Patent US4812486A successfully refreshed from Google Patents.
US4812486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent resin with excellent stability
Assignee: Kao Corp
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Filing: 1987-08-18
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Granted: 1989-03-14
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Expires: 2007-08-18
Abstract
Abstract An absorbent composition having excellent stability comprising an absorbent resin and 0.01 to 30 percent by weight, based on the dried weight of said absorbent resin, of a radical chain terminator.
Inventors
- 👤 Yasunori Hosokawa
- 👤 Takatoshi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
C; C08; C08L; C08L101/00; B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08K; C08K5/00; C08K5/0008
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
An absorbent composition having excellent stability comprising an absorbent resin and 0.01 to 30 percent by weight, based on the dried weight of said absorbent resin, of a radical chain terminator.
Claim 2
Dependent Claim
31 words
An absorbent composition having excellent stability comprising an absorbent resin and 0.01 to 30 percent by weight, based on the dried weight of said absorbent resin, of a radical chain terminator.
Claim 3
Dependent Claim
31 words
The composition as claimed in claim 1, in which said radical chain terminator is soluble in an amount of 0.1 gram or larger in 100 grams of water at 25° C.
Claim 4
Dependent Claim
22 words
The composition as claimed in claim 1, in which said absorbent resin is a crosslinked product of a salt of polyacrylic acid.
Claim 5
Dependent Claim
44 words
The composition as claimed in claim 1, in which said absorbent resin is a hydrolyzate of starch-acrylonitrile polymer, a starch-acrylic acid graft polymer, a hydrolyzate of vinyl acetate-acrylate copolymer, crosslinking product of polyacrylic acid salt, a crosslinking product of isobutylene-maleic anhydride copolymer and carboxymethylcellulose.
Claim 6
Dependent Claim
34 words
The composition as claimed in claim 1, in which said radical chain terminator is hydroquinone, p-methoxyphenol, benzoquinone, methyl hydroquinone, t-butylhydroquinone, pyrogallol, gallic acid, methyl gallate, ethyl gallate, propyl gallate, tannic acid or salts thereof.
Claim 7
Dependent Claim
12 words
The composition as claimed in claim 1, comprising a metal chelating agent.
Claim 8
Dependent Claim
19 words
The composition as claimed in claim 6, in which the metal chelating agent is phosphoric acid or citric acid.
Claim 9
Dependent Claim
12 words
The composition as claimed in claim 1, comprising a chain transfer agent.
Claim 10
Dependent Claim
22 words
The composition of claim 8, in which the chain transfer agent is a mercaptan, a lower aliphatic alcohol or a carboxylic acid.
References Cited (Backward Citations)
US4664857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |