US4681909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rosin emulsion sizing agent
Assignee: Japan PMC Corp
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Filing: 1985-10-22
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Granted: 1987-07-21
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Expires: 2005-10-22
Abstract
Abstract A rosin emulsion sizing agent comprising 20 to 50% by weight of fortified rosin, 2 to 30% by weight of a saponification product of a styrene/acrylic acid copolymer or a styrene/methacrylic acid copolymer, and the remainder being water.
Inventors
- 👤 Koji Ohta
- 👤 Masaaki Yoshimura
- 👤 Mizunori Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:12
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
36 words
A rosin emulsion sizing agent comprising 20 to 50% by weight of fortified rosin, 2 to 30% by weight of an anionic saponification product of a styrene/acrylic acid copolymer or a styrene/methacrylic acid copolymer, and water.
Claim 2
Dependent Claim
36 words
A rosin emulsion sizing agent comprising 20 to 50% by weight of fortified rosin, 2 to 30% by weight of an anionic saponification product of a styrene/acrylic acid copolymer or a styrene/methacrylic acid copolymer, and water.
Claim 3
Dependent Claim
185 words
The sizing agent of claim 1 wherein the styrene/acrylic acid copolymer or styrene/methacrylic acid copolymer is a copolymer composed of 80 to 20% by weight of at least one monomer represented by the general formula ##STR5## wherein R 1 represents H or CH 3 , and R 2 represents H, CH 3 , CH 2 CH 3 , CH(CH 3 ) 2 , or C(CH 3 ) 2 , 20 to 60% by weight of at least one monomer represented by the general formula ##STR6## wherein R 3 represents H, CH 3 or CH 2 COOH, and M represents H, Li, Na, K or NH 4 , and 0 to 40% by weight of at least one monomer represented by the general formula ##STR7## wherein R 4 represents H or CH 3 , and R 5 represents CN, OCOCH 3 , COOCH 3 , COOC 2 H 5 , COOC 3 H 7 , COOC 4 H 9 , COOC 8 H 17 , COOC 12 H 25 , CONH 2 , CONHCH 3 , CON(CH 3 ) 2 or COOCH 2 CH 2 OH.
Claim 4
Dependent Claim
19 words
The sizing agent of claim 1 wherein the saponification product has a degree of saponification of 40 to 100%.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |