US4921881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-hardenable agent for the scratch-resistant coating of organic glasses
Assignee: Evonik Operations GmbH
•
Filing: 1988-06-07
•
Granted: 1990-05-01
•
Expires: 2008-06-07
Abstract
Abstract A radiation-hardenable agent for the scratch-resistant coating of organic glasses consists of a cocondensate of vinyl trimethoxysilane or vinyl triethoxysilane and tetramethoxysilane or tetraethoxysilane, a reactive diluent which comprises at least 2 vinyl, acrylic or methacrylic groups per molecule and, if necessary, of a known photoinitiator. The agent can be prepared by forming the cocondensate in the presence of an amount of water which is at least equivalent to the methoxy or ethoxy groups present or in the presence of a small amount of a carboxylic acid, removing all volatile portions of the reaction mixture and mixing the oily siloxane remaining as residue with the other components.
Inventors
- 👤 Gerhard Morlock
- 👤 F. Werner Weigelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:08
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/10; C08; C08F; C08F283/00; C08F283/12; C08F283/124; C09D4/00; C09D4/06; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A radiation-hardenable agent for the scratch-resistant coating of organic glasses, consisting essentially of (A) 82 to 64% by weight of a cocondensate prepared by the cocondensation of (A1) 90 to 65% by weight of a member of the group consisting of vinyl trimethoxysilane, vinyl triethoxysilane and mixtures of these two silanes and (A2) 10 to 35% by weight of a member of the group consisting of tetramethoxysilane, tetraethoxysilane and mixtures of these two silanes (B) 9 to 27% by weight of at least one reactive diluent comprising at least 2 vinyl, acrylic or methacrylic groups per molecule and (C) 0 to 9% by weight of at least one known photoinitiator, the total amount of components (A), (B) and (C) being 100% by weight.
Claim 2
Dependent Claim
123 words
A radiation-hardenable agent for the scratch-resistant coating of organic glasses, consisting essentially of (A) 82 to 64% by weight of a cocondensate prepared by the cocondensation of (A1) 90 to 65% by weight of a member of the group consisting of vinyl trimethoxysilane, vinyl triethoxysilane and mixtures of these two silanes and (A2) 10 to 35% by weight of a member of the group consisting of tetramethoxysilane, tetraethoxysilane and mixtures of these two silanes (B) 9 to 27% by weight of at least one reactive diluent comprising at least 2 vinyl, acrylic or methacrylic groups per molecule and (C) 0 to 9% by weight of at least one known photoinitiator, the total amount of components (A), (B) and (C) being 100% by weight.
Claim 3
Dependent Claim
27 words
A radiation-hardenable agent as set forth in claim 1 in which the ratio of vinyl groups to silicon atoms in component (A) is between 0.5:1 and 0.92:1.
Claim 4
Dependent Claim
25 words
A radiation-hardenable agent according to claim 2 in which the ratio of vinyl groups to silicon atoms in component (A) is between 0.75:1 and 0.85:1.
Claim 5
Dependent Claim
31 words
A radiation-hardenable agent according to any one of claims 1 to 3 in which 1 to 10% by weight of component (B) comprises at least one free hydroxyl group per molecule.
Claim 6
Dependent Claim
25 words
A radiation-hardenable agent according to any one of claims 1 to 3 in which component (B) is a mixture of pentaerythritol triacrylate and hexane diol-1,6-diacrylate.
Claim 7
Dependent Claim
34 words
A radiation-hardenable agent according to any one of claims 1 to 3 in which the amount of component (C) is 7 to 9% by weight, said agent being hardenable by means of ultraviolet radiation.
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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |