Cleaning and liquid contact with solids – Processes – Gas or vapor condensation or absorption on work
Patent
1995-02-22
1997-03-04
Snay, Jeffrey
Cleaning and liquid contact with solids
Processes
Gas or vapor condensation or absorption on work
134 37, 134 42, 264 26, 264 85, B29C 7100, B29D 1100
Patent
active
056075189
ABSTRACT:
Methods of deblocking a polymeric article from a mold and/or removing undesirable materials from a polymeric article by applying supercritical fluids to the polymeric article. A preferred process is the treatment of ophthalmic lenses, such as contact lenses. Supercritical fluid, composed primarily of carbon dioxide, is applied to a contact lens affixed to a mold subsequent to the polymerization step. The application of supercritical fluid (SCF) causes the lens to efficiently and consistently separate from the mold, removes undesirable materials such as unreacted monomer, oligomers, or residual solvents from the lens core, and/or cleans the lens surface of adhered debris.
REFERENCES:
patent: 3806619 (1974-04-01), Zosel
patent: 4873218 (1988-05-01), Pekala
patent: 4882107 (1989-11-01), Cavender et al.
patent: 5035847 (1991-07-01), Nishio et al.
patent: 5306350 (1994-04-01), Hoy et al.
patent: 5339844 (1994-08-01), Stanford, Jr. et al.
patent: 5456759 (1995-10-01), Stanford, Jr. et al.
Carbon Dioxides Expanding Role, Chem Engr. 1993 Robt Steiner pp. 114-119.
Rate & Extent of Supercritical Fluid Extraction of Additives from Polypropylene: Diffusion Solubility Matrix Effects N J Cotton, et al, Journal of Appplied Polymer Science, vol. 48-1607-1619 (1993).
Pressure Products Industries, Inc., Bulletin PDU-700.
EnvironPro Technologies (Autoclave Engineering) Product Literature, "Two-Step Process, Non-aqueous Cleaning System From Autoclave Engineers".
EnvironPro Technologies (Autoclave Engineering) Product Literature, "The Natural Solution to Economical Precision Parts Cleaning and Drying".
Pressure Products Industries, Inc., Bulletin PDU-700.
Chem. Engr., Internat. Ed., vol. 100, No. 3, pp. 114-119.
J. Appl. Polym. Sci., 48, No. 9, pp. 1607-1609 (Jun. 5, 1993).
Hoffman Roger J.
Terry, Jr. Wilson L.
Ciba Geigy Corporation
Lee Michael U.
McC. Roberts Edward
Meece R. Scott
Snay Jeffrey
LandOfFree
Methods of deblocking, extracting and cleaning polymeric article does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods of deblocking, extracting and cleaning polymeric article, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods of deblocking, extracting and cleaning polymeric article will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2143415