E.i. Dupont De Nemours and Company

Roger Keith Siemionko

Hyunkook Shin

Ervin Townsend Powers, Jr

David Jackson McGinty

David Martin Taylor

Nanlin Deng

Carl G Krespan

Joachim C Ritter

Hyun Sung Lim

David J Rodini

Steven R Allen

Rajiv Dhawan

Frederick K Mallon

Robert H Peterson

James R Vincent

New triaminophenol compositions and related compounds are disclosed, as are processes for their preparation and for the preparation of novel salts and diacid complexes from such compounds. Polymers prepared from these compositions can be made into high strength fiber, film, and tape and are useful in applications such as protective apparel, aircraft, automotive components, personal electronics, and sports equipment.

2,4,5-triaminophenols and related compounds

A process for the preparation of plexifilamentary film-fibril strands of synthetic fiber-forming polymer comprises the steps of generating a spin fluid and flash-spinning the spin fluid to form plexifilamentary film-fibril strands of the synthetic fiber-forming polymer. The spin fluid consists essentially of (a) 5 to 30 wt. % of a synthetic fiber-forming polymer, (b) a primary spin agent selected from the group consisting of hydrocarbons with 4 to 7 carbon atoms, and chlorinated, brominated and fluorinated compounds, and (c) a co-spin agent co-spin agent selected from the group consisting essentially of fluorinated organic compounds containing 4 to 8 carbon atoms and a double bond, and having an atmospheric boiling point of less than 100&#xb0; C. The co-spin agent is present in the spin fluid in an amount sufficient to raise the cloud point pressure of the spin fluid by at least 50 pounds per square inch (345 kPa). A spin fluid used in the process of the invention is also provided.

Flash-spinning process and solution

The efficiency of electrostatic charging of polyolefin web in a process for flash-spinning polyolefin plexifilament from solution in a C -C hydrocarbon, forming the plexifilament into a web, electrostatically charging the web, and laying the web down as a sheet is improved by having present in the electrostatic charging step environment a charge-improving compound, which can be any one of a number of specifically identified classes of charge-improving compounds. The charge improving compounds are present in an amount of at least 0.1 ppm of the atmosphere in that environment or more.

Process for improving electrostatic charging of plexifilaments

A spinning process using azeotropic compounds as spin agents having essentially zero ozone depletion potential and that are either non-flammable or of very low flammability.

Flash spinning process and flash spinning solution with azeotropes

A process for producing plexifilamentary products by spinning from a spin fluid of a polyolefin dissolved in a primary spin agent selected from the group consisting of 1,1,2-trichloro-2,2-difluoroethane and isomers thereof; 1,1,3-trichloro-2,2,3,3-tetrafluoropropane and isomers thereof; 1,2-dichloro-3,3,3-trifluoropropane and isomers thereof; and 1,2-dichloro-1-fluoroethylene; and a co-spin agent; and also a spin fluid of a polyolefin dissolved in a primary spin agent selected from the group consisting of 1,1,2-trichloro-2,2-difluoroethane and isomers thereof, 1,1,3-trichloro-2,2,3,3-tetrafluoropropane and isomers thereof; 1,2-dichloro-3,3,3-trifluoropropane and isomers thereof; and 1,2-dichloro-l-fluoroethylene; and a co-spin agent.

Flash spinning solution

A process for producing plexifilamentary products by spinning from a spin fluid of a polyolefin dissolved in a primary spin agent selected from the group consisting of 1,1,2-trichloro-2,2-difluoroethane and isomers thereof; 1,1,3-trichloro-2,2,3,3-tetrafluoropropane and isomers thereof; 1,2-dichloro-3,3,3-trifluoropropane and isomers thereof; and 1,2-dichloro-1-fluoroethylene; and a co-spin agent; and also a spin fluid of a polyolefin dissolved in a primary spin agent selected from the group consisting of 1,1,2-trichloro-2,2-difluoroethane and isomers thereof; 1,1,3-trichloro-2,2,3,3-tetrafluoropropene and isomers thereof; 1,2-dichloro-3,3,30-trifluoropropane and isomers thereof; and 1,2-dichloro-1-fluoroethylene; and a co-spin agent.

Flash spinning process and flash spinning solution

Flash spinning process

A process for producing plexifilamentary products by spinning from a spin fluid of a polyolefin dissolved in a primary spin agent selected from the group consisting of 1,1,2-trichloro-2,2-difluoroethane and isomers thereof; 1,1,3-trichloro-2,2,3,3-tetrafluoropropane and isomers thereof; 1,2-dichloro-3,3,3-trifluoropropane and isomers thereof; and 1,2-dichloro-l-fluoroethylene; and a co-spin agent; and also a spin fluid of a polyolefin dissolved in a primary spin agent selected from the group consisting of 1,1,2-trichloro-2,2-difluoroethane and isomers thereof; 1,1,3-trichloro-2,2,3,3-tetrafluoropropane and isomers thereof; 1,2-dichloro-3,3,3-trifluoropropane and isomers thereof; and 1,2-dichloro-1-fluoroethylene; and a co-spin agent.

A flash-spinning solution of a polyolefin dissolved in a primary solvent selected from the group consisting of methylene chloride and dichloroethylene, and a co-solvent selected from the group of hydrofluoroethers, cyclic perfluorinated hydrocarbons, and cyclic partially fluorinated hydrocarbons.

Flash-spinning solution

A spin solution of a polyolefin dissolved in a primary solvent selected from the group consisting of methylene chloride and dichloroethylene, and a cyclic partially fluorinated hydrocarbon co-solvent, and a process for producing plexifilamentary polyolefin products by flash-spinning the spin solution.

Flash-spinning process

A process for producing plexifilamentary products by spinning from a solution of a primary solvent selected from the group consisting of methylene chloride and 1,2-dichloroethylene and a co-solvent, and a spin solution of a polyolefin dissolved in a primary solvent selected from the group consisting of methylene chloride, and 1,2-dichloroethylene, and a co-solvent.

The efficiency of electrostatic charging of polyolefin web in a process for flash-spinning polyolefin plexifilament from solution in a C.sub.4 -C.sub.7 hydrocarbon, forming the plexifilament into a web, electrostatically charging the web, and laying the web down as a sheet is improved by having present in the electrostatic charging step environment a charge-improving compound, which can be any one of a number of specifically identified classes of charge-improving compounds. The charge improving compounds are present in an amount of at least 0.1 ppm of the atmosphere in that environment or more.

A process for hydraulically needling a web of staple fibers into an unbonded flash spun web made of continuous plexifilaments to form a spunlaced nonwoven fabric. The web of staple fibers is positioned against the unbonded flash spun web and then hydraulically needled such that the staple fibers are embedded into and entangled with the unbonded flash spun web to form a spunlaced nonwoven fabric. Optionally, the spunlaced nonwoven fabric can be thermally bonded to maintain or increase the permeability of the fabric. Thermal bonding can be used to control the level of permeability depending on the end-use desired. Spunlaced nonwoven fabrics made by the inventive process are particularly useful in filtration applications (e.g., vacuum cleaner bags) when thermal bonding is employed and as bulky, downproof and featherproof barrier liners for garments, sleeping bags, pillows, comforters and the like when thermal bonding is not employed.

Hydroentangled flash spun webs having controllable bulk and permeability

Filaments, films or moldings are prepared from meltable polyesters derived from chloro- or methyl-hydroquinone, terephthalic acid, a member of the group consisting of 4,4'-dihydroxybiphenyl, and 4-carboxy-4'-hydroxybiphenyl and a member of the group consisting of isophthalic acid, resorcinol and 1,3-hydroxybenzoic acid. As-spun filaments from these polymers can be heat treated while free from tension to increase their tenacity.

Aromatic polyesters and high strength filaments thereof

Fiber-forming aromatic polyester consisting essentially of 1,4-dioxyphenylene units, isophthaloyl units, p-oxybenzoyl units and 6-oxy-2-naphthoyl units.

Growing community of inventors

Hockessin, DE, United States of America

Roger Keith Siemionko