US4543144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous polyurethane compositions containing crosslinking agents and their use for heat-active one-coat reverse coating
Assignee: Bayer AG
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Filing: 1984-04-11
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Granted: 1985-09-24
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Expires: 2004-04-11
Abstract
Abstract This invention relates to compositions of aqueous polyurethane dispersions containing polyurethanes having lateral OH-groups, optionally in admixture with PU-dispersions without any lateral OH-groups, which contain a combination of formaldehyde resins and blocked polyisocyanates as crosslinking agent and, optionally handle-improving agents, silicones and standard additives. The present invention also relates to the use of these compositions for the production of light coatings by the heat-activated, one-coat reverse coating process, in which the PU-composition is applied to a temporary support and dried, after which the (textile) substrate is laminated onto the dry polyurethane film at elevated temperature and pressure and the polyurethane laminate formed is subsequently crosslinked at a relatively high temperature. Mixed crosslinking with formaldehyde resins plus blocked polyisocyanates makes it possible to obtain coatings characterized by outstanding substrate adhesion and wet strength values.
Inventors
- 👤 Wilhelm Thoma
- 👤 Klaus Nachtkamp
- 👤 Walter Schroer
- 👤 Rolf Langel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:20
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0866; C08G18/10; C08K; C08K5/00; C08K5/16; C08K5/20; C08L; C08L101/00; C08L61/00; C08L61/20; C08L75/00; C08L75/04; C08L83/00; C08L83/04; C09; C09D; C09D175/00; C09D175/04; Y; Y10; Y10S; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
113 words
An aqueous, crosslinker-containing coating composition having a solids content of about 20 to 60% by weight and based on polyurethane dispersion which comprises (I) 100 parts of solids of at least one aqueous polyurethane dispersion containing (A) from about 43 to 100% by weight of a dispersed polyurethane containing lateral OH-groups and (B) from 0 to about 57% by weight of a dispersed polyurethane without lateral OH-groups and (II) from about 3 to 50 parts of solids, based on the solids of I, of a crosslinker combination of (C) from about 2.5 to 90% by weight of a formaldehyde resin and (D) from about 10 to 97.5% by weight of a blocked polyisocyanate.
Claim 2
Dependent Claim
113 words
An aqueous, crosslinker-containing coating composition having a solids content of about 20 to 60% by weight and based on polyurethane dispersion which comprises (I) 100 parts of solids of at least one aqueous polyurethane dispersion containing (A) from about 43 to 100% by weight of a dispersed polyurethane containing lateral OH-groups and (B) from 0 to about 57% by weight of a dispersed polyurethane without lateral OH-groups and (II) from about 3 to 50 parts of solids, based on the solids of I, of a crosslinker combination of (C) from about 2.5 to 90% by weight of a formaldehyde resin and (D) from about 10 to 97.5% by weight of a blocked polyisocyanate.
Claim 3
Dependent Claim
14 words
The coating composition of claim 1 wherein said lateral OH-groups are lateral hydroxyalkyl groups.
Claim 4
Dependent Claim
47 words
The coating composition of claim 1 wherein said lateral OH-groups are hydroxyethyl and/or 2-hydroxypropyl groups which are obtained by reacting (1) an NCO-prepolymer with a bis-oxazolidine and/or (2) a predominantly linear NCO-prepolymer containing at least one isocyanate group and at least one oxazolidine group and (3) water.
Claim 5
Dependent Claim
15 words
The coating composition of claim 1 wherein said blocked polyisocyanate is a blocked aromatic polyisocyanate.
Claim 6
Dependent Claim
15 words
The coating composition of claim 3 wherein said blocked polyisocyanate is a blocked aromatic polyisocyanate.
Claim 7
Dependent Claim
45 words
The coating composition of claim 1 which additionally comprises (III) from about 0.3 to 3% by weight, based on the solids of I, of a handle-improving agent comprising a finely dispersed polymer selected from the group consisting of polyolefin, polyacrylates, polyamides, polyterephthalates and mixtures thereof.
Claim 8
Dependent Claim
26 words
The coating composition of claim 1 which additionally comprises (IV) from about 1 to 5% by weight, based on the solids of I, of a silicone.
Claim 9
Dependent Claim
101 words
An aqueous, crosslinker-containing coating composition having a solids content of about 20-60% by weight and based on polyurethane dispersions which comprises (I) 100 parts of solids of at least one aqueous polyurethane dispersion containing (A) from about 70 to 100% of a dispersed polyurethane containing lateral OH-groups and (B) from 0 to about 30% of a dispersed polyurethane without any lateral OH-groups, (II) from about 4-40 parts of solids, based on the solids of I, of a crosslinker combination of (C) from about 3-60% by weight of a formaldehyde-urea and/or formaldehydemelamine resin and (D) from about 40-97% of a blocked isocyanate.
Claim 10
Dependent Claim
101 words
An aqueous, crosslinker-containing coating composition having a solids content of about 20-60% by weight and based on polyurethane dispersions which comprises (I) 100 parts of solids of at least one aqueous polyurethane dispersion containing (A) from about 70 to 100% of a dispersed polyurethane containing lateral OH-groups and (B) from 0 to about 30% of a dispersed polyurethane without any lateral OH-groups, (II) from about 4-40 parts of solids, based on the solids of I, of a crosslinker combination of (C) from about 3-60% by weight of a formaldehyde-urea and/or formaldehydemelamine resin and (D) from about 40-97% of a blocked isocyanate.
Claim 11
Dependent Claim
14 words
The coating composition of claim 8 wherein said lateral OH-groups are lateral hydroxyalkyl groups.
Claim 12
Dependent Claim
47 words
The coating composition of claim 8 wherein said lateral OH-groups are hydroxyethyl and/or 2-hydroxypropyl groups which are obtained by reacting (1) an NCO-prepolymer with a bis-oxazolidine and/or (2) a predominantly linear NCO-prepolymer containing at least one isocyanate group and at least one oxazolidine group and (3) water.
Claim 13
Dependent Claim
15 words
The coating composition of claim 8 wherein said blocked polyisocyanate is a blocked aromatic polyisocyanate.
Claim 14
Dependent Claim
15 words
The coating composition of claim 10 wherein said blocked polyisocyanate is a blocked aromatic polyisocyanate.
Claim 15
Dependent Claim
45 words
The coating composition of claim 8 which additionally comprises (III) from about 0.3 to 3% by weight, based on the solids of I, of a handle-improving agent comprising a finely dispersed polymer selected from the group consisting of polyolefin, polyacrylates, polyamides, polyterephthalates and mixtures thereof.
Claim 16
Dependent Claim
26 words
The coating composition of claim 8 which additionally comprises (IV) from about 1 to 5% by weight, based on the solids of I, of a silicone.
Claim 17
Dependent Claim
59 words
A process for the production of a coating using the heat-activated, one-coat reverse coating process which comprises (a) applying the coating composition of claim 1 to a temporary support, (b) drying said coating composition, (c) laminating a textile substrate onto the dry coating composition at elevated temperature and pressure and (d) crosslinking said dry coating composition at elevated temperature.
Claim 18
Dependent Claim
43 words
The process of claim 15 wherein step (b) is conducted at temperature of up to about 120° C., step (c) is conducted at temperatures of about 20° to 160° C. and step (d) is conducted at temperatures of about 100° to 180° C.
References Cited (Backward Citations)
US2830037A
Cited
US3388087A
Cited
US3480592A
Cited
US3479310A
Cited
US3461103A
Cited
US3597495A
Cited
US3756992A
Cited
US3645775A
Cited
US3686108A
Cited
US4108814A
Cited
CA1129128A
Cited
US4192937A
Cited
US4269748A
Cited
US4308184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |