Ceskoslovenska Akademie Ved

Ceskoslovenska Akademie Ved of Prague

Czechoslovenska Akademie Ved of Praha

Pavel Cefelin

Jaroslav Kalal

Slavko Hudecek

Miroslav Stol

Milan Adam

Miroslav Tolar

Hana Hrudkova

Jaroslava Otoupalova

Iva Hudeckova

Ivana Hudeckova

Vaclav Janouch

A polymeric sulfoxide based on a polymer or copolymer of vinyl alcohol is disclosed, as well as a method of producing it. Sulfoxide containing polymers are useful as catalysts, as membranes and to hold metal cations. Hydrophilic and hydrophobic characteristics can be varied over wide ranges. The general formula for the polymeric sulfoxide of the invention is: ##STR1## where x and y are both greater than 0, z=0-0.8, and x+y+z=1.

Polymeric sulfoxide based on the polymer of vinylalcohol

This invention relates to terpolymers which are capable of forming hydrogels having very good compatibility with living tissues and may be used as substitutes for damaged tissues, as in the form of implants and various prostheses. The terpolymers are comprised of an oligourethane having an average molecular weight from 1200 to 3000, 2-hydroxyethyl(meth)acrylate or 2-hydroxypropyl(meth)acrylate, and N-vinylpyrrolidone.

Terpolymers having the character of hydrogels

Graft copolymers are formed having a backbone formed by monomeric units, selected from the group of vinyl monomers comprising acrylates, methacrylates, acrylamide, styrene and N-vinyl-2-phyrrolidone, and side branches formed by 10-80 wt. % of oligourethanes based on aliphatic, aromatic and alkylaromatic diisocyanates and low-molecular-weight diols with 2-4 carbon atoms in the molecule. The graft copolymers are prepared in two steps: the first step consists in the synthesis of oligourethane with the terminal unsaturated group; the second step is the radical copolymerization of this oligourethane with the above vinyl monomers.

Graft copolymers and the method of their preparation

The invention relates to a composite polymeric material suitable for biological and medical applications and to the method for preparation thereof. The composite material consists of 1-99 wt. % of hydrophilic polymer or copolymer based on methacrylic or acrylic esters, 1-99 wt. % of fibrillar collagen, and up to 2.5 wt. % of a crosslinking agent, based on both polymeric components. The composite material may further comprise biologically active compounds and other auxiliary materials, as fillers and/or plasticizers. The composite material is prepared by dispersing the fibrillar collagen in a solution or a highly swollen dispersion of the synthetic hydrophilic polymer or copolymer in a lytropic agent and the subsequent removal of the lyotropic agent, thus forming a matrix of the synthetic polymer or copolymer penetrated by fibrillar collagen or vice versa. The composite material may be applied on a solid support or reinforced with glass, plastics, cellulose, or metallic materials.

Composite polymeric material for biological and medical application and

The invention relates to a composite polymeric material suitable for biological and medical applications and to the method for preparation thereof. The composite material consists of 1-99 wt. % of hydrophilic polymer or copolymer based on methacrylic or acrylic esters, 1-99 wt. % of fibrillar collagen, and up to 2.5 wt. % of a crosslinking agent, based on both polymeric components. The composite material may further comprise biologically active compounds and other auxiliary materials, as fillers and/or plasticizers. The composite material is prepared by dispersing the fibrillar collagen in a solution or a highly swollen dispersion of the synthetic hydrophilic polymer or copolymer in a lyotropic agent and the subsequent removal of the lyotropic agent, thus forming a matrix of the synthetic polymer or copolymer penetrated by fibrillar collagen or vice versa. The composite material may be applied on a solid support or reinforced with glass, plastics, cellulose, or metallic materials. A method for the preparation of the composite material consists in dispersing of fibrillar collagen in a solution or a highly swollen dispersion of the synthetic hydrophilic polymer or copolymer in a lyotropic agent, e.g. in water diluted carboxylic acids, strongly acidified aqueous mixtures of ethanol and methanol, high-concentrated aqueous solutions of lyotropic salts, and high-concentrated aqueous solutions of urea or guanidinium chloride, at temperature not exceeding 37.degree. C., and the subsequent removing of the lyotropic agent from the viscous dispersion at temperature not exceeding 37.degree. C. using the known methods. The crosslinking agent, e.g. trimethylolurea, formaldehyde, acetaldehyde, glutaraldehyde, starch dialdehyde, glyoxal, or Cr(III) salts, may be added in the course of preparation of the dispersion or after removal of the lyotropic agent.

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Prague, Czechia

Pavel Cefelin