Aqueous process for recycling acetal polymer and moldings thereo

Details Aqueous process for recycling acetal polymer and moldings thereo Aqueous process for recycling acetal polymer and moldings thereo

1992-06-03

1994-07-05

Stoll, Robert L.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

549368, C08G 200

Patent

active

H00013390

ABSTRACT:
This invention relates to an aqueous process for recycling polyacetal, and moldings thereof, into formaldehyde monomer solution, said process occurring at elevated temperature and pressure and in the presence of an acid decomposition catalyst, such as sulfuric acid. The resultant formaldehyde monomer solution can be reacted to form trioxane and then be cycled into a trioxane-based polyacetal manufacturing process or, alternatively, it can be further treated and then be cycled into a formaldehyde-monomer-based polyacetal manufacturing process.

REFERENCES:
patent: 3000960 (1961-09-01), Wheeler et al.
patent: 3409675 (1968-11-01), Atwood et al.
patent: 3494958 (1970-02-01), Mannsfeld et al.
patent: 3597396 (1971-08-01), Ackermann et al.
patent: 4088818 (1978-05-01), Radici et al.
patent: 4740637 (1988-04-01), DelMar et al.
patent: 5043121 (1991-08-01), Wingefeld et al.

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