Process for improving the stability of acetal polymers

Details Process for improving the stability of acetal polymers Process for improving the stability of acetal polymers

1979-10-25

1981-05-19

Phynes, Lucille M.

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

Synthetic resins

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

525398, 528230, C08G 600

Patent

active

042686431

ABSTRACT:
The terminal hydroxyl groups of an acetal polymer are esterified or etherified by reaction with an end-capping agent chosen from anhydrides of carboxylic acids, orthoesters and orthocarbonates, by forming an intimate mixture of polymer in powder form and liquid end-capping agent, the amount of said agent in the mixture being less than that which results in loss of the free-flowing characteristics of the powder, and reacting said mixture under stirring at 50.degree.-170.degree. C.

REFERENCES:
patent: 3125551 (1964-03-01), Punderson
patent: 3192182 (1965-06-01), Brown et al.
patent: 3347830 (1967-10-01), Nakajima
patent: 3998791 (1976-12-01), Radici et al.

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