Patent US4039720A successfully refreshed from Google Patents.
US4039720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated windshield with improved innerlayer
Assignee: PPG Industries Inc
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Filing: 1976-05-03
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Granted: 1977-08-02
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Expires: 1996-05-03
Abstract
Abstract Safety glass is made by laminating to a ply of glass a polyurethane film incorporating a photoinitiator. The exposed surface of the film is irradiated with ultraviolet light which activates the photoinitiator which in turn initiates crosslinking of the polymer. The polymer film retains its desirable mechanical and optical properties while the crosslinked surface has improved solvent-abrasion resistant.
Inventors
- 👤 Joseph Cherenko
- 👤 Charles W. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:37
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/1055; B32B17/10706; B32B17/1077; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/554; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0831; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31551; Y10T428/31598; Y10T428/31601; Y10T428/31616; Y10T428/31627; Y10T428/3163
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
94 words
A method for making a safety glass laminate comprising the steps of: a. preparing a transparent film of a thermoplastic urethane polymer, essentially free of ethylenic unsaturation, which comprises a photoinitiator in an amount effective to initiate cross-linking of said film; b. laminating said film to a transparent ply of a material selected from the group consisting of glass and rigid transparent plastics; and c. irradiating the exposed surface of the film with actinic radiation to effect crosslinking of the exposed surface thereby improving its resistance to abrasion in the presence of organic solvents.
Claim 2
Independent Claim
94 words
A method for making a safety glass laminate comprising the steps of: a. preparing a transparent film of a thermoplastic urethane polymer, essentially free of ethylenic unsaturation, which comprises a photoinitiator in an amount effective to initiate cross-linking of said film; b. laminating said film to a transparent ply of a material selected from the group consisting of glass and rigid transparent plastics; and c. irradiating the exposed surface of the film with actinic radiation to effect crosslinking of the exposed surface thereby improving its resistance to abrasion in the presence of organic solvents.
Claim 3
Dependent Claim
13 words
The method according to claim 1, wherein said actinic radiation is ultraviolet radiation.
Claim 4
Dependent Claim
14 words
The method according to claim 1, wherein said thermoplastic polymer is a polyester urethane.
Claim 5
Dependent Claim
26 words
The method according to claim 1, wherein said photoinitiator is selected from the group consisting of benzophenone, xanthone, acetophenone, anthraquinone, 2[2'-hydroxy 5'-methylphenyl] benzotriazole, anthrone and butanedione.
Claim 6
Dependent Claim
11 words
The method according to claim 1, wherein said photoinitiator is benzophenone.
Claim 7
Dependent Claim
11 words
The method according to claim 1, wherein said photoinitiator is xanthone.
Claim 8
Dependent Claim
73 words
The method according to claim 1, wherein said transparent film comprising a photoinitiator is formed by forming a film free of said initiator and then exposing said formed film to a composition containing said photoinitiator for sufficient time to incorporate into the film an effective amount of photoinitiator to crosslink the exposed surface portion of said film upon exposure to actinic radiation but insufficient to substantially impair the optical properties of said film.
Claim 9
Dependent Claim
28 words
The method according to claim 1, wherein said transparent film comprising a photoinitiator is formed by incorporating a photoinitiator into the polymer formulation prior to forming the film.
Claim 10
Dependent Claim
52 words
A transparent polymer film for use as an innerlayer in a bilayer safety glass laminate which consisting essentially of a thermoplastic urethane polymer, essentially free of ethylenic unsaturation, and an effective amount of photoinitiator which upon actinic radiation is capable of initiating crosslinking of said film especially at an exposed surface thereof.
Claim 11
Dependent Claim
52 words
A transparent polymer film for use as an innerlayer in a bilayer safety glass laminate which consisting essentially of a thermoplastic urethane polymer, essentially free of ethylenic unsaturation, and an effective amount of photoinitiator which upon actinic radiation is capable of initiating crosslinking of said film especially at an exposed surface thereof.
Claim 12
Dependent Claim
14 words
A film as described in claim 9, wherein the polymer is a polyester urethane.
Claim 13
Dependent Claim
27 words
A film as described in claim 9, wherein the photoinitiator is selected from the group consisting of benzophenone, xanthone, acetophenone, anthraquinone, 2[2'-hydroxy 5'-methylphenyl] benzotriazole, anthrone, and butanedione.
Claim 14
Dependent Claim
12 words
A film as described in claim 11, wherein said photoinitiator is benzophenone.
Claim 15
Dependent Claim
12 words
A film as described in claim 11, wherein said photoinitiator is xanthone.
Claim 16
Dependent Claim
63 words
A safety glass laminate comprising: a. a first ply of a material selected from the group consisting of glass and rigid transparent plastics; and b. a transparent second ply, bonded to said first ply, of a thermoplastic urethane polymer essentially free of ethylenic unsaturation and an effective amount of photoinitiator wherein the exposed surface of said thermoplastic polymer is crosslinked by actinic radiation.
Claim 17
Dependent Claim
63 words
A safety glass laminate comprising: a. a first ply of a material selected from the group consisting of glass and rigid transparent plastics; and b. a transparent second ply, bonded to said first ply, of a thermoplastic urethane polymer essentially free of ethylenic unsaturation and an effective amount of photoinitiator wherein the exposed surface of said thermoplastic polymer is crosslinked by actinic radiation.
Claim 18
Dependent Claim
14 words
The laminate as described in claim 14, wherein said first ply is transparent glass.
Claim 19
Dependent Claim
16 words
The laminate as described in claim 15, wherein said second ply is a transparent polyester polyurethane.
Claim 20
Dependent Claim
22 words
The laminate as described in claim 16, wherein said polyurethane is the reaction product of an aliphatic diisocyanate and a polyester polyol.
Claim 21
Dependent Claim
14 words
The laminate as described in claim 17, wherein said polyester polyol is polycaprolactone diol.
Claim 22
Dependent Claim
15 words
The laminate as described in claim 17, wherein said polyester polyol is a polycarbonate diol.
Claim 23
Dependent Claim
15 words
The laminate as described in claim 19, wherein said polycarbonate diol is a polyalkylenecarbonate diol.
Claim 24
Dependent Claim
15 words
The laminate as described in claim 17, wherein said polyester polyol is poly(1,4 butylene adipate)diol.
Claim 25
Dependent Claim
15 words
The laminate as described in claim 17, wherein said aliphatic diisocyanate is a cycloaliphatic diisocyanate.
Claim 26
Dependent Claim
15 words
The laminate as described in claim 22, wherein said cycloaliphatic diisocyanate is 4,4' methylene-bis-(cyclohexyl isocyanate).
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |