Patent US4650819A successfully refreshed from Google Patents.
US4650819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating composition
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-08-16
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Granted: 1987-03-17
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Expires: 2005-08-16
Abstract
Abstract A coating composition, which is excellent in abrasion resistance, comprises spherical alpha -alumina particles, a binder and a solvent, in which said spherical alpha -alumina particles are contained in an amount of from 35 to 85% by weight of the solid content in the coating composition.
Inventors
- 👤 Hideo Nakamoto
- 👤 Tsutomu Okaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:50
CPC Classifications
C; C09; C09D; C09D7/00; C09D7/40; C09D7/66; C09D7/69; C09D7/60; C09D7/61; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K7/00; C08K7/16; C08K7/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
A coating composition excellent in abrasion resistance comprising spherical α-alumina particles, a binder selected from the group consisting of a bisphenol A epoxy resin having an epoxy equivalent of 450 or more and an acrylic resin having a glass transition temperature of 30° C. or higher and a hydroxyl value of from 20 to 120, a curing agent and a solvent, in which said spherical α-alumina particles are contained in an amount of from 35 to 85% by weight of the solid content in the coating composition.
Claim 2
Dependent Claim
87 words
A coating composition excellent in abrasion resistance comprising spherical α-alumina particles, a binder selected from the group consisting of a bisphenol A epoxy resin having an epoxy equivalent of 450 or more and an acrylic resin having a glass transition temperature of 30° C. or higher and a hydroxyl value of from 20 to 120, a curing agent and a solvent, in which said spherical α-alumina particles are contained in an amount of from 35 to 85% by weight of the solid content in the coating composition.
Claim 3
Dependent Claim
34 words
The coating composition excellent in the abrasion resistance as defined in claim 1, wherein the binder comprises a bisphenol A epoxy resin having an epoxy equivalent of 450 or more and a curing agent.
Claim 4
Dependent Claim
20 words
The coating composition excellent in abrasion resistance as defined in claim 2, wherein the curing agent is a polyisocyanate compound.
Claim 5
Dependent Claim
20 words
The coating composition excellent in abrasion resistance as defined in claim 2, wherein the curing agent is an amino resin.
Claim 6
Dependent Claim
42 words
The coating composition excellent in abrasion resistance as defined in claim 1, wherein the binder comprises an acrylic resin having a glass transition temperature of 30° C. or higher and a hydroxyl value of from 20 to 120 and a curing agent.
Claim 7
Dependent Claim
21 words
The coating composition excellent in the abrasion resistance as defined in claim 5, wherein the curing agent is a polyisocyanate compound.
Claim 8
Dependent Claim
21 words
The coating composition excellent in the abrasion resistance as defined in claim 5, wherein the curing agent is an amino resin.
Claim 9
Dependent Claim
41 words
The coating composition excellent in the abrasion resistance as defined in claim 1, wherein the binder comprises a thermoplastic acrylic resin having a glass transition temperature of 40° C. or higher and a weight average molecular weight of 30,000 or greater.
Claim 10
Dependent Claim
32 words
The coating composition excellent in the abrasion resistance as defined in claim 1, wherein the average particle size of the spherical α-alumina particles lies within a range between 5 and 50 μm.
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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |