Acetylation Patents (Class 8/121)
  • Patent number: 9125404
    Abstract: The invention relates to a method for treating wood in order to improve its properties of use and storage, and to thus obtained treated wood product. In the method the wood to be treated is contacted with a treatment composition comprising monoester, diester or triester or a mixture thereof formed by a water soluble C1-C10 alcohol and formic acid as an equilibrium solution. In addition, the invention relates to specific treatment solution compositions.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: September 8, 2015
    Inventors: Antti Vuori, Timo Nissinen
  • Patent number: 7300705
    Abstract: Methods for esterifying hydroxyl groups in cellulose, hemicellulose, and lignin in wood are described, wherein the wood is chosen from loblolly, slash, shortleaf, longleaf or radiata pines. Methods can include solvent drying techniques and heating provided by electromagnetic radiation, such as microwave, and radiofrequency. Products made from the methods are described that have greater decay resistance and dimensional stability as compared with non-esterified wood products.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: November 27, 2007
    Assignee: Weyerhaeuser Company
    Inventors: Amar N. Neogi, Gary D. Peterson, James Shaw
  • Patent number: 6602451
    Abstract: A wooden material is made by bonding together with a binder resin, ozonized wood elements obtained by acetylating wood elements and then ozonizing the acetylated wood elements.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: August 5, 2003
    Assignees: Forestry and Forest Product Research Institute, Yamaha Corporation
    Inventors: Hideaki Korai, Makoto Kiguchi, Ritsuo Iwata, Yoshihiro Hirano, Satoshi Suzuki
  • Patent number: 5879408
    Abstract: Stainproofing properties are imparted to a cellulose fiber by 1) esterifying a part of hydroxyl groups of the cellulose fiber in a heterogeneous reaction system and 2) subjecting the partially esterified cellulose fiber to a stainproofing treatment with an aqueous solution or emulsion of a copolymer having repeating units derived from a fluroalkyl group-containing polymerizable compound and a compound represented by the general formula:CH.sub.2 .dbd.CR.sup.1 COO--(XO).sub.m --(YO).sub.n --R.sup.2( 1)wherein X is --CH(CH.sub.3)--CH.sub.2 -- or --CH.sub.2 --CH(CH.sub.3)--; Y is --CH.sub.2 CH.sub.2 --; R.sup.1 is a hydrogen atom or a methyl group; R.sup.2 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; and each of m and n is an integer of 0 to 50, provided that the total of m and n is an integer of 1 to 70.
    Type: Grant
    Filed: June 12, 1997
    Date of Patent: March 9, 1999
    Assignee: Daikin Industries Ltd.
    Inventors: Motonobu Kubo, Takashi Enomoto
  • Patent number: 5731083
    Abstract: Carboxymethyl cellulose fiber having a degree of substitution of at least 0.1, preferably 0.2-0.5, carboxymethyl groups per glucose unit is derived from solvent-spun cellulose fiber, for example by reaction with a strong alkali and a monochloroacetate reagent. The fiber has an absorbency of at least 8 grams, usually at least 15 grams, 0.9% saline solution per gram of fibre and a tenacity of at least 10, usually at least 15, cN/tex. It can be used for absorbent personal products.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: March 24, 1998
    Assignee: Courtaulds PLC
    Inventors: Hardev Singh Bahia, Jim Robert James
  • Patent number: 5580356
    Abstract: The fibrillation tendency of solvent-spun cellulose fibre is reduced by treating the fibre with a cross-linking agent and a flexible linear polymer with terminal functional groups, for example polyethylene glycol (PEG) of molecular weight 300 to 600. The fibre may be treated in never-dried or in fabric form.
    Type: Grant
    Filed: August 17, 1995
    Date of Patent: December 3, 1996
    Assignee: Courtaulds Fibres (Holdings) Limited
    Inventor: James M. Taylor
  • 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
  • Patent number: 4804384
    Abstract: Reaction of lignocellulosic material with uncatalyzed acetic anhydride in the absence of any cosolvent is disclosed. The process improves dimensional stability and resistance to biological attack of the lignocellulosic material. Lignocellulosic material is treated by exposure to liquid acetic anhydride for at least a short period of time, after which it is then heated to acetylate the material. The excess anhydride and byproduct acetic acid can be removed by vacuum.
    Type: Grant
    Filed: April 8, 1987
    Date of Patent: February 14, 1989
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Roger M. Rowell, Rune Simonson, Anne-Marie Tillman
  • Patent number: 4592962
    Abstract: A process for acetylating a wood material which comprises impregnating the wood material with an aqueous solution of an alkali metal acetate, drying the wood material containing the alkali metal acetate solution, and treating the dried wood material with acetic anhydride optionally diluted with an organic solvent at temperature between C. and C.
    Type: Grant
    Filed: May 11, 1984
    Date of Patent: June 3, 1986
    Assignee: Daiken Trade & Industry Co., Ltd.
    Inventors: Eiichi Aoki, Hideyuki Kobayashi
  • Patent number: 4152115
    Abstract: Water repellancy is imparted to fibrous cellulosic textile material by applying to it, for a very short period of time, an isopropenyl ester containing a catalytic amount of an acid catalyst and then heat curing the treated material. Excellent water repellancy is obtained at a very low degree of substitution and a high degree of retention of tensile strength.
    Type: Grant
    Filed: February 15, 1978
    Date of Patent: May 1, 1979
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Leonard S. Silbert, Samuel Serota, Gerhard Maerker
  • Patent number: 3937671
    Abstract: Textile wastes composed of blended polyester and cellulose fibers are subjected to the action of glacial acetic acid and acetic anhydride in the presence of a catalyst under conditions which serve to convert the cellulose component of the waste to cellulose acetate which is separated from the unreacted polyester component in the form of a solution adapted to be used in the manufacture of cellulose derivatives whereas the polyester is recovered in a form which may be garnetted to obtain a staple fiber for reuse.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: February 10, 1976
    Assignee: Textile Research Institute
    Inventors: Irving Gruntfest, Rudolph Turner, Ludwig Rebenfeld