Patent US3301220A successfully refreshed from Google Patents.
Patent US4256805A successfully refreshed from Google Patents.
US4256805A
Expired / Lapsed
US
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Powdery coating composition and process for preparing the same
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1979-08-07
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Granted: 1981-03-17
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Expires: 1999-08-07
Abstract
Abstract A powdery coating composition having excellent anti-caking ability, which comprises polymer particles having an average particle size of 0.5 to 200 mu composed of a polymer having a softening point not exceeding 90 DEG C. as a core component and a polymer having a softening point of at least 100 DEG C. as an outer component covering said core component, and to a process for the preparation of such powdery coating composition.
Inventors
- 👤 Hideyoshi Tugukuni
- 👤 Masafumi Kano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:50
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/006; C08F265/00; C08F265/04; C09; C09D; C09D5/00; C09D5/03; C09D5/031; Y; Y10; Y10S; Y10S524/00; Y10S524/904; Y10S525/00; Y10S525/902; Y10S525/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
A powdery coating composition comprising polymer particles having an average particle size within the range of 0.5 to 200μ, said particles consisting of, as a core component, a powdery polymer having a softening point from 20° to 90° C. and selected from the group consisting of acrylic copolymers containing 5 to 60% by weight of units of a monomer whose homopolymer has a Tg lower than 0° C. and polyurethane resins and, as an outer component, a copolymer of styrene and maleic acid, said copolymer having a softening point of at least 100° C., wherein the weight ratio of the core component to the outer component is within the range of 50/50 to 100/1 and said outer component covers said core component.
Claim 2
Dependent Claim
122 words
A powdery coating composition comprising polymer particles having an average particle size within the range of 0.5 to 200μ, said particles consisting of, as a core component, a powdery polymer having a softening point from 20° to 90° C. and selected from the group consisting of acrylic copolymers containing 5 to 60% by weight of units of a monomer whose homopolymer has a Tg lower than 0° C. and polyurethane resins and, as an outer component, a copolymer of styrene and maleic acid, said copolymer having a softening point of at least 100° C., wherein the weight ratio of the core component to the outer component is within the range of 50/50 to 100/1 and said outer component covers said core component.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the core is a polyurethane resin.
Claim 4
Dependent Claim
27 words
The composition of claim 2 wherein the styrene-maleic acid copolymer has an acid value of 110 to 115 and a melting point of 135° to 145° C.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |