Abstract

Microparticles and Nanoparticles crosslinked polymer derived from 2-(2' -hydroxy-5 '-methacryloxyethylphenyl)-2H-benzotriazole or a derivative thereof, are disclosed. Process of preparing the polymeric nanoparticles per se and incorporated in or on a substrate are also disclosed. Uses of the polymeric nanoparticles and of substrates incorporating same, particularly for UV absorbing films, are also disclosed.

IPC Classes  ?

• C08F 265/06 - Polymerisation of acrylate or methacrylate esters on to polymers thereof
• C08F 263/06 - Macromolecular compounds obtained by polymerising monomers on to polymers of esters of unsaturated alcohols with saturated acids as defined in group on to polymers of esters with polycarboxylic acids
• C08F 265/04 - Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group on to polymers of esters
• C08F 6/24 - Treatment of polymer suspensions
• C08L 87/00 - Compositions of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
• C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
• C08J 7/16 - Chemical modification with polymerisable compounds

Abstract

Disclosed methyl styrene farmin compounds, and crosslinked polymeric backbones comprising same. Further disclosed microsized and nanosized polymeric particles comprising polyisothiouronium methylstyrene (PITMS) and/or poly(methyl styrene farmin) or a derivative thereof, and uses thereof in, for example, reducing or preventing growth of microorganisms.

IPC Classes  ?

• C08F 12/08 - Styrene
• C07C 335/32 - Isothioureas having sulfur atoms of isothiourea groups bound to acyclic carbon atoms
• A61K 31/795 - Polymers containing sulfur
• A61P 31/04 - Antibacterial agents

Abstract

A three-phase current limiter (30) for an alternating current system includes an AC magnetic circuit having at least one AC coil (35Rl, 35Sl, 35Tl) for each phase of a 3- phase AC supply wound on a saturable ferromagnetic core and configured to subject respective AC coils for each phase to a common magnetic flux, and a DC magnetic circuit (34a, 34b) for biasing the AC magnetic circuit into saturation at normal conditions. In use the AC coils are connected in series with a load and during alternate half cycles of the AC supply at least one of the AC coils produces a magnetic field that opposes a magnetic field of the DC magnetic circuit. The AC coils (35R, 35S, 35T) for each phase are configured so that at least one of the AC coils exhibits unbalanced magnetic impedance relative to remaining ones of the AC coils for each phase.

IPC Classes  ?

• H01F 29/14 - Variable transformers or inductances not covered by group with variable magnetic bias
• H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
• H01F 3/10 - Composite arrangements of magnetic circuits
• H01F 38/02 - Adaptations of transformers or inductances for specific applications or functions for non-linear operation
• G05F 3/06 - Regulating voltage or current wherein the variable is AC using combinations of saturated and unsaturated inductive devices, e g. combined with resonant circuit

Abstract

A current limiting device (30, 40, 50, 60) comprising for each phase of an AC supply a closed magnetic core (31) of reduced volume and mass having first and second pairs of opposing limbs (32a, 32b; 33a, 33b), and at least one AC coil (35a, 35b) enclosing opposing limbs (33a, 33b) of the magnetic core (31) and adapted for series connection with a load. A non-superconducting DC bias coil (34) typically formed of copper encloses a limb (32a, 32b) of the magnetic core (31) for saturating each of the opposing limbs (33a, 33b) in opposite directions by the bias coil (34). Under fault conditions, the AC flux in at least one limb counteracts the DC bias flux, bringing the limb out of saturation. Preferably, current is reduced in the DC bias coils thus bringing both opposing limbs of the core out of saturation.

IPC Classes  ?

• H01F 29/14 - Variable transformers or inductances not covered by group with variable magnetic bias
• H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current