US4145477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rigidized acrylic articles and method
Assignee: Rohm and Haas Co
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Filing: 1974-11-11
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Granted: 1979-03-20
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Expires: 1994-11-11
Abstract
Abstract Compositions which cure at room temperature comprising an acrylic polymer dissolved in an acrylic monomer, a cross-linking monomer, hydrated alumina, fibrous reinforcement, a free radical catalyst and a catalyst promoter for use in rigidizing acrylic sheet and gel coats.
Inventors
- 👤 Leonard H. Smiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:18
CPC Classifications
C; C09; C09D; C09D4/00; C09D4/06; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/05; C08J2333/00; C08J2433/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31645; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A composite of an acrylic substrate or gel coat coated with a cured rigidizing composition, said rigidizing system applied to at least one side of said acrylic substrate or gel coat and comprising, in its uncured state, an acrylic thermoplastic polymer dissolved in an acrylic monomer, a cross-linking monomer, hydrated alumina and fibrous reinforcement.
Claim 2
Dependent Claim
54 words
A composite of an acrylic substrate or gel coat coated with a cured rigidizing composition, said rigidizing system applied to at least one side of said acrylic substrate or gel coat and comprising, in its uncured state, an acrylic thermoplastic polymer dissolved in an acrylic monomer, a cross-linking monomer, hydrated alumina and fibrous reinforcement.
Claim 3
Dependent Claim
22 words
The composite of claim 1 wherein the hydrated alumina comprises about 40 to 80% by weight of the composition exculsive of reinforcement.
Claim 4
Dependent Claim
19 words
The composite of claim 1 wherein the fibrous reinforcement comprises about 10 to 25% by weight of the composition.
Claim 5
Dependent Claim
13 words
The composite of claim 1 wherein the fibrous reinforcement is chopped glass fiber.
Claim 6
Dependent Claim
26 words
The composite of claim 1 wherein the acrylic thermoplastic polymer is polymerized from a monomer system containing a minor amount of acrylic acid or methacrylic acid.
Claim 7
Dependent Claim
35 words
A method of rigidizing acrylic sheet or gel coat comprising applying to at least one side of said sheet the rigidizing composition set forth in claim 1 and curing at room temperature and atmosphere pressure.
Claim 8
Dependent Claim
19 words
The method of claim 6 wherein the composition further contains a peroxy catalyst and a catalyst promoter comprising N,N-hydroxyethyl-p-toluidine.
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) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |