Patent ID: 8530531
Filing Date: 2013-09-10
Classification: C08J,Y02P,Y02W,Y10T

Abstract:
1. A method for recycling of polyvinyl butyral (PVB), comprising: providing a solid state PVB which was obtained from laminated glass and cut into pieces, wherein the solid state PVB has glass chemically adhered to the PVB; subjecting the solid state PVB to a first polyvinyl butyral purification stage comprising chemical treatment with an acid to obtain a purified solid state PVB; and then subjecting the purified solid state PVB to a final chemical treatment stage comprising chemical treatment with a base to obtain a treated purified solid state PVB; wherein the treated purified solid state PVB is substantially free of the glass, is recycled and is suitable for manufacture of laminated glass.