Biodegradable, cross-linked polymer particle embolics and methods of making the same are described. The particle embolics can be used as embolization agents.

Process for modifying a polymer comprising the steps of (a) mixing the polymer with a maleimide-functionalized mono-azide and/or a citraconimide-functionalized mono-azide at a temperature in the range 80-250 C. to form a functionalized polymer, and (b) reacting the functionalized polymer with a substance containing one or more functional groups that can react with a maleimide or citraconimide functional group.

Process for modifying a polymer comprising the steps of (a) mixing the polymer with a maleimide-functionalized mono-azide and/or a citraconimide-functionalized mono-azide at a temperature in the range 80-250 C. to form a functionalized polymer, and (b) reacting the functionalized polymer with a substance containing one or more functional groups that can react with a maleimide or citraconimide functional group.

Biodegradable, cross-linked polymer particle embolics and methods of making the same are described. The particle embolics can be used as embolization agents.

An optical device having a first optical member, a second optical member, and an antistatic layer disposed between the first optical member and the second optical member wherein the antistatic layer contains the reaction product of a mixture comprising at least one polymerizable onium salt having an anion and at least one non-onium polymerizable monomer, oligomer, or polymer.

An optical device having a first optical member, a second optical member, and an antistatic layer disposed between the first optical member and the second optical member wherein the antistatic layer contains the reaction product of a mixture comprising at least one polymerizable onium salt having an anion and at least one non-onium polymerizable monomer, oligomer, or polymer.

Biodegradable, cross-linked polymer particle embolics and methods of making the same are described. The particle embolics can be used as embolization agents.

Biodegradable, cross-linked polymer particle embolics and methods of making the same are described. The particle embolics can be used as embolization agents.

A resist composition is provided comprising a polymer comprising recurring units (a) having an oxazolidinedione, thioxooxazolidinone, thiazolidinedione or thioxothiazolidinone structure and recurring unit (b1) having an acid labile group-substituted carboxyl group and/or recurring units (b2) having an acid labile group-substituted phenolic hydroxyl group. The resist composition suppresses acid diffusion, exhibits a high resolution, and forms a pattern of satisfactory profile with low edge roughness.

The present invention discloses a freezing-illumination method for preparing porous gels, comprising the steps of: (a) synthesizing the gels containing dynamic exchangeable bonds; (b) illuminating the gels under frozen state by certain wavelength light source; (c) elevating the temperature and melt the ice crystals within the gels to get the porous structure. The dynamic exchangeable bonds existing in the gels include double/multi-sulfur bond, hydrazine bond, boronic ester bond. Catalyst is also included in the gel composition to activate the bond exchange reactions under illumination. This new method for preparing porous gels is easy to operate and suitable for most kinds of gels. Meanwhile, it can spatially control the pore structure within the gels by local illumination.