Non yellowing, thermally stable polyvinyl alcohol

Details Non yellowing, thermally stable polyvinyl alcohol Non yellowing, thermally stable polyvinyl alcohol

1998-01-29

2000-04-04

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525 61, 525 62, C08F 1606, C08F11606, C08F21606, C08G 6348, C08G 6391

Patent

active

060462728

ABSTRACT:
A process for making a thermally stable and substantially low yellow polyvinyl alcohol, and a process for reversing discoloration of polyvinyl alcohol. The process consists of treating polyvinyl acetate before saponification or treating polyvinyl alcohol after saponification with a small amount of a reducing phosphorus-containing compound and, optionally, a trace amount of a peroxide. This invention is particularly useful in producing low molecular weight polyvinyl alcohol which is thermally stable and low in yellow color.

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The Measurement of Appearance. 2d ed. edited by Richard S. Hunter and Richard W. Harold. Wiley, (1987) pp. 211 & 214.

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