US5445872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated thermoplastics stabilized with bisbenzophenones
Assignee: BASF Corp
•
Filing: 1994-02-03
•
Granted: 1995-08-29
•
Expires: 2014-02-03
Abstract
Abstract Thermoplastic articles, preferably of polycarbonate, are advantageously stabilized by selected bisbenzophenone UV absorbers concentrated in the outer surface or coating layers of the article prepared by coextrusion techniques.
Inventors
- 👤 Joseph Suhadolnik
- 👤 James H. Botkin
- 👤 Carmen Hendricks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:19
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/132; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
172 words
A stabilized multi-layered, thermoplastic article, prepared by a coextrusion process which process comprises coextruding a thermoplastic resin or mixture of thermoplastic resins to give a multi-layered thermoplastic article having an outer UV absorbing thermoplastic layer 0.1 to 10 mil (0.00254 to 0.254 mm) thick, which said outer UV absorbing layer contains 0.1 to 20% by weight of a bisbenzophenone UV absorber of the formula ##STR4## wherein X is a straight or branched chain alkylene of 1 to 16 carbon atoms, o-, m- or p-xylylene or an oxa-alkanediyl of the formula --CH 2 CH 2 [OCH 2 CH 2 ] n --, --CH 2 CH(CH 3 )[OCH 2 CH(CH 3 )] n -- or --CH 2 CH 2 CH 2 CH 2 [OCH 2 CH 2 CH 2 CH 2 ] n -- where n is 1-4, Y is hydrogen, straight or branched chain alkyl of 1-18 carbon atoms, and Z is hydrogen, chloro, straight or branched chain alkyl of 1 to 18 carbon atoms or alkoxy of 1 to 18 carbon atoms.
Claim 2
Dependent Claim
172 words
A stabilized multi-layered, thermoplastic article, prepared by a coextrusion process which process comprises coextruding a thermoplastic resin or mixture of thermoplastic resins to give a multi-layered thermoplastic article having an outer UV absorbing thermoplastic layer 0.1 to 10 mil (0.00254 to 0.254 mm) thick, which said outer UV absorbing layer contains 0.1 to 20% by weight of a bisbenzophenone UV absorber of the formula ##STR4## wherein X is a straight or branched chain alkylene of 1 to 16 carbon atoms, o-, m- or p-xylylene or an oxa-alkanediyl of the formula --CH 2 CH 2 [OCH 2 CH 2 ] n --, --CH 2 CH(CH 3 )[OCH 2 CH(CH 3 )] n -- or --CH 2 CH 2 CH 2 CH 2 [OCH 2 CH 2 CH 2 CH 2 ] n -- where n is 1-4, Y is hydrogen, straight or branched chain alkyl of 1-18 carbon atoms, and Z is hydrogen, chloro, straight or branched chain alkyl of 1 to 18 carbon atoms or alkoxy of 1 to 18 carbon atoms.
Claim 3
Dependent Claim
19 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein X is alkylene of 2 to 10 carbon atoms.
Claim 4
Dependent Claim
15 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein Y is hydrogen or tert-butyl.
Claim 5
Dependent Claim
17 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein Z is hydrogen, chloro, tert-butyl or methoxy.
Claim 6
Dependent Claim
26 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein X is alkylene of 3 to 10 carbon atoms and Y and Z are both hydrogen.
Claim 7
Dependent Claim
23 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein the thermoplastic layer is 0.1 to 5 mil (0.00254 to 0.127 mm) thick.
Claim 8
Dependent Claim
21 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein said layer contains 2% to 15% by weight of the bisbenzophenone.
Claim 9
Dependent Claim
21 words
A stabilized multi-layered, thermoplastic article according to claim 7 wherein said layer contains 5% to 10% by weight of the bisbenzophenone.
Claim 10
Dependent Claim
27 words
A stabilized multi-layered, thermoplastic article according to claim 1 wherein the thermoplastic article and the coating layer are of the same thermoplastic resin or different thermoplastic resins.
Claim 11
Dependent Claim
49 words
A stabilized multi-layered, thermoplastic article according to claim 9 wherein the thermoplastic resin is selected from the group consisting of aromatic polycarbonates, polyesters, polyester carbonates, polyphenylene oxide, polyvinyl chloride, polypropylene, polyethylene, polyacrylates, polymethacrylates and copolymers and blends which are styrene and acrylonitrile on polybutadiene and styrene and maleic anhydride.
Claim 12
Dependent Claim
36 words
A stabilized multi-layered, thermoplastic article according to claim 10 wherein the thermoplastic resin is a polycarbonate based on a dihydric phenol selected from the group consisting of 2,2-bis-(4-hydroxyphenyl)propane (bisphenol A); 2,4-bis-(4-hydroxyphenyl)-2-methylbutane; 1,1-bis-(4-hydroxyphenyl)cyclohexane; 2,2-bis-(3-chloro-4-hydroxyphenyl)propane; 4,4'-sulfonyldiphenol; and 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane.
Claim 13
Dependent Claim
28 words
A stabilized multi-layered, thermoplastic article according to claim 11 wherein the thermoplastic resin for both the article and the coating layer is a polycarbonate based on bisphenol A.
References Cited (Backward Citations)
US3043709A
Cited
US3309220A
Cited
US3487505A
Cited
US3580927A
Cited
US3666713A
Cited
US3557265A
Cited
GB1396240A
Cited
JPS5293462A
Cited
JPS5624418A
Cited
US4353965A
Cited
JPS5712643A
Cited
US4477521A
Cited
EP0110221A2
Cited
US4707393A
Cited
GB2137935A
Cited
US4576870A
Cited
US4540623A
Cited
US4668588A
Cited
EP0247480A2
Cited
US4776913A
Cited
DE3739765A1
Cited
US5108835A
Cited
US4861664A
Cited
JPH01245046A
Cited
EP0345884A2
Cited
US4992322A
Cited
CA2002177A1
Cited
US4937026A
Cited
JPH0453883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |