Method for increasing the low temperature water solubility and t

Details Method for increasing the low temperature water solubility and t Method for increasing the low temperature water solubility and t

1983-10-03

1985-07-16

Michl, Paul R.

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

Synthetic resins

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

528496, 528503, 528491, 528499, 528502, C08F 1606, C08G 1800

Patent

active

045297754

ABSTRACT:
A method is provided for reducing the solvent content and increasing the sticking temperature of polyvinyl alcohol, which is prepared from the alcoholysis of polyvinyl acetate, charged to a dryer. The polyvinyl alcohol from the alcoholysis reaction, without prior vacuum drying at an elevated temperature, is slurried in a liquid medium comprising methanol, methyl acetate, water and, optionally, a nonsolvent for polyvinyl alcohol. The slurry is heated to at least 60.degree. C. for at least 5 minutes. The polyvinyl alcohol burnt particle count is reduced in the subsequent drying step and a product is afforded which has a reduced ash content and increased cold water solubility and low temperature solubility.

REFERENCES:
patent: 3156678 (1964-11-01), Dexheimer et al.
patent: 3278505 (1966-10-01), Kominami
patent: 3497487 (1970-02-01), Bristol
patent: 3654247 (1972-04-01), Bristol

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