Patents Represented by Attorney Lelie G. Nunn, Jr.

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  • Formaldehyde-free insolubilizers for binders for paper coating compositions
    Patent number: 4471087
    Abstract: A highly efficient formaldehyde-free coating composition insolubilizer is prepared by reacting about 3 moles of glyoxal with 1 mole of urea resulting in a formation of a low molecular weight oligomer in a yield of 95-96%. The molar ratio of glyoxal to urea is very critical in obtaining the highest efficiency and is kept within narrow limits. The coating compositions of the present invention possess 2 till 4 times higher wet-rub resistance than the prior art compositions.
    Type: Grant
    Filed: February 28, 1983
    Date of Patent: September 11, 1984
    Assignee: Diamond Shamrock Chemicals Company
    Inventor: Stanley A. Lipowski