Claims
- 1. A method of producing a hydrophylic membrane from a polyethylene base film by first irradiating the film of thickness not more than 150 .mu.m with ionizing radiation in air or an oxygen atmosphere to give a total dose of 2 to 30 Mrad at a dose rate of 5.times.10.sup.4 to 10.sup.7 rad/sec, and then grafting without additional radiation acrylic acid and/or methacrylic acid present in the form of a 10-60 wt% aqueous solution onto the irradiated film at a temperature of 10.degree. C. to 60.degree. C.
- 2. A method according to claim 1 wherein the aqueous solution of acrylic acid and/or methacrylic acid has the oxygen content thereof reduced to less than 0.1 ppm.
- 3. A method according to claim 1 wherein the degree of graft is at least 95%.
- 4. A method according to claim 1, wherein said temperature is no more than about 25.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-11983 |
Feb 1979 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 118,106 filed Feb. 4, 1980, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3115418 |
Magat et al. |
Dec 1963 |
|
3322661 |
Yoshikawa et al. |
May 1967 |
|
3427206 |
Scardaville et al. |
Feb 1969 |
|
3955014 |
Mostev et al. |
May 1976 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
118106 |
Feb 1980 |
|