US5115065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric papermaking additive
Assignee: Japan PMC Corp
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Filing: 1988-03-09
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Granted: 1992-05-19
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Expires: 2008-03-09
Abstract
Abstract A papermaking additive useful for papermaking in a neutral to alkaline pH region, which comprises as an active component a water-soluble copolymer comprising as constituent monomers (a) 0.1 to 20 mole % of a specific bisquaternary ammonium (meth)acrylamide, (b) 0 to 20 mole % of a specific acrylamide or acrylic ester derivative such as an aminoalkyl (meth)acrylamide or an aminoalkyl (meth)acrylate, or a salt thereof, (c) 50 to 99.9 mole % of acrylamide and/or methacrylamide, and (d) 0 to 10 mole % of an alpha,beta-unsaturated carboxylic acid and/or a salt thereof. The additive increases paper strength and filler retention and size retention.
Inventors
- 👤 Masatomi Ogawa
- 👤 Mitsuhiro Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:31
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/375
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
195 words
A papermaking additive useful for papermaking in a neutral to alkaline pH region, which comprises as an active component a water-soluble copolymer comprising as constituent monomers (a) 0.1 to 20 mole % of a bisquaternary ammonium (meth)acrylamide represented by the general formula ##STR5## wherein n represents 2, 3 or 4, R 1 represents a hydrogen atom or a methyl group, R 2 to R 6 are identical or different and each represents an alkyl group of 1 to 3 carbon atoms, and X 31 and Y 31 are identical or different and each represents an anion, (b) 0.5 to 2.5 mole % of an acrylamide or acrylic ester derivative represented by the general formula ##STR6## wherein m represents 2, 3 or 4, R 7 represents a hydrogen atom or a methyl group, R 8 or R 9 are identical or different and each represents an alkyl group of 1 to 3 carbon atoms, and A represents NH or an oxygen atom, its salt or mixture thereof, (C) 50 to 99.9 mole % of acrylamide, methacrylamide or mixture thereof, and (d) 1 to 10 mole % of an alpha,beta-unsaturated dicarboxylic acid, its salt or mixture thereof.
Claim 2
Dependent Claim
195 words
A papermaking additive useful for papermaking in a neutral to alkaline pH region, which comprises as an active component a water-soluble copolymer comprising as constituent monomers (a) 0.1 to 20 mole % of a bisquaternary ammonium (meth)acrylamide represented by the general formula ##STR5## wherein n represents 2, 3 or 4, R 1 represents a hydrogen atom or a methyl group, R 2 to R 6 are identical or different and each represents an alkyl group of 1 to 3 carbon atoms, and X 31 and Y 31 are identical or different and each represents an anion, (b) 0.5 to 2.5 mole % of an acrylamide or acrylic ester derivative represented by the general formula ##STR6## wherein m represents 2, 3 or 4, R 7 represents a hydrogen atom or a methyl group, R 8 or R 9 are identical or different and each represents an alkyl group of 1 to 3 carbon atoms, and A represents NH or an oxygen atom, its salt or mixture thereof, (C) 50 to 99.9 mole % of acrylamide, methacrylamide or mixture thereof, and (d) 1 to 10 mole % of an alpha,beta-unsaturated dicarboxylic acid, its salt or mixture thereof.
Claim 3
Dependent Claim
15 words
The papermaking additive of claim 1 wherein component (d) is itaconic acid or maleic acid.
Claim 4
Dependent Claim
42 words
The papermaking additive of claim 1 wherein the copolymer additionally comprises a nonionic monomer selected from the group consisting of styrene, vinyl acetate, acrylonitrile, ethyl acrylate and methyl methacrylate in an amount which does not impair the water-solubility of the resulting copolymer.
Claim 5
Dependent Claim
12 words
The papermaking additive of claim 1 wherein component (b) is an aminoalkyl(meth)acrylamide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |