Claims
- 1. A method to impart oil and grease resistance to paper, which comprises incorporating into the paper an amount of a copolymer ofa) 45-90% by weight of a perfluoroalkyl-substituted (meth)acrylate or (meth)acrylamide, b) 5-30% by weight of a secondary or tertiary amino or quaternary ammonium group-containing (meth)acrylate or (meth)acrylamide, c) 1-20% by weight of vinylidene chloride, and, optionally, d) 0-10% by weight of a copolymerizable nonfluorinated vinyl monomer that is effective to impart oil and grease resistance to the paper.
- 2. A method according to claim 1, wherein the copolymer is applied to dry paper through a coating process in a size-press or by addition of the copolymer to an aqueous pulp.
- 3. A method according to claim 1, wherein 0.02 to 1% by weight of the copolymer is applied, based on the dry weight of the paper or pulp.
- 4. Oil and grease resistant paper or pulp which comprises 0.02 to 1% by weight of a copolymer according, to claim 1.
- 5. A method according to claim 1, wherein the copolymer comprises monomers copolymerized in the following percentages by weight, relative to the total weight of the copolymer:a) 45-90% by weight of a monomer of formula RF—W—X—C(═O)—C(R1)═CH2 (1), wherein RF is a straight or branched-chain perfluoroalkyl group containing 4 to 20 carbon atoms, R1 is H or OH3, X is O, S or N(R2), wherein R2 is H or an alkyl group with 1 to 4 carbon atoms, W is alkylene with 1 to 15 carbon atoms, hydroxyalkylene with 3 to 15 carbon atoms, —(CnH2n)(O CmH2m)q—, —SO2NR2—(CnH2n)— or —CONR2—(CnH2n)—, wherein n is 1 to 12, m is 2 to 4, q is 1 to 10 and R2 is as defined above; b) 5-30% by weight of a monomer of formula (R2)2N—(CH2)k—X1—C(═O)—C(R1)═CH2 (2), in which the nitrogen atom is partially or completely quaternized or in the form of a salt and X1 is O or N(R2) and wherein R1 and R2 are defined as above, each R2 is the same or different, and k is 2 to 4; c) 1-20% by weight of vinylidene chloride, and, optionally, d) 0-10% by weight of a copolymerizable nonfluorinated vinyl monomer.
- 6. A method according to claim 5, wherein the copolymer comprises monomers copolymerized in the following percentages by weight, relative to the total weight of the copolymer:a) 70-85% by weight of a perfluoroalkyl-substituted (meth)acrylate or (meth)acrylamide, b) 3-14% by weight of a secondary or tertiary amino or quaternary ammonium group-containing (meth)acrylate or (meth)acrylamide, c) 5-20% by weight of vinylidene chloride, and, optionally, d) 0-10% by weight of a copolymerizable nonfluorinated vinyl monomer.
- 7. A method according to claim 1, wherein d) is zero.
- 8. A method according to claim 5, wherein RF is a straight chain perfluoroalkyl group with 6-16 carbon atoms, X and X1 are oxygen and W is an alkylene with 1 to 12 carbon atoms.
- 9. A method according to claim 8, wherein R1 is hydrogen and W is —CH2CH2—.
- 10. A method according to claim 5, wherein RF is a straight chain perfluoroalkyl group with 6-16 carbon atoms, X is N(R2), X1 is oxygen and W is —SO2NR2—(CnH2n)—.
- 11. A method according to claim 1, wherein RF comprises a mixture of straight chain perfluoroalkyl groups with 6-16 carbon atoms.
- 12. A method according to claim 5, in which the monomer of the formula (2) is selected from the group consisting of N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl methacrylamide and N-tert butylaminoethyl methacrylate and their salts.
- 13. A method according to claim 5, in which co-monomer (d) is selected from the group consisting of acrylates, methacrylates and styrene.
- 14. A method according to claim 5, in which co-monomer (d) is selected from the group consisting of methyl methacrylate, N-methylol acrylamide, 2-hydroxyethyl methacrylate, acrylic acid, glycidyl methacrylate and acrylonitrile.
Parent Case Info
This application is a divisional of Application No. 09/834,773, filed Apr. 12, 2001, now U.S. Pat. No. 6,566,470, which claims benefit of U.S. Provisional Application No. 60/197,844, filed Apr. 14, 2000.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
9965959 |
Dec 1999 |
WO |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/197844 |
Apr 2000 |
US |