Method for creation of biomimetic surfaces
First Claim
1. A method of creating a biomimetic negatively charged, hydrated layer on the surface of an article formed primarily from polymers selected from acrylic polymers, methacrylic polymers, and copolymers or mixtures thereof, which polymers are hydrogel polymers which are capable of being swelled in water, which comprises:
- (a) contacting said article at a temperature between 20°
C. and 125°
C., with tetraalkylammonium hydroxide solution of a solvent which is immiscible with water, said solution having at least one tetraalkylammonium hydroxide having a general formula;
space="preserve" listing-type="equation">R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+ OH.sup.-where R1, R2, R3, R4 are alkyl substituents, in which the sum of the number of carbon atoms is equal to or larger than 8 but less than 45, and;
(b) removing the article from said tetraalkylammonium hydroxide solution and removing the excess of the said solution by washing in an aqueous washing solution of an acid with a pK value of less than 4.5, said aqueous washing solution being miscible with said tetraalkylammonium hydroxide.
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Accused Products
Abstract
In the present invention method, the surface of articles made of acrylic polymers and methacrylic polymers are converted into thin biomimetic layers by using the process involving at least the following two steps:
(a) The polymer surface is contacted, in the presence of water and for a predetermined reaction time necessary to form a continuous surface layer thinner than about 500 microns, with a solution containing one or more tetraalkylammonium hydroxides of the general formula:
R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+ OH.sup.-
where R1, R2, R3, R4 are the alkyl substituents, in which the sum of the number of carbon atoms is equal to or larger than 8 but smaller than 45; and,
(b) The article is removed from the aqueous reaction solution and excess of tetraalkylammonium hydroxide is removed from the polymer surface by washing the polymer with a liquid miscible with the tetraalkylammonium hydroxide.
49 Citations
20 Claims
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1. A method of creating a biomimetic negatively charged, hydrated layer on the surface of an article formed primarily from polymers selected from acrylic polymers, methacrylic polymers, and copolymers or mixtures thereof, which polymers are hydrogel polymers which are capable of being swelled in water, which comprises:
-
(a) contacting said article at a temperature between 20°
C. and 125°
C., with tetraalkylammonium hydroxide solution of a solvent which is immiscible with water, said solution having at least one tetraalkylammonium hydroxide having a general formula;
space="preserve" listing-type="equation">R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+ OH.sup.-where R1, R2, R3, R4 are alkyl substituents, in which the sum of the number of carbon atoms is equal to or larger than 8 but less than 45, and; (b) removing the article from said tetraalkylammonium hydroxide solution and removing the excess of the said solution by washing in an aqueous washing solution of an acid with a pK value of less than 4.5, said aqueous washing solution being miscible with said tetraalkylammonium hydroxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of creating a biomimetic negatively charged, hydrated layer on the surface of an article formed primarily from polymers selected from acrylic polymers, methacrylic polymers, and copolymers or mixtures thereof, which polymers are hydrogel polymers which are capable of being swelled in water, which comprises:
-
(a) contacting said article at a temperature between 20°
C. and 125°
C., with tetraalkylammonium hydroxide aqueous solution, said solution having at least one tetraalkylammonium hydroxide having a general formula;
space="preserve" listing-type="equation">R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+ OH.sup.-where R1, R2, R3, R4 are alkyl substituents, in which the sum of the number of carbon atoms is equal to or larger than 8 but less than 45, and; (b) removing the article from said tetraalkylammonium hydroxide solution and removing the excess of the said solution by washing in a washing liquid miscible with said tetraalkylammonium hydroxide. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification