Temporary wet strength resin for paper applications

Details Temporary wet strength resin for paper applications Temporary wet strength resin for paper applications

2005-09-30

2009-10-27

Woodward, Ana L (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S154000, C525S328200, C525S328300, C525S328400, C525S329400

Reexamination Certificate

active

07608665

ABSTRACT:
A thermosetting resin comprising a reacted A) first partially crosslinked glyoxalated polymer comprising a reacted (i) first polyacrylamide backbone and (ii) a first glyoxal component; and B) a second crosslinked glyoxalated polymer comprising a reacted (i) second polyacrylamide backbone and (ii) a second glyoxyal component; such that the first polyacrylamide backbone has a molecular weight that is less than the molecular weight of the second polyacrylamide backbone; and the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 75:25 to 95:5. Methods for making and using the resin. Fibrous substrates made with the resin.

REFERENCES:
patent: 3556932 (1971-01-01), Coscia et al.
patent: 4603176 (1986-07-01), Bjorkquist et al.
patent: 4605702 (1986-08-01), Guerro et al.
patent: 9802611 (1998-01-01), None
International Search Report; International Application No. PCT/US2006/038218; Date of Mailing: Jan. 17, 2007.
Written Opinion; International Application No. PCT/US2006/038218; Date of Mailing: Jan. 17, 2007.

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