Patent US3894024A successfully refreshed from Google Patents.
US3894024A
Expired / Lapsed
US
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Method for casting resins
Assignee: PPG Industries Inc
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Filing: 1974-01-09
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Granted: 1975-07-08
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Expires: 1994-01-09
Abstract
Abstract A method for casting liquid resinous material containing essentially immiscible, reactive constituents which involves mixing/reacting said material to produce a liquid, substantially homogeneous mass containing a predominance of partially reacted reactive constituents and casting said resinous material before the minimum time for complete reaction of a substantial portion of said constituents. The method is particularly useful for casting polyurethane-type resinous materials between a pair of rigid, transparent sheets to provude an essentially striae-free laminated window structure.
Inventors
- 👤 Joseph Cherenko
- 👤 Raymond P Harrison
- 👤 Joseph D Kelly
- 👤 William I Frey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:45
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/40; B29C66/41; B29C66/45; B01; B01F; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4314; B29C39/00; B29C39/22; B29C39/24; B29C39/26; B29C39/265; B29C65/00; B29C65/48; B29C65/52; B29C65/54; B29K; B29K2105/00; B29K2105/0002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
IN A METHOD FOR MAKING A TRANSPARENT LMINATED WINDOW FROM TTWO SPACED-APART GLASS SHEETS SEPARATED BY A CURED RESINOUS INTERLAYER, SAID METHOD COMPRISING MIXING AT A FIRST MIXING ZONE ESSENTIALLY IMMISCIBLE, REACTVE CONSTITUENTS, FOLLOWED BY FLOWING SAID MIXTURE INTO AND THROUGH A CONDUIT CONNECTING AND SEPARATING THE FIRST MIXING ZONE FROM PAIR OF SPACEDAPART TRANSPARENT RIGID SHEETS, SAID MIXTURE PARTIALLY REACTING IN THE CONDUIT TO FORM A FLOWABLE RESISNOUS LIQUID, CASTIN SAID RESINOUS LIQUID BETWEEN THE PAIR OF RIGID TRANSPARENT SHEETS AND CURING THE CAST RESINOUS LIQUID TO PRODUCE THE TRANSPARENT LAMINATED WINDOW WINDOW, THE IMPROVEMENT COMPRISING: A. SUBSEQUENTLY MIXING THE RESINOUS LIQUID WHIEL IT IS FLOWING THROUGH SAID CONDUIT IN A SECOND MIXING ZONE LOCATE
Claim 2
Dependent Claim
116 words
IN A METHOD FOR MAKING A TRANSPARENT LMINATED WINDOW FROM TTWO SPACED-APART GLASS SHEETS SEPARATED BY A CURED RESINOUS INTERLAYER, SAID METHOD COMPRISING MIXING AT A FIRST MIXING ZONE ESSENTIALLY IMMISCIBLE, REACTVE CONSTITUENTS, FOLLOWED BY FLOWING SAID MIXTURE INTO AND THROUGH A CONDUIT CONNECTING AND SEPARATING THE FIRST MIXING ZONE FROM PAIR OF SPACEDAPART TRANSPARENT RIGID SHEETS, SAID MIXTURE PARTIALLY REACTING IN THE CONDUIT TO FORM A FLOWABLE RESISNOUS LIQUID, CASTIN SAID RESINOUS LIQUID BETWEEN THE PAIR OF RIGID TRANSPARENT SHEETS AND CURING THE CAST RESINOUS LIQUID TO PRODUCE THE TRANSPARENT LAMINATED WINDOW WINDOW, THE IMPROVEMENT COMPRISING: A. SUBSEQUENTLY MIXING THE RESINOUS LIQUID WHIEL IT IS FLOWING THROUGH SAID CONDUIT IN A SECOND MIXING ZONE LOCATE
Claim 3
Dependent Claim
22 words
The method according to claim 1 in which said subsequent mixing occurs by passing said resinous liquid through a spiral-shaped static mixer.
Claim 4
Dependent Claim
23 words
The method according to claim 2 in which said subsequent mixing occurs by passing said resinous liquid through bristles of a spiral-shaped brush.
Claim 5
Dependent Claim
15 words
The method according to claim 1 wherein the essentially immiscible, reactive constituents comprise polyurethane-forming reactants.
Claim 6
Dependent Claim
21 words
The method according to claim 4 wherein the essentially immiscible, reactive constituents comprise isocyanate-terminated poly (oxyalkylene) glycol and polyol curing agents.
Claim 7
Dependent Claim
24 words
The method according to claim 4 in which said resinous material at the step of casting has a viscosity upwards from about 100 centipoises.
Claim 8
Dependent Claim
15 words
The method according to claim 5 wherein said curing agent comprises 1,4-butanediol and trimethylol propane.
Claim 9
Dependent Claim
17 words
The method according to claim 7 wherein said constituents are preheated to about 130*F. prior to mixing.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |