US 2010/0305290 A1 · Continuous Washing of Poly(vinyl butyral)

Abstract

The present invention provides a method for continuously washing poly(vinyl butyral) in which a poly(vinyl butyral) slurry is passed through multiple continuous stirred tank reactors, each of which is adjusted to specific processing parameters that allow for continuous input, washing, and removal of poly(vinyl butyral). The resulting poly(vinyl butyral) can then be dried to form a powder resin that can be used in place of conventional poly(vinyl butyral) resin. In an alternative embodiment, a counter current screw washing unit is provided that passes wash water over the poly(vinyl butyral) in a direction opposite to the flow of the poly(vinyl butyral), thereby allowing the continuous washing of the poly(vinyl butyral) resin.

Claims22

Dependent claims

A method of continuously washing a poly(vinyl butyral) resin, comprising the steps:

providing a first continuous stirred tank reactor;
providing a second continuous stirred tank reactor;
adding a continuous stream of poly(vinyl butyral) slurry to said first continuous stirred tank reactor;
washing said continuous stream of poly(vinyl butyral) slurry in said first continuous stirred tank reactor to form a once washed poly(vinyl butyral) slurry;
moving said once washed poly(vinyl butyral) slurry to said second continuous stirred tank reactor;
washing said once washed poly(vinyl butyral) slurry in said second continuous stirred tank reactor to form a twice washed poly(vinyl butyral) slurry;
and,
removing said twice washed poly(vinyl butyral) slurry from said second continuous stirred tank reactor.

5 more elements

Dependencies are inferred from the claim text.

Continuous Washing of Poly(vinyl butyral)

Life of this patent

Continuous Washing of Poly(vinyl butyral)

Life of this patent

Abstract

Claims22