Patent US4442145A successfully refreshed from Google Patents.
US4442145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating substrates with polyisocyanates and polyhydroxy polyacrylates
Assignee: Bayer AG
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Filing: 1982-06-28
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Granted: 1984-04-10
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Expires: 2002-06-28
Abstract
Abstract The invention relates to a process for the production of coatings using a coating composition containing as binder optionally blocked lacquer-grade polyisocyanates in combination with polyhydroxy polyacrylate resins based on copolymers of certain hydroxy alkyl(meth)acrylates, methyl methacrylate, 2-ethylhexyl acrylate and, optionally, (meth)acrylic acid, wherein the molecular weight is in the range from about 30,000 to 80,000, the content of low molecular weight constituents having molecular weights of at most about 3000 amounts to between 3 and 15% by weight, the molecular heterogeneity factor amounts to between about 1.0 and 10.0, and the parameter for the chemical heterogeneity of the copolymer is between 0 and about 0.06.
Inventors
- 👤 Joachim Probst
- 👤 Bernd Riberi
- 👤 Gunter Kolb, deceased
- 👤 Peter Hohlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6216; C08G18/622; C08G18/6225; C08G18/6229
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
191 words
A process for the production of a coated substrate which comprises (A) coating said substrate with a coating composition which contains as binder a mixture comprising (a) a lacquer-grade polyisocyanate-containing biuret, urethane or isocyanurate groups and (b) a polyhydroxy polyacrylate resin based on a copolymer comprising (i) about 10 to 20 parts by weight of 2-hydroxyethyl(meth)-acrylate, 2- or 3-hydroxypropyl(meth)acrylate and/or hydroxybutyl(meth)acrylate, (ii) about 55 to 80 parts by weight of methyl methacrylate, (iii) about 8 to 30 parts by weight of 2-ethylhexyl acrylate and (iv) up to about 2 parts by weight of (meth)acrylic acid, wherein the polyhydroxy acrylate resin is further characterized by (1) an average molecular weight as determined by gel permeation chromatography, M GPC , of about 30,000 to 80,000, (2) about 3 to 15% by weight, based on the total weight of the copolymer, of low molecular weight constituents having molecular weights of at most about 3,000, (3) a molecular heterogeneity factor, U=Mw/Mn-1, of between about 1.0 and 10.0, and (4) a chemical heterogeneity parameter δ; for the copolymer of between 0 and about 0.06, and (B) hardening the coating composition to form a polyurethane coated substrate.
Claim 2
Dependent Claim
191 words
A process for the production of a coated substrate which comprises (A) coating said substrate with a coating composition which contains as binder a mixture comprising (a) a lacquer-grade polyisocyanate-containing biuret, urethane or isocyanurate groups and (b) a polyhydroxy polyacrylate resin based on a copolymer comprising (i) about 10 to 20 parts by weight of 2-hydroxyethyl(meth)-acrylate, 2- or 3-hydroxypropyl(meth)acrylate and/or hydroxybutyl(meth)acrylate, (ii) about 55 to 80 parts by weight of methyl methacrylate, (iii) about 8 to 30 parts by weight of 2-ethylhexyl acrylate and (iv) up to about 2 parts by weight of (meth)acrylic acid, wherein the polyhydroxy acrylate resin is further characterized by (1) an average molecular weight as determined by gel permeation chromatography, M GPC , of about 30,000 to 80,000, (2) about 3 to 15% by weight, based on the total weight of the copolymer, of low molecular weight constituents having molecular weights of at most about 3,000, (3) a molecular heterogeneity factor, U=Mw/Mn-1, of between about 1.0 and 10.0, and (4) a chemical heterogeneity parameter δ; for the copolymer of between 0 and about 0.06, and (B) hardening the coating composition to form a polyurethane coated substrate.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the equivalent ratio of the isocyanate groups of component (a) and the isocyanate-reactive groups of component (b) is between about 0.2:1 and 5:1.
Claim 4
Dependent Claim
66 words
The process of claim 1 wherein the polyhydroxy polyacrylate resin is based on a copolymer comprising (i) about 11 to 19 parts by weight of 2-hydroxyethyl(meth)acrylate, 2- or 3-hydroxypropyl (meth)acrylate and/or hydroxybutyl(meth)acrylate, (ii) about 60 to 75 parts by weight of methyl methacrylate, (iii) about 10 to 25 parts by weight of 2-ethylhexyl acrylate and (iv) about 0.5 to 1.5 parts by weight of (meth)acrylic acid.
Claim 5
Dependent Claim
92 words
The process of claim 1, 2 or 3 wherein the polyhydroxy acrylate resin is further characterized by (1) an average molecular weight as determined by gel permeation chromatography, M GPC , of about 40,000 to 70,000, (2) about 5 to 10% by weight, based on the total weight of the copolymer, of low molecular weight constituents having molecular weights of at most about 3,000, (3) a molecular heterogeneity factor, U=Mw/Mn-1, of between 2.0 and 6.0, and (4) a chemical heterogeneity parameter δ i for the copolymer of between about 0.01 and 0.05.
Claim 6
Dependent Claim
23 words
The process of claim 1, 2 or 3 wherein the isocyanate groups of component (a) are blocked with blocking agents for isocyanate groups.
Claim 7
Dependent Claim
20 words
The process of claim 4 wherein the isocyanate groups of component (a) are blocked with blocking agents for isocyanate groups.
Claim 8
Dependent Claim
13 words
The coated substrate prepared by the process of claim 1, 2 or 3.
Claim 9
Dependent Claim
10 words
The coated substrate prepared by the process of claim 4.
Claim 10
Dependent Claim
10 words
The coated substrate prepared by the process of claim 5.
Claim 11
Dependent Claim
10 words
The coated substrate prepared by the process of claim 6.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |