US4030970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface sizing of paper with an acrylic copolymer where scum formation is minimized
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1974-05-30
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Granted: 1977-06-21
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Expires: 1994-05-30
Abstract
Abstract A process for surface sizing paper with a surface sizing composition, which comprises a copolymer of acrylic or methacrylic ester, alkali metal salts of acrylic or methacrylic acid, and acrylic or methacrylic acid, or ammonium or lower alkyl amine salts thereof, where substantially no scum forms in the press operation, even after 8 hours.
Inventors
- 👤 Yoichi Tominaga
- 👤 Yasuo Shibahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:01
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
166 words
A process for surface-sizing paper which comprises applying to the surface of the paper a surface sizing composition for paper which forms substantially no scum in a surface sizing press operation even after 8 hours, which composition comprises a copolymer having copolymerized acrylic or methacrylic ester units (A) of the formula (1): ##STR4## wherein R 1 is H or methyl, and R is a hydrocarbon radical having 1-18 carbon atoms, copolymerized acrylic or methacrylic acid alkali metal salt units (B) of the formula (2): ##STR5## wherein R 2 is H or methyl and M 1 is an alkali metal and copolymerized acrylic or methacrylic acid salt units or acid units (C) of the formula (3): ##STR6## wherein R 3 is H or methyl, and M 2 is ammonium or a combination of ammonium with a lower alkyl amine cation and/or H, wherein said copolymer has a carboxylic equivalent of 90-500 in the free carboxylic form and a molar ratio of units (B) to (C) of 5-50:95-50.
Claim 2
Dependent Claim
166 words
A process for surface-sizing paper which comprises applying to the surface of the paper a surface sizing composition for paper which forms substantially no scum in a surface sizing press operation even after 8 hours, which composition comprises a copolymer having copolymerized acrylic or methacrylic ester units (A) of the formula (1): ##STR4## wherein R 1 is H or methyl, and R is a hydrocarbon radical having 1-18 carbon atoms, copolymerized acrylic or methacrylic acid alkali metal salt units (B) of the formula (2): ##STR5## wherein R 2 is H or methyl and M 1 is an alkali metal and copolymerized acrylic or methacrylic acid salt units or acid units (C) of the formula (3): ##STR6## wherein R 3 is H or methyl, and M 2 is ammonium or a combination of ammonium with a lower alkyl amine cation and/or H, wherein said copolymer has a carboxylic equivalent of 90-500 in the free carboxylic form and a molar ratio of units (B) to (C) of 5-50:95-50.
Claim 3
Dependent Claim
13 words
The process of claim 1, wherein the carboxylic equivalent is 100 - 200.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein the molar ratio of unit (B) to (C) is 10-25:90-75.
Claim 5
Dependent Claim
13 words
The process of claim 1, wherein the alkali metal is sodium or potassium.
Claim 6
Dependent Claim
34 words
The process of claim 1, wherein the lower alkyl amine is selected from the group consisting of monoalkyl amines, dialkylamines, trialkylamines which have 1-3 carbon atoms in each alkyl groups, monoethanolamine, diethanolamine and triethanolamine.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein M 1 is sodium or potassium and M 2 is ammonium or a combination of ammonium and hydrogen.
Claim 8
Dependent Claim
18 words
The process of claim 1, wherein the copolymer has an additional structural unit of an ethylenically unsaturated monomer.
Claim 9
Dependent Claim
30 words
The process of claim 7, wherein the ethylenically unsaturated monomer is selected from the group consisting of styrene, vinyl acetate, vinyl chloride, maleic acid, maleic acid esters and hydroxyethyl acrylate.
Claim 10
Dependent Claim
10 words
The process of claim 1, wherein M 2 is ammonium.
Claim 11
Dependent Claim
21 words
The process of claim 1, wherein M 2 is a combination of ammonium with a lower alkyl amine cation and/or H.
Claim 12
Dependent Claim
29 words
The process of claim 1, wherein M 2 is a combination of a major proportion of ammonium with a minor proportion of a lower alkyl amine cation and/or H.
Claim 13
Dependent Claim
37 words
The process of claim 1, wherein the surface sizing composition comprises the copolymer and a modifier which is a modified starch, a polyvinyl alcohol, a sodium alginate, a carboxy methyl cellulose, a rosin or a petroleum resin.
Claim 14
Dependent Claim
165 words
A process for surface-sizing paper which comprises applying to the paper in a size press a surface sizing composition for paper which forms substantially no scum in the press operation even after 8 hours, which composition comprises a copolymer having copolymerized acrylic or methacrylic ester units (A) of the formula (1): ##STR7## wherein R 1 is H or methyl, and R is a hydrocarbon radical having 1-18 carbon atoms, copolymerized acrylic or methacrylic acid alkali metal salt units (B) of the formula (2): ##STR8## wherein R 2 is H or methyl and M 1 is an alkali metal and copolymerized acrylic or methacrylic acid salt units or acid units (C) of the formula (3): ##STR9## wherein R 3 is H or methyl, and M 2 is ammonium, or a combination of ammonium with a lower alkyl amine cation and/or H, wherein said copolymer has a carboxylic equivalent of 90-500 in the free carboxylic form and a molar ratio of units (B) to (C) of 5-50:95-50.
Claim 15
Dependent Claim
165 words
A process for surface-sizing paper which comprises applying to the paper in a size press a surface sizing composition for paper which forms substantially no scum in the press operation even after 8 hours, which composition comprises a copolymer having copolymerized acrylic or methacrylic ester units (A) of the formula (1): ##STR7## wherein R 1 is H or methyl, and R is a hydrocarbon radical having 1-18 carbon atoms, copolymerized acrylic or methacrylic acid alkali metal salt units (B) of the formula (2): ##STR8## wherein R 2 is H or methyl and M 1 is an alkali metal and copolymerized acrylic or methacrylic acid salt units or acid units (C) of the formula (3): ##STR9## wherein R 3 is H or methyl, and M 2 is ammonium, or a combination of ammonium with a lower alkyl amine cation and/or H, wherein said copolymer has a carboxylic equivalent of 90-500 in the free carboxylic form and a molar ratio of units (B) to (C) of 5-50:95-50.
Claim 16
Dependent Claim
35 words
The process of claim 13, wherein the composition comprises the copolymer and a modifier which is a modified starch, a polyvinyl alcohol, a sodium alginate, a carboxy methyl cellulose, a rosin or a petroleum resin.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |