Abstract

AbstractVinyl acetal polymers are terpolymers, with units of vinyl acetate, vinyl alcohol, and vinyl acetal reflecting the three reactions required for their manufacture. Manufacture involves several stages including vinyl acetate polymerization and either sequential or concurrent hydrolysis of poly(vinyl acetate) to poly(vinyl alcohol) and acetalization with an aldehyde in the presence of an acid catalyst. Only poly(vinyl butyral) and to a lesser extent poly(vinyl formal) continue to be made in sizeable commercial quantities. These polymers form hard, unpliable materials that are difficult to process without using solvents or plasticizers. Plasticized poly(vinyl butyral) interlayer for laminated safety glass is by far the largest single application for this class of polymers. Poly(vinyl butyral) provides flexible toughness over a wide range of temperatures and at a lower cost than vinyl acetal polymers derived from longer chain aldehydes. Where stiffer performance at higher temperatures is required, poly(vinyl formal) provides significant property advancement. Applications for vinyl acetal resins make use of their optical clarity, high pigment and filler binding capacity, and excellent adhesion to a variety of surfaces.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.