US3925328A
Expired / Lapsed
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Surface sizing compositions
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1973-11-02
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Granted: 1975-12-09
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Expires: 1993-11-02
Abstract
Abstract A surface sizing composition for paper which comprises a copolymer of styrene and at least one unsaturated carboxylic compound selected from the group consisting of maleic acid, maleic anhydride and half-esters of maleic acid, wherein the copolymer has a carboxylate equivalent of 80 - 300 based on the free carboxylic acid form, and wherein the copolymer has 5 - 50% of its total carboxylic groups as alkali metal salts and 95 - 50% of its total carboxylic groups as at least one non-metal salt selected from the group consisting of ammonium salts and lower alkyl amine salts.
Inventors
- 👤 Yasuo Shibahara
- 👤 Yoichi Tominaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; C; C08; C08L; C08L35/00; C09; C09J; C09J135/00; C09J135/06; D21H17/33; D21H17/34; D21H17/35; D21H17/36; D21H17/41; D21H17/42; D21H17/43
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
A SURFACE SIZING COMPOSITION FOR PAPER, WHICH COMPRISES: A COPOLYMER OF STYRENE AND AT LEAST ONE UNSATURATED CARBOXYLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID, MALEIC ANHYDRIDE AND HALF ESTERS OF MALEIC ACID, WHEREIN SAID COPOLYMER HAS A CARBOXYLATE EQUIVALENT OF 80 - 300 BASED ON THE FREE CARBOXYLIC ACID FORM, AND WHEREIN SAID COPOLYMER HAS 5 - 50% OF ITS TOTAL CARBOXYLIC GROUPS AS ALKALI METAL SALTS AND 95 - 50% OF ITS TOTAL CARBOXYLIC GROUPS AS AT LEAST ONE NONMETAL SALT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SALTS AND LOWER ALKYL AMINE SALTS.
Claim 2
Dependent Claim
98 words
A SURFACE SIZING COMPOSITION FOR PAPER, WHICH COMPRISES: A COPOLYMER OF STYRENE AND AT LEAST ONE UNSATURATED CARBOXYLIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID, MALEIC ANHYDRIDE AND HALF ESTERS OF MALEIC ACID, WHEREIN SAID COPOLYMER HAS A CARBOXYLATE EQUIVALENT OF 80 - 300 BASED ON THE FREE CARBOXYLIC ACID FORM, AND WHEREIN SAID COPOLYMER HAS 5 - 50% OF ITS TOTAL CARBOXYLIC GROUPS AS ALKALI METAL SALTS AND 95 - 50% OF ITS TOTAL CARBOXYLIC GROUPS AS AT LEAST ONE NONMETAL SALT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM SALTS AND LOWER ALKYL AMINE SALTS.
Claim 3
Dependent Claim
25 words
The surface sizing composition of claim 1, wherein the molar ratio of styrene to the unsaturated carboxylic compound is 30 -90 : 70 - 10.
Claim 4
Dependent Claim
19 words
The surface sizing composition of claim 2, wherein said molar ratio is 45 - 60 : 55 - 40.
Claim 5
Dependent Claim
15 words
The surface sizing composition of claim 1, wherein the carboxylate equivalent is 100 - 240.
Claim 6
Dependent Claim
36 words
The surface sizing composition of claim 1, wherein said copolymer has 10 - 25% of its total carboxylic groups as alkali metal salts and 90 - 75% of its total carboxylic groups as a non-metal salt.
Claim 7
Dependent Claim
28 words
The surface sizing composition of claim 1, wherein said half-esters of maleic acid are half-esters of maleic acid with monohydric aliphatic alcohols containing 1 - 20 carbon atoms.
Claim 8
Dependent Claim
19 words
The surface sizing composition of claim 1, wherein said alkali metal salt is the sodium salt or potassium salt.
Claim 9
Dependent Claim
15 words
The surface sizing composition of claim 1, wherein sad non-metal salt is an ammonium salt.
Claim 10
Dependent Claim
31 words
The surface sizing composition of claim 1, wherein the lower alkyl ammonium salts are monoalkyl amines, dialkylamines or trialkyl amines which have 1 - 3 carbon atoms in each alkyl group.
Claim 11
Dependent Claim
21 words
The surface sizing composition of claim 1, wherein the copolymer has an additional structural unit derived from an ethylenically unsaturated monomer.
Claim 12
Dependent Claim
23 words
The surface sizing composition of claim 10, wherein the ethylenically unsaturated monomer is an acrylate or methacrylate having 4 - 12 carbon atoms.
Claim 13
Dependent Claim
25 words
The surface sizing composition of claim 1, wherein the free carboxylic acid content of the copolymer is less than 45% of the total carboxylic groups.
Claim 14
Dependent Claim
12 words
The surface sizing composition of claim 1, which further comprises a modifier.
Claim 15
Dependent Claim
22 words
The surface sizing composition of claim 13, wherein said modifier is a starch, a polyvinyl alcohol, 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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |