Patent US2915645A successfully refreshed from Google Patents.
Patent US3666732A successfully refreshed from Google Patents.
US3666732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylenically unsaturated derivatives of 4-aminobenzoic acid and polymers prepared therefrom
Assignee: Indopco Inc
•
Filing: 1970-08-17
•
Granted: 1972-05-30
•
Expires: 1990-08-17
Abstract
Abstract Ethylenically unsaturated derivatives of 4-aminobenzoic acid are prepared by a novel method involving the reaction under controlled conditions of 4-aminobenzoic acid and various derivatives thereof with allyl chloride. The resulting monomers may, thereafter, be copolymerized with a wide variety of conventional ethylenically unsaturated, i.e., vinyl, monomers. The monomeric derivatives as well as the copolymers prepared therefrom are ultra-violet absorbers in the 280-320 millimicrons range and find a particular utility as a sun-screen agent in suntan formulations.
Inventors
- 👤 Martin Skoultchi
- 👤 Eric A Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:11
CPC Classifications
A; A61; A61Q; A61Q17/00; A61Q17/04; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/40; A61K8/44; A61K8/445; A61K8/72; A61K8/81; A61K8/817; A61K2800/00; A61K2800/40; A61K2800/57
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A composition of matter characterized by its ultra-violet absorbance at 280-320 millimicrons comprising a copolymer of an ethylenically unsaturated derivative of 4-aminobenzoic acid corresponding to the formula: wherein R is a radical selected from a group consisting of hydrogen, lower alkyl and aryl radicals; and R'' is a radical selected from the group consisting of hydrogen, lower alkyl and lower hydroxyalkyl radicals; with at least one ethylenically unsaturated comonomer selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, crotonic acid, the alkyl esters of acrylic and methacrylic acids, the hydroxyalkyl esters of acrylic and methacrylic acids, acrylamide, acrylonitrile, methacrylonitrile, styrene, Alpha -methyl styrene, isoprene, butadiene, ethylene, propylene, the C1 - C4 alkyl mono- and diesters of maleic and fumaric acids, vinyl acetate, vinyl propionate, vinyl chloride, vinyl fluoride, vinylidene chloride, and N-vinyl pyrrolidone.
Claim 2
Dependent Claim
26 words
The composition of claim 2, wherein said ethylenically unsaturated derivative of 4-aminobenzoic acid is present in a proportion of at least about 1 percent, by weight.
Claim 3
Dependent Claim
13 words
The composition of claim 2, comprising hydroxypropyl acrylate: methyl acrylate:acrylic acid:4-(N,N-diallyl-amino) benzoic acid.
Claim 4
Dependent Claim
13 words
The composition of claim 2, comprising hydroxyethyl acrylate: acrylic acid: ethyl 4-(N,N-diallylamino) benzoate.
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |