiliary additives are added to control open time and prevent crystallization, then adhesive performance is improved, but formulation complexity increases
Solution Approach 1:
The patent extracts and eliminates the need for auxiliary additives by using a specific fructose to glucose weight ratio (0.3 to 10). This natural sugar blend inherently prevents crystallization and controls open time without requiring additional chemicals, thereby improving adhesive performance while reducing formulation complexity.
Solution Approach 2:
The fructose-glucose blend serves multiple functions simultaneously: it acts as a crystallization inhibitor, viscosity modifier, and open time controller. This self-service approach eliminates the need for separate auxiliary additives, reducing formulation complexity while maintaining reliable adhesive performance.
Data Source
AI summary
Aqueous adhesive compositions comprising polyvinyl acetate can be extended by a) providing an adhesive polymer component wherein at least about 75% of adhesive polymer materials present in the adhesive polymer component is polyvinyl acetate; b) providing an aqueous saccharide composition comprising fructose and glucose in a fructose to glucose weight ratio of from about 3:10 to about 10:3, wherein the fructose and glucose combined are at least about 50 percent of all saccharides present in the aqueous saccharide composition. The aqueous saccharide composition has a total saccharides dry solids content of at least 70 percent by weight based on the total aqueous saccharide composition. The adhesive polymer component is mixed with the aqueous saccharide composition to form an extended aqueous adhesive composition comprising from about 5 to about 50 percent by dry weight of the saccharide composition. Compositions and methods of use are also described.