Patents by Inventor Fu-Fong Chang

Fu-Fong Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for aqueous polyurethane blocking reaction
    Patent number: 5789518
    Abstract: An improved method of reaction of water PU resins for improving the blocking reactions of beta-dicarbynal compounds and polisocynantes, and reducing the reaction time for water PU blocking, wherein the construction is: ##STR1## wherein: R.sub.1,R.sub.2,R.sub.3,R.sub.4 =hydrogen or alkyl groupn.sub.1 =1.about.100n.sub.2, n.sub.3, n.sub.4 =1.about.10The blocking agents of beta-Dicarbonyl compounds are reduced by D.sub.1 and D.sub.2 which are used in the blocking reactions of water PU.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: August 4, 1998
    Assignee: China Textile Institute
    Inventors: Shin-Chuan Yao, Jongfu Wu, Kun-Lin Cheng, Wen-Tung Chen, Fu-Fong Chang
  • Soluble, solid or crosslinked graft copolymers of lignin (2-propenamide)-(2-methyl-3-oxo-4-oxybut-1-ene-(p-ethoxy-(3*p+3)-ol), methods of making the same and uses therefore
    Patent number: 5194552
    Abstract: A soluble, solid, or crosslinked graft copolymer of lignin-(2-propenamide)-(2-methyl-3-oxo-4-oxybut-1-ene-(p-ethoxy-(3*p+3)-ol ) having a central lignin network and at least one grafted side chain, R, having randomly repeating units of the formula: ##STR1## such that the central lignin network has a molecular weight of about 1,000 to 150,000; the number of ethoxyl repeat units, p, in the polyol repeat unit is between 1 and 300,000; and the total number of random units in the grafted side chain, n+m, or chains, x*(n+m), is in the range of 1 to 300,000 units, such that the total copolymer molecular weight is in the range of 1,000 to 300,000,000.The copolymers of the present invention are useful as 1) thickeners for water and aqueous solutions or 2) plastics and elastomers.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: March 16, 1993
    Inventors: John J. Meister, Amit Lathia, Fu-Fong Chang
  • Soluble, solid, or crosslinked graft copolymers of lignin (2-propenamide)-(2-methyl-3-oxo-4-oxybut-1-ene- (p-ethoxy-(3*p+3)-0l), methods of making the same and uses therefore
    Patent number: 5116904
    Abstract: A soluble, solid, or crosslinked graft copolymer of lignin-(2-propenamide)-(2-methyl-3-oxo-4-oxybut-1-ene-(p-ethoxy-(3*p +3)-ol) having a central lignin network and at least one grafted side chain, R, having randomly repeating units of the formula: ##STR1## such that the central lignin network has a molecular weight of about 1,000 to 150,000; the number of ethoxyl repeat units, p, in the polyol repeat unit is between 1 and 300,000; and the total number of random units in the grafted side chain, n+m, or chains, x*(n+m), is in the range of 1 to 300,000 units, such that the total copolymer molecular weight is in the range of 1,000 to 300,000,000.The copolymers of the present invention are useful as 1) thickeners for water and aqueous solutions or 2) plastics and elastomers.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: May 26, 1992
    Inventors: John J. Meister, Amit Lathia, Fu-Fong Chang