Use of polymer alloys based on cellulose esters in contact...

Details Use of polymer alloys based on cellulose esters in contact... Use of polymer alloys based on cellulose esters in contact...

G - Physics

02

B

400/1332, 88/40

G02B 1/04 (2006.01) B29D 11/00 (2006.01) C08L 1/10 (2006.01) C08L 69/00 (2006.01)

Patent

CA 1218175

USE OF POLYMER ALLOYS BASED ON CELLULOSE ESTERS IN CONTACT OPHTHALMICS AND CONTACT LENSES PRODUCED FROM THE POLYMER ALLOYS Abstract of The Disclosure Contact lenses prepared from a polymer alloy essentially free from low molecular weight plasticizers and which comprises A) 97-80% by weight of one or more cellulose esters of one or more aliphatic carboxylic acids, and B) 3-30% by weight of an aliphatic polymeric compound having ester moieties, carbonate moieties or both ester and carbonate moieties in the polymer chain and having an average molecular weight of 2,000 to 300,000, with less than 2% by weight of compounds having a molecular weight below 500.

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