Patent EP0362146A1 successfully refreshed from Google Patents.
US4874814A
Expired / Lapsed
US
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Cross-linked polyvinyl butyral
Assignee: Solutia Inc
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Filing: 1989-02-27
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Granted: 1989-10-17
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Expires: 2009-02-27
Abstract
Abstract Polyvinyl butyral (PVB) resin lightly cross-linked through stable intermolecular linkages developed, for example, through use of a dialdehyde or trialdehyde, to selectively increase PVB molecular weight and the modulus of a plasticized sheet formed therefrom intended for use in laminated safety glass assemblies.
Inventors
- 👤 George E. Cartier
- 👤 Peter H. Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:19
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/1055; B32B17/10697; B32B17/10761; C; C08; C08F; C08F8/00; C08F8/48; C08G; C08G81/00; C08G81/02; C08G81/024; C08G81/025; C08J; C08J5/00; C08J5/18; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
Polyvinyl butyral lightly cross-linked through stable intermolecular linkages wherein the extent of cross-linking is adequate to increase the viscosity of the polyvinyl butyral by about 2% to about 85% over its viscosity in the absence of such linkages said polyvinyl butyral containing 70 to 95 weight % vinyl butyral units.
Claim 2
Dependent Claim
50 words
Polyvinyl butyral lightly cross-linked through stable intermolecular linkages wherein the extent of cross-linking is adequate to increase the viscosity of the polyvinyl butyral by about 2% to about 85% over its viscosity in the absence of such linkages said polyvinyl butyral containing 70 to 95 weight % vinyl butyral units.
Claim 3
Dependent Claim
13 words
The polyvinyl butyral of claim 1 wherein the stable linkages are diacetal linkages.
Claim 4
Dependent Claim
21 words
The polyvinyl butyral of claim 2 wherein the diacetal linkages are developed through an aldehyde containing at least two aldehyde groups.
Claim 5
Dependent Claim
36 words
The polyvinyl butyral of claim 3 wherein the diacetal linkages are developed through a trialdehyde or a dialdehyde containing an aliphatic or an aromatic group or a mixture of aliphatic and aromatic groups between carbonyl groups.
Claim 6
Dependent Claim
30 words
The polyvinyl butyral of claim 1, 2, 3 or 4 wherein the intermolecular linkages are developed through a dialdehyde selected from the group consisting of glutaraldehyde, 4,4'(ethylenedioxy) dibenzaldehyde and 2-hydroxyhexanedial.
Claim 7
Dependent Claim
15 words
The polyvinyl butyral of claim 5 wherein the intermolecular linkages are developed through a trialdehyde.
Claim 8
Dependent Claim
14 words
The polyvinyl butyral of claim 5 wherein the diacetal linkages are developed through glutaraldehyde.
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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |