Compatibility
The compatibility of Butvar polyvinyl butyral resins (PVB) with various plasticizers, modifiers, and additional resins is extensively documented. Butvar is readily amenable to compounding with other additives to improve its physical and chemical characteristics. Plasticizers are frequently utilized to enhance flexibility across a wider temperature spectrum, as noted in Table 9.
Crosslinking agents, including Santolink phenolic and Resimene amino resins, are employed to provide superior toughness and thermal stability. The compatibility of Butvar polyvinyl butyral resins (Butvar B-98 & PVB WWW-A-20) with other modifiers and resins is illustrated in Table 10.
Insolubilizing Reactions
Numerous applications of vinyl acetal resins involve curing processes that utilize thermosetting resins to achieve the desired property balance. The free hydroxyl groups present in vinyl acetal resins serve as reactive sites for chemical interaction, allowing for the insolubilization of the resins. Generally, any chemical reagent or resinous material capable of reacting with secondary alcohols will interact with polyvinyl butyral (Butvar B-76 & WWW-A-30) to reduce its solubility. The characteristics of coatings can vary significantly depending on the type and quantity of crosslinking agents employed.
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