US4413025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating composition for polycarbonate moldings containing partially hydrolyzed alkyltrialkoxysilane and polyvinylbutyral
Assignee: Daicel Corp
•
Filing: 1981-10-20
•
Granted: 1983-11-01
•
Expires: 2001-10-20
Abstract
Abstract A coating composition for polycarbonate moldings comprises (A) 100 parts by weight of a partially hydrolyzed condensate of an alkyltrialkoxysilane of the general formula: R.sup.1 Si(OR.sup.2).sub.3 wherein R 1 represents an alkyl group of 1-4 carbon atoms and R 2 represents an alkyl group of 1-4 carbon atoms, and (B) 0.5-6 parts by weight of polyvinylbutyral resin.
Inventors
- 👤 Mitsunobu Haga
- 👤 Yasuzi Omori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:22
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/04; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J2369/00; C08J2483/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A coating composition which is curable to provide a tenacious, transparent, mar-resistant, flexible coating on a polycarbonate molding, which comprises a mixture of (A) 100 parts by weight of an organic-solvent-soluble, partially hydrolyzed condensate of an alkyltrialkoxysilane having the formula R.sup.1 Si(OR.sup.2).sub.3 wherein R 1 is alkyl having 1 to 4 carbon atoms and R 2 is alkyl having 1 to 4 carbon atoms, said condensate being free of tetraalkoxysilanes and copolycondensates of tetraalkoxysilanes, and (B) 0.5 to 6 parts by weight of polyvinylbutyral resin.
Claim 2
Dependent Claim
85 words
A coating composition which is curable to provide a tenacious, transparent, mar-resistant, flexible coating on a polycarbonate molding, which comprises a mixture of (A) 100 parts by weight of an organic-solvent-soluble, partially hydrolyzed condensate of an alkyltrialkoxysilane having the formula R.sup.1 Si(OR.sup.2).sub.3 wherein R 1 is alkyl having 1 to 4 carbon atoms and R 2 is alkyl having 1 to 4 carbon atoms, said condensate being free of tetraalkoxysilanes and copolycondensates of tetraalkoxysilanes, and (B) 0.5 to 6 parts by weight of polyvinylbutyral resin.
Claim 3
Dependent Claim
32 words
A coating composition as claimed in claim 1, in which said composition is prepared by mixing the alkyltrialkoxysilane and polyvinylbutyral resin and then partially hydrolyzing the mixture in the presence of water.
Claim 4
Dependent Claim
24 words
A coating composition as clamed in claim 1, in which said alkyltrialkoxysilane is selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane and ethyltriethoxysilane.
Claim 5
Dependent Claim
14 words
A polycarbonate article coated with the coating composition claimed in claim 1 and cured.
Claim 6
Dependent Claim
32 words
A coating composition as claimed in claim 1, in which said condensate is the product of the partial hydrolysis and condensation of said alkyltrialkoxysilane, in the presence of water and an acid.
Claim 7
Dependent Claim
20 words
A coating solution consisting essentially of a coating composition as claimed in claim 1 dissolved in an inert organic solvent.
Claim 8
Dependent Claim
20 words
A coating solution as claimed in claim 6, further containing an effective amount of a catalyst for curing said condensate.
Claim 9
Dependent Claim
80 words
A coating solution as claimed in claim 6, in which said solvent is a mixture of 30 to 70 parts by weight of an alkanol having from 1 to 5 carbon atoms, from 1 to 20 parts by weight of acetic acid, from 0.5 to 20 parts of water and 0 to 30 parts by weight of another solvent, said coating solution containing from 10 to 40 percent by weight of said mixture of said condensate and said polyvinylbutyral resin.
Claim 10
Dependent Claim
53 words
A coating process which comprises applying to a polycarbonate substrate a thin coating film of a coating solution as claimed in claim 6 and then heating the coated polycarbonate substrate, at a temperature in the range of about 80° to 135° C., to form a hardened dry coating film on said polycarbonate substrate.
Claim 11
Dependent Claim
11 words
A coated polycarbonate molding prepared by the process of claim 1.
References Cited (Backward Citations)
US2506320A
Cited
US3000842A
Cited
US3252825A
Cited
US3240741A
Cited
US3392130A
Cited
US4338375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |