Process for the preparation of acetal polymers

Details Process for the preparation of acetal polymers Process for the preparation of acetal polymers

2006-04-04

2006-04-04

Teskin, Fred (Department: 1713)

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

Synthetic resins

From aldehyde or derivative thereof as reactant

C528S249000, C528S408000, C526S193000

Reexamination Certificate

active

07022805

ABSTRACT:
The present invention relates to a process for the preparation of acetal polymers, in particular of polyoxymethylene (POM) by cationic polymerization where organophosphonic and/or organophosphinic acids and/or their derivatives and/or their precursors are used as the initiator.

REFERENCES:
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patent: 3454683 (1969-07-01), Kampe et al.
patent: 5013805 (1991-05-01), Wang
patent: 5994455 (1999-11-01), Muck et al.
patent: 0 678 535 (1995-10-01), None
Kim et al, “Phosphonic acid esters as thermally latent initiators: Initiaton process in the polymerization of glycidyl phenyl ether” Macromol. Chem. Phys., 2000, 201, 1691-1695.
Kamigaito et al, “Living Cationic Polymerization of Vinyl Ethers . . . Phosphoric and Phosphinic Acids/Zinc Chloride Initiating Systems for Isobutyl Vinyl Ether”, Journal of Polymer Science: Pt. A: Polymer Chemistry, vol. 31, 2987-2994 (1993).

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