OMPI – Búsqueda en las colecciones de patentes nacionales e internacionales

1.WO/1990/013415NON-STICK BONDER ROLL COATING

WO - 15.11.1990

Clasificación Internacional B05D 5/08 Nº de solicitud PCT/US1989/001989 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a HENRY, Carolyn, MacLeod

This invention provides a non-stick coating on bonder rolls used in the manufacture of polyolefin film-fibril sheets. The coating comprises at least one primer layer of polytetrafluoroethylene containing chromic acid and phosphoric acid and at least one topcoat layer of perfluorinated vinyl ether copolymers of tetrafluoroethylene and poly(propyl vinyl ether).

2.WO/1990/014212APPARATUS FOR REMOVING FOULING DEPOSITS FROM DIELECTRIC SURFACE OF ELECTROSTATIC CHARGE TARGET ELECTRODE

WO - 29.11.1990

Clasificación Internacional B08B 1/00 Nº de solicitud PCT/US1989/002004 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a BEDNARZ, Thomas, K.

An apparatus for removing from dielectric surface of electrostatic target electrode fouling deposits generated substantially as tiny solidified polymer particles during flash-spinning of fibrous web structures. The particles are attracted to and deposited on the dielectric surface of the target electrode used for corona charging of the fibrous web structure and the resulting fouling deposit increases the rate of loss in charging efficiency of fibrous structures. The apparatus comprises a self-cleaning rotating brush (52) that removes fouling deposits and prevents build up thereof on the surface of the electrostatic target electrode (16, 18) and thusly significantly increases charging efficiency and in-process lifetime of target electrode dielectric surfaces (16, 18).

3.WO/1990/014228IMPROVED DIELECTRIC SURFACE FOR ELECTROSTATIC CHARGE TARGET

WO - 29.11.1990

Clasificación Internacional D04H 3/16 Nº de solicitud PCT/US1989/002003 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a GRAHAM, John, C.

An improved dielectric surface coating (16) for electrostatic charge target electrodes (14) used in electrostatically charging flash-spun fibrous structures (26) being fed to and along the target surface. The dielectric surface coating is primarily comprised of a rubber copolymer formulation of acrylonitrile/butadiene and phenolic resin hardener and exhibits a volume resistivity in the range of about 2x10⁹ and 2x10¹⁰ ohm-cm when measured at 60°C and 1000 volts and a hardness in the range of 75-85 shore a Durometer. The dielectric surface coating significantly decreases coating degradation rate due to in-process environment and substantially reduces the loss in charging efficiency caused by flash-spun fouling deposits on target electrodes.

4.WO/1990/015173CONTROL OF FLASH SPINNING CELL ATMOSPHERE TEMPERATURE

WO - 13.12.1990

Clasificación Internacional D01D 5/11 Nº de solicitud PCT/US1989/002191 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a BEDNARZ, Thomas, Kenneth

A flash spinning process is disclosed wherein a polymer/solvent composition is sprayed from one or more dies onto a moving support (3) within a spin cell (15). The temperature within the spin cell is controlled by spraying solvent into the spin cell atmosphere whereby evaporation of the solvent reduces the temperature within the spin cell. The improvement is that the spin cell temperature is accurately controlled to within 48° to 52°C as required to enhance visual properties of the spun sheet and to maximize spin pack life.

5.WO/1990/013412FLASH EXTRUSION VALVE AND PROCESS FOR USING IT

WO - 15.11.1990

Clasificación Internacional B29C 37/00 Nº de solicitud PCT/US1989/001987 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a DEMPSEY, James, J.

A combination valve is disclosed which is useful in flash extrusion of polymer-liquid mixtures or polymer solutions. The combination valve comprises an automatically actuated main process fluid valve (13, 14) and an automatically actuated prime-flush valve (25, 26) in communication with the main process fluid channel (24) just downstream from the main process fluid valve. In operation the prime-flush valve is opened at start up to supply fluid under pressure to the main process fluid channel so that solvent does not evaporate and leave solid polymer to plug the system when the main process control valve is first opened. A shutdown, just as the main process control valve is being closed the prime-flush valve is opened to supply fluid to the system and remove polymer therefrom before it can solidify and plug the system thereby interfering with the next start up.

6.WO/1982/003028A HAND-HELD RIVET SETTING TOOL AND METHOD

WO - 16.09.1982

Clasificación Internacional B21J 15/04 Nº de solicitud PCT/US1981/000281 Solicitante MARSON CORPORATION Inventor/a TODISCO, Joseph

A tool (10) for setting rivet nuts (45) in which then non-rotatable collet (23) moved by handles (11, 12) receives in threaded engagement the mandrel holder (29) so that the mandrel holder (29) is axially adjustable with respect to the collet (23). Mandrels (36) are readily inserted in, secured to and removed from the mandrel holder (29) so that a selected mandrel (36) can be used for each type of rivet to be set against selected anvils (18, 20 and 62). Tool (10) is adjustable in various ways to ease placing the rivet (45) on the mandrel (36), affecting adjustment of the position of the rivet nut (45) vis-a-vis the anvil (18, 20 and 62) for a proper and effective pulling stroke and adjusting the travel of the collet during the stroke.

7.WO/1983/001445PROCESS FOR PREPARING PEAT FIBERS FROM PEAT

WO - 28.04.1983

Clasificación Internacional D01B 1/50 Nº de solicitud PCT/US1982/001451 Solicitante PEAT PRODUCTS INTERNATIONAL, INC. Inventor/a SCHMIDT, Evald, Gottfried

The process involves preparing a suspension of peat, whereby peat fibers are liberated from the parent material. Coarse particles are separated in a dewatering step, and peat fiber material of a desired water content is obtained. The invention provides a process in which colloidal particles resulting from suspending the peat are isolated from the colloid containing water, as a byproduct of peat processing, and in which the process water is recycled into the peat suspension. This makes it possible to use a simple, mobile installation which is suitable for use almost all year round, in relatively small peat areas which may be poorly drained or otherwise up to now unsuitable for peat exploitation. The peat fibers and colloid material obtained via the process have use as soil improvers and modifiers, as combustion material, and in cardboard and filter manufacture.

8.WO/1990/013366A METHOD FOR APPLYING A NON-STICK EMBOSSER ROLL COATING

WO - 15.11.1990

Clasificación Internacional B05D 5/08 Nº de solicitud PCT/US1989/001992 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a McHALE, William, F.

This invention provides a method for applying a coating on an embosser roll used for embossing polyolefin film-fibril sheets. The coating comprises a primer layer formed from an aqueous suspension of polytetrafluoroethylene with chromic acid and phosphoric acid and a topcoat layer of polytetrafluoroethylene or perfluorinated polyvinyl ether copolymers of tetrafluoroethylene and poly(propyl vinyl ether).

9.WO/1983/000331N-PHENYLPYRAZOLE DERIVATIVES

WO - 03.02.1983

Clasificación Internacional A01N 43/56 Nº de solicitud PCT/GB1982/000212 Solicitante MAY & BAKER LIMITED Inventor/a HATTON, Leslie, Roy

N-phenylpyrazole derivatives of formula:$(8,)$(wherein R12 represents a chlorine atom, R13 represents a hydrogen, fluorine or chlorine atom, R14 represents a hydrogen or fluorine atom and R15 represents a hydrogen, fluorine or chlorine atom, with the proviso that when R14 represents a fluorine atom, R15 represents a fluorine or chlorine atom, or R12, R13 and R15 each represent a fluorine atom and R14 represents a hydrogen or fluorine atom) possess useful herbicidal properties. Herbicidal compositions, method for controlling the growth of weeds and processes for the preparation of the N-phenylpyrazole derivatives are described, as well as intermediates of formula:

10.WO/1990/013689FLASH SPINNING PROCESS START-UP USING TOP AND BOTTOM LEADER SHEETS

WO - 15.11.1990

Clasificación Internacional D01D 5/11 Nº de solicitud PCT/US1989/001988 Solicitante E.I. DU PONT DE NEMOURS AND COMPANY Inventor/a HUDSON, Donald, Andrew, Jr.

The start-up of a process where a sheet (11) is flash-spun onto a moving conveyor belt (4') from one or more extrusion-die assemblies (1') is greatly facilitated by the use of two short length rolls (21, 26) of sheet material (22, 25) used to sandwich the initial spinnings (2'). The start-up sheets provide the initial strength and stability necessary for handling by normal rolls and wind-up mechanisms until the extrusion process can be fully stabilized.

1 / 521.062

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