Patent US4948672A successfully refreshed from Google Patents.
US4948672A
Expired / Lapsed
US
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Polymeric laminate for safety glass
Assignee: Monsanto Co
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Filing: 1989-04-10
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Granted: 1990-08-14
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Expires: 2009-04-10
Abstract
Abstract A polymeric laminate of a sheet containing plasticized polyvinyl butyral chemically linked by urethane groups to a polyurethane layer which is preferably thermoset.
Inventors
- 👤 George E. Cartier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:31
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/306; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/1055; B32B17/10761; B32B17/1077; B32B27/06; B32B27/08; B32B27/40; B32B2329/00; B32B2329/04; B32B2329/06; B32B2375/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/31594; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
63 words
A polymeric laminate of plasticized polyvinyl butyral sheet containing about 17 to 25 weight % vinyl alcohol groups calculated as polyvinyl alcohol, said sheet being in face-adhering, inseparable bonding contact with a polyurethane layer as a result of chemical linkages formed at the interface between the sheet and layer by reaction between the vinyl alcohol groups and isocyanate groups associated with the polyurethane.
Claim 2
Dependent Claim
63 words
A polymeric laminate of plasticized polyvinyl butyral sheet containing about 17 to 25 weight % vinyl alcohol groups calculated as polyvinyl alcohol, said sheet being in face-adhering, inseparable bonding contact with a polyurethane layer as a result of chemical linkages formed at the interface between the sheet and layer by reaction between the vinyl alcohol groups and isocyanate groups associated with the polyurethane.
Claim 3
Dependent Claim
13 words
The laminate of claim 1 wherein the urethane groups have the formula: ##STR4##
Claim 4
Dependent Claim
10 words
The laminate of claim 2 wherein the polyurethane is thermoset.
Claim 5
Dependent Claim
10 words
The laminate of claim 3 wherein the polyurethane is aliphatic.
Claim 6
Dependent Claim
11 words
The laminate of claim 3 wherein the polyurethane is heat cured.
Claim 7
Dependent Claim
23 words
The laminate of any of claims 1, 2, 3, 4 or 5 wherein the polyurethane comprises the reaction product of polyol and diisocyanate.
Claim 8
Dependent Claim
15 words
The laminate of claim 1 where urethane groups are the linkages resulting from the reaction.
Claim 9
Dependent Claim
18 words
The laminate of claim 8 wherein the thickness of the polyurethane layer is about 1 to 10 mils.
Claim 10
Dependent Claim
38 words
The laminate of claim 8 wherein the polyurethane layer is formed from (i) polyol (ii) cross-linking agent and (iii) diisocyanate present in amount sufficient to react with both the polyol and vinyl alcohol groups of the polyvinyl butyral.
Claim 11
Dependent Claim
12 words
The laminate of claim 9 wherein the cross-linking agent is trimethylol propane.
Claim 12
Dependent Claim
28 words
The laminate of claim 1, 8, 9, 10 or 11 wherein the NCO/OH equivalent ratio of the reaction mixture which formed the polyurethane was between 1.01/1 to 1.3/1.
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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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |