JOHN L PAYNE, P.T.
Physical Therapy in Saint Petersburg, FL
License number
Florida PT 28370
Category
Restorative Service Providers
Type
Physical Therapist
Address
Address
575 Ave Suncoast Fitness, Saint Petersburg, FL 33706
Phone
(727) 367-0075
(727) 367-0402 (Fax)
(727) 367-0402 (Fax)
Professional information
Lens Blocking Material Composition
US Patent:
5096969, Mar 17, 1992
Filed:
Nov 30, 1990
Appl. No.:
7/620468
Inventors:
John W. Payne - Treasure Island FL
Charles J. Duffy - Seminole FL
Charles J. Duffy - Seminole FL
Assignee:
Icare Industries Incorporated - St. Petersburgh FL
International Classification:
C08L 2308, C08L 3104
US Classification:
525222
Abstract:
A blocking material composition, an essentially homogeneous mixture of
(a) 80-90 weight percent of an ethylene derived hydrocarbon polymer having a molecular weight of 2600, a melting point of 51. degree. C. and a density of 0. 79 g/cc at 93. degree. C. ,
(b) 10-15 weight percent of a thermoplastic, low molecular weight aliphatic hydrocarbon resin derived from mixed monomers of petroleum origin having a softening point of 98. degree. -102. degree. C. , a specific gravity of 0. 948 at 25. degree. C. , an acid number <1, a molecular weight of 1985 and
(c) 1-3 weight percent of an ethylene/vinyl acetate copolymer having a vinyl acetate content of 18 percent by weight, a melt index of 150 g/10 min, a density of 937 g/cm. sup. 3 at 23. degree. C. and a softening point, ring and ball, of 99. degree. C. Also disclosed is a lens block of the blocking material and method for securing an ophthalmic lens to one surface of a lens block by applying to one surface of said lens block a molten blocking material composition.