HIGH TG MONOLITHIC POLY(VINYL ACETAL) SHEET

摘要

A polyvinyl acetal poly(vinyl acetal), such as polyvinyl butyral, resin formulation, a method of extruding poly(vinyl acetal) resins, and related materials and products that provide for monolithic poly(vinyl acetal) sheets and glass panes having high Tg of at least 50° C. and high modulus at acceptable rates as indicated by their high melt flow index. This is made possible by a reduction in the amount of plasticizer while using a low molecular weight resin not to exceed 160,000 to obtain a thermoplastic resin having a high melt flow index and high Tg. The articles made with these monolithic interlayer sheets can be used in applications that require good modulus at outdoor temperatures.

主权项

1. A monolithic interlayer composition comprising:
(A) poly(vinyl acetal) resin in an amount of at least 60 wt. % based on the weight of the composition; and (B) a plasticizer in an amount of at least 5 parts per one hundred parts of said poly(vinyl acetal) resin;wherein said interlayer composition has a Tg of at least 46° C. and a melt flow index (“MFI”) of at least 0.65 grams/10 minutes when measured at 190° C. at a load of 2.16 kilograms.