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Patent US4544582A successfully refreshed from Google Patents.
US4544582A
Expired / Lapsed
US
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Primer compositions for improving adhesion of abrasion resistant silicone coatings to plastic surfaces
Assignee: Dow Silicones Corp
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Filing: 1984-09-24
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Granted: 1985-10-01
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Expires: 2004-09-24
Abstract
Abstract Primer compositions are disclosed for improving the adhesion of abrasion resistant polysiloxane coatings to plastic substrates. The primers contain a thermosettable acrylic resin, an aminofunctional organosilicon compound, and optionally an ultraviolet light screening compound. A process employing the primer compositions to provide more durable adhesion of transparent, abrasion resistant polysiloxane coatings on plastic substrates is also disclosed.
Inventors
- 👤 Kelly L. Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J2369/00; C08J2483/00; C08J2483/04; C08L; C08L83/00; C08L83/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
A method of improving the durability of the adhesion of abrasion-resistant silicone coatings on plastic articles, the method comprising: (A) applying to the surface of a plastic article a primer composition containing from 99 to 70 weight percent of organic solvent and 1 to 30 weight percent of coating components containing (I) a thermosettable acrylic resin and (II) from 0.1 to 50 weight percent based on (I) of an aminofunctional organo silicon compound of the general formula ##STR5## wherein R is hydrogen or a monovalent hydrocarbon radical of 1 to 12 carbon atoms, R' is a divalent alkylene radical of 3 or 4 carbon atoms, R" is a monovalent radical selected from the group consisting essentially of hydrogen, alkyl radicals of 1 to 4 carbon atoms and the --CH 2 CH 2 NH 2 radical, and x has an average value from 0 to 3; (B) evaporating off a substantial portion of the organic solvent of the primer composition; (C) thermally curing the coating components to form a primer layer on the plastic surface; (D) applying over the primer layer, a colloidal silica filled thermoset organopolysiloxane; and (E) thermally curing the colloidal silica filled thermoset organopolysiloxane to an abrasion-resistant silicone coating.
Claim 2
Independent Claim
201 words
A method of improving the durability of the adhesion of abrasion-resistant silicone coatings on plastic articles, the method comprising: (A) applying to the surface of a plastic article a primer composition containing from 99 to 70 weight percent of organic solvent and 1 to 30 weight percent of coating components containing (I) a thermosettable acrylic resin and (II) from 0.1 to 50 weight percent based on (I) of an aminofunctional organo silicon compound of the general formula ##STR5## wherein R is hydrogen or a monovalent hydrocarbon radical of 1 to 12 carbon atoms, R' is a divalent alkylene radical of 3 or 4 carbon atoms, R" is a monovalent radical selected from the group consisting essentially of hydrogen, alkyl radicals of 1 to 4 carbon atoms and the --CH 2 CH 2 NH 2 radical, and x has an average value from 0 to 3; (B) evaporating off a substantial portion of the organic solvent of the primer composition; (C) thermally curing the coating components to form a primer layer on the plastic surface; (D) applying over the primer layer, a colloidal silica filled thermoset organopolysiloxane; and (E) thermally curing the colloidal silica filled thermoset organopolysiloxane to an abrasion-resistant silicone coating.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein x is 3 and R is an alkyl radical of 1 to 4 atoms.
Claim 4
Dependent Claim
22 words
The method of claim 2 wherein R is methyl, R' is trimethylene and R" is --CH 2 CH 2 NH 2 .
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein R is ethyl, R' is trimethylene and R" is hydrogen.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein x has an average value of 1.5 to 2.0, R' is trimethylene and R" is --CH 2 CH 2 NH 2 .
Claim 7
Dependent Claim
29 words
The method of claim 5 wherein 30 to 50% of the R radicals are alkyl radicals of 8 to 12 carbon atoms and the remaining R radicals are methyl.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein R is hydrogen, R' is trimethylene and R" is --CH 2 CH 2 NH 2 .
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein R is hydrogen, R' is trimethylene and R" is hydrogen.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein the primer composition further contains from 0.1 to 100 weight percent based on (I) of an ultraviolet light screening compound.
Claim 11
Dependent Claim
14 words
The method of claim 9 wherein the plastic article is a transparent polycarbonate article.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |