Patent US4980108A successfully refreshed from Google Patents.
US4980108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a polyurethane coated biaxially oriented polyester film
Assignee: Teijin Ltd
•
Filing: 1989-02-27
•
Granted: 1990-12-25
•
Expires: 2009-02-27
Abstract
Abstract A process for producing a polyester film having a thin cured polyurethane coating, which comprises (1) applying an aqueous composition comprising a thermosetting polyurethane prepolymer as a film-forming component to at least one surface of an unoriented aromatic polyester film to form a thin wet coating on it, said polyurethane prepolymer being characterized by (i) having a polyol component at least 10% by weight of which is composed of a polyol containing a carbon-carbon double bond selected from unsaturated polyester polyols and polybutadiene polyols, the carbon-carbon double bond being cleavable under ultraviolet light, (ii) having a pendant anionic hydrophilic group in the polymer chain, and (iii) having isocyanate groups blocked with an oxime at the ends of the polymer chain, and (2) thereafter stretching and heat-setting the coated film, during which time the wet coating of the aqueous composition is dried and the polyurethane prepolymer is cured to form a thin cured polyurethane coating having a carbon-carbon double bond on the biaxially oriented polyester film.
Inventors
- 👤 Kenji Suzuki
- 👤 Sadayoshi Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:05
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0823; C08G18/10; C08G18/12; C08G18/28; C08G18/67; C08G18/68; C08G18/69; C08G18/698; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/056; C09; C09D; C09D175/00; C09D175/04; C09D175/14; C08J2367/00; C08J2367/02; C08J2475/00; C08J2475/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
209 words
A process for producing a biaxially oriented polyester film having a thin cured polyurethane coating, which comprises (1) applying an aqueous composition comprising a thermosetting polyurethane prepolymer as a film-forming component to at least one surface of a film of a substantially linear saturated aromatic polyester to form a thin wet coating on it, said polyurethane prepolymer being characterized by (i) having a polyol component at least 10% by weight of which is composed of a polyol containing a carbon-carbon double bond selected from the group consisting of unsaturated polyester polyols and polybutadiene polyols, the carbon-carbon double bond being cleavable under ultraviolet light, (ii) having a pendant anionic hydrophilic group in the prepolymer chain an amount of to render the prepolymer water-dispersible or water soluble, and (iii) having isocyanate groups blocked with an oxime at the ends of the polymer chain, said film being unstretched, monoaxially oriented or biaxally pre-stretched and (2) thereafter stretching the coated film in at least one direction to biaxially orient the stretched film and heat-setting the coated film, during which time the wet coating of the aqueous composition is dried and the polyurethane prepolymer is cured to form a thin cured polyurethane coating have a carbon-carbon double bond on the biaxially oriented polyester film.
Claim 2
Dependent Claim
209 words
A process for producing a biaxially oriented polyester film having a thin cured polyurethane coating, which comprises (1) applying an aqueous composition comprising a thermosetting polyurethane prepolymer as a film-forming component to at least one surface of a film of a substantially linear saturated aromatic polyester to form a thin wet coating on it, said polyurethane prepolymer being characterized by (i) having a polyol component at least 10% by weight of which is composed of a polyol containing a carbon-carbon double bond selected from the group consisting of unsaturated polyester polyols and polybutadiene polyols, the carbon-carbon double bond being cleavable under ultraviolet light, (ii) having a pendant anionic hydrophilic group in the prepolymer chain an amount of to render the prepolymer water-dispersible or water soluble, and (iii) having isocyanate groups blocked with an oxime at the ends of the polymer chain, said film being unstretched, monoaxially oriented or biaxally pre-stretched and (2) thereafter stretching the coated film in at least one direction to biaxially orient the stretched film and heat-setting the coated film, during which time the wet coating of the aqueous composition is dried and the polyurethane prepolymer is cured to form a thin cured polyurethane coating have a carbon-carbon double bond on the biaxially oriented polyester film.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which the aqueous composition has a solids concentration of up to 30% by weight.
Claim 4
Dependent Claim
28 words
The process of claim 1 in which the wet coating has a thickness corresponding to a weight of 0.5 to 20 g per m 2 of the film.
Claim 5
Dependent Claim
20 words
The process of claim 1 in which the heat-setting is carried out at a temperature of 150° to 240° C.
Claim 6
Dependent Claim
54 words
The process of claim 4 wherein in step (2) the coated film is stretched to provide a degree of crystallization and orientation such that its heat of crystal fusion is at least about 4 cal/g when measured by a differential scanning calorimeter in a nitrogen atmosphere at a temperature elevating rate of 10° C./min.
Claim 7
Dependent Claim
18 words
The process of claim 1 in which the unoriented aromatic polyester film is a monoaxially stretched aromatic polyester.
Claim 8
Dependent Claim
26 words
The process of claim 1 in which the polyurethane prepolymer has 3×10 -5 to 1×10 -3 equivalent, per gram of the prepolymer, of a hydrophilic group.
Claim 9
Dependent Claim
30 words
The process of claim 1 wherein the substantially linear saturated aromatic polyester is selected from the group consisting of polyethylene terephthalate, polyethylene isophthalate, polybutylene terephthalate, poly(1,4-cyclohexyle dimethylene terephthalate), and polyethylene-2,6-naphthalenedicarboxylate.
Claim 10
Dependent Claim
31 words
The process of claim 1 wherein the polyurethane prepolymer is characterized by (i) at least 20% by weight of the polyol component composed of a polyol having a carbon-carbon double bond.
Claim 11
Dependent Claim
25 words
The process of claim 9 wherein at least 50% by weight of the polyol component is composed of a polyol containing a carbon-carbon double bond.
Claim 12
Dependent Claim
13 words
The process of claim 10 wherein the polyol comprises an unsaturated polyester polyol.
Claim 13
Dependent Claim
12 words
The process of claim 10 wherein the polyol comprises a polybutadiene polyol.
Claim 14
Dependent Claim
51 words
The process of claim 1 wherein the polyurethane prepolymer is characterized by (ii) pendant anionic hydrophilic groups selected from the group consisting of --SO 3 M (where M is a alkali metal or an alkaline earth metal), --OH, and --COOR (where R is a residue of ammonia or a tertiary amine).
Claim 15
Dependent Claim
20 words
The process of claim 13 wherein the anionic hydrophilic groups comprise carboxyl groups neutralized with ammonia or a tertiary amine.
Claim 16
Dependent Claim
42 words
The process of claim 1 wherein the polyurethane prepolymer is characterized by (iii) having isocyanate groups blocked with an oxime selected from the group consisting of butane oxime, methyl ethyl ketone oxime and cyclohexyl oxime at the ends of the polymer chain.
Claim 17
Dependent Claim
21 words
The process of claim 1 in which the aqueous composition has a solid concentration of from 1 to 10% by weight.
Claim 18
Dependent Claim
29 words
The process of claim 1 in which the wet coating has a thickness corresponding to a weight of from 1 to 10 g per m 2 of the film.
References Cited (Backward Citations)
US930401A
Cited
US1001929A
Cited
US2064511A
Cited
DE724242C
Cited
US2539450A
Cited
BE547695A
Cited
US3061107A
Cited
US3241680A
Cited
US3397793A
Cited
US3442392A
Cited
US3578175A
Cited
US3769128A
Cited
US3904798A
Cited
US4065341A
Cited
US4101423A
Cited
JPS532390A
Cited
JPS5539279A
Cited
US4364885A
Cited
US4402830A
Cited
US4594202A
Cited
US4726901A
Cited
US4755337A
Cited
DE3515062A1
Cited
US4692196A
Cited
JPS62173252A
Cited
JPS62263237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-24 | 1994-06-25 | 1994-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-24 | 1998-06-25 | 1998-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-24 | 2002-06-25 | 2002-12-25 | $7700.00 | Window Closed / Lapsed |