Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Reexamination Certificate
2006-11-14
2006-11-14
Boykin, Terressa (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
C521S046500, C521S048000, C526S344000, C526S344100
Reexamination Certificate
active
07135546
ABSTRACT:
Process for recycling an article based on at least one vinyl chloride or vinylidene chloride polymer, according to which:(a) the article is cut up into fragments with a mean size of 1 cm to 50 cm in the case where it would exceed these sizes;(b) the article fragments are brought into contact with an azeotropic or quasiazeotropic mixture of water and of a solvent capable of dissolving the polymer, at a temperature of at least 120° C.;(c) the polymer dissolved in the solvent is precipitated by a reduction in pressure and by injection of steam into the solution thus obtained, which additionally results in the entrainment of the solvent-water azeotrope and thus leaves a mixture remaining which is essentially composed of water and of solid polymer particles;(d) the polymer particles are collected.
REFERENCES:
patent: 3475218 (1969-10-01), Torrenzano et al.
patent: 3836486 (1974-09-01), Hafner
patent: 617 788 (1961-04-01), None
patent: 0 945 481 (1999-09-01), None
U.S. Appl. No. 10/497,995, filed Jun. 8, 2004, Vandenhende et al.
U.S. Appl. No. 10/088,085, filed Jun. 5, 2002, Vandenhende et al.
Vandenhende Bernard
Yernaux Jean-Marie
Boykin Terressa
Solvay ( Societe Anonyme)
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