US4626472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free-flowing flakes of hydrophilic/water-soluble polymer gel
Assignee: Rhone Poulenc Specialites Chimiques
•
Filing: 1985-08-12
•
Granted: 1986-12-02
•
Expires: 2005-08-12
Abstract
Abstract Storage-stable, discrete free-flowing flakes of a hydrophilic or water-soluble polymer gel, such flakes comprising a thin adherent film coating of a processing aid powder, are facilely produced by comminuting a larger shaped article of said polymer gel, e.g., a block, sheet, strip or layer thereof, in the presence of said processing aid powder, and said powder being present during comminution in an amount in excess of that required for otherwise complete coating of the flakes which result.
Inventors
- 👤 Jean Boutin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:51
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08J2333/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
Storage-stable, discrete, non-adherent and free-flowing burst grains or flakes of a hydrophilic or water-soluble polymer gel, said burst grains or flakes comprising a complete thin adherent film coating of a processing aid powder, and said powder being inert with respect to the polymer and either water absorbent or adapted to prevent dehydration of the polymer gel.
Claim 2
Dependent Claim
56 words
Storage-stable, discrete, non-adherent and free-flowing burst grains or flakes of a hydrophilic or water-soluble polymer gel, said burst grains or flakes comprising a complete thin adherent film coating of a processing aid powder, and said powder being inert with respect to the polymer and either water absorbent or adapted to prevent dehydration of the polymer gel.
Claim 3
Dependent Claim
34 words
The free-flowing flakes as defined by claim 1, having an average particle size ranging from about 0.3 to 8 mm, and the thin film coating comprising from 1 to 20% of the weight thereof.
Claim 4
Dependent Claim
16 words
The free-flowing flakes as defined by claim 2, said polymer gel comprising a hydrophilic acrylic polymer.
Claim 5
Dependent Claim
16 words
The free-flowing flakes as defined by claim 2, said polymer gel comprising a water-soluble acrylic polymer.
Claim 6
Dependent Claim
24 words
The free-flowing flakes as defined by claim 2, from 70 to 90% by weight thereof having particle sizes ranging from 1 to 4 mm.
References Cited (Backward Citations)
US3334070A
Cited
US4438179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-01 | 1990-06-02 | 1990-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-01 | 1994-06-02 | 1994-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-01 | 1998-06-02 | 1998-12-02 | $7700.00 | Window Closed / Lapsed |