Patent US4072624A successfully refreshed from Google Patents.
US4072624A
Expired / Lapsed
US
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Gelatin composition
Assignee: Leiner P and Sons Encapsulations Ltd
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Filing: 1976-10-18
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Granted: 1978-02-07
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Expires: 1996-10-18
Abstract
Abstract The invention provides a compound obtained by chemically reacting a gelatin-compatible polymer having a multiplicity of functional groups with an optical brightening agent having only a single functional group reactive with the said functional groups of the polymer. The resulting compound can be mixed with gelatin to give a gelling system for the formation of gels, e.g. coating films, which are resistant to washing or leaching out of the optical brightening agent, thus overcoming the problem of the lack of substantivity of the agent in systems involving a simple mixture of gelatin with optical brightening agent.
Inventors
- 👤 Ronald J. Croome
- 👤 Donald B. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:05
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155; Y; Y10; Y10S; Y10S430/00; Y10S430/134
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
52 words
The product of the chemical reaction of a synthetic polymer having a multiplicity of primary amino groups with an optical brightening agent having a single functional group per molecule for reaction with the said primary amino groups of the polymer, said product being capable of forming a homogeneous aqueous solution with gelatin.
Claim 2
Dependent Claim
52 words
The product of the chemical reaction of a synthetic polymer having a multiplicity of primary amino groups with an optical brightening agent having a single functional group per molecule for reaction with the said primary amino groups of the polymer, said product being capable of forming a homogeneous aqueous solution with gelatin.
Claim 3
Dependent Claim
42 words
A reaction product according to claim 1 wherein the optical brightening agent has the formula ##STR3## wherein R 4 is the said single functional group and R 1 , R 2 and R 3 are each substituents non reactive to said polymer.
Claim 4
Dependent Claim
24 words
A reaction product according to claim 2 wherein R 1 and R 3 are morphalino, R 2 is diethanolamino, and R 4 is chloro.
Claim 5
Dependent Claim
13 words
A reaction product according to claim 3 wherein the synthetic polymer is polyethyleneimine.
Claim 6
Dependent Claim
13 words
A reaction product according to claim 1 wherein the synthetic polymer is polyethyleneimine.
Claim 7
Dependent Claim
23 words
A reaction product according to claim 1 containing up to 100 wt. % of said optical brightening agent based on the synthetic polymer.
Claim 8
Dependent Claim
24 words
A reaction product according to claim 6 containing from 50 to 100 wt. % of said optical brightening agent based on the synthetic polymer.
Claim 9
Dependent Claim
12 words
A composition comprising gelatin and a reaction product according to claim 1.
Claim 10
Dependent Claim
19 words
A composition according to claim 8 containing 5 wt. % of said optical brightening agent based on the gelatin.
Claim 11
Dependent Claim
14 words
A homogeneous aqueous solution of gelatin and a reaction product according to claim 1.
Claim 12
Dependent Claim
12 words
A homogeneous dried film cast from a solution according to claim 10.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |