Temporary wet strength resins and paper products containing same
AssigneeThe Procter & Gamble Company
InventorDavid W. Bjorkquist
Life of this patent
Estimating the term…
Abstract
Provided for use in paper products are temporary wet strength resins having a molecular weight of from about 40,000 to about 400,000, most preferably from about 120,000 to about 210,000, having the formula: ##STR1## wherein: A is ##STR2## and X is --O--, --NH--, or --NCH.sub.3 --, and R is a substituted or unsubstituted aliphatic group; Y.sub.1 and Y.sub.2 are independently --H, --CH.sub.3, or a halogen; W is a nonucleophilic, aliphatic amide; Q is a cationic monomer unit. The mole percent of "a" ranges from about 1% to about 70%; the mole percent of "b" ranges from about 10% to about 90%; and the mole percent of "c" ranges from about 1% to about 40%.
Claims20
A paper product comprising a sheet of fibrous materials and from about 0.005% to about 5.0% by weight of said fibrous materials of a temporary wet strength resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula:
- ##STR15## wherein:
- A is ##STR16## and X is --O--, --NH--, or --NCH.sub.3 --, and R is an unsubstituted group;
- Y.sub.1 and Y.sub.2 are independently --H, --CH.sub.3 or a halogen;
- W is a nonnucleophilic, aliphatic amide;
- Q is a cationic monomeric unit;
- the mole percent of a is from about 1% to about 70%;
- the mole percent of b is from about 10% to about 90%;
- and the mole percent of c is from about 1% to about 40%;
- said resin having an average molecular weight of between about 40,000 and about 400,000.
A paper product comprising a sheet of cellulosic fibrous material and from about 0.005% to about 5.0% by weight of said cellulosic fibrous material of a temporary wet strength resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula:
- ##STR22## wherein:
- A is ##STR23## and X is --O--, --NH--, or --NCH.sub.3 --, and R is an unsubstituted aliphatic group;
- Y.sub.1 and Y.sub.2 are independently --H, --CH.sub.3 or a halogen;
- W is a nonnucleophilic, aliphatic amide;
- Q is a cationic monomeric unit;
- the mole percent of a is from about 1% to about 70%;
- the mole percent of b is from about 10% to about 90%;
- and the mole percent of c is from about 1% to about 40%;
- said resin having an average, molecular weight of between about 40,000 and about 400,000, said paper product having an initial wet tensile strength/dry tensile strength ratio of at least about 10% and a wet tensile decay rate after 90 minutes soaking in neutral pH water of at least about 70%.
A paper product comprising a sheet of cellulosic fibrous material and from about 0.005% to about 5.0% by weight of said cellulosic fibrous material of a temporary wet strength resin comprising a polymer characterized by the substantially complete absence of nucleophilic functionalities and having the formula:
- ##STR27## wherein:
- A is ##STR28## and X is --O--, --NH--, or --NCH.sub.3 --, and R is an unsubstituted aliphatic group;
- Y.sub.1 and Y.sub.2 are independently --H, --CH.sub.3 or a halogen;
- W is a nonnucleophilic, aliphatic amide;
- Q us a cationic monomeric unit;
- the mole percent of a is from about 1% to about 70%;
- the mole percent of b is from about 10% to about 90%;
- and the mole percent of c is from about 1% to about 40%;
- said resin having an average, molecular weight of between about 40,000 and about 400,000, said paper product having an initial wet tensile strength/dry tensile strength ratio of at least about 12% and a wet tensile decay rate after 90 minutes soaking in neutral pH water of at least about 80%.
Dependencies are inferred from the claim text.