US3878036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety glass prepared by curing a b-stage polyurethane sheet
Assignee: PPG Industries Inc
•
Filing: 1972-09-08
•
Granted: 1975-04-15
•
Expires: 1992-09-08
Abstract
Abstract Curable B-stage polyurethanes suitable for use as interlayers for glass laminates comprise the reaction product of at least one hydroxyl-containing ester having a terminal acrylyl or substituted-acrylyl group, an organic diisocyanate and a polyol. The compositions are stable at room temperature even when containing a free radical-producing initiator but cure in the presence of free radicals to a hard, thermoset state. The preferred diisocyanates include isocyanato-terminated polyether adducts of poly(oxypolymethylene) glycols.
Inventors
- 👤 Wen-Hsuan Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:21
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/1055; B32B17/1077; B32B27/00; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/67; C08G18/671; C08G18/672; B32B2375/00; Y; Y10; Y10S; Y10S428/00; Y10S428/911; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
12 words
AN IMPACT RESISTANT, CLEAR SAFETY GLASS LAMINATE FORMED BY THE STEPS OF
Claim 2
Dependent Claim
12 words
AN IMPACT RESISTANT, CLEAR SAFETY GLASS LAMINATE FORMED BY THE STEPS OF
Claim 3
Dependent Claim
24 words
PLACING ONE OR MORE SHEETS OF GLASS IN ADHERENT CONTACT WITH A SOLID SHEET OF ESSENTIALLY LINEAR B-STAGE POLYURETHANE CORRESPONDING TO THE AVERAGE FORMULA:
Claim 4
Dependent Claim
24 words
PLACING ONE OR MORE SHEETS OF GLASS IN ADHERENT CONTACT WITH A SOLID SHEET OF ESSENTIALLY LINEAR B-STAGE POLYURETHANE CORRESPONDING TO THE AVERAGE FORMULA:
Claim 5
Dependent Claim
29 words
CURING SAID B-STAGE POLYURETHANE WITH THE AID OF A FREE RADICAL INITIATOR WHILE IN ADHERENT CONTACT WITH SAID GLASS BY ADDITION POLYMERIZATION THROUGH SAID ACRYLYL OR ALPHASUBSTITUTED ACRYLYL GROUP.
Claim 6
Dependent Claim
29 words
CURING SAID B-STAGE POLYURETHANE WITH THE AID OF A FREE RADICAL INITIATOR WHILE IN ADHERENT CONTACT WITH SAID GLASS BY ADDITION POLYMERIZATION THROUGH SAID ACRYLYL OR ALPHASUBSTITUTED ACRYLYL GROUP.
Claim 7
Dependent Claim
29 words
curing said B-stage polyurethane with the aid of a free radical initiator while in adherent contact with said glass by addition polymerization through said acrylyl or alpha-substituted acrylyl group.
Claim 8
Dependent Claim
29 words
curing said B-stage polyurethane with the aid of a free radical initiator while in adherent contact with said glass by addition polymerization through said acrylyl or alpha-substituted acrylyl group.
Claim 9
Dependent Claim
26 words
The laminate of claim 1 in which the group represented by R1 is derived from an isocyanato-terminated adduct of a polyether polyol or a polyester polyol
Claim 10
Dependent Claim
21 words
The laminate of claim 2 in which said isocyanato-terminated adduct is an adduct of an organic diisocyanate and a poly(oxypolymethylene) glycol.
Claim 11
Dependent Claim
18 words
The laminate of claim 1 in which the group represented by R1 is derived from a hydrocarbon diisocyanate.
Claim 12
Dependent Claim
13 words
The laminate of claim 4 in which said hydrocarbon diisocyanate is toluene diisocyanate.
Claim 13
Dependent Claim
35 words
The laminate of claim 1 in which the group represented by R1 is in part derived from an isocyanato-terminated adduct of an organic diisocyanate and poly(oxypolymethylene) glycol and in part derived from a hydrocarbon diisocyanate.
Claim 14
Dependent Claim
21 words
The laminate of claim 1 in which at least part of the polyol from which Y is derived is a diol.
Claim 15
Dependent Claim
11 words
The laminate of claim 7 in which said diol is 1,4-butanediol.
Claim 16
Dependent Claim
23 words
The laminate of claim 1 in which said hydroxyl-containing ester is a hydroxyalkyl or substitited hydroxyalkyl ester of acrylic or alpha-substituted acrylic acid.
Claim 17
Dependent Claim
16 words
The laminate of claim 9 in wh;ich said ester is hydroxyethyl or hydroxypropyl acrylate or methacrylate.
Claim 18
Dependent Claim
23 words
The laminate of claim 1 in which said ester is a substantially linear hydroxyl-containing polyester having a terminal acrylyl or alpha-substituted acylyl group.
Claim 19
Dependent Claim
23 words
The laminate of claim 11 in which said ester is formed by reacting acrylic or methacrylic acid, a dicarboxylic acid and a diol.
Claim 20
Dependent Claim
20 words
The laminate of claim 11 in which said ester is formed by reacting hydroxyethyl acrylate, phthalic anhydride and ethylene oxide.
Claim 21
Dependent Claim
15 words
The composition of claim 1 in which the source of free radicals an organic peroxide.
Claim 22
Dependent Claim
12 words
The laminate of claim 1 containing at least two sheets of glass.
Claim 23
Dependent Claim
21 words
The laminate of claim 1 containing one or more sheets of glass and one or more layers of hard, transparent plastic.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |