An example of a flow cell includes a substrate, which includes nano-depressions defined in a surface of the substrate, and interstitial regions separating the nano-depressions. A hydrophobic material layer has a surface that is at least substantially co-planar with the interstitial regions and is positioned to define a hydrophobic barrier around respective sub-sets of the nano-depressions.

A leuco polymer includes a leuco monomer and an alkene. The leuco polymer has a molecular weight of at least 500 and is obtainable by polymerization of the leuco monomer and one or more alkene co-monomers. The leuco monomer consists of an alkene covalently bound to a leuco moiety and the leuco monomer has a molar extinction coefficient at a wavelength in the range 400 to 750 nm of less than 1000 M.sup.1cm.sup.1. The alkene monomer(s) have a molar extinction coefficient at a wavelength in the range 400 to 750 nm that is less than 100 M.sup.1cm.sup.1. Methods of making the leuco polymer, laundry care compositions comprising the leuco polymer and methods of treating textiles with such laundry care compositions.

A leuco polymer includes a leuco monomer and an alkene. The leuco polymer has a molecular weight of at least 500 and is obtainable by polymerization of the leuco monomer and one or more alkene co-monomers. The leuco monomer consists of an alkene covalently bound to a leuco moiety and the leuco monomer has a molar extinction coefficient at a wavelength in the range 400 to 750 nm of less than 1000 M.sup.1cm.sup.1. The alkene monomer(s) have a molar extinction coefficient at a wavelength in the range 400 to 750 nm that is less than 100 M.sup.1cm.sup.1. Methods of making the leuco polymer, laundry care compositions comprising the leuco polymer and methods of treating textiles with such laundry care compositions.

An additive mixture comprising (I) a copolymer having a number average molecular weight of 800 g/mol to 50 000 g/mol and containing recurring units of the formula (la) and (Ila) or recurring units of the formula (la) and (IIb), wherein the recurring units (la) and (Ila) can have a random, alternating or block distribution and the molar ratio of (la) to (Ila) is 1:10 to 10:1, the recurring units (la) and (lIb) can have a random, alternating or block distribution and the molar ratio of (la) to (lIb) is 1:10 to 10:1, the radicals R.sub.1 independently of one another are C.sub.10-C.sub.30alkyl and the radicals R.sub.2 independently of one another are hydrogen or C.sub.1-C.sub.30acyl, (II) a metal salt, preferably a transition metal salt, and (III) an oxidizable substrate, with the proviso that components (I) and (III) are different.

##STR00001##

An additive mixture comprising (I) a copolymer having a number average molecular weight of 800 g/mol to 50 000 g/mol and containing recurring units of the formula (la) and (Ila) or recurring units of the formula (la) and (IIb), wherein the recurring units (la) and (Ila) can have a random, alternating or block distribution and the molar ratio of (la) to (Ila) is 1:10 to 10:1, the recurring units (la) and (lIb) can have a random, alternating or block distribution and the molar ratio of (la) to (lIb) is 1:10 to 10:1, the radicals R.sub.1 independently of one another are C.sub.10-C.sub.30alkyl and the radicals R.sub.2 independently of one another are hydrogen or C.sub.1-C.sub.30acyl, (II) a metal salt, preferably a transition metal salt, and (III) an oxidizable substrate, with the proviso that components (I) and (III) are different.

##STR00001##

The invention is related to a class of hydrophilic copolymers comprising loosely dangling thiol-containing pendant groups. The hydrophilic copolymers are highly reactive towards azetidinium groups of an azetidinium-containing polymer upon heating and can find particular use in for producing water-soluble highly-branched hydrophilic polymeric material useful for producing water gradient contact lenses.

The invention is related to a class of hydrophilic copolymers comprising loosely dangling thiol-containing pendant groups. The hydrophilic copolymers are highly reactive towards azetidinium groups of an azetidinium-containing polymer upon heating and can find particular use in for producing water-soluble highly-branched hydrophilic polymeric material useful for producing water gradient contact lenses.

A fiber can be made having a structure with an axial core and a coating layer. The fiber can have a polymer core and one or two layers surrounding the core. The fine fiber can be made from a polymer material and a resinous aldehyde composition such that the general structure of the fiber has a polymer core surrounded by at least a layer of the resinous aldehyde composition.

A fiber can be made having a structure with an axial core and a coating layer. The fiber can have a polymer core and one or two layers surrounding the core. The fine fiber can be made from a polymer material and a resinous aldehyde composition such that the general structure of the fiber has a polymer core surrounded by at least a layer of the resinous aldehyde composition.

A fiber can be made having a structure with an axial core and a coating layer. The fiber can have a polymer core and one or two layers surrounding the core. The fine fiber can be made from a polymer material and a resinous aldehyde composition such that the general structure of the fiber has a polymer core surrounded by at least a layer of the resinous aldehyde composition.