Compositions including a sintered porous ultra-high-molecular-weight polypropylene material having a viscosity average molecular weight over 500,000, an average porc size ranging from 10 m to 200 m, and a porosity ranging from 20% to 60%. Devices and methods including such compositions.

This disclosure relates to thermoplastic polyurethane (TPU) powders derived from expanded TPU and/or molding part thereof, wherein the average particle size D50 of the powders is no more than 1 mm, to a 3D molding formed from the same and to a process of forming the 3D molding. The TPU powders of the present invention can be used to prepare 3D products with low density, high rebound resilience and good mechanical properties, and the TPU powders of the present invention can be derived from a wide range of sources, and the TPU powders and 3D products of the present invention can be easily reused.

PLA polymers that can be expanded into microporous articles having a node and fibril microstructure are provided. The fibrils contain PLA polymer chains oriented with the fibril axis. Additionally, the PLA polymers have an inherent viscosity greater than about 3.8 dL/g and a calculated molecular weight greater than about 150,000 g/mol. The PLA polymer article may be formed by bulk polymerization where the PLA bulk polymer is made into a preform that is subsequently expanded at temperatures above the glass transition temperature and below the melting point of the PLA polymer. In an alternate embodiment, a PLA polymer powder is lubricated, the lubricated polymer is subjected to pressure and compression to form a preform, and the preform is expanded to form a microporous article. Both the preform and the microporous article are formed at temperatures above the glass transition temperature and below the melting point of the PLA polymer.

PLA polymers that can be expanded into microporous articles having a node and fibril microstructure are provided. The fibrils contain PLA polymer chains oriented with the fibril axis. Additionally, the PLA polymers have an inherent viscosity greater than about 3.8 dL/g and a calculated molecular weight greater than about 150,000 g/mol. The PLA polymer article may be formed by bulk polymerization where the PLA bulk polymer is made into a preform that is subsequently expanded at temperatures above the glass transition temperature and below the melting point of the PLA polymer. In an alternate embodiment, a PLA polymer powder is lubricated, the lubricated polymer is subjected to pressure and compression to form a preform, and the preform is expanded to form a microporous article. Both the preform and the microporous article are formed at temperatures above the glass transition temperature and below the melting point of the PLA polymer.

PLA polymers that can be expanded into microporous articles having a node and fibril microstructure are provided. The fibrils contain PLA polymer chains oriented with the fibril axis. Additionally, the PLA polymers have an inherent viscosity greater than about 3.8 dL/g and a calculated molecular weight greater than about 150,000 g/mol. The PLA polymer article may be formed by bulk polymerization where the PLA bulk polymer is made into a preform that is subsequently expanded at temperatures above the glass transition temperature and below the melting point of the PLA polymer. In an alternate embodiment, a PLA polymer powder is lubricated, the lubricated polymer is subjected to pressure and compression to form a preform, and the preform is expanded to form a microporous article. Both the preform and the microporous article are formed at temperatures above the glass transition temperature and below the melting point of the PLA polymer.

The present application provides a porous sintered multicomponent applicator nib and methods of making and using these nibs. The porous nibs are made from sintered plastic particles. These nibs are used with liquid applicators devices, medical devices, writing tools or cosmetic applicators to apply liquids containing high solids or pigments to surfaces such as metal, paper, skin, hair, tissue or a wound.

The invention relates to a process for generating a porous material having homogeneous, gas-containing inclusions in the micrometer and sub-micrometer range, and also to the material produced by such process.

The invention relates to a process for generating a porous material having homogeneous, gas-containing inclusions in the micrometer and sub-micrometer range, and also to the material produced by such process.

There are provided a porous water-soluble nonionic cellulose ether having an average pore size of 36 m or smaller and an average particle size of from 30 to 300 m; and a method for continuously producing said cellulose ether comprising the steps of: pulverizing a first water-soluble nonionic cellulose ether to obtain a first pulverized product, and sieving the pulverized product through a sieve having an opening of from 40 to 400 m to obtain a first residue-on-sieve and a first sieve-passing fraction, wherein a portion or all of the first residue-on-sieve containing particles having particle sizes smaller than and greater than the opening of the sieve is re-pulverized together with a second water-soluble nonionic cellulose ether in the step of pulverizing to obtain a second pulverized product, which is pulverized to obtain the cellulose ether as a second sieve-passing fraction containing the re-pulverized particles.

There are provided a porous water-soluble nonionic cellulose ether having an average pore size of 36 m or smaller and an average particle size of from 30 to 300 m; and a method for continuously producing said cellulose ether comprising the steps of: pulverizing a first water-soluble nonionic cellulose ether to obtain a first pulverized product, and sieving the pulverized product through a sieve having an opening of from 40 to 400 m to obtain a first residue-on-sieve and a first sieve-passing fraction, wherein a portion or all of the first residue-on-sieve containing particles having particle sizes smaller than and greater than the opening of the sieve is re-pulverized together with a second water-soluble nonionic cellulose ether in the step of pulverizing to obtain a second pulverized product, which is pulverized to obtain the cellulose ether as a second sieve-passing fraction containing the re-pulverized particles.