Copolyester composition

Details Copolyester composition Copolyester composition

1973-10-25

1976-05-25

Lieberman, Allan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75R, 260857PE, 260860, 128151, 128152, A61F 1100, C08K 554, C08L 6702, C08L 7700

Patent

active

039592006

ABSTRACT:
Disclosed herein is a linear, essentially non-crystalline copolyester composition comprising in polymerized form polymethylene glycol units of 2 to 6 carbon atoms, aliphatic dicarboxylic acid units of 5 to 10 carbon atoms, and isophthalic acid units, the isophthalic acid units comprising from about 10 to 50 mol percent of the total acid units, and the copolyester composition having an intrinsic viscosity in the range of about 0.3 to 0.8. The composition is useful in fabricating custom-molded earplugs by inserting into and sealing the auditory canal of the ear.

REFERENCES:
patent: 2475802 (1949-07-01), Osserman
patent: 2623033 (1952-12-01), Snyder
patent: 2623034 (1952-12-01), Flory et al.
patent: 2839492 (1958-06-01), Caldwell et al.
patent: 2910980 (1959-11-01), Stewart
patent: 3097059 (1963-07-01), Hoffman
patent: 3153005 (1964-10-01), Minter
patent: 3491048 (1970-01-01), Sargent
patent: 3624041 (1971-11-01), Brandrup et al.
patent: 3668277 (1972-06-01), Riemhofer et al.
patent: 3779993 (1973-12-01), Kibler et a.
Dow Corning Silicone Notebook, Reference No. 2003, Issued June 1952, pp. 2 & 4.

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