US 9,809,006 B2
Polymer interlayers having improved sound insulation properties
Jun Lu, East Longmeadow, MA (US); and Wenjie Chen, Amherst, MA (US)
Assigned to Solutia Inc., St. Louis, MO (US)
Filed by Solutia Inc., St. Louis, MO (US)
Filed on Dec. 8, 2014, as Appl. No. 14/563,719.
Prior Publication US 2016/0159039 A1, Jun. 9, 2016
Int. Cl. B32B 27/22 (2006.01); B32B 27/08 (2006.01); B32B 17/06 (2006.01); B32B 17/10 (2006.01); B32B 27/30 (2006.01); B32B 27/36 (2006.01)
CPC B32B 17/064 (2013.01) [B32B 17/10605 (2013.01); B32B 17/10761 (2013.01); B32B 27/08 (2013.01); B32B 27/22 (2013.01); B32B 27/306 (2013.01); B32B 27/36 (2013.01); B32B 2250/03 (2013.01); B32B 2270/00 (2013.01); B32B 2307/102 (2013.01); B32B 2307/412 (2013.01); B32B 2307/418 (2013.01); B32B 2307/558 (2013.01); B32B 2307/732 (2013.01); B32B 2419/00 (2013.01); B32B 2457/12 (2013.01); B32B 2551/00 (2013.01); B32B 2571/02 (2013.01); B32B 2605/006 (2013.01); B32B 2607/02 (2013.01)] 20 Claims
 
1. A polymer interlayer comprising:
a layer comprising a poly(vinyl acetal) resin having a residual hydroxyl content and a residual acetate content, and
a plasticizer,
wherein the residual hydroxyl content, the residual acetate content and the plasticizer are selected such that the polymer interlayer has at least one glass transition temperature less than about 20° C. and a peak tan delta of greater than 1.33,
and a glass panel having a configuration of 2.3-mm glass//interlayer//2.3-mm glass and at 20° C. has a transmission loss, TLw, of greater than 42 decibels as measured by weighted average sound transmission loss at 2000 to 8000 Hz, and a transmission loss, TLc, of greater than 38 decibels at the coincident frequency.