Polytetramethylene Glycols Patents (Class 568/617)
  • Ethoxylated polytetramethylene glycols as fiber lubricants
    Patent number: 4245004
    Abstract: There are disclosed block copolymer lubricants for synthetic textile fibers which are compounds derived from tetramethylene oxide (tetrahydrofuran) and ethylene oxide of the formula:Y--(CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2 --O--)--(C.sub.2 H.sub.4 O)--H].sub.
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: January 13, 1981
    Assignee: BASF Wyandotte Corporation
    Inventors: Robert B. Login, David D. Newkirk
  • Alcoholysis process for preparing poly-(tetramethylene ether) glycol
    Patent number: 4230892
    Abstract: Poly(tetramethylene ether) ester is converted to poly(tetramethylene ether) glycol by alcoholysis using as a catalyst an oxide, hydroxide or alkoxide of calcium, strontium, barium or magnesium.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: October 28, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Gerfried Pruckmayr
  • Method of catalytically preparing tetrahydrofuran/alkylene oxide polymerizates using a montmorillonite clay as the catalyst
    Patent number: 4228272
    Abstract: A polymerizate of THF and an alkylene oxide is prepared by catalytic polymerization, using as a catalyst an acid-activated montmorillonite clay having a pore volume of 0.4-0.8 cubic centimeter per gram, a surface area of 220-260 square meters per gram and an average pore diameter of 0.1-0.3 micron.
    Type: Grant
    Filed: March 27, 1979
    Date of Patent: October 14, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Thomas W. Del Pesco
  • Process for the production of polytetramethylene ether glycol
    Patent number: 4209641
    Abstract: An improved process for the production of polytetramethylene ether glycol is disclosed. Polytetramethylene ether glycol is obtained with a high yield by subjecting tetrahydrofuran to ring opening polymerization in the presence or absence of an organic solvent with the use of, as a catalyst, a lithium halide in conjunction with fuming sulfuric acid. Average molecular weight of the glycol product can be controlled in the range of 1000-3000 at will by varying the amounts of the lithium halide and fuming sulfuric acid used.
    Type: Grant
    Filed: December 5, 1978
    Date of Patent: June 24, 1980
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Takayoshi Masuda, Tsutomu Takase, Yoshimoto Watanabe, Fumio Yamazaki
  • Method for reducing oligomeric cyclic ether content of a polymerizate
    Patent number: 4202964
    Abstract: The oligomeric cyclic ether content of a tetrahydrofuran/alkylene oxide polymerizate is significantly reduced by bringing the polymerizate into contact at elevated temperatures with an ion exchange resin bearing -SO.sub.3 H groups.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: May 13, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Gerfried Pruckmayr, Ivan M. Robinson
  • Method for reducing oligomeric cyclic ether content of a polymerizate
    Patent number: 4192943
    Abstract: The oligomeric cyclic ether content of a tetrahydrofuran/alkylene oxide polymerizate is significantly reduced by bringing the polymerizate into contact with an acid-activated sodium or calcium montmorillonite clay.
    Type: Grant
    Filed: December 21, 1978
    Date of Patent: March 11, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Ivan M. Robinson
  • Heteric/block polyoxyalkylene compounds as crude oil demulsifiers
    Patent number: 4183821
    Abstract: There are disclosed polyoxyalkylene compound demulsifying agents derived from tetrahydrofuran and C.sub.2 -C.sub.4 vicinal alkylene oxides which are heteric/block copolymers; a process for the preparation of said polyoxyalkylene compounds; a demulsified petroleum crude oil; and a batch or continuous process for the demulsification of crude petroleum oil.
    Type: Grant
    Filed: May 26, 1978
    Date of Patent: January 15, 1980
    Assignee: BASF Wyandotte Corporation
    Inventors: William K. Langdon, Ronald L. Camp
  • Preparation of esters of poly-(tetramethylene ether) glycol
    Patent number: 4163115
    Abstract: Esters of poly(tetramethylene ether) glycol are prepared by polymerizing tetrahydrofuran in a reaction mixture which contains, in addition to the tetrahydrofuran, and acylium ion precursor such as acetic anhydride, a polymeric catalyst which contains sulfonic acid groups and, optionally, a carboxylic acid such as acetic acid.
    Type: Grant
    Filed: January 13, 1978
    Date of Patent: July 31, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George E. Heinsohn, Ivan M. Robinson, Gerfried Pruckmayr, Walter W. Gilbert
  • Aliphatic diisocyanates
    Patent number: 4148819
    Abstract: Covers a diisocyanate having the following structural formula: ##STR1## WHERE X IS AN AVERAGE NUMBER RANGING FROM ABOUT 6 TO 50, AND Y AND Z ARE AVERAGE NUMBERS RANGING FROM ABOUT 1 TO ABOUT 20, WITH THE SUM OF Y AND Z BEING FROM ABOUT 6 TO ABOUT 40. Also covers a method of preparing said diisocyanate.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: April 10, 1979
    Assignee: Texaco Development Corp.
    Inventors: Lewis W. Watts, Jr., Clifford L. Lambert, Jr., Edward T. Marquis
  • Process for the removal of catalyst from polyether polyol
    Patent number: 4129718
    Abstract: An improvement in the process of alkaline catalyst removal from crude polyoxyalkylene ether polyols is achieved by treating a mixture of crude polyol, adsorbent, and water with carbon dioxide just prior to filtration.
    Type: Grant
    Filed: December 1, 1977
    Date of Patent: December 12, 1978
    Assignee: BASF Wyandotte Corporation
    Inventor: John A. Muzzio