Water soluble contact lens blocking composition

Details Water soluble contact lens blocking composition Water soluble contact lens blocking composition

2006-11-21

2006-11-21

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C264S001320, C264S001360, C351S162000, C524S275000

Reexamination Certificate

active

07138459

ABSTRACT:
A contact lens blocking composition with desirable melt properties can comprise a water soluble polymer such as a polyalkylpolyimine combined with a filler such as a highly soluble salt composition. The blocking composition can be readily removed from a shaped contact lens after machining and from the mandrel or other tool used in shaping the lens. The blocking composition is readily removed using an aqueous wash, aqueous washing solutions or ultrasonic cleaning procedures.

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