US5132045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acrylic phosphor paste compositions and phosphor coatings obtained therefrom
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-03-15
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Granted: 1992-07-21
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Expires: 2009-03-15
Abstract
Abstract A phosphor paste composition is disclosed, which uses as an organic binder an acrylic polymer obtained by copolymerizing an alkyl methacrylate as a principal component with a specific amount of at least one monomer selected from unsaturated carboxylic acids and hydroxyalkyl (meth)acrylates. Also disclosed is a phosphor paste composition making use of a phosphor having a volume average particle size in a range of 1-7 μm, with particles having a particle size of 1-9 μm accounting for at least 60 wt. %. These phosphor paste compositions have excellent firing characteristics and provide phosphor coatings excellent in both light-emitting characteristics and resolution.
Inventors
- 👤 Norihisa Osaka
- 👤 Yukihiro Ikegami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/70; C09K11/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A phosphor paste composition comprising: (A) 100 parts by weight of an acrylic polymer obtained by copolymerizing (a) 52-99.9 wt. % of an alkyl methacrylate, (b) at least 0.1 wt. % of at least one monomer selected from unsaturated carboxylic acids and hydroxyalkyl (meth)acrylates with the proviso that the total proportion of the one or more unsaturated carboxylic acids is not greater than 8 wt. % and that the total proportion of the one or more hydroxylalkyl (meth)acrylates is not greater than 40 wt. %, and (c) 0-20 wt. % of another vinyl monomer copolymerizable with the above monomers; (B) 250-2,000 parts by weight of a phosphor; and (C) an organic solvent having a boiling point of at least 150° C.; said composition having a viscosity of 5,000-200,000 cps at 25° C.
Claim 2
Dependent Claim
132 words
A phosphor paste composition comprising: (A) 100 parts by weight of an acrylic polymer obtained by copolymerizing (a) 52-99.9 wt. % of an alkyl methacrylate, (b) at least 0.1 wt. % of at least one monomer selected from unsaturated carboxylic acids and hydroxyalkyl (meth)acrylates with the proviso that the total proportion of the one or more unsaturated carboxylic acids is not greater than 8 wt. % and that the total proportion of the one or more hydroxylalkyl (meth)acrylates is not greater than 40 wt. %, and (c) 0-20 wt. % of another vinyl monomer copolymerizable with the above monomers; (B) 250-2,000 parts by weight of a phosphor; and (C) an organic solvent having a boiling point of at least 150° C.; said composition having a viscosity of 5,000-200,000 cps at 25° C.
Claim 3
Dependent Claim
50 words
The phosphor paste composition of claim 1, wherein said phosphor is a phosphor with a layer of an activator and said phosphor has a volume average particle size in a range of 1-7 μm, with particles having a particle size of 1-9 μm accounting for at least 60 weight %.
Claim 4
Dependent Claim
25 words
The phosphor paste composition as claimed in claim 2, wherein the phosphor is a monochrome phosphor having a volume average particle size of 1-4 μm.
Claim 5
Dependent Claim
25 words
The phosphor paste composition as claimed in claim 2, wherein the phosphor is a color phosphor having a volume average particle size of 2-7 μm.
Claim 6
Dependent Claim
148 words
A phosphor coating formed by printing a pattern with a phosphor paste composition, comprising: (A) 100 parts by weight of an acrylic polymer obtained by copolymerizing (a) 52-99.9 wt. % of an alkyl methacrylate, (b) at least 0.1 wt. % of at least one monomer selected from unsaturated carboxylic acids and hydroxyalkyl (meth)acrylates with the proviso that the total proportion of the one or more unsaturated carboxylic acids is not greater than 8 wt. % and that the total proportion of the one or more hydroxylalkyl (meth)acrylates is not greater than 40 wt. %, and (c) 0-20 wt. % of another vinyl monomer copolymerizable with the above monomers; (B) 250-2,000 parts by weight of a phosphor; and (C) an organic solvent having a boiling point of at least 150° C.; said composition having a viscosity of 5,000-200,000 cps at 25° C., and then firing the phosphor paste composition.
Claim 7
Dependent Claim
148 words
A phosphor coating formed by printing a pattern with a phosphor paste composition, comprising: (A) 100 parts by weight of an acrylic polymer obtained by copolymerizing (a) 52-99.9 wt. % of an alkyl methacrylate, (b) at least 0.1 wt. % of at least one monomer selected from unsaturated carboxylic acids and hydroxyalkyl (meth)acrylates with the proviso that the total proportion of the one or more unsaturated carboxylic acids is not greater than 8 wt. % and that the total proportion of the one or more hydroxylalkyl (meth)acrylates is not greater than 40 wt. %, and (c) 0-20 wt. % of another vinyl monomer copolymerizable with the above monomers; (B) 250-2,000 parts by weight of a phosphor; and (C) an organic solvent having a boiling point of at least 150° C.; said composition having a viscosity of 5,000-200,000 cps at 25° C., and then firing the phosphor paste composition.
Claim 8
Dependent Claim
24 words
The phosphor coating as claimed in claim 5, wherein the phosphor is a monochrome phosphor having a volume average particle size of 1-4 μm.
Claim 9
Dependent Claim
24 words
The phosphor coating as claimed in claim 5, wherein the phosphor is a color phosphor having a volume average particle size of 2-7 μm.
References Cited (Backward Citations)
US3459672A
Cited
US3839068A
Cited
US3744877A
Cited
US3886394A
Cited
US4079258A
Cited
US4049845A
Cited
US4142987A
Cited
JPS5376184A
Cited
JPS53125984A
Cited
US4188449A
Cited
US4206250A
Cited
US4382979A
Cited
JPS5593631A
Cited
US4443380A
Cited
US4572803A
Cited
JPS6464784A
Cited
US5076963A
Cited
JPH03135480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |