US5087405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In mold overlay process for gel coated glass fiber reinforced laminates
Assignee: NESTE POLYESTER Inc
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Filing: 1988-11-08
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Granted: 1992-02-11
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Expires: 2008-11-08
Abstract
Abstract A method of protecting glass fiber reinforced products from the effects of weathering by applying a polymeric resin overlay to the product in mold. Conventional waxing of molds is eliminated. The mold is prepared by applying a layer of a lecithin solution, and the overlay is applied thereafter. A layer of gel coat is then applied to the overlay, the gel coat is reinforced and the overlay-protected product is demolded. The invention also includes a method for making an overlay-protected synthetic marble product.
Inventors
- 👤 Walter J. Maker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:20
CPC Classifications
B; B29; B29C; B29C37/00; B29C37/0025; B29C37/0028; B29C37/0032; B29C2037/0035; B29K; B29K2105/00; B29K2105/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
74 words
A method of protecting gel coat layer of a glass fiber reinforced product against the effects of weathering, comprising the steps of: dissolving a preselected polymeric resin in a solvent to form an overlay material; applying the overlay material to a mold surface; applying a gel coat layer to the overlay material; applying a glass fiber and resin layer to the gel coat layer to reinforce it; and demolding the glass fiber reinforced product.
Claim 2
Independent Claim
74 words
A method of protecting gel coat layer of a glass fiber reinforced product against the effects of weathering, comprising the steps of: dissolving a preselected polymeric resin in a solvent to form an overlay material; applying the overlay material to a mold surface; applying a gel coat layer to the overlay material; applying a glass fiber and resin layer to the gel coat layer to reinforce it; and demolding the glass fiber reinforced product.
Claim 3
Dependent Claim
34 words
The method of claim 1, further comprising the step of selecting a thermoplastic polymeric resin that is a hydroxyl modified vinyl chloride-vinyl acetate copolymer as the preselected resin and dissolving it in a solvent.
Claim 4
Dependent Claim
24 words
The method of claim 1, further comprising the step of selecting cellulose acetate butyrate as the preselected resin and dissolving it in a solvent.
Claim 5
Dependent Claim
24 words
The method of claim 1, further comprising the step of selecting cellulose acetate propionate as the preselected resin and dissolving it in a solvent.
Claim 6
Dependent Claim
24 words
The method of claim 1, further comprising the step of selecting an acrylic copolymer as the preselected resin and dissolving it in a solvent.
Claim 7
Dependent Claim
23 words
The method of claim 1, further comprising the step of selecting a silicone as the preselected resin and dissolving it in a solvent.
Claim 8
Dependent Claim
40 words
The method of claim 1, further comprising the step of selecting a resin that is selected from the group consisting of a vinyl copolymer, cellulose acetate butyrate, cellulose acetate propionate, silicone or acrylic copolymer and dissolving it in a solvent.
Claim 9
Dependent Claim
25 words
The method of claim 1, further comprising the step of applying a lecithin solution to the mold surface prior to applying said overlay material thereto.
Claim 10
Dependent Claim
28 words
The method of claim 8, further comprising the step of applying a 2% by weight lecithin solution to the mold surface prior to applying said overlay material thereto.
Claim 11
Dependent Claim
19 words
The method of claim 9, further comprising the step of preparing said lecithin solution by dissolving lecithin in toluol.
Claim 12
Dependent Claim
30 words
The method of claim 1, further comprising the step of allowing said overlay material to dry to a print free state prior to applying said layer of gel coat thereto.
Claim 13
Dependent Claim
32 words
The method of claim 1, further comprising the step of allowing said gel coat layer to gel and cure at room temperature prior to applying said glass fiber and resin layer thereto.
Claim 14
Dependent Claim
20 words
The method of claim 1, further comprising the step of adding an ultraviolet radiation absorbing means to said overlay material.
Claim 15
Dependent Claim
19 words
The method of claim 13, further comprising the step of adding a light stabilizer means to said overlay material.
Claim 16
Dependent Claim
36 words
The method of claim 1, further comprising the step of adding an alkyd resin with unsaturated ethylenic groups to said overlay material to promote interfacial cross-linking and to insure chemical bonding with the gel coat layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |