US3850671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying and crystallizing coatings
Assignee: EIDP Inc
•
Filing: 1972-09-27
•
Granted: 1974-11-26
•
Expires: 1992-09-27
Abstract
Abstract A process for drying and crystallizing a polymeric coating deposited from an aqueous system on a heat-sensitive film which comprises drying the coated film by radiant heat while moving it in a counter-current stream of air and thereafter urging the coated surface into contact with a polished heated roll with a nip roll.
Inventors
- 👤 E Petty
- 👤 S Sberna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:55
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/02; B05D3/0254; B05D3/0263; B05D7/00; B05D7/02; B05D7/04; B05D2506/00; B05D2506/20; B05D2506/25
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
IN A CONTINUOUS PROCESS FOR DRYING A COALESCIBLE VINYLIDENE CHLORIDE COPOLYMER COATING APPLIED FROM AN AQUEOUS SYSTEM TO AN ORIENTED POLYETHYLENE TEREPHTHALATE FILM BASE WHICH PROCESS COMPRISES: A. ADVANCING THE COATED FILM; AND B. DRYING THE COATED FILM UNTIL IT IS IN A SUBSTANTIALLY MOISTURE-FREE STSTE BY SUBJECTING THE COATED FILM TO RADIANT HEAT IN A STREAM OF AIR FLOWING COUNTERCURRENT TO THE DIRECTION OF TRAVEL OF THE ADVANCING FILM, WHILE MAINTAINING THE FILM AT A TEMPERATURE OF ABOUT 60* TO 90*C., THE IMPROVEMENT WHEREIN THE VINYLIDENE CHLORIDE COPOLYMER COATING IS THEN CRYSTALLIZED, WITHOUT DISTORTION OF THE POLYETHYLENE TEREPHTHALATE FILM, BY C. CONTACTING THE DRIED COATED FILM WITH A ROLL HAVING A POLISHED SURFACE AND HEATED TO A TEMPERATURE OF ABOUT 115* TO 120*C. WHEREIN SAID FILM IS URGED INTO CONTACT WITH SAID HEATED ROLL AT ITS LINE OF INITIAL CONTACT BY AN ELASTOMER-COVERED NIP ROLL FOR A PERIOS OF TIME SUFFICIENT TO HEAT THE COATING TO A TEMPERATURE OF ABOUT 110* TO 120*C.
Claim 2
Dependent Claim
164 words
IN A CONTINUOUS PROCESS FOR DRYING A COALESCIBLE VINYLIDENE CHLORIDE COPOLYMER COATING APPLIED FROM AN AQUEOUS SYSTEM TO AN ORIENTED POLYETHYLENE TEREPHTHALATE FILM BASE WHICH PROCESS COMPRISES: A. ADVANCING THE COATED FILM; AND B. DRYING THE COATED FILM UNTIL IT IS IN A SUBSTANTIALLY MOISTURE-FREE STSTE BY SUBJECTING THE COATED FILM TO RADIANT HEAT IN A STREAM OF AIR FLOWING COUNTERCURRENT TO THE DIRECTION OF TRAVEL OF THE ADVANCING FILM, WHILE MAINTAINING THE FILM AT A TEMPERATURE OF ABOUT 60* TO 90*C., THE IMPROVEMENT WHEREIN THE VINYLIDENE CHLORIDE COPOLYMER COATING IS THEN CRYSTALLIZED, WITHOUT DISTORTION OF THE POLYETHYLENE TEREPHTHALATE FILM, BY C. CONTACTING THE DRIED COATED FILM WITH A ROLL HAVING A POLISHED SURFACE AND HEATED TO A TEMPERATURE OF ABOUT 115* TO 120*C. WHEREIN SAID FILM IS URGED INTO CONTACT WITH SAID HEATED ROLL AT ITS LINE OF INITIAL CONTACT BY AN ELASTOMER-COVERED NIP ROLL FOR A PERIOS OF TIME SUFFICIENT TO HEAT THE COATING TO A TEMPERATURE OF ABOUT 110* TO 120*C.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the coated film is cooled after it has contacted the heated roll.
Claim 4
Dependent Claim
67 words
The Process of claim 1 wherein the coated film is advanced at a film velocity of about 167 to 350 yards per minute and the coated film is dried by subjecting the advancing film to radiant heat in a counter-current stream of air having a velocity of about 100 to 500 yards per minute for a time sufficient to heat the film to about 60* to 70*C.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein the film base is coated on one side only and the uncoated side of the film base is urged into contact with the heated roll.
Claim 6
Dependent Claim
42 words
The process of claim 1 wherein the aqueous polymeric coating composition is an aqueous dispersion of 15 to 65 weight percent solids of a vinylidene chloride copolymer containing at least 85 weight percent vinylidene chloride based on the weight of solids present.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |