Ester-forming monomer

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters

Reexamination Certificate

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Details

C521S040000, C521S048000, C521S048500, C528S481000, C528S492000, C528S496000, C528S503000, C560S096000, C562S480000

Reexamination Certificate

active

06867322

ABSTRACT:
An ester-forming monomer obtained by depolymerization of polytrimethylene terephthalate and having an acrolein content of no greater than 0.5 wt %. Polymers obtained using the monomer and fibers, films and molded articles comprising the polymers. The ester-forming monomer is obtained by reacting polytrimethylene terephthalate with at least one compound selected from among monoalcohols, 1,3-propanediol and water in the presence of a basic substance. When the recovered ester-forming monomer is used as the starting material for production of a polymer, it is possible to produce a molding polymer for fibers, films and the like with quality equivalent to or higher than that obtained using virgin monomer.

REFERENCES:
patent: 2884443 (1959-04-01), Siggel et al.
patent: 3488298 (1970-01-01), Barkery et al.
patent: 3776945 (1973-12-01), Ligorati et al.
patent: 5532404 (1996-07-01), Gallagher
patent: 0484963 (1991-11-01), None
patent: 2041916 (1980-09-01), None
patent: 50-82028 (1975-07-01), None
patent: 53-63338 (1978-06-01), None
patent: 06072922 (1994-03-01), None
patent: 06157402 (1994-06-01), None
patent: 09020703 (1997-01-01), None
patent: WO 9418152 (1994-08-01), None
patent: WO 9749652 (1997-12-01), None

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