US4444939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochromic paint
Assignee: Novartis AG
•
Filing: 1983-03-02
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Granted: 1984-04-24
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Expires: 2003-03-02
Abstract
Abstract Photochromic paint comprising a latex of an acrylate and/or a methacrylate polymer, the polymer particles of which constitutes 30 to 50% by weight of the latex and which has been prepared using a copolymerizable surfactant, there being dispersed in the latex photochromic glass beads of from 0.05 to 1.00 μm in size and which comprises from 10 to 30% by weight of the latex, the total solids content of the latex being from 40 to 60% by weight. The paint may be coated on to any surface which will accept a water-based paint.
Inventors
- 👤 Stephen R. Postle
- 👤 Samuel B. Kingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:23
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/29; C09D133/00; C09D133/04; C09D133/06; C09D133/062; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
Photochromic paint which comprises a latex of an acrylate and/or a methacrylate polymer, the polymer particles of which constitute 30 to 50% by weight of the latex and which has been prepared using a copolymerisable alkali metal salt of a vinyl or styryl sulphonate there being dispersed in the latex photochromic glass beads of from 0.05 to 1.00 u m in size and which comprises from 10 to 30% by weight of the latex, the total solids content of the latex being 40 to 60% by weight.
Claim 2
Dependent Claim
87 words
Photochromic paint which comprises a latex of an acrylate and/or a methacrylate polymer, the polymer particles of which constitute 30 to 50% by weight of the latex and which has been prepared using a copolymerisable alkali metal salt of a vinyl or styryl sulphonate there being dispersed in the latex photochromic glass beads of from 0.05 to 1.00 u m in size and which comprises from 10 to 30% by weight of the latex, the total solids content of the latex being 40 to 60% by weight.
Claim 3
Dependent Claim
20 words
Photochromic paint according to claim 1, wherein the total solids content of the latex is 45 to 55% by weight.
Claim 4
Dependent Claim
21 words
Photochromic paint according to claim 1, wherein the ratio of polymer particles to photochromic glass beads is from 3:1 to 2:1.
Claim 5
Dependent Claim
34 words
Photochromic paint according to claim 1, wherein the polymer of the latex is a copolymer which comprises 20 to 40% by weight of an alkyl acrylate and 60 to 80% by weight of styrene.
Claim 6
Dependent Claim
31 words
Photochromic paint according to claim 1, where from 1 to 5% by weight of the latex polymer is derived from the copolymerisable alkali metal salt of a vinyl or styryl sulphonate.
Claim 7
Dependent Claim
18 words
Photochromic paint according to claim 1, which also comprises glycol ethers, tricresyl phosphate, dibutyl phthalate and hydroxyalkyl isobutyrates.
Claim 8
Dependent Claim
11 words
An article paint with the photochromic paint according to claim 1.
References Cited (Backward Citations)
GB1227201A
Cited
GB1213543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |