(19) |
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(11) |
EP 0 133 699 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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03.04.1985 Bulletin 1985/14 |
(43) |
Date of publication A2: |
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06.03.1985 Bulletin 1985/10 |
(22) |
Date of filing: 07.08.1984 |
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(84) |
Designated Contracting States: |
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AT BE DE FR GB IT NL SE |
(30) |
Priority: |
16.08.1983 US 523912
|
(71) |
Applicant: AMERICAN CYANAMID COMPANY |
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() |
|
(72) |
Inventors: |
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- Guerro, Gerald Joseph
()
- Proverb, Robert Joseph
()
- Tarvin, Robert Floyd
()
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(54) |
Compositions for imparting temporary wet strength to paper |
(57) A composition for imparting temporary wet strength to paper comprising a solution
containing from about one percent to about ten percent by weight of a vinylamide polymer
having sufficient glyoxal-reactive amide substituents and -CHOHCHO substituents to
be thermosetting, in a solvent selected from the group consisting of water, water-miscible
solvents containing free hydroxyl functionality, and mixtures thereof, to which solution
has been added a sufficient quantity of a strong base for reaction therewith to adjust
the pH of the aqueous solution to a value of from about 8.5 to about 11. Also disclosed
is a process for imparting temporary wet strength to paper by application thereto
of a wet strengtheningly effective amount of such aqueous composition, and the paper
product of such process.