Patents Assigned to Hoechst Celanese Corporation
  • Process for the preparation of substituted styrenes
    Patent number: 5247124
    Abstract: A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydiethylidene)bisphenol dimethyl ether. A process for preparing a bisarylalkyl ether by reacting a corresponding arylalkanol in the presence of an acid catalyst is also disclosed.
    Type: Grant
    Filed: August 25, 1992
    Date of Patent: September 21, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mohammad Aslam, Brad L. Smith, George Kvakovszky
  • Partially translucent white film having a metallized surface
    Patent number: 5246812
    Abstract: A white, partially translucent, metallized film article which having a flexible, heat resistant, polymeric film material with opposite sides. The film material has deposited on a first side a metal coating which is spectrally reflective and partially light transmissive in the visible region of the spectrum, is capable of transmitting from about 1% to about 70% of incident visible light cast thereon; the second side having a white outermost surface, and has a visible light opacity of from about 0.5 to about 0.98.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: September 21, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Robert J. von Trebra, Gerald A. Smith, Roy E. Hensel, Oliver A. Barton, deceased
  • Method for preparing a salt of 4-hydroxystyrene and for preparing 4-tertiary-butoxycarbonyloxystyrene therefrom
    Patent number: 5241098
    Abstract: The present invention pertains to a method of forming a salt of 4-hydroxystyrene by reacting 4-acetoxystyrene with a suitable base in a suitable solvent system. Subsequently, or simultaneously, the salt of 4-hydroxystyrene can be reacted, preferably in situ, with di-tertiary-butyl-dicarbonate to form 4-tertiary-butoxycarbonyloxystyrene.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: August 31, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: George Kvakovszky, James H. Rea, Michael T. Sheehan, Brad L. Smith
  • Polyamide containing the hexafluoroisopropylidene group and process of using to form a positive image
    Patent number: 5240819
    Abstract: This invention is that of high temperature polyamides containing the hexafluoroisopropylidene group. The high temperature polyamides of the invention and photo or radiation sensitizers provide improved high temperature positive resists which can be developed in aqueous alkaline developer and thermally anneal to form heat resistant, polyoxazole relief structures suitable for use in microelectronic and printing applications. The positive photoresists of the invention have improved solubility in coating solvents and improved photospeed. The polyamides of the invention can be prepared by conventional condensation reactions; e.g. the condensation of a diamine and diacid chloride. In addition the polyamides of this invention provide high temperature protective coatings with superior adhesion properties in applications other than the photoresist area.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: August 31, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Werner H. Mueller, Dinesh N. Khanna, Bernd Hupfer
  • Photoresist article having a portable, conformable, built-on mask
    Patent number: 5240807
    Abstract: A water soluble built-on mask layer is provided on a photoresist composition disposed on a substrate. The photoresist comprises an o-quinone diazide and a novolak or paravinyl phenol resin. The built-on mask layer comprises a water soluble, photobleachable diazonium salt, a coupler for the diazonium salt and an acidic, polymeric, film forming resin such as polystyrene sulfonic acid.
    Type: Grant
    Filed: August 2, 1989
    Date of Patent: August 31, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Sangya Jain, Salvatore Emmi, Thomas S. Phillips
  • Process for making low optical density polymers and copolymers for photoresists and optical applications
    Patent number: 5239015
    Abstract: The present invention pertains to a process for the preparation of polymers comprising poly(4-hydroxystyrene) or substituted poly(4-hydroxystyrene) or both. The polymers have low optical density (absorbance) over a wavelength range from about 240 to about 260 nm, as well as low optical density over the near UV and visible spectrum (310 to 800 nm). Such polymers are produced by polymerizing 4-acetoxystyrene and/or substituted 4-acetoxystyrene monomers, with or without other comonomers, and subsequently performing transesterification. In the most preferred embodiment of the present invention, the polymers are produced using at least one alcohol as a reaction medium, a chain transfer agent and a transesterification reactant, providing an unusually economic process. These polymers are particularly useful as photoresist components for use in combination with deep UV, X-ray, and E-Beam imaging systems.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: August 24, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Michael T. Sheehan, James H. Rea
  • Drawn polyester yarn having a high tenacity and high modulus and a low shrinkage
    Patent number: 5238740
    Abstract: The instant invention is directed to a drawn polyester yarn. This yarn is characterized by an initial secant modulus greater than 150 grams per denier/100%. The yarn may be further characterized by either a shrinkage of less than 8% or a tenacity of greater than 7.5 grams per denier. Alternatively, the yarn is characterized by a tenacity of at least 10 grams per denier, an initial modulus of at least 120 grams per denier/100% and a shrinkage of less than 8%.
    Type: Grant
    Filed: November 20, 1992
    Date of Patent: August 24, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: F. Holmes Simons, Ronald L. Griffith
  • Process for recycling polyester/cotton blends
    Patent number: 5236959
    Abstract: A process for recycling polyester/cotton blends by reducing the polyester to a lower dialkyl ester of terephthalic acid and reducing the cotton to cellulose acetate. The novel process to recycle the polyester/cotton blends includes the steps of (a) providing a blend of polyester and cotton fibers; (b) subjecting the polyester/cotton blend to a first alcoholysis in a bath containing an alcohol and an effective catalyst at a suitable temperature until the polyester is depolymerized to a lower molecular weight polyester oligomer; (c) remove the cotton fibers from the alcoholic solution of oligomers and process the recovered cotton fibers by pulping and acetylyzing processes to recover the cellulose acetate; and (d) alcoholyze the low molecular weight polyester oligomers to produce the lower dialkyl ester of terephthalic acid.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: August 17, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Etheridge O. Oakley, Frederick J. Gorman, James D. Mason
  • Photopolymerizable, positive working, peel developable, single sheet color proofing system
    Patent number: 5236806
    Abstract: This invention relates to positive working photopolymerizable sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process.
    Type: Grant
    Filed: June 13, 1991
    Date of Patent: August 17, 1993
    Assignee: Hoechst Celanese Corporation
    Inventor: Stephan J. W. Platzer
  • Amphoteric copolymer derived from vinylpyridine and acetoxystyrene
    Patent number: 5232995
    Abstract: A unique polymer was synthesized via copolymerization of vinylpyridine and acetoxystyrene under radical-initiated conditions followed by acidic or basic hydrolysis of the acetoxy group to afford the corresponding hydroxy group. The built-in acid-base dual functionality (phenolic and pyridyl units) in this polymer backbone gives rise to its unique solubility properties over a wide pH range in both aqueous and non-aqueous media. Due to its amphoteric nature, this polymer finds application as an anti-stat, viscosity modifier, and/or ion-exchange resin.
    Type: Grant
    Filed: January 12, 1993
    Date of Patent: August 3, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Apurba Bhattacharya, Kenneth G. Davenport, Michael T. Sheehan, James R. Sounik
  • Preparation of 4-(6'-methoxy-2'-naphthyl)-3-buten-2-one
    Patent number: 5225603
    Abstract: An intermediate for the manufacture of nabumetone, 4-(6'-methoxy-2'-naphthyl)-3-buten-2-one, is prepared by contacting 2-bromo-6-methoxynaphphalene with methyl vinyl ketone in the presence of a palladium catalyst at from about 50.degree. C. to about 200.degree. C. for a time sufficient to cause substantially complete reaction to occur.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: July 6, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mohammad Aslam, Varadaraj Elango
  • Texture carpets and rugs made from fiber blends
    Patent number: 5223317
    Abstract: A blend of low shrinkage polyester fibers and high shrinkage polyester fibers is described. In particular, the blend includes high shrinkage PET copolymers having boiling water shrinkages from 6 to 11 percent and low shrinkage PET copolymer fibers having a shrinkage of less than 3 percent. Textured carpets and rugs made from the blend consistently have better initial tuft end point definition and, in most cases, better bulk than corresponding polyester carpets made from conventional polyester fibers.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: June 29, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: James A. Corbin, Allen J. Hopkins, Michael C. Whited
  • Preparation of optically active .alpha.-aryl propionic acids
    Patent number: 5223640
    Abstract: This invention provides a process to prepare optically active .alpha.-aryl propionic acids without the need for resolving a racemic mixture. In one embodiment of the process, an acetophenone is sequentially converted to a 1-alkyne, then to an .alpha.-aryl .beta.-silylated acrolein, and then to an acrylic acid, which is then asymmetrically hydrogenated to an optically active .alpha.-aryl propionic acid.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: June 29, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Ahmed M. Tafesh, Sambasivarao Kotha, Kenneth G. Davenport
  • Diazo ester of a benzolactone ring compound and positive photoresist composition and element utilizing the diazo ester
    Patent number: 5221592
    Abstract: A photosensitizer comprising a diazo ester of benzolactone ring compound, such as phenolphthalein or cresolphthalein as the backbone, where at least one of the hydroxy groups on the benzolactone ring compound has been esterified with diazo-sulfonyl chloride consisting of 60 to 100 mole % 2,1,4 or 2,1,5-diazo sulfonyl chloride or a mixture thereof, and a photoresist comprising an admixture of the photosensitizer, which is present in the photoresist composition in an amount sufficient to uniformly photosensitize the photoresist composition; a water insoluble, aqueous alkali soluble novolak resin, the novolak resin being present in the photoresist composition in an amount sufficient to form a substantially uniform photoresist composition and a suitable solvent.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: June 22, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Dinesh N. Khanna, Douglas McKenzie, Chester J. Sobodacha, Ralph R. Dammel
  • Process for the preparation of arylethylamines and substituted arylethylamines
    Patent number: 5220067
    Abstract: This invention provides a process for directly preparing hydrohalide salts of arylethylamines from (.alpha.-chloro-.alpha.-oximino)acetophenones. The process involves hydrogenation in presence of a transition metal catalyst in an organic acid in substantial absence of moisture. The process is illustrated by conversion of 4-hydroxy (.alpha.-chloro-.alpha.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: June 15, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Ahmed Tafesh, B. Frank Wood, Joseph A. McDonough, Graham N. Mott
  • Method for the preparation of arylalkanolacylamides
    Patent number: 5220063
    Abstract: Acylamides or amine acylate salts of arylalkanolamines are prepared by reacting an arylisonitrosoalkanone with hydrogen and a carboxylic acid, carboxylic acid anhydride or carboxylic acid ester or mixture thereof in the presence of a transition metal catalyst; optionally the product is converted to the corresponding arylalkanolamine hydrochloride salt by reaction of the acylamide or amine acylate salt of the arylalkanolamine with hydrogen chloride in a C.sub.1 -C.sub.3 alkyl alcohol.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: June 15, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Ahmed M. Tafesh, Olan S. Fruchey, Charles B. Hilton
  • Process for the preparation of arylethylamines and substituted arylethylamines
    Patent number: 5220066
    Abstract: This invention provides a process for directly preparing arylethylamines and their salts from (.alpha.-halo-.alpha.-oximino)acetophenones. The process involves hydrogenation in presence of a transition metal catalyst. The process is illustrated by conversion of 4-hydroxy-(.alpha.-chloro-.alpha.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: June 15, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Ahmed Tafesh, B. Frank Wood, Joseph A. McDonough, Graham N. Mott
  • Image reversal negative working o-quinone diazide and cross-linking compound containing photoresist process with thermal curing treatment and element produced therefrom
    Patent number: 5217840
    Abstract: A process for converting a normally positive working photosensitive composition to a negative working composition. One forms a composition containing an alkali soluble resin, a 1,2 quinone diazide-4-sulfonyl compound and an acid catalyzed crosslinker in a solvent mixture. After drying and imagewise exposing, the composition is baked and developed to produce a negative image.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: June 8, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark A. Spak, Donald Mammato, Dana Durham, Sangya Jain
  • Central hubs for flexible magnetic data discs formed of magnetically soft polyacetal compositions
    Patent number: 5214555
    Abstract: Flexible sheet-like magnetic discs (so-called "floppy discs") are provided with a central hub formed of a magnetically soft polyacetal composition. The polyacetal composition necessarily includes a polyacetal resin and elemental iron particles homogeneously dispersed throughout the polyacetal resin in an amount sufficient to impart the desired soft magnetic properties to the inherently nonmagnetic polyacetal base resin. The polyacetal compositions of this invention are injection-moldable so that central hubs for flexible magnetic discs can be rapidly and economically produced.
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: May 25, 1993
    Assignee: Hoechst Celanese Corporation
    Inventor: Patrick M. Hughes
  • Method for the manufacture of 1,3-propanediol
    Patent number: RE34349
    Abstract: 1,3-Propanediol is manufactured by the hydration of acrolein in an aqueous solution over a fully hydrated, alumina-bound zeolite with a pore size >5 angstroms to form 3-hydroxypropanal and hydrogenation of the 3-hydroxypropanal typically in an aqueous solution in the presence of a nickel catalyst.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: August 17, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Jerry D. Unruh, Debra A. Ryan, Ioan Nicolau