Biocatalytic Hydrophilization of Polyolefines
A new process for enhancing the hydrophilicity of the surface of a polyolefin or polyolefin copolymer article is characterized in that the surface is treated with an enzyme selected from oxidoreductases, especially of the cytochrome P450 family or enzymes classified as EC 1.13 or EC 1.14. The process is especially useful for the treatment of polypropylene films, fibres, or fabrics, inter alia for use in sanitary articles, threads, yarns, fabrics, textiles, garments, technical or household articles, printed or dyed cover films or packaging films.
1 . A process for enhancing the hydrophilicity of a surface of a polyolefin or polyolefin copolymer article, wherein said process comprises contacting said surface with an enzyme selected from the group consisting of oxidoreductases.
2 . The process according to claim 1 , wherein said oxidoreductases are obtained from the group consisting of natural bacterial whole cell preparations, modified stain bacterial whole cell preparations, fungal whole cell preparations, yeast whole cell preparations, plant whole cell preparations, mammalian whole cell preparations, cell lysates, extracts, and purified enzymes.
3 . The process of claim 1 , wherein the enzyme is selected from natural or modified monooxygenases.
4 . The Process according to claim 1 , wherein the treatment with enzyme is carried out in the presence of water at a pH between 3 and 12 and in the temperature range 30-100° C.
5 . The process according to claim 1 , wherein the enzyme is used in an amount from 0.001 g to 10 g enzyme protein per kg of polymer material to be treated, or in an amount from 10 −5 to 0.1 g of enzyme protein per square meter of surface to be treated.
6 . The process of claim 1 , wherein the surface material of the article comprises polyethylene or polypropylene or a copolymer comprising polyethylene and/or propylene repeating units.
7 . The process of claim 1 , wherein the surface material of the article comprises polypropylene or a copolymer comprising propylene repeating units.
8 . The process of claim 1 , wherein the article is a fibre, fabric, nonwoven, mono- or biaxially stretched film, or a moulded or extruded article.
9 . The process according to claim 1 , wherein the polyolefin or polyolefin copolymer contains one or more additives, fillers and/or finishing agents.
10 . The process according to claim 1 , wherein the surface is subjected to a washing step after the treatment with the enzyme.
11 . The process according to claim 1 , wherein the treated surface subsequently is subjected to one or more finishing steps by application of one or more suitable agents wherein said finishing steps are selected from the group consisting of dyeing, printing, imparting antimicrobial properties, imparting flame-retardant properties, and antistatic properties.
12 . A polyolefin or polyolefin copolymer article obtained by process according to claim 1 .
13 . The polyolefin or polyolefin copolymer article of claim 12 , which is characterized by a contact angle to water at least 10° smaller than the one of the untreated article.
14 . (canceled)
15 . The Polyolefin or polyolefin copolymer article according to claim 12 wherein said article is selected from the group consisting of sanitary articles, threads, yarns, fabrics, textiles, garments, technical or household articles, printed or dyed cover films and packaging films.
16 . The process according to claim 3 , wherein the enzyme is selected from the group consisting of cytochrome P450 family, enzymes classified as EC 1.13, enzymes classified as EC 1.14 and mixtures thereof.
17 . The process according to claim 4 , wherein the pH is between about 5 and about 9.
18 . The process according to claim 9 , wherein said additives, said fillers, and said finishing agents are selected from the group consisting of dyes, pigments, process stabilizers, ultraviolet light absorbers, hindered amine light stabilizers, further light stabilizers, antioxidants, processing aids, and surface modifiers.
19 . The process according to claim 10 , wherein said washing step is carried out with an aqueous solution of pH>8.