Abstract 1. A HYDROSCOPIC POLYMERIZED AND IRRADIATED COMPOSITION ADAPTED TO BE SWOLLEN BY WATER TO MAKE A SOFT CONTACT LENS CONSISTING ESSENTIALLY OF 20-45% OF A HIGH MOLECULAR WEIGHT SOLID POLYVINYL PYRROLIDONE ONTO WHICH IS GRAFT POLYMERIZED 80-55% OF MONOMETHACRYLATE ESTER OF A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOL, DIETHYLENE GLYCOL AND DIPROPYLENE GLYCOL, THERE BEING PRESENT LESS THAN 1% METHACRYLIC ACID AND LESS THAN 0.2% DIMETHACRYLATE AS IMPURITIES IN SAID ESTER WHICH IS INITIATED IN STATIC CONDITION AT 40-60* C. FOR 4-24 HOURS WITH LOW TEMPERATURE FREE-RADICAL INITIATOR SELECTED FROM THE GROUP CONSISTING OF DISECONDARY BUTYL PEROXY DICARBONATE, PYRROLIDONE ACETYL PEROXIDE AND CYCLOHEXANONE PEROXIDE IN A CONCENTRATION OF ABOUT 0.1% BY WEIGHT OF SAID ESTER AND POLYVINYLPYRROLIDONE AND FURTHER POLYMERIZED AT 90-120*C FOR 1/2 TO 2 HOURS WITH MEDIUM TEMPERATURE FREE-RADICAL INITIATOR SELECTED FROM THE GROUP CONSISTING OF BENXOYL PEROXIDE, DIETHYL PEROXIDE, AZOISOBUTYRONITRILE AND ORTHOTOLYL PEROXIDE IN A CONCENTRATION OF ABOUT 0.1% BY WEIGHT OF SAID ESTER AND POLYVINYL PYRROLIDONE, SAID COMPOSITION BEING SUBSTANTIALLY IRRADIATED UNDER HIGH ENERGY 250 WATT ULTRAVOILET RADIATION OF WAVELENGTH 2000-4000 ANGSTROMS FOR 1/2 TO 4 HOURS OF X-RAYS AT A DOSAGE 10**7 ROENTGENS FOR 15 MINUTES TO 1 HOUR OR UNDER GAMMA RAYS IN A DOSAGE OF 5 TO 95 MEGARADS FOR 5 MINUTES TO 1 HOUR. D R A W I N G
A HYDROSCOPIC POLYMERIZED AND IRRADIATED COMPOSITION ADAPTED TO BE SWOLLEN BY WATER TO MAKE A SOFT CONTACT LENS CONSISTING ESSENTIALLY OF 20-45% OF A HIGH MOLECULAR WEIGHT SOLID POLYVINYL PYRROLIDONE ONTO WHICH IS GRAFT POLYMERIZED 80-55% OF MONOMETHACRYLATE ESTER OF A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOL, DIETHYLENE GLYCOL AND DIPROPYLENE GLYCOL, THERE BEING PRESENT LESS THAN 1% METHACRYLIC ACID AND LESS THAN 0.2% DIMETHACRYLATE AS IMPURITIES IN SAID ESTER WHICH IS INITIATED IN STATIC CONDITION AT 40-60* C. FOR 4-24 HOURS WITH LOW TEMPERATURE FREE-RADICAL INITIATOR SELECTED FROM THE GROUP CONSISTING OF DISECONDARY BUTYL PEROXY DICARBONATE, PYRROLIDONE ACETYL PEROXIDE AND CYCLOHEXANONE PEROXIDE IN A CONCENTRATION OF ABOUT 0.1% BY WEIGHT OF SAID ESTER AND POLYVINYLPYRROLIDONE AND FURTHER POLYMERIZED AT 90-120*C FOR 1/2 TO 2 HOURS WITH MEDIUM TEMPERATURE FREE-RADICAL INITIATOR SELECTED FROM THE GROUP CONSISTING OF BENXOYL PEROXIDE, DIETHYL PEROXIDE, AZOISOBUTYRONITRILE AND ORTHOTOLYL PEROXIDE IN A CONCENTRATION OF ABOUT 0.1% BY WEIGHT OF SAID ESTER AND POLYVINYL PYRROLIDONE, SAID COMPOSITION BEING SUBSTANTIALLY IRRADIATED UNDER HIGH ENERGY 250 WATT ULTRAVOILET RADIATION OF WAVELENGTH 2000-4000 ANGSTROMS FOR 1/2 TO 4 HOURS OF X-RAYS AT A DOSAGE 10**7 ROENTGENS FOR 15 MINUTES TO 1 HOUR OR UNDER GAMMA RAYS IN A DOSAGE OF 5 TO 95 MEGARADS FOR 5 MINUTES TO 1 HOUR.
Claim 2
Dependent Claim
216 words
A HYDROSCOPIC POLYMERIZED AND IRRADIATED COMPOSITION ADAPTED TO BE SWOLLEN BY WATER TO MAKE A SOFT CONTACT LENS CONSISTING ESSENTIALLY OF 20-45% OF A HIGH MOLECULAR WEIGHT SOLID POLYVINYL PYRROLIDONE ONTO WHICH IS GRAFT POLYMERIZED 80-55% OF MONOMETHACRYLATE ESTER OF A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, PROPYLENE GLYCOL, DIETHYLENE GLYCOL AND DIPROPYLENE GLYCOL, THERE BEING PRESENT LESS THAN 1% METHACRYLIC ACID AND LESS THAN 0.2% DIMETHACRYLATE AS IMPURITIES IN SAID ESTER WHICH IS INITIATED IN STATIC CONDITION AT 40-60* C. FOR 4-24 HOURS WITH LOW TEMPERATURE FREE-RADICAL INITIATOR SELECTED FROM THE GROUP CONSISTING OF DISECONDARY BUTYL PEROXY DICARBONATE, PYRROLIDONE ACETYL PEROXIDE AND CYCLOHEXANONE PEROXIDE IN A CONCENTRATION OF ABOUT 0.1% BY WEIGHT OF SAID ESTER AND POLYVINYLPYRROLIDONE AND FURTHER POLYMERIZED AT 90-120*C FOR 1/2 TO 2 HOURS WITH MEDIUM TEMPERATURE FREE-RADICAL INITIATOR SELECTED FROM THE GROUP CONSISTING OF BENXOYL PEROXIDE, DIETHYL PEROXIDE, AZOISOBUTYRONITRILE AND ORTHOTOLYL PEROXIDE IN A CONCENTRATION OF ABOUT 0.1% BY WEIGHT OF SAID ESTER AND POLYVINYL PYRROLIDONE, SAID COMPOSITION BEING SUBSTANTIALLY IRRADIATED UNDER HIGH ENERGY 250 WATT ULTRAVOILET RADIATION OF WAVELENGTH 2000-4000 ANGSTROMS FOR 1/2 TO 4 HOURS OF X-RAYS AT A DOSAGE 10**7 ROENTGENS FOR 15 MINUTES TO 1 HOUR OR UNDER GAMMA RAYS IN A DOSAGE OF 5 TO 95 MEGARADS FOR 5 MINUTES TO 1 HOUR.