Stock material or miscellaneous articles – Composite
Patent
1990-06-04
1992-01-07
Cashion, Jr., Merrell C.
Stock material or miscellaneous articles
Composite
4284244, 428463, 428483, 428520, 427402, 4274071, B32B 904
Patent
active
050790935
DESCRIPTION:
BRIEF SUMMARY
TECHNOLOGICAL FIELD
The present invention relates to a medical material wherein a hydrophilic coating exhibiting excellent low frictional property, namely, easily-slippery property on wetting is formed on the surface of a base material and a method for preparation thereof.
BACKGROUND TECHNOLOGY
For medical materials including physiological and hygienic material etc., especially for catheters and guide wires, low frictional property (easily-slippery property) of the surface is one of the essential requirements. For example, if these materials have no easily-slippery property, when a catheter is inserted in a human body, there is the possibility that a pain could be accompanied with it or a damage or an inflammation of tissue mucosa could occur.
As conventional technologies providing the easily-slippery property, a method wherein the surface of a base material is coated with a variety of oils, a method wherein the surface of the base material is coated with a polymer having a low friction coefficient such as Teflon and a method wherein it is coated with a hydrophilic polymer are in public use. It is understood that especially, coating with a hydrophilic polymer is superior one from the viewpoints of practical use and safety.
As the practical methods for coating with a hydrophilic polymer, fixation of polyvinyl pyrrolidone with an isocyanate (Japanese Patent Laid-Open No.19,582/ 1984, U.S. Pat. No.4,100,309), a method using a hydrophilic polymer copolymerized with a reactive functional group and an isocyanate (Japanese Patent Laid-Open No.81,341/1984), fixation of polyethylene oxide with an isocyanate (Japanese Patent Laid-Open No.193,766/1983) are disclosed.
However, the method wherein the surface of a base material is coated with a variety of oils exhibits low durability and has a problem of safety due to eluates. The method wherein it is coated with a polymer having a low friction coefficient such as Teflon hardly exhibits sufficiently an easily-slippery property. The method of coating with a hydrophilic polymer exhibits an easily-slippery property being superior to these methods but there is a problem on its durability. For example, in fixation of polyvinylpyrrolidone with an isocyanate (Japanese Patent Laid-Open No.19,582/1984, U.S. Pat. No.4,100,309), the bonding between polyvinylpyrrolidone and the base material is not sufficient and an eluation occurs. Furthermore, in an improved method thereof wherein a hydrophilic polymer copolymerized with a reactive functional group and an isocyanate are used (Japanese Patent Laid-Open No.81,341/1984), these are not sufficiently solved. It is estimated that this is caused by a relatively easy hydrolysis of the bonding (amide bondings etc.). Moreover, in the fixation of polyethylene oxide with an isocyanate (Japanese Patent Laid-Open No.193,766/ 1983), there is similarly a problem on its durability.
As described above, there exists no method for providing an easily-slippery property exhibiting both characteristics, durability and safety. Namely, the purpose of the present invention is to offer a technology providing an excellent easily-slippery property which solves the problems of these conventional technologies.
DISCLOSURE OF THE INVENTION
The present invention is an easily-slippery medical material wherein the surface of a base material coated with the following component A is coated with the following component B selected from alkali metal alcoholate groups, amino group, alkali metal amide groups, carboxylic acid group, sulfonic acid group, magnesium halide groups and fluorinated boron complex groups. being reactive with reactive functional groups in the component A. and the method of preparation thereof.
The best embodiment for Practicing the Invention
The present invention provides a medical material having excellent easily-slippery property and durability which conventional technologies have never been able to provide obtained by fixing a hydrophilic polymer on the surface of a base material through a covalent bonding and a method for preparation ther
REFERENCES:
patent: 4100309 (1978-07-01), Micklus et al.
patent: 4729914 (1988-03-01), Kliment et al.
Akashi Ryojiro
Nagaoka Shoji
Cashion Jr. Merrell C.
Nakarani D. S.
Toray Industries Inc.
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