Claims
- 1. A process for preparing a hydrophilic polymer film which comprises the steps of:
- coating the surface of a polymer film pre-treated with 60-110 KHz high frequency radiation with a photopolymerization solution containing 1 to 40% by weight of a hydrophilic monomer, a photo-initiating agent, a photo-enhancing agent, a cross-linking agent and 0.01 to 10% by weight of a UV stabilizer, wherein said hydrophilic monomer is selected from the group consisting of acrolein, acrylonitrile, acryloylchloride and a mixture thereof,
- said photo-enhancing agent is selected from the group consisting of n-butyl amine, diethyl amine, ethylmethacrylate, triethylene, tetramine, ethanol amine, ethyl amine, trimethyl amine and mixture thereof, and
- said UV stabilizer is selected from the group consisting of formula (I), (II) and a mixture thereof, ##STR2## wherein R.sup.1 is a hydrogen or t-butyl group, and R.sup.2 is methyl or t-butyl group, and
- photopolymerizing said photopolymerization solution and forming a hydrophilic polymer layer on the surface of said polymer film by a photo-reaction.
- 2. A process for preparing a hydrophilic polymer film by
- coating the surface of a polymer film with a photopolymerization solution consisting essentially of a hydrophilic monomer, a photo-initiating agent, a photo-enhancing agent selected from the group consisting of n-butyl amine, diethyl amine, ethylmethacrylate, triethylene, tetramine, ethanol amine, ethyl amine, trimethyl amine and a mixture thereof, a crosslinking agent and a UV stabilizer,
- drying said photopolymerization solution coated on the film, and
- photopolymerizing said photopolymerization solution to form a hydrophilic polymer layer on the surface of said polymer film by a photo-reaction carried out by irradiation to a UV light,
- the improvement which comprises the successive steps of:
- pre-treating the surface of the polymer film with 60-110 KHz of high frequency radiation before coating the photopolymerization solution;
- coating the pre-treated surface of the polymer film with the photopolymerization solution which contains 1 to 40% by weight of the hydrophilic monomer selected from the group consisting of acrolein, acrylonitrile, acryloylchloride and a mixture thereof and 0.01 to 10% by weight of the UV stabilizer selected from the group consisting of formula (II) and a mixture thereof ##STR3## wherein R.sup.1 is a hydrogen or t-butyl group, and R.sup.2 is methyl or t-butyl group;
- drying the coated photopolymerization solution by uniformly supplied air at a rate of 0.01 to 3 m/sec at a distance of 5 to 20 cm from a pair of air supply hoppers having a number of apertures with a diameter of 1 to 3 mm in a ratio of 1 aperture/cm.sup.2 ; and
- photopolymerizing by irradiating 30 to 160 W/cm of the UV light at a distance of 5 to 50 cm from the film surface.
Priority Claims (4)
Number |
Date |
Country |
Kind |
90-15402 |
Sep 1990 |
KRX |
|
90-15876 |
Sep 1990 |
KRX |
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90-15877 |
Sep 1990 |
KRX |
|
91-10041 |
Jun 1991 |
KRX |
|
Parent Case Info
This application is a continuation-in-part of application Ser. No. 07/909,720, filed on Jul. 7, 1992, abandoned, which is a Rule 60 divisional application of Ser. No. 07/766,340, filed Sep. 27, 1991, now U.S. Pat. No. 5,275,663, the entire contents of which are hereby incorporated by reference.
US Referenced Citations (5)
Foreign Referenced Citations (5)
Number |
Date |
Country |
52-40556 |
Mar 1977 |
JPX |
57-98578 |
Jun 1982 |
JPX |
57-147525 |
Sep 1982 |
JPX |
57-147526 |
Sep 1982 |
JPX |
60-137639 |
Jul 1985 |
JPX |
Non-Patent Literature Citations (4)
Entry |
Kirk-Othmer Encyclopedia of Chemical Technology, vol. 23, Third Edition, pp. 615-627, 1979. |
"Factors Affecting Photografting of Methacrylic Acid on Polyethylene Film in Liquid Phase System" by Y. Ogiwara et al, Journal of Applied Polymer Science, vol. 35, 1473-1481 (1988) no month given. |
"Surface Photografting, 2a) Modification of Polypropylene Film Surface by Graft Polymerization of Acrylamide b)" by S. Tazuke et al, Makromol. Chem., 179, 2603-2612 (1978) no month given. |
"Physico-chemical modifications of superficial regions of low-density polyethylene (LDPE) film under corona discharge" by B. Catoire et al, Polymer, 1984, vol. 25, Jun. |
Divisions (1)
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Number |
Date |
Country |
Parent |
766340 |
Sep 1991 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
909720 |
Jul 1992 |
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